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/*
* Copyright (C) 2013-2025 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
* Copyright (C) 2007-2013 Sourcefire, Inc.
*
* Authors: Tomasz Kojm
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#ifndef __CLAMAV_H
#define __CLAMAV_H
#ifdef _WIN32
#ifndef OWN_WINSOCK
#include <winsock2.h>
#endif
#endif
#include <openssl/ssl.h>
#include <openssl/err.h>
/* Certain OSs already use 64bit variables in their stat struct */
#if (!defined(__FreeBSD__) && !defined(__APPLE__))
#define STAT64_OK 1
#else
#define STAT64_OK 0
#endif
#if defined(HAVE_STAT64) && STAT64_OK
#include <unistd.h>
#define STATBUF struct stat64
#define CLAMSTAT stat64
#define LSTAT lstat64
#define FSTAT fstat64
#define safe_open(a, b) open(a, b | O_LARGEFILE)
#else
#define STATBUF struct stat
#define CLAMSTAT stat
#define LSTAT lstat
#define FSTAT fstat
/* Nothing is safe in windows, not even open, safe_open defined under /win32 */
#ifndef _WIN32
#define safe_open open
#endif
#endif
/* Apple does not define __pid_t */
#ifdef __APPLE__
typedef pid_t __pid_t;
#endif
#define UNUSEDPARAM(x) (void)(x)
#include <sys/types.h>
#include <sys/stat.h>
#include <stdbool.h>
#include "clamav-types.h"
#include "clamav-version.h"
#ifdef __cplusplus
extern "C" {
#endif
#define CL_COUNT_PRECISION 4096
/**
* @brief Scan verdicts for cl_scanmap_ex(), cl_scanfile_ex(), and cl_scandesc_ex().
*/
typedef enum cl_verdict_t {
CL_VERDICT_NOTHING_FOUND = 0, /**< No alerting signatures matched. */
CL_VERDICT_TRUSTED, /**< The scan target has been deemed trusted (e.g. by FP signature or Authenticode). */
CL_VERDICT_STRONG_INDICATOR, /**< One or more strong indicator signatures matched. */
CL_VERDICT_POTENTIALLY_UNWANTED, /**< One or more potentially unwanted signatures matched. */
} cl_verdict_t;
/**
* @brief Return codes used by libclamav functions.
*/
typedef enum cl_error_t {
/* libclamav specific */
CL_CLEAN = 0,
CL_SUCCESS = 0,
CL_VIRUS,
CL_ENULLARG,
CL_EARG,
CL_EMALFDB,
CL_ECVD,
CL_EVERIFY,
CL_EUNPACK,
/* I/O and memory errors */
CL_EOPEN,
CL_ECREAT,
CL_EUNLINK,
CL_ESTAT,
CL_EREAD,
CL_ESEEK,
CL_EWRITE,
CL_EDUP,
CL_EACCES,
CL_ETMPFILE,
CL_ETMPDIR,
CL_EMAP,
CL_EMEM,
CL_ETIMEOUT,
/* internal (not reported outside libclamav) */
CL_BREAK,
CL_EMAXREC,
CL_EMAXSIZE,
CL_EMAXFILES,
CL_EFORMAT,
CL_EPARSE,
CL_EBYTECODE, /** may be reported in testmode */
CL_EBYTECODE_TESTFAIL, /** may be reported in testmode */
CL_ELOCK,
CL_EBUSY,
CL_ESTATE,
CL_VERIFIED, /** The scan target has been deemed trusted */
CL_ERROR, /** Unspecified / generic error */
/* no error codes below this line please */
CL_ELAST_ERROR
} cl_error_t;
/* db options */
// clang-format off
#define CL_DB_PHISHING 0x2
#define CL_DB_PHISHING_URLS 0x8
#define CL_DB_PUA 0x10
#define CL_DB_CVDNOTMP 0x20 /** @deprecated obsolete */
#define CL_DB_OFFICIAL 0x40 /** internal */
#define CL_DB_PUA_MODE 0x80
#define CL_DB_PUA_INCLUDE 0x100
#define CL_DB_PUA_EXCLUDE 0x200
#define CL_DB_COMPILED 0x400 /** internal */
#define CL_DB_DIRECTORY 0x800 /** internal */
#define CL_DB_OFFICIAL_ONLY 0x1000
#define CL_DB_BYTECODE 0x2000
#define CL_DB_SIGNED 0x4000 /** internal */
#define CL_DB_BYTECODE_UNSIGNED 0x8000 /** Caution: You should never run bytecode signatures from untrusted sources.
* Doing so may result in arbitrary code execution. */
#define CL_DB_UNSIGNED 0x10000 /** internal */
#define CL_DB_BYTECODE_STATS 0x20000
#define CL_DB_ENHANCED 0x40000
#define CL_DB_PCRE_STATS 0x80000
#define CL_DB_YARA_EXCLUDE 0x100000
#define CL_DB_YARA_ONLY 0x200000
#define CL_DB_FIPS_LIMITS 0x400000 /** Disable MD5 and SHA1 methods for trusting files and verifying certificates.
* Means: 1. CVD must be signed with external `.sign` file.
* 2. Disables support for `.fp` signatures. */
/* recommended db settings */
#define CL_DB_STDOPT (CL_DB_PHISHING | CL_DB_PHISHING_URLS | CL_DB_BYTECODE)
/*** scan options ***/
struct cl_scan_options {
uint32_t general;
uint32_t parse;
uint32_t heuristic;
uint32_t mail;
uint32_t dev;
};
/* general */
#define CL_SCAN_GENERAL_ALLMATCHES 0x1 /** scan in all-match mode */
#define CL_SCAN_GENERAL_COLLECT_METADATA 0x2 /** collect metadata (--gen-json) */
#define CL_SCAN_GENERAL_HEURISTICS 0x4 /** option to enable heuristic alerts */
#define CL_SCAN_GENERAL_HEURISTIC_PRECEDENCE 0x8 /** allow heuristic match to take precedence */
#define CL_SCAN_GENERAL_UNPRIVILEGED 0x10 /** scanner will not have read access to files */
#define CL_SCAN_GENERAL_STORE_HTML_URIS 0x20 /** when collect-metadata enabled: store uris found in html <a and <form tags */
#define CL_SCAN_GENERAL_STORE_PDF_URIS 0x40 /** when collect-metadata enabled: store uris found in pdf /URI tags */
#define CL_SCAN_GENERAL_STORE_EXTRA_HASHES 0x80 /** when collect-metadata enabled: calculate and store each type of supported file hash */
/* parsing capabilities options */
#define CL_SCAN_PARSE_ARCHIVE 0x1
#define CL_SCAN_PARSE_ELF 0x2
#define CL_SCAN_PARSE_PDF 0x4
#define CL_SCAN_PARSE_SWF 0x8
#define CL_SCAN_PARSE_HWP3 0x10
#define CL_SCAN_PARSE_XMLDOCS 0x20
#define CL_SCAN_PARSE_MAIL 0x40
#define CL_SCAN_PARSE_OLE2 0x80
#define CL_SCAN_PARSE_HTML 0x100
#define CL_SCAN_PARSE_PE 0x200
#define CL_SCAN_PARSE_ONENOTE 0x400
#define CL_SCAN_PARSE_IMAGE 0x800 /** option to enable/disable parsing images (graphics) */
#define CL_SCAN_PARSE_IMAGE_FUZZY_HASH 0x1000 /** option to enable/disable image fuzzy hash calculation. */
/* heuristic alerting options */
#define CL_SCAN_HEURISTIC_BROKEN 0x2 /** alert on broken PE and broken ELF files */
#define CL_SCAN_HEURISTIC_EXCEEDS_MAX 0x4 /** alert when files exceed scan limits (filesize, max scansize, or max recursion depth) */
#define CL_SCAN_HEURISTIC_PHISHING_SSL_MISMATCH 0x8 /** alert on SSL mismatches */
#define CL_SCAN_HEURISTIC_PHISHING_CLOAK 0x10 /** alert on cloaked URLs in emails */
#define CL_SCAN_HEURISTIC_MACROS 0x20 /** alert on OLE2 files containing macros */
#define CL_SCAN_HEURISTIC_ENCRYPTED_ARCHIVE 0x40 /** alert if archive is encrypted (rar, zip, etc) */
#define CL_SCAN_HEURISTIC_ENCRYPTED_DOC 0x80 /** alert if a document is encrypted (pdf, docx, etc) */
#define CL_SCAN_HEURISTIC_PARTITION_INTXN 0x100 /** alert if partition table size doesn't make sense */
#define CL_SCAN_HEURISTIC_STRUCTURED 0x200 /** data loss prevention options, i.e. alert when detecting personal information */
#define CL_SCAN_HEURISTIC_STRUCTURED_SSN_NORMAL 0x400 /** alert when detecting social security numbers */
#define CL_SCAN_HEURISTIC_STRUCTURED_SSN_STRIPPED 0x800 /** alert when detecting stripped social security numbers */
#define CL_SCAN_HEURISTIC_STRUCTURED_CC 0x1000 /** alert when detecting credit card numbers */
#define CL_SCAN_HEURISTIC_BROKEN_MEDIA 0x2000 /** alert if a file does not match the identified file format, works with JPEG, TIFF, GIF, PNG */
/* mail scanning options */
#define CL_SCAN_MAIL_PARTIAL_MESSAGE 0x1
/* dev options */
#define CL_SCAN_DEV_COLLECT_SHA 0x1 /** @deprecated (functionality removed) */
#define CL_SCAN_DEV_COLLECT_PERFORMANCE_INFO 0x2 /** collect performance timings */
/* cl_countsigs options */
#define CL_COUNTSIGS_OFFICIAL 0x1
#define CL_COUNTSIGS_UNOFFICIAL 0x2
#define CL_COUNTSIGS_ALL (CL_COUNTSIGS_OFFICIAL | CL_COUNTSIGS_UNOFFICIAL)
/* For the new engine_options bit field in the engine */
#define ENGINE_OPTIONS_NONE 0x0
#define ENGINE_OPTIONS_DISABLE_CACHE 0x1
#define ENGINE_OPTIONS_FORCE_TO_DISK 0x2
#define ENGINE_OPTIONS_DISABLE_PE_STATS 0x4
#define ENGINE_OPTIONS_DISABLE_PE_CERTS 0x8
#define ENGINE_OPTIONS_PE_DUMPCERTS 0x10
#define ENGINE_OPTIONS_TMPDIR_RECURSION 0x20
#define ENGINE_OPTIONS_FIPS_LIMITS 0x40
// clang-format on
struct cl_engine;
struct cl_settings;
/* ----------------------------------------------------------------------------
* Enable global libclamav features.
*/
/**
* @brief Enable debug messages
*/
extern void cl_debug(void);
/**
* @brief Set libclamav to always create section hashes for PE files.
*
* Section hashes are used in .mdb signature.
*/
extern void cl_always_gen_section_hash(void);
/* ----------------------------------------------------------------------------
* Scan engine functions.
*/
/**
* @brief This function initializes the openssl crypto system.
*
* Called by cl_init() and does not need to be cleaned up as de-init
* is handled automatically by openssl 1.0.2.h and 1.1.0
*
* @return Always returns 0
*/
int cl_initialize_crypto(void);
/**
* @brief Clean up ssl crypto inits.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Call to EVP_cleanup() has been removed since cleanup is now handled by
* auto-deinit as of openssl 1.0.2h and 1.1.0.
*/
void cl_cleanup_crypto(void);
#define CL_INIT_DEFAULT 0x0
/**
* @brief Initialize the ClamAV library.
*
* @param initoptions Unused.
* @return cl_error_t CL_SUCCESS if everything initialized correctly.
*/
extern cl_error_t cl_init(unsigned int initoptions);
/**
* @brief Allocate a new scanning engine and initialize default settings.
*
* The engine must be freed with `cl_engine_free()`.
*
* @return struct cl_engine* Pointer to the scanning engine.
*/
extern struct cl_engine *cl_engine_new(void);
enum cl_engine_field {
CL_ENGINE_MAX_SCANSIZE, /** uint64_t */
CL_ENGINE_MAX_FILESIZE, /** uint64_t */
CL_ENGINE_MAX_RECURSION, /** uint32_t */
CL_ENGINE_MAX_FILES, /** uint32_t */
CL_ENGINE_MIN_CC_COUNT, /** uint32_t */
CL_ENGINE_MIN_SSN_COUNT, /** uint32_t */
CL_ENGINE_PUA_CATEGORIES, /** (char *) */
CL_ENGINE_DB_OPTIONS, /** uint32_t */
CL_ENGINE_DB_VERSION, /** uint32_t */
CL_ENGINE_DB_TIME, /** time_t */
CL_ENGINE_AC_ONLY, /** uint32_t */
CL_ENGINE_AC_MINDEPTH, /** uint32_t */
CL_ENGINE_AC_MAXDEPTH, /** uint32_t */
CL_ENGINE_TMPDIR, /** (char *) */
CL_ENGINE_KEEPTMP, /** uint32_t */
CL_ENGINE_BYTECODE_SECURITY, /** uint32_t */
CL_ENGINE_BYTECODE_TIMEOUT, /** uint32_t */
CL_ENGINE_BYTECODE_MODE, /** uint32_t */
CL_ENGINE_MAX_EMBEDDEDPE, /** uint64_t */
CL_ENGINE_MAX_HTMLNORMALIZE, /** uint64_t */
CL_ENGINE_MAX_HTMLNOTAGS, /** uint64_t */
CL_ENGINE_MAX_SCRIPTNORMALIZE, /** uint64_t */
CL_ENGINE_MAX_ZIPTYPERCG, /** uint64_t */
CL_ENGINE_FORCETODISK, /** uint32_t */
CL_ENGINE_CACHE_SIZE, /** uint32_t */
CL_ENGINE_DISABLE_CACHE, /** uint32_t */
CL_ENGINE_DISABLE_PE_STATS, /** uint32_t */
CL_ENGINE_STATS_TIMEOUT, /** uint32_t */
CL_ENGINE_MAX_PARTITIONS, /** uint32_t */
CL_ENGINE_MAX_ICONSPE, /** uint32_t */
CL_ENGINE_MAX_RECHWP3, /** uint32_t */
CL_ENGINE_MAX_SCANTIME, /** uint32_t */
CL_ENGINE_PCRE_MATCH_LIMIT, /** uint64_t */
CL_ENGINE_PCRE_RECMATCH_LIMIT, /** uint64_t */
CL_ENGINE_PCRE_MAX_FILESIZE, /** uint64_t */
CL_ENGINE_DISABLE_PE_CERTS, /** uint32_t */
CL_ENGINE_PE_DUMPCERTS, /** uint32_t */
CL_ENGINE_CVDCERTSDIR, /** (char *) */
CL_ENGINE_TMPDIR_RECURSION, /** uint32_t */
CL_ENGINE_FIPS_LIMITS, /** uint32_t */
};
enum bytecode_security {
CL_BYTECODE_TRUST_ALL = 0, /** @deprecated obsolete */
CL_BYTECODE_TRUST_SIGNED, /** default */
CL_BYTECODE_TRUST_NOTHING /** paranoid setting */
};
enum bytecode_mode {
CL_BYTECODE_MODE_AUTO = 0, /** JIT if possible, fallback to interpreter */
CL_BYTECODE_MODE_JIT, /** force JIT */
CL_BYTECODE_MODE_INTERPRETER, /** force interpreter */
CL_BYTECODE_MODE_TEST, /** both JIT and interpreter, compare results, all failures are fatal */
CL_BYTECODE_MODE_OFF /** for query only, not settable */
};
struct cli_section_hash {
unsigned char md5[16];
size_t len;
};
typedef struct cli_stats_sections {
size_t nsections;
struct cli_section_hash *sections;
} stats_section_t;
/**
* @brief Set a numerical engine option.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine An initialized scan engine.
* @param cl_engine_field A CL_ENGINE option.
* @param num The new engine option value.
* @return cl_error_t CL_SUCCESS if successfully set.
* @return cl_error_t CL_EARG if the field number was incorrect.
* @return cl_error_t CL_ENULLARG null arguments were provided.
*/
extern cl_error_t cl_engine_set_num(struct cl_engine *engine, enum cl_engine_field field, long long num);
/**
* @brief Get a numerical engine option.
*
* @param engine An initialized scan engine.
* @param cl_engine_field A CL_ENGINE option.
* @param err (optional) A cl_error_t status code.
* @return long long The numerical option value.
*/
extern long long cl_engine_get_num(const struct cl_engine *engine, enum cl_engine_field field, int *err);
/**
* @brief Set a string engine option.
*
* If the string option has already been set, the existing string will be free'd
* and the new string will replace it.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine An initialized scan engine.
* @param cl_engine_field A CL_ENGINE option.
* @param str The new engine option value.
* @return cl_error_t CL_SUCCESS if successfully set.
* @return cl_error_t CL_EARG if the field number was incorrect.
* @return cl_error_t CL_EMEM if a memory allocation error occurred.
* @return cl_error_t CL_ENULLARG null arguments were provided.
*/
extern cl_error_t cl_engine_set_str(struct cl_engine *engine, enum cl_engine_field field, const char *str);
/**
* @brief Get a string engine option.
*
* @param engine An initialized scan engine.
* @param cl_engine_field A CL_ENGINE option.
* @param err (optional) A cl_error_t status code.
* @return const char * The string option value.
*/
extern const char *cl_engine_get_str(const struct cl_engine *engine, enum cl_engine_field field, int *err);
/**
* @brief Copy the settings from an existing scan engine.
*
* The cl_settings pointer is allocated and must be freed with cl_engine_settings_free().
*
* @param engine An configured scan engine.
* @return struct cl_settings* The settings.
*/
extern struct cl_settings *cl_engine_settings_copy(const struct cl_engine *engine);
/**
* @brief Apply settings from a settings structure to a scan engine.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine A scan engine.
* @param settings The settings.
* @return cl_error_t CL_SUCCESS if successful.
* @return cl_error_t CL_EMEM if a memory allocation error occurred.
*/
extern cl_error_t cl_engine_settings_apply(struct cl_engine *engine, const struct cl_settings *settings);
/**
* @brief Free a settings struct pointer.
*
* @param settings The settings struct pointer.
* @return cl_error_t CL_SUCCESS if successful.
* @return cl_error_t CL_ENULLARG null arguments were provided.
*/
extern cl_error_t cl_engine_settings_free(struct cl_settings *settings);
/**
* @brief Prepare the scanning engine.
*
* Call this after all required databases have been loaded and settings have
* been applied.
*
* @param engine A scan engine.
* @return cl_error_t CL_SUCCESS if successful.
* @return cl_error_t CL_ENULLARG null arguments were provided.
*/
extern cl_error_t cl_engine_compile(struct cl_engine *engine);
/**
* @brief Add a reference count to the engine.
*
* Thread safety mechanism so that the engine is not free'd by another thread.
*
* The engine is initialized with refcount = 1, so this only needs to be called
* for additional scanning threads.
*
* @param engine A scan engine.
* @return cl_error_t CL_SUCCESS if successful.
* @return cl_error_t CL_ENULLARG null arguments were provided.
*/
extern cl_error_t cl_engine_addref(struct cl_engine *engine);
/**
* @brief Free an engine.
*
* Will lower the reference count on an engine. If the reference count hits
* zero, the engine will be freed.
*
* @param engine A scan engine.
* @return cl_error_t CL_SUCCESS if successful.
* @return cl_error_t CL_ENULLARG null arguments were provided.
*/
extern cl_error_t cl_engine_free(struct cl_engine *engine);
/* ----------------------------------------------------------------------------
* ClamAV File Map Abstraction Public API.
*/
struct cl_fmap;
typedef struct cl_fmap cl_fmap_t;
/**
* @brief Read callback function type.
*
* A callback function pointer type for reading data from a cl_fmap_t that uses
* reads data from a handle interface.
*
* Read 'count' bytes starting at 'offset' into the buffer 'buf'
*
* Thread safety: It is guaranteed that only one callback is executing for a
* specific handle at any time, but there might be multiple callbacks executing
* for different handle at the same time.
*
* @param handle The handle passed to cl_fmap_open_handle, its meaning is up
* to the callback's implementation
* @param buf A buffer to read data into, must be at least offset + count
* bytes in size.
* @param count The number of bytes to read.
* @param offset The offset into buf to read the data to. If successful,
* the number of bytes actually read is returned. Upon reading
* end-of-file, zero is returned. Otherwise, a -1 is returned
* and the global variable errno is set to indicate the error.
*/
typedef off_t (*clcb_pread)(void *handle, void *buf, size_t count, off_t offset);
/**
* @brief Open a map given a handle.
*
* Open a map for scanning custom data accessed by a handle and pread (lseek +
* read)-like interface. For example a file descriptor or a WIN32 HANDLE.
* By default fmap will use aging to discard old data, unless you tell it not
* to.
*
* The handle will be passed to the callback each time.
*
* TIP: Check the size limits before calling this function so you don't map a
* file that is larger than the maximum size the engine is configured to scan.
*
* Note that the offset and len is for the start through the end of an _entire_
* file, which may be contained within another larger file.
* You can't give it parts of a file and expect detection to work.
*
* @param handle A handle that may be accessed using lseek + read.
* @param offset Initial offset to start scanning.
* @param len Length of the data from the start (not the offset).
* @param pread_cb A callback function to read data from the handle.
* @param use_aging Set to a non-zero value to enable aging.
* @return cl_fmap_t* A map representing the handle interface.
*/
extern cl_fmap_t *cl_fmap_open_handle(
void *handle,
size_t offset,
size_t len,
clcb_pread pread_cb,
int use_aging);
/**
* @brief Open a map given a buffer.
*
* Open a map for scanning custom data, where the data is already in memory,
* either in the form of a buffer, a memory mapped file, etc.
*
* Note that the memory [start, start+len) must be the _entire_ file,
* you can't give it parts of a file and expect detection to work.
*
* @param start Pointer to a buffer of data.
* @param len Length in bytes of the data.
* @return cl_fmap_t* A map representing the buffer.
*/
extern cl_fmap_t *cl_fmap_open_memory(const void *start, size_t len);
/**
* @brief Set the utf8 name of a file map. E.g. "invoice.exe"
*
* The name is used for debugging and logging purposes.
* In a future release, the file extension may help determine refine file type
* detection. E.g. ".js" may indicate that something previously identified as
* a text file is more specifically a JavaScript file.
* That is - at this time setting the name will have no impact on detection,
* but it may in the future.
*
* @param map The file map to modify.
* @param name The new name for the file map.
* @return cl_error_t CL_SUCCESS if the name was set successfully.
*/
extern cl_error_t cl_fmap_set_name(cl_fmap_t *map, const char *name);
/**
* @brief Get the utf8 name of a file map.
*
* The name is used for debugging and logging purposes.
*
* @param map The file map to query.
* @param[out] name_out Pointer to a variable to receive the name of the file map.
* @return const char* The name of the file map, or NULL if not set.
*/
extern cl_error_t cl_fmap_get_name(cl_fmap_t *map, const char **name_out);
/**
* @brief Set the utf8 path of a file map. E.g. "/tmp/invoice.exe"
*
* This is used to set the actual file path of the mapped map.
* The path may be used for debugging or logging purposes.
*
* You might want to set the path if you opened the map with `cl_fmap_open_handle()`.
*
* @param map The file map to modify.
* @param path The new path for the file map.
* @return cl_error_t CL_SUCCESS if the path was set successfully.
*/
extern cl_error_t cl_fmap_set_path(cl_fmap_t *map, const char *path);
/**
* @brief Get the utf8 path of a file map.
*
* The path is used for debugging and logging purposes.
*
* This may be NULL even if there is a file descriptor associated with the map.
* There is no guarantee that the path was set by whomever created the map.
* For example, if the map was created from a file descriptor that was provided
* to clamd by clamonacc or clamdscan using fd-passing, then the path may not be
* known.
*
* This of course will be NULL if the map was created from a memory buffer.
*
* If you need a temp file for each file extracted, you can use ClamAV's
* force-to-disk feature. Note: There is no option to force-to-memory.
* Many of the parser modules will create temporary files no matter what.
*
* If the fmap represents a temp file created during the scan, then unless you
* use CL_ENGINE_KEEPTMP, it will be deleted when the scan is done with this
* layer.
*
* @param map The file map to query.
* @param[out] path_out Pointer to a variable to receive the path of the file map.
* @param[out] offset_out (optional) Pointer to a variable to receive the offset of the current layer within the given file.
* @param[out] len_out (optional) Pointer to a variable to receive the length of the current layer within the given file.
* @return cl_error_t CL_SUCCESS if the path was successfully retrieved.
* CL_EACCES if the map does not have a file descriptor.
* CL_ENULLARG if null arguments were provided.
*/
extern cl_error_t cl_fmap_get_path(cl_fmap_t *map, const char **path_out, size_t *offset_out, size_t *len_out);
/**
* @brief Get the file descriptor of a file map.
*
* The file descriptor is used to access the file represented by the file map.
* If the file map was created from a file descriptor, this will return that
* descriptor. Otherwise, it will return -1.
*
* If you need a temp file for each file extracted, you can use ClamAV's
* force-to-disk feature. Note: There is no option to force-to-memory.
* Many of the parser modules will create temporary files no matter what.
*
* Don't close this file descriptor. Don't dup it either.
*
* @param map The file map to query.
* @param[out] fd_out Pointer to a variable to receive the file descriptor.
* @param[out] offset_out (optional) Pointer to a variable to receive the offset of the current layer within the given file.
* @param[out] len_out (optional) Pointer to a variable to receive the length of the current layer within the given file.
* @return cl_error_t CL_SUCCESS if the file descriptor was successfully retrieved.
* CL_EACCES if the map does not have a file descriptor.
* CL_ENULLARG if null arguments were provided.
*/
extern cl_error_t cl_fmap_get_fd(const cl_fmap_t *map, int *fd_out, size_t *offset_out, size_t *len_out);
/**
* @brief Get the file size of the current layer from a file map.
*
* This function retrieves the size of the file represented by the file map.
* If the file map was created from a handle, it will use the pread callback
* to determine the size.
*
* @param map The file map to query.
* @param[out] size_out Pointer to a variable to receive the size of the file.
* @return cl_error_t CL_SUCCESS if the file size was successfully retrieved.
*/
extern cl_error_t cl_fmap_get_size(const cl_fmap_t *map, size_t *size_out);
/**
* @brief Set the file hash for a file map.
*
* This function sets the hash of the file represented by the file map.
* If a hash of the requested type has already been calculated, it will be
* overwritten with the new value.
*
* @param map The file map to modify.
* @param hash_alg The hash algorithm to use (e.g., "md5", "sha1", "sha2-256").
* @param hash The hash value to set.
* @return cl_error_t CL_SUCCESS if the hash was successfully set.
*/
extern cl_error_t cl_fmap_set_hash(const cl_fmap_t *map, const char *hash_alg, char hash);
/**
* @brief Check if we already calculated a file hash of a specific type.
*
* This function checks if the file represented by the file map has a hash
* of the requested type already calculated.
*
* @param map A file map.
* @param hash_alg The hash algorithm to check (e.g., "md5", "sha1", "sha2-256").
* @param[out] have_hash_out Pointer to a boolean that will be set to true if the hash exists, false otherwise.
* @return cl_error_t CL_SUCCESS if the check was successful.
*/
extern cl_error_t cl_fmap_have_hash(const cl_fmap_t *map, const char *hash_alg, bool *have_hash_out);
/**
* @brief Indicate that we will need a file hash of a specific type later.
*
* This function indicates that we will need the file hash of the requested
* type in the future. The next time a hash is calculated, (e.g. when you run
* `cl_fmap_get_hash()`, it will also calculate the requested hash type.
*
* This is an optimization to avoid iterating over the file contents multiple times
* which might happen if you call `cl_fmap_get_hash()` without calling this first.
*
* @param map A file map.
* @param hash_alg The hash algorithm to indicate (e.g., "md5", "sha1", "sha2-256").
* @return cl_error_t CL_SUCCESS if the indication was successful.
*/
extern cl_error_t cl_fmap_will_need_hash_later(const cl_fmap_t *map, const char *hash_alg);
/**
* @brief Get the file hash from a file map.
*
* This function retrieves the hash of the file represented by the file map.
* If a hash of the requested type has NOT already been calculated then it will
* be calculated when you call this function, and stored for future use.
*
* You are responsible for freeing the hash string when you're done with it.
*
* @param map A file map.
* @param hash_alg The hash algorithm to use (e.g., "md5", "sha1", "sha2-256").
* @param[out] hash_out Malloced string containing the hash value.
* @return cl_error_t CL_SUCCESS if the hash was successfully retrieved.
*/
extern cl_error_t cl_fmap_get_hash(const cl_fmap_t *map, const char *hash_alg, char **hash_out);
/**
* @brief Get the file contents from a file map.
*
* This function will get you a pointer to the contents of the file represented
* by the file map. This is read-only and is not malloced.
* If you want a copy to keep, you must copy it yourself.
*
* Use the offset and length parameters to specify the range of the file you
* want to retrieve. If you don't need the whole file, don't ask for the whole file.
*
* @param map A file map.
* @param offset The offset in the file from which to access.
* @param len The length of the data to read.
* If 0, then the rest of the file will be provided.
* @param[out] data_out A valid pointer to data file contents. Will be NULL if failed.
* @param[out] data_len_out The length of the file contents. May be less than requested if the end of file is reached.
* @return cl_error_t CL_SUCCESS if the contents were successfully retrieved.
*/
extern cl_error_t cl_fmap_get_data(
const cl_fmap_t *map,
size_t offset,
size_t len,
const uint8_t **data_out,
size_t *data_len_out);
/**
* @brief Releases resources associated with the map.
*
* You must release any resources you hold only after (handles, maps) calling
* this function.
*
* @param map Map to be closed.
*/
extern void cl_fmap_close(cl_fmap_t *);
/* ----------------------------------------------------------------------------
* ClamAV Recursive Scan Layer Public API.
*/
struct cl_scan_layer;
typedef struct cl_scan_layer cl_scan_layer_t;
/**
* @brief Get the file map associated with a scan layer.
*
* @param layer The scan layer to query.
* @param[out] fmap_out Pointer to a variable to receive the file map.
* @return cl_error_t CL_SUCCESS if successful.
*/
extern cl_error_t cl_scan_layer_get_fmap(
cl_scan_layer_t *layer,
cl_fmap_t **fmap_out);
/**
* @brief Get the parent layer of a scan layer.
*
* You may use this in a loop/recursively to walk the scan layers.
* Also consider using `cl_scan_layer_get_recursion_level()` to determine the
* depth of the current layer.
*
* @param layer The scan layer to query.
* @param[out] parent_layer_out Pointer to a variable to receive the parent layer.
* Will be NULL if the layer has no parent.
* For example, the root layer has no parent.
* @return cl_error_t CL_SUCCESS if successful.
*/
extern cl_error_t cl_scan_layer_get_parent_layer(
cl_scan_layer_t *layer,
cl_scan_layer_t **parent_layer_out);
/**
* @brief Get the file type of a scan layer.
*
* The file type as clamav currently believes it to be.
* It may change later in the scan, so consider using `clcb_file_type_correction`
* callback to access the file again if it is re-typed.
*
* @param layer The scan layer to query.
* @param[out] type_out Pointer to a variable to receive the file type.
* This is a static reference and must not be freed.
* @return cl_error_t CL_SUCCESS if successful.
*/
extern cl_error_t cl_scan_layer_get_type(
cl_scan_layer_t *layer,
const char **type_out);
/**
* @brief Get the recursion level of a scan layer.
*
* @param layer The scan layer to query.
* @param[out] recursion_level_out Pointer to a variable to receive the recursion level.
* @return cl_error_t CL_SUCCESS if successful.
*/
extern cl_error_t cl_scan_layer_get_recursion_level(
cl_scan_layer_t *layer,
uint32_t *recursion_level_out);
/**
* @brief Get the object ID of a scan layer.
*
* Object ID is a unique identifier for the scan layer. It counts up from 0, although the callback interface
* may skip some IDs if the scan layer is processed immediately rather than being handled as distinct file type.
* For example, HTML may be normalized several ways and they're each given an Object ID, but we immediately
* pattern match them and do not handle them as distinct file types that were contained within the HTML.
*
* @param layer The scan layer to query.
* @param[out] object_id_out Pointer to a variable to receive the object ID.
* @return cl_error_t CL_SUCCESS if successful.
*/
extern cl_error_t cl_scan_layer_get_object_id(
cl_scan_layer_t *layer,
uint64_t *object_id_out);
/**
* @brief Get the last detected alert name from a scan layer.
*
* Do not free the alert name, and make a copy if you need one.
*
* @param layer The scan layer to query.
* @param[out] alert_name_out Pointer to a variable to receive the alert name.
* If the layer has no alerts, this will be set to NULL.
* @return cl_error_t CL_SUCCESS if successful.
*/
extern cl_error_t cl_scan_layer_get_last_alert(
cl_scan_layer_t *layer,
const char **alert_name_out);
/*
* Attributes of each layer in scan.
*/
#define LAYER_ATTRIBUTES_NONE 0x0 /**< No attributes set. */
#define LAYER_ATTRIBUTES_NORMALIZED 0x1 /**< This layer was modified to make matching more generic, reliable. */
#define LAYER_ATTRIBUTES_DECRYPTED 0x2 /**< Decryption was used to extract this layer. \
* E.g. ClamAV was able to decrypt an encrypted file entry in the parent layer. */
#define LAYER_ATTRIBUTES_RETYPED 0x4 /**< This layer is a re-scan of the parent layer but as a new type (e.g. using HandlerType). */
#define LAYER_ATTRIBUTES_EMBEDDED 0x8 /**< This layer was found within the parent layer using FTM signatures \
* (e.g. like ZIP entries found within an executable). */
/**
* @brief Get the attributes of a scan layer.
*
* @param layer The scan layer to query.
* @param[out] attributes_out Pointer to a variable to receive the layer attributes.
* @return cl_error_t CL_SUCCESS if successful.
*/
extern cl_error_t cl_scan_layer_get_attributes(
cl_scan_layer_t *layer,
uint32_t *attributes_out);
/* ----------------------------------------------------------------------------
* Callback function type definitions.
*/
typedef enum scan_callback {
/** Pre-hash
*
* Occurs just after basic file-type detection and before any hashes have been calculated either for the cache or
* the gen-json metadata.
* If you want any hashes other than SHA2-256, the most efficient option is to run the
* `cl_fmap_will_need_hash_later()` function in this callback for each and then run the `cl_fmap_get_hash()`
* function afterwards (now or later) to gather the hashes.
*
* Using this callback will appear in-order for ClamAV's depth-first approach.
*/
CL_SCAN_CALLBACK_PRE_HASH,
/** Pre-scan
*
* Occurs before parser modules run and before pattern matching.
*
* Using this callback will appear in-order for ClamAV's depth-first approach.
*/
CL_SCAN_CALLBACK_PRE_SCAN,
/** Post-scan
*
* Occurs after pattern matching and after running parser modules (i.e. scan complete for this layer).
* This callback is useful for post-processing the results of the scan, but is the most likely of the callbacks to
* be skipped if something goes critically wrong or the hash for the layer appeared in the clean-cache.
*
* Using this callback will appear in REVERSE-order for ClamAV's depth-first approach.
*/
CL_SCAN_CALLBACK_POST_SCAN,
/** Alert
*
* Occurs each time an alert (detection) would be triggered during a scan.
* In all-match mode, you may receive multiple alerts for the same file, and even the same layer, corresponding with
* each signature that matched.
*/
CL_SCAN_CALLBACK_ALERT,
/** File type
*
* Occurs each time the file type determination is refined.
* This may happen more than once per LAYER!
*
* Outside of using this callback, The most accurate time to check the file type would be:
* - For each layer: Use `cl_scan_layer_get_type()` in the `CL_SCAN_CALLBACK_POST_SCAN` callback.
* - For just the top layer: Use the `file_type_out` parameter provided by the `cl_scan*ex()` functions.
*/
CL_SCAN_CALLBACK_FILE_TYPE
} cl_scan_callback_t;
/**
* @brief Callback interface to get access to the current layer using the scan-
* layer abstraction. This grants access to file content and attributes as well
* as those of each ancestor layers (if any).
*
* Called for each processed file including both the top level file (i.e. the
* zeroeth layer) and all contained files (recursively).
*
* @param layer Scan layer (abstraction) for the current layer being scanned.
* Use the `cl_scan_layer_*` functions to access layer data and metadata.
* You may want to use `cl_scan_layer_get_fmap()` to get the file map for the current layer.
* You may also use it to access ancestor layers using `cl_scan_layer_get_parent_layer()`.
*
* @param context The application context pointer passed in to the `cl_scan*()` function.
*
* @return CL_BREAK
*
* Scan aborted by callback (the rest of the scan is skipped).
* This does not mark the file as clean or infected, it just skips the rest of the scan.
*
* @return CL_SUCCESS
*
* File scan will continue.
*
* For CL_SCAN_CALLBACK_ALERT: Means you want to ignore this specific alert and keep scanning.
* This is different than CL_VERIFIED because it does not affect prior or future alerts.
* Return CL_VERIFIED instead if you want to remove prior alerts for this layer and skip
* the rest of the scan for this layer.
*
* @return CL_VIRUS
*
* This will mark the file as infected. A new alert will be added.
*
* For CL_SCAN_CALLBACK_ALERT: Means you agree with the alert (no extra alert needed).
* Remember that CL_SUCCESS means you want to ignore the alert.
*
* @return CL_VERIFIED
*
* Layer explicitly trusted by the callback and previous alerts removed FOR THIS layer.
* You might want to do this if you trust the hash or verified a digital signature.
* The rest of the scan will be skipped FOR THIS layer.
* For contained files, this does NOT mean that the parent or adjacent layers are trusted.
*/
typedef cl_error_t (*clcb_scan)(cl_scan_layer_t *layer, void *context);
/**
* @brief Set a callback function using the clcb_scan callback type.
*
* Select the callback location using the `cl_scan_callback_t` enum.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
* @param location The location of the callback.
*/
extern void cl_engine_set_scan_callback(struct cl_engine *engine, clcb_scan callback, cl_scan_callback_t location);
/**
* @brief Pre-cache callback.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `CL_SCAN_CALLBACK_PRE_HASH` with `cl_engine_set_scan_callback()` instead.
*
* Called for each processed file (both the entry level - AKA 'outer' - file and
* inner files - those generated when processing archive and container files), before
* the actual scanning takes place.
*
* @param fd File descriptor which is about to be scanned.
* @param type File type detected via magic - i.e. NOT on the fly - (e.g. "CL_TYPE_MSEXE").
* @param context Opaque application provided data.
* @return CL_SUCCESS = File is scanned.
* @return CL_BREAK = Allowed by callback - file is skipped and marked as clean.
* @return CL_VIRUS = Blocked by callback - file is skipped and marked as infected.
*/
typedef cl_error_t (*clcb_pre_cache)(int fd, const char *type, void *context);
/**
* @brief Set a custom pre-cache callback function.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `CL_SCAN_CALLBACK_PRE_HASH` with `cl_engine_set_scan_callback()` instead.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_pre_cache(struct cl_engine *engine, clcb_pre_cache callback);
/**
* @brief File inspection callback.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `CL_SCAN_CALLBACK_PRE_SCAN` with `cl_engine_set_scan_callback()` instead.
*
* You can use the `cl_fmap_*` functions to access the file map, file name, file size, file contents,
* and those of each ancestor layers (if any).
*
* Called for each NEW file (inner and outer).
* Provides capability to record embedded file information during a scan.
*
* @param fd Current file descriptor which is about to be scanned.
* @param type Current file type detected via magic - i.e. NOT on the fly - (e.g. "CL_TYPE_MSEXE").
* @param ancestors An array of ancestors filenames of size `recursion_level`. filenames may be NULL.
* @param parent_file_size Parent file size.
* @param file_name Current file name, or NULL if the file does not have a name or ClamAV failed to record the name.
* @param file_size Current file size.
* @param file_buffer Current file buffer pointer.
* @param recursion_level Recursion level / depth of the current file.
* @param layer_attributes See LAYER_ATTRIBUTES_* flags.
* @param context Opaque application provided data.
* @return CL_SUCCESS = File is scanned.
* @return CL_BREAK = Whitelisted by callback - file is skipped and marked as clean.
* @return CL_VIRUS = Blacklisted by callback - file is skipped and marked as infected.
*/
typedef cl_error_t (*clcb_file_inspection)(
int fd,
const char *type,
const char **ancestors,
size_t parent_file_size,
const char *file_name,
size_t file_size,
const char *file_buffer,
uint32_t recursion_level,
uint32_t layer_attributes,
void *context);
/**
* @brief Set a custom file inspection callback function.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `CL_SCAN_CALLBACK_PRE_SCAN` with `cl_engine_set_scan_callback()` instead.
*
* DISCLAIMER: This interface is to be considered unstable while we continue to evaluate it.
* We may change this interface in the future.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_file_inspection(struct cl_engine *engine, clcb_file_inspection callback);
/**
* @brief Pre-scan callback.
*
* @deprecated This function is deprecated and will be removed in a future release.
*
* Called for each NEW file (inner and outer) before the scanning takes place. This is
* roughly the same as clcb_before_cache, but it is affected by clean file caching.
* This means that it won't be called if a clean cached file (inner or outer) is
* scanned a second time.
*
* @param fd File descriptor which is about to be scanned.
* @param type File type detected via magic - i.e. NOT on the fly - (e.g. "CL_TYPE_MSEXE").
* @param context Opaque application provided data.
* @return CL_SUCCESS = File is scanned.
* @return CL_BREAK = Allowed by callback - file is skipped and marked as clean.
* @return CL_VIRUS = Blocked by callback - file is skipped and marked as infected.
*/
typedef cl_error_t (*clcb_pre_scan)(int fd, const char *type, void *context);
/**
* @brief Set a custom pre-scan callback function.
* Use `CL_SCAN_CALLBACK_PRE_SCAN` with `cl_engine_set_scan_callback()` instead.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_pre_scan(struct cl_engine *engine, clcb_pre_scan callback);
/**
* @brief Post-scan callback.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `CL_SCAN_CALLBACK_PRE_SCAN` with `cl_engine_set_scan_callback()` instead.
*
* Called for each processed file (inner and outer), after the scanning is complete.
* In all-match mode, the virname will be one of the matches, but there is no
* guarantee in which order the matches will occur, thus the final virname may
* be any one of the matches.
*
* @param fd File descriptor which was scanned.
* @param result The scan result for the file.
* @param virname A signature name if there was one or more matches.
* @param context Opaque application provided data.
* @return CL_SUCCESS = File is scanned.
* @return CL_BREAK = Allowed by callback - file is skipped and marked as clean.
* @return CL_VIRUS = Blocked by callback - file is skipped and marked as infected.
*/
typedef cl_error_t (*clcb_post_scan)(int fd, int result, const char *virname, void *context);
/**
* @brief Set a custom post-scan callback function.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_post_scan(struct cl_engine *engine, clcb_post_scan callback);
/**
* @brief Virus-found callback.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `CL_SCAN_CALLBACK_ALERT` with `cl_engine_set_scan_callback()` instead.
*
* Called for each signature match.
* If all-match is enabled, clcb_virus_found() may be called multiple times per
* scan.
*
* In addition, clcb_virus_found() does not have a return value and thus.
* can not be used to ignore the match.
*
* @param fd File descriptor which was scanned.
* @param virname Virus name.
* @param context Opaque application provided data.
*/
typedef void (*clcb_virus_found)(int fd, const char *virname, void *context);
/**
* @brief Set a custom virus-found callback function.
* Use `CL_SCAN_CALLBACK_ALERT` with `cl_engine_set_scan_callback()` instead.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_virus_found(struct cl_engine *engine, clcb_virus_found callback);
/**
* @brief Signature-load callback.
*
* May be used to ignore signatures at database load time.
*
* WARNING: Some signatures (notably ldb, cbc) can be dependent upon other signatures.
* Failure to preserve dependency chains will result in database loading failure.
* It is the implementor's responsibility to guarantee consistency.
*
* @param type The signature type (e.g. "db", "ndb", "mdb", etc.)
* @param name Signature name.
* @param custom The signature is official (custom == 0) or custom (custom != 0)
* @param context Opaque application provided data
* @return 0 to load the current signature.
* @return Non-0 to skip the current signature.
*/
typedef int (*clcb_sigload)(const char *type, const char *name, unsigned int custom, void *context);
/**
* @brief Set a custom signature-load callback function.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
* @param context Opaque application provided data.
*/
extern void cl_engine_set_clcb_sigload(struct cl_engine *engine, clcb_sigload callback, void *context);
enum cl_msg {
/* leave room for more message levels in the future */
CL_MSG_INFO_VERBOSE = 32, /* verbose */
CL_MSG_WARN = 64, /* LibClamAV WARNING: */
CL_MSG_ERROR = 128 /* LibClamAV ERROR: */
};
/**
* @brief Progress callback for sig-load, engine-compile, and engine-free.
*
* Progress is complete when total_items == now_completed.
*
* Note: The callback should return CL_SUCCESS. We reserve the right to have it
* cancel the operation in the future if you return something else...
* ... but for now, the return value will be ignored.
*
* @param total_items Total number of items
* @param now_completed Number of items completed
* @param context Opaque application provided data
* @return cl_error_t reserved for future use
*/
typedef cl_error_t (*clcb_progress)(size_t total_items, size_t now_completed, void *context);
/**
* @brief Set a progress callback function to be called incrementally during a
* database load.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine
* @param callback The callback function pointer
* @param context Opaque application provided data
*/
extern void cl_engine_set_clcb_sigload_progress(struct cl_engine *engine, clcb_progress callback, void *context);
/**
* @brief Set a progress callback function to be called incrementally during an
* engine compile.
*
* Disclaimer: the number of items for this is a rough estimate of the items that
* tend to take longest to compile and doesn't represent an accurate number of
* things compiled.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine
* @param callback The callback function pointer
* @param context Opaque application provided data
*/
extern void cl_engine_set_clcb_engine_compile_progress(struct cl_engine *engine, clcb_progress callback, void *context);
/**
* @brief Set a progress callback function to be called incrementally during an
* engine free (if the engine is in fact freed).
*
* Disclaimer: the number of items for this is a rough estimate of the items that
* tend to take longest to free and doesn't represent an accurate number of
* things freed.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine
* @param callback The callback function pointer
* @param context Opaque application provided data
*/
extern void cl_engine_set_clcb_engine_free_progress(struct cl_engine *engine, clcb_progress callback, void *context);
/**
* @brief Logging message callback for info, warning, and error messages.
*
* The specified callback will be called instead of logging to stderr.
* Messages of lower severity than specified are logged as usual.
*
* Callback may be used to silence logging by assigning a do-nothing function.
* Does not affect debug log messages.
*
* Just like with cl_debug() this must be called before going multithreaded.
* Callable before cl_init, if you want to log messages from cl_init() itself.
*
* You can use context of cl_scandesc_callback to convey more information to
* the callback (such as the filename!).
*
* Note: setting a 2nd callbacks overwrites previous, multiple callbacks are not
* supported.
*
* @param severity Message severity (CL_MSG_INFO_VERBOSE, CL_MSG_WARN, or CL_MSG_ERROR).
* @param fullmsg The log message including the "LibClamAV <severity>: " prefix.
* @param msg The log message.
* @param context Opaque application provided data.
*/
typedef void (*clcb_msg)(enum cl_msg severity, const char *fullmsg, const char *msg, void *context);
/**
* @brief Set a custom logging message callback function for all of libclamav.
*
* @param callback The callback function pointer.
*/
extern void cl_set_clcb_msg(clcb_msg callback);
/**
* @brief LibClamAV hash stats callback.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `CL_SCAN_CALLBACK_ALERT` with `cl_engine_set_scan_callback()` instead.
* Then use the `cl_scan_layer_get_fmap()` and `cl_fmap_get_hash()` functions.
*
* Callback that provides the hash of a scanned sample if a signature alerted.
* Provides a mechanism to record detection statistics.
*
* @param fd File descriptor if available, else -1.
* @param size Sample size
* @param md5 Sample md5 hash (string)
* @param virname Signature name that the sample matched against
* @param context Opaque application provided data
*/
typedef void (*clcb_hash)(int fd, unsigned long long size, const char *md5, const char *virname, void *context);
/**
* @brief Set a custom hash stats callback function.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `CL_SCAN_CALLBACK_ALERT` with `cl_engine_set_scan_callback()` instead.
* Then use the `cl_scan_layer_get_fmap()` and `cl_fmap_get_hash()` functions.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_hash(struct cl_engine *engine, clcb_hash callback);
/**
* @brief Archive meta matching callback function.
*
* May be used to block archive/container samples based on archive metadata.
* Function is invoked multiple times per archive. Typically once per contained file.
*
* Note: Used by the --archive-verbose clamscan option. Overriding this will alter
* the output from --archive-verbose.
*
* @param container_type String name of type (CL_TYPE).
* @param fsize_container Sample size
* @param filename Filename associated with the data in archive.
* @param fsize_real Size of file after decompression (according to the archive).
* @param is_encrypted Boolean non-zero if the contained file is encrypted.
* @param filepos_container File index in container.
* @param context Opaque application provided data.
* @return CL_VIRUS to block (alert on)
* @return CL_SUCCESS to continue scanning
*/
typedef cl_error_t (*clcb_meta)(
const char *container_type,
unsigned long fsize_container,
const char *filename,
unsigned long fsize_real,
int is_encrypted,
unsigned int filepos_container,
void *context);
/**
* @brief Set a custom archive metadata matching callback function.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_meta(struct cl_engine *engine, clcb_meta callback);
/**
* @brief File properties callback function.
*
* Invoked after a scan the CL_SCAN_GENERAL_COLLECT_METADATA general scan option
* is enabled and libclamav was built with json support.
*
* @param j_propstr File properties/metadata in a JSON encoded string.
* @param rc The cl_error_t return code from the scan.
* @param cbdata Opaque application provided data.
*/
typedef int (*clcb_file_props)(const char *j_propstr, int rc, void *cbdata);
/**
* @brief Set a custom file properties callback function.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_file_props(struct cl_engine *engine, clcb_file_props callback);
/**
* @brief generic data callback function.
*
* Callback handler prototype for callbacks passing back data and application context.
*
* @param data A pointer to some data. Should be treated as read-only and may be freed after callback.
* @param data_len The length of data.
* @param cbdata Opaque application provided data.
*/
typedef int (*clcb_generic_data)(const unsigned char *const data, const size_t data_len, void *cbdata);
/**
* @brief Set a custom VBA macro callback function.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_vba(struct cl_engine *engine, clcb_generic_data callback);
/* ----------------------------------------------------------------------------
* Statistics/telemetry gathering callbacks.
*
* The statistics callback functions may be used to implement a telemetry
* gathering feature.
*
* The structure definition for `cbdata` is entirely up to the caller, as are
* the implementations of each of the callback functions defined below.
*/
/**
* @brief Set a pointer the caller-defined cbdata structure.
*
* The data must persist at least until `clcb_stats_submit()` is called, or
* `clcb_stats_flush()` is called (optional).
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The scanning engine.
* @param cbdata The statistics data. Probably a pointer to a malloc'd struct.
*/
extern void cl_engine_set_stats_set_cbdata(struct cl_engine *engine, void *cbdata);
/**
* @brief Add sample metadata to the statistics for a sample that matched on a signature.
*
* @param virname Name of the signature that matched.
* @param md5 Sample hash.
* @param size Sample size.
* @param sections PE section data, if applicable.
* @param cbdata The statistics data. Probably a pointer to a malloc'd struct.
*/
typedef void (*clcb_stats_add_sample)(
const char *virname,
const unsigned char *md5,
size_t size,
stats_section_t *sections,
void *cbdata);
/**
* @brief Set a custom callback function to add sample metadata to a statistics report.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_stats_add_sample(struct cl_engine *engine, clcb_stats_add_sample callback);
/**
* @brief Remove a specific sample from the statistics report.
*
* @param virname Name of the signature that matched.
* @param md5 Sample hash.
* @param size Sample size.
* @param cbdata The statistics data. Probably a pointer to a malloc'd struct.
*/
typedef void (*clcb_stats_remove_sample)(const char *virname, const unsigned char *md5, size_t size, void *cbdata);
/**
* @brief Set a custom callback function to remove sample metadata from a statistics report.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_stats_remove_sample(struct cl_engine *engine, clcb_stats_remove_sample callback);
/**
* @brief Decrement the hit count listed in the statistics report for a specific sample.
*
* @param virname Name of the signature that matched.
* @param md5 Sample hash.
* @param size Sample size.
* @param cbdata The statistics data. Probably a pointer to a malloc'd struct.
*/
typedef void (*clcb_stats_decrement_count)(const char *virname, const unsigned char *md5, size_t size, void *cbdata);
/**
* @brief Set a custom callback function to decrement the hit count listed in the statistics report for a specific sample.
*
* This function may remove the sample from the report if the hit count is decremented to 0.
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_stats_decrement_count(struct cl_engine *engine, clcb_stats_decrement_count callback);
/**
* @brief Function to submit a statistics report.
*
* @param engine The initialized scanning engine.
* @param cbdata The statistics data. Probably a pointer to a malloc'd struct.
*/
typedef void (*clcb_stats_submit)(struct cl_engine *engine, void *cbdata);
/**
* @brief Set a custom callback function to submit the statistics report.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_stats_submit(struct cl_engine *engine, clcb_stats_submit callback);
/**
* @brief Function to flush/free the statistics report data.
*
* @param engine The initialized scanning engine.
* @param cbdata The statistics data. Probably a pointer to a malloc'd struct.
*/
typedef void (*clcb_stats_flush)(struct cl_engine *engine, void *cbdata);
/**
* @brief Set a custom callback function to flush/free the statistics report data.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_stats_flush(struct cl_engine *engine, clcb_stats_flush callback);
/**
* @brief Function to get the number of samples listed in the statistics report.
*
* @param cbdata The statistics data. Probably a pointer to a malloc'd struct.
*/
typedef size_t (*clcb_stats_get_num)(void *cbdata);
/**
* @brief Set a custom callback function to get the number of samples listed in the statistics report.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_stats_get_num(struct cl_engine *engine, clcb_stats_get_num callback);
/**
* @brief Function to get the size of memory used to store the statistics report.
*
* @param cbdata The statistics data. Probably a pointer to a malloc'd struct.
*/
typedef size_t (*clcb_stats_get_size)(void *cbdata);
/**
* @brief Set a custom callback function to get the size of memory used to store the statistics report.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_stats_get_size(struct cl_engine *engine, clcb_stats_get_size callback);
/**
* @brief Function to get the machine's unique host ID.
*
* @param cbdata The statistics data. Probably a pointer to a malloc'd struct.
*/
typedef char *(*clcb_stats_get_hostid)(void *cbdata);
/**
* @brief Set a custom callback function to get the machine's unique host ID.
*
* Caution: changing options for an engine that is in-use is not thread-safe!
*
* @param engine The initialized scanning engine.
* @param callback The callback function pointer.
*/
extern void cl_engine_set_clcb_stats_get_hostid(struct cl_engine *engine, clcb_stats_get_hostid callback);
/**
* @brief Function enables the built-in statistics reporting feature.
*
* @param engine The initialized scanning engine.
*/
extern void cl_engine_stats_enable(struct cl_engine *engine);
/* ----------------------------------------------------------------------------
* File scanning.
*/
/**
* @brief Scan a file, given a file descriptor.
*
* @deprecated This function is deprecated and will be removed in a future release. Use `cl_scandesc_ex()` instead.
*
* @param desc File descriptor of an open file. The caller must provide this or the map.
* @param filename (optional) Filepath of the open file descriptor or file map.
* @param[out] virname Will be set to a statically allocated (i.e. needs not be freed) signature name if the scan matches against a signature.
* @param[out] scanned The number of bytes scanned / CL_COUNT_PRECISION.
* @param engine The scanning engine.
* @param scanoptions Scanning options.
* @return cl_error_t CL_SUCCESS, CL_VIRUS, or an error code if an error occurred during the scan.
*/
extern cl_error_t cl_scandesc(
int desc,
const char *filename,
const char **virname,
unsigned long int *scanned,
const struct cl_engine *engine,
struct cl_scan_options *scanoptions);
/**
* @brief Scan a file, given a file descriptor.
*
* @deprecated This function is deprecated and will be removed in a future release. Use `cl_scandesc_ex()` instead.
*
* This callback variant allows the caller to provide a context structure that
* caller provided callback functions can interpret.
*
* @param desc File descriptor of an open file. The caller must provide this or the map.
* @param filename (optional) Filepath of the open file descriptor or file map.
* @param[out] virname Will be set to a statically allocated (i.e. needs not be freed) signature name if the scan matches against a signature.
* @param[out] scanned The number of bytes scanned / CL_COUNT_PRECISION.
* @param engine The scanning engine.
* @param scanoptions Scanning options.
* @param[in,out] context (Optional) An application-defined context struct, opaque to libclamav.
* May be used within your callback functions.
* @return cl_error_t CL_SUCCESS, CL_VIRUS, or an error code if an error occurred during the scan.
*/
extern cl_error_t cl_scandesc_callback(
int desc,
const char *filename,
const char **virname,
unsigned long int *scanned,
const struct cl_engine *engine,
struct cl_scan_options *scanoptions,
void *context);
/**
* @brief Scan a file, given a file descriptor.
*
* This callback variant allows the caller to provide a context structure that
* caller provided callback functions can interpret.
*
* This extended version of cl_scanmap_callback allows the caller to provide
* additional hints to the scanning engine, such as a file hash and file type.
*
* This variant also upgrades the `scanned` output parameter to a 64-bit integer.
*
* @param desc File descriptor of an open file. The caller must provide this or the map.
* @param filename (Optional) Filepath of the open file descriptor or file map.
* @param[out] verdict_out A pointer to a cl_verdict_t that will be set to the scan verdict.
* You should check the verdict even if the function returns an error.
* @param[out] last_alert_out Will be set to a statically allocated (i.e. needs not be freed) signature name if the scan
* matches against a signature.
* @param[out] scanned_out The (exact) number of bytes scanned.
* @param engine The scanning engine.
* @param scanoptions Scanning options.
* @param[in,out] context (Optional) An application-defined context struct, opaque to libclamav.
* May be used within your callback functions.
* @param hash_hint (Optional) A NULL terminated string of the file hash so that
* libclamav does not need to calculate it.
* @param[out] hash_out (Optional) A NULL terminated string of the file hash.
* The caller is responsible for freeing the string.
* @param hash_alg The hashing algorithm used for either `hash_hint` or `hash_out`.
* Supported algorithms are "md5", "sha1", "sha2-256".
* If not specified, the default is "sha2-256".
* @param file_type_hint (Optional) A NULL terminated string of the file type hint.
* E.g. "pe", "elf", "zip", etc.
* You may also use ClamAV type names such as "CL_TYPE_PE".
* ClamAV will ignore the hint if it is not familiar with the specified type.
* See also: https://docs.clamav.net/appendix/FileTypes.html#file-types
* @param[out] file_type_out (Optional) A NULL terminated string of the file type
* of the top layer as determined by ClamAV.
* Will take the form of the standard ClamAV file type format. E.g. "CL_TYPE_PE".
* See also: https://docs.clamav.net/appendix/FileTypes.html#file-types
* @return cl_error_t CL_SUCCESS if no error occured.
* Otherwise a CL_E* error code.
* Does NOT return CL_VIRUS for a signature match. Check the `verdict_out` parameter instead.
*/
extern cl_error_t cl_scandesc_ex(
int desc,
const char *filename,
cl_verdict_t *verdict_out,
const char **last_alert_out,
uint64_t *scanned_out,
const struct cl_engine *engine,
struct cl_scan_options *scanoptions,
void *context,
const char *hash_hint,
char **hash_out,
const char *hash_alg,
const char *file_type_hint,
char **file_type_out);
/**
* @brief Scan a file, given a filename.
*
* @deprecated This function is deprecated and will be removed in a future release. Use `cl_scanfile_ex()` instead.
*
* @param filename Filepath of the file to be scanned.
* @param[out] virname Will be set to a statically allocated (i.e. needs not be freed) signature name if the scan matches against a signature.
* @param[out] scanned The number of bytes scanned / CL_COUNT_PRECISION.
* @param engine The scanning engine.
* @param scanoptions Scanning options.
* @return cl_error_t CL_SUCCESS, CL_VIRUS, or an error code if an error occurred during the scan.
*/
extern cl_error_t cl_scanfile(
const char *filename,
const char **virname,
unsigned long int *scanned,
const struct cl_engine *engine,
struct cl_scan_options *scanoptions);
/**
* @brief Scan a file, given a filename.
*
* @deprecated This function is deprecated and will be removed in a future release. Use `cl_scanfile_ex()` instead.
*
* This callback variant allows the caller to provide a context structure that
* caller provided callback functions can interpret.
*
* @param filename Filepath of the file to be scanned.
* @param[out] virname Will be set to a statically allocated (i.e. needs not be freed) signature name if the scan matches against a signature.
* @param[out] scanned The number of bytes scanned / CL_COUNT_PRECISION.
* @param engine The scanning engine.
* @param scanoptions Scanning options.
* @param[in,out] context (Optional) An application-defined context struct, opaque to libclamav.
* May be used within your callback functions.
* @return cl_error_t CL_SUCCESS, CL_VIRUS, or an error code if an error occurred during the scan.
*/
extern cl_error_t cl_scanfile_callback(
const char *filename,
const char **virname,
unsigned long int *scanned,
const struct cl_engine *engine,
struct cl_scan_options *scanoptions,
void *context);
/**
* @brief Scan a file, given a filename.
*
* This callback variant allows the caller to provide a context structure that
* caller provided callback functions can interpret.
*
* This extended version of cl_scanmap_callback allows the caller to provide
* additional hints to the scanning engine, such as a file hash and file type.
*
* This variant also upgrades the `scanned` output parameter to a 64-bit integer.
*
* @param filename Filepath of the file to be scanned.
* @param[out] verdict_out A pointer to a cl_verdict_t that will be set to the scan verdict.
* You should check the verdict even if the function returns an error.
* @param[out] last_alert_out Will be set to a statically allocated (i.e. needs not be freed) signature name if the scan
* matches against a signature.
* @param[out] scanned_out The (exact) number of bytes scanned.
* @param engine The scanning engine.
* @param scanoptions Scanning options.
* @param[in,out] context (Optional) An application-defined context struct, opaque to libclamav.
* May be used within your callback functions.
* @param hash_hint (Optional) A NULL terminated string of the file hash so that
* libclamav does not need to calculate it.
* @param[out] hash_out (Optional) A NULL terminated string of the file hash.
* The caller is responsible for freeing the string.
* @param hash_alg The hashing algorithm used for either `hash_hint` or `hash_out`.
* Supported algorithms are "md5", "sha1", "sha2-256".
* If not specified, the default is "sha2-256".
* @param file_type_hint (Optional) A NULL terminated string of the file type hint.
* E.g. "pe", "elf", "zip", etc.
* You may also use ClamAV type names such as "CL_TYPE_PE".
* ClamAV will ignore the hint if it is not familiar with the specified type.
* See also: https://docs.clamav.net/appendix/FileTypes.html#file-types
* @param[out] file_type_out (Optional) A NULL terminated string of the file type
* of the top layer as determined by ClamAV.
* Will take the form of the standard ClamAV file type format. E.g. "CL_TYPE_PE".
* See also: https://docs.clamav.net/appendix/FileTypes.html#file-types
* @return cl_error_t CL_SUCCESS if no error occured.
* Otherwise a CL_E* error code.
* Does NOT return CL_VIRUS for a signature match. Check the `verdict_out` parameter instead.
*/
extern cl_error_t cl_scanfile_ex(
const char *filename,
cl_verdict_t *verdict_out,
const char **last_alert_out,
uint64_t *scanned_out,
const struct cl_engine *engine,
struct cl_scan_options *scanoptions,
void *context,
const char *hash_hint,
char **hash_out,
const char *hash_alg,
const char *file_type_hint,
char **file_type_out);
/**
* @brief Scan custom data, given a fmap.
*
* @deprecated This function is deprecated and will be removed in a future release. Use `cl_scanmap_ex()` instead.
*
* Fmaps are an abstraction representing a file or memory buffer.
*
* Create one using:
* - `cl_fmap_open_handle()` for a file handle, or
* - `cl_fmap_open_memory()` for a memory buffer.
*
* After the scan, you can also get the file hash with `cl_fmap_get_file_hash()`.
*
* @param map Buffer to be scanned, in form of a cl_fmap_t.
* @param filename Name of data origin. Does not need to be an actual
* file on disk. May be NULL if a name is not available.
* @param[out] virname Pointer to receive the signature match name name if a
* signature matched.
* @param[out] scanned Number of bytes scanned / CL_COUNT_PRECISION.
* @param engine The scanning engine.
* @param scanoptions The scanning options struct.
* @param context An application-defined context struct, opaque to
* libclamav. May be used within your callback functions.
* @return cl_error_t CL_SUCCESS if no signature matched. CL_VIRUS if a
* signature matched. Another CL_E* error code if an
* error occurred.
*/
extern cl_error_t cl_scanmap_callback(
cl_fmap_t *map,
const char *filename,
const char **virname,
unsigned long int *scanned,
const struct cl_engine *engine,
struct cl_scan_options *scanoptions,
void *context);
/**
* @brief Scan custom data, given a map.
*
* Fmaps are an abstraction representing a file or memory buffer.
*
* Create one using:
* - `cl_fmap_open_handle()` for a file handle, or
* - `cl_fmap_open_memory()` for a memory buffer.
*
* After the scan, you can also get the file hash with `cl_fmap_get_file_hash()`.
*
* This extended version of cl_scanmap_callback allows the caller to provide
* additional hints to the scanning engine, such as a file hash and file type.
*
* This variant also upgrades the `scanned` output parameter to a 64-bit integer.
*
* @param map Buffer to be scanned, in form of a cl_fmap_t.
* @param filename (Optional) Name of data origin. Does not need to be an actual file on disk.
* May be NULL if a name is not available.
* @param[out] verdict_out A pointer to a cl_verdict_t that will be set to the scan verdict.
* You should check the verdict even if the function returns an error.
* @param[out] last_alert_out Will be set to a statically allocated (i.e. needs not be freed) signature name if the scan
* matches against a signature.
* @param[out] scanned_out The (exact) number of bytes scanned.
* @param engine The scanning engine.
* @param scanoptions Scanning options.
* @param[in,out] context (Optional) An application-defined context struct, opaque to libclamav.
* May be used within your callback functions.
* @param hash_hint (Optional) A NULL terminated string of the file hash so that
* libclamav does not need to calculate it.
* @param[out] hash_out (Optional) A NULL terminated string of the file hash.
* The caller is responsible for freeing the string.
* @param hash_alg The hashing algorithm used for either `hash_hint` or `hash_out`.
* Supported algorithms are "md5", "sha1", "sha2-256".
* If not specified, the default is "sha2-256".
* @param file_type_hint (Optional) A NULL terminated string of the file type hint.
* E.g. "pe", "elf", "zip", etc.
* You may also use ClamAV type names such as "CL_TYPE_PE".
* ClamAV will ignore the hint if it is not familiar with the specified type.
* See also: https://docs.clamav.net/appendix/FileTypes.html#file-types
* @param[out] file_type_out (Optional) A NULL terminated string of the file type
* of the top layer as determined by ClamAV.
* Will take the form of the standard ClamAV file type format. E.g. "CL_TYPE_PE".
* See also: https://docs.clamav.net/appendix/FileTypes.html#file-types
* @return cl_error_t CL_SUCCESS if no error occured.
* Otherwise a CL_E* error code.
* Does NOT return CL_VIRUS for a signature match. Check the `verdict_out` parameter instead.
*/
extern cl_error_t cl_scanmap_ex(
cl_fmap_t *map,
const char *filename,
cl_verdict_t *verdict_out,
const char **last_alert_out,
uint64_t *scanned_out,
const struct cl_engine *engine,
struct cl_scan_options *scanoptions,
void *context,
const char *hash_hint,
char **hash_out,
const char *hash_alg,
const char *file_type_hint,
char **file_type_out);
/* ----------------------------------------------------------------------------
* Database handling.
*/
/**
* @brief Load the signature databases found at the path.
*
* @param path May be a file or directory.
* @param engine The engine to load the signatures into
* @param[out] signo The number of signatures loaded
* @param dboptions Database load bitflag field. See the CL_DB_* defines, above.
* @return cl_error_t
*/
extern cl_error_t cl_load(const char *path, struct cl_engine *engine, unsigned int *signo, unsigned int dboptions);
/**
* @brief Get the default database directory path.
*
* @return const char*
*/
extern const char *cl_retdbdir(void);
/* ----------------------------------------------------------------------------
* CVD / database functions
*/
struct cl_cvd { /* field no. */
char *time; /* 2 */
unsigned int version; /* 3 */
unsigned int sigs; /* 4 */
unsigned int fl; /* 5 */
/* padding */
char *md5; /* 6 */
char *dsig; /* 7 */
char *builder; /* 8 */
unsigned int stime; /* 9 */
};
/**
* @brief Read the CVD header data from a file.
*
* The returned pointer must be free'd with cl_cvdfree().
*
* @param file Filepath of CVD file.
* @return struct cl_cvd* Pointer to an allocated CVD header data structure.
*/
extern struct cl_cvd *cl_cvdhead(const char *file);
/**
* @brief Parse the CVD header.
*
* Buffer length is not an argument, and the check must be done
* by the caller cl_cvdhead().
*
* The returned pointer must be free'd with cl_cvdfree().
*
* @param head Pointer to the header data buffer.
* @return struct cl_cvd* Pointer to an allocated CVD header data structure.
*/
extern struct cl_cvd *cl_cvdparse(const char *head);
/**
* @brief Verify a CVD file by loading and unloading it.
*
* @deprecated This function is deprecated and will be removed in a future release. Use cl_cvdverify_ex() instead.
*
* @param file Filepath of CVD file.
* @return cl_error_t CL_SUCCESS if success, else a CL_E* error code.
*/
extern cl_error_t cl_cvdverify(const char *file);
/**
* @brief Verify a CVD file by loading and unloading it.
*
* May also verify the CVD digital signature.
*
* @param file Filepath of CVD file.
* @param certs_directory Directory containing CA certificates required to verify the CVD digital signature.
* @param dboptions Bitmask of flags to modify behavior.
* Set CL_DB_FIPS_LIMITS to require the CVD to be signed with a FIPS-compliant external '.sign' file.
* Set CL_DB_UNSIGNED to disable verification of CVD digital signatures. Allow load testing unsigned CVD files.
* @return cl_error_t CL_SUCCESS if success, else a CL_E* error code.
*/
extern cl_error_t cl_cvdverify_ex(const char *file, const char *certs_directory, uint32_t dboptions);
/**
* @brief Free a CVD header struct.
*
* @param cvd Pointer to a CVD header struct.
*/
extern void cl_cvdfree(struct cl_cvd *cvd);
/**
* @brief Unpack a CVD file.
*
* @deprecated This function is deprecated and will be removed in a future release. Use cl_cvdunpack_ex() instead.
*
* Will verify the CVD is correctly signed unless the `dont_verify` parameter is true.
*
* This function is deprecated. Use cl_cvdunpack_ex() instead.
*
* @param file Filepath of CVD file.
* @param dir Destination directory.
* @param dont_verify If true, don't verify the CVD.
* @return cl_error_t CL_SUCCESS if success, else a CL_E* error code.
*/
extern cl_error_t cl_cvdunpack(const char *file, const char *dir, bool dont_verify);
/**
* @brief Unpack a CVD file.
*
* Will verify the CVD is correctly signed unless the `dont_verify` parameter is true.
*
* @param file Filepath of CVD file.
* @param dir Destination directory.
* @param certs_directory Path where ClamAV public certs are located, needed to verify external digital signatures.
* @param dboptions Bitmask of flags to modify behavior.
* Set CL_DB_FIPS_LIMITS to require the CVD to be signed with a FIPS-compliant external '.sign' file.
* Set CL_DB_UNSIGNED to disable verification of CVD digital signatures. Allow load testing unsigned CVD files.
* @return cl_error_t CL_SUCCESS if success, else a CL_E* error code.
*/
cl_error_t cl_cvdunpack_ex(const char *file, const char *dir, const char *certs_directory, uint32_t dboptions);
/**
* @brief Retrieve the age of CVD disk data.
*
* Will retrieve the age of the youngest file in a database directory,
* or the age of a single CVD (or CLD) file.
*
* @param path Filepath of CVD directory or file.
* @param age_seconds Age of the directory or file.
* @return cl_error_t CL_SUCCESS if success, else a CL_E* error code.
*/
extern cl_error_t cl_cvdgetage(const char *path, time_t *age_seconds);
/* ----------------------------------------------------------------------------
* DB directory stat functions.
* Use these functions to watch for database changes.
*/
struct cl_stat {
char *dir;
STATBUF *stattab;
char **statdname;
unsigned int entries;
};
/**
* @brief Initialize a directory to be watched for database changes.
*
* The dbstat out variable is allocated and must be freed using cl_statfree().
*
* @param dirname Pathname of the database directory.
* @param[out] dbstat dbstat handle.
* @return cl_error_t CL_SUCCESS if successfully initialized.
*/
extern cl_error_t cl_statinidir(const char *dirname, struct cl_stat *dbstat);
/**
* @brief Check the database directory for changes.
*
* @param dbstat dbstat handle.
* @return int 0 No change.
* @return int 1 Some change occurred.
*/
extern int cl_statchkdir(const struct cl_stat *dbstat);
/**
* @brief Free the dbstat handle.
*
* @param dbstat dbstat handle.
* @return cl_error_t CL_SUCCESS
* @return cl_error_t CL_ENULLARG
*/
extern cl_error_t cl_statfree(struct cl_stat *dbstat);
/**
* @brief Count the number of signatures in a database file or directory.
*
* @param path Path of the database file or directory.
* @param countoptions A bitflag field. May be CL_COUNTSIGS_OFFICIAL, CL_COUNTSIGS_UNOFFICIAL, or CL_COUNTSIGS_ALL.
* @param[out] sigs The number of sigs.
* @return cl_error_t CL_SUCCESS if success, else a CL_E* error type.
*/
extern cl_error_t cl_countsigs(const char *path, unsigned int countoptions, unsigned int *sigs);
/* ----------------------------------------------------------------------------
* Software versions.
*/
/**
* @brief Get the Functionality Level (FLEVEL).
*
* @return unsigned int The FLEVEL.
*/
extern unsigned int cl_retflevel(void);
/**
* @brief Get the ClamAV version string.
*
* E.g. clamav-0.100.0-beta
*
* @return const char* The version string.
*/
extern const char *cl_retver(void);
/* ----------------------------------------------------------------------------
* Others.
*/
extern const char *cl_strerror(cl_error_t clerror);
/* ----------------------------------------------------------------------------
* Hashing functions.
*/
#define MD5_HASH_SIZE 16
#define SHA1_HASH_SIZE 20
#define SHA256_HASH_SIZE 32
#define SHA384_HASH_SIZE 48
#define SHA512_HASH_SIZE 64
#define CL_HASH_FLAG_NONE 0x00 /* None */
#define CL_HASH_FLAG_ALLOCATE 0x01 /* Use CL_HASH_FLAG_ALLOCATE to dynamically allocate the output buffer. \
* If this flag is set, the function will allocate a buffer for the hash and return it. \
* The caller is responsible for freeing the buffer using free(). \
* If this flag is not set, the caller must provide a buffer to store the hash. */
#define CL_HASH_FLAG_FIPS_BYPASS 0x02 /* Use CL_HASH_FLAG_FIPS_BYPASS to bypass FIPS restrictions on which algorithms can be \
* used. This is useful if you want to use algorithms that are not FIPS-approved. \
* For example, you might want to use this flag if you want to use "md5" or "sha1". \
* You should only do this when the hash is used for non-cryptographic purposes. \
* Note: If OpenSSL's FIPS provider is not available, this flag has no effect. */
/**
* @brief Generate a hash of data.
*
* @param alg The hashing algorithm to use.
* Suggested "alg" names include "md5", "sha1", "sha2-256", "sha2-384", and "sha2-512".
* But the underlying hashing library is OpenSSL and you might be able to use
* other algorithms supported by OpenSSL's EVP_get_digestbyname() function.
* Note: For the `cl_scan*` functions (above) the supported algorithms are
* presently limited to "md5", "sha1", "sha2-256".
* @param data The data to be hashed.
* @param data_len The length of the to-be-hashed data.
* @param[inout] hash A buffer to store the generated hash.
* Set flags to CL_HASH_FLAG_ALLOCATE to dynamically allocate buffer.
* @param[inout] hash_len If providing a buffer, set this to the size of the buffer.
* If allocating, this is purely an output parameter and need not be initialized.
* @param flags Flags to modify the behavior of the hashing function.
* Use CL_HASH_FLAG_ALLOCATE to dynamically allocate the output buffer.
* Use CL_HASH_FLAG_FIPS_BYPASS to bypass FIPS restrictions on which algorithms can be used.
*
* @return cl_error_t CL_SUCCESS if the hash was generated successfully.
* CL_E* error code if an error occurred.
*/
extern cl_error_t cl_hash_data_ex(
const char *alg,
const uint8_t *data,
size_t data_len,
uint8_t **hash,
size_t *hash_len,
uint32_t flags);
struct cl_hash_ctx;
typedef struct cl_hash_ctx cl_hash_ctx_t;
/**
* @brief Initialize a hash context.
*
* @param alg The hash algorithm to use.
* @param flags Flags to modify the behavior of the hashing function.
* Use CL_HASH_FLAG_FIPS_BYPASS to bypass FIPS restrictions on which algorithms can be used.
* @return cl_error_t CL_SUCCESS if the hash context was successfully initialized.
*/
extern cl_error_t cl_hash_init_ex(
const char *alg,
uint32_t flags,
cl_hash_ctx_t **ctx_out);
/**
* @brief Update a hash context with new data.
*
* @param ctx The hash context.
* @param data The data to hash.
* @param length The size of the data.
* @return cl_error_t CL_SUCCESS if the data was successfully added to the hash context.
* CL_E* error code if an error occurred.
*/
extern cl_error_t cl_update_hash_ex(
cl_hash_ctx_t *ctx,
const uint8_t *data,
size_t length);
/**
* @brief Finalize a hash context and get the resulting hash.
*
* @param ctx The hash context.
* @param[inout] hash A buffer to store the generated hash.
* Set flags to CL_HASH_FLAG_ALLOCATE to dynamically allocate buffer.
* @param[inout] hash_len If providing a buffer, set this to the size of the buffer.
* If allocating, this is purely an output parameter and need not be initialized.
* @param flags Flags to modify the behavior of the hashing function.
* Use CL_HASH_FLAG_ALLOCATE to dynamically allocate the output buffer.
*
* @return cl_error_t CL_SUCCESS if the hash was successfully finalized.
* CL_E* error code if an error occurred.
*/
extern cl_error_t cl_finish_hash_ex(
cl_hash_ctx_t *ctx,
uint8_t **hash,
size_t *hash_len,
uint32_t flags);
/**
* @brief Destroy a hash context.
*
* @param ctx The hash context.
*/
extern void cl_hash_destroy_ex(cl_hash_ctx_t *ctx);
/**
* @brief Generate a hash of a file.
*
* @param alg The hashing algorithm to use.
* @param fd The file descriptor.
* @param offset The offset in the file to start hashing from.
* @param length The length of the data to hash. If 0, the entire file will be hashed.
* @param[inout] hash A buffer to store the generated hash.
* Set flags to CL_HASH_FLAG_ALLOCATE to dynamically allocate buffer.
* @param[inout] hash_len A pointer that stores how long the generated hash is.
* @param flags Flags to modify the behavior of the hashing function.
* Use CL_HASH_FLAG_ALLOCATE to dynamically allocate the output buffer.
* Use CL_HASH_FLAG_FIPS_BYPASS to bypass FIPS restrictions on which algorithms can be used.
*
* @return cl_error_t CL_SUCCESS if the hash was generated successfully.
*/
extern cl_error_t cl_hash_file_fd_ex(
const char *alg,
int fd,
size_t offset,
size_t length,
uint8_t **hash,
size_t *hash_len,
uint32_t flags);
/**
* @brief Generate a hash of data.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `cl_hash_data_ex()` instead.
*
* Note: This function intentionally bypasses FIPS restrictions on which algorithms can be used.
* Do not use this function for cryptographic purposes or for false positive hash checks.
*
* @param alg The hashing algorithm to use.
* @param buf The data to be hashed.
* @param len The length of the to-be-hashed data.
* @param[out] obuf (optional) A buffer to store the generated hash. Use NULL to dynamically allocate buffer.
* If providing, use the *_HASH_SIZE macros above to determine the required buffer size.
* @param[out] olen (optional) A pointer that stores how long the generated hash is.
* This is purely an output parameter and need not be initialized.
* @return A pointer to the generated hash or obuf if obuf is not NULL.
*/
extern unsigned char *cl_hash_data(const char *alg, const void *buf, size_t len, unsigned char *obuf, unsigned int *olen);
/**
* @brief Generate a hash of a file given a file descriptor.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Note: there is no `cl_hash_file_fd_ctx_ex()` function. Use `cl_hash_file_fd_ex()` instead.
*
* @param ctx A pointer to the OpenSSL EVP_MD_CTX object.
* @param fd The file descriptor.
* @param[out] olen (optional) The length of the generated hash.
* @return A pointer to a malloc'd buffer that holds the generated hash.
*/
extern unsigned char *cl_hash_file_fd_ctx(EVP_MD_CTX *ctx, int fd, unsigned int *olen);
/**
* @brief Generate a hash of a file given a file descriptor.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `cl_hash_file_fd_ex()` instead.
*
* Note: This function intentionally bypasses FIPS restrictions on which algorithms can be used.
* Do not use this function for cryptographic purposes or for false positive hash checks.
*
* @param fd The file descriptor.
* @param alg The hashing algorithm to use.
* @param[out] olen (optional) The length of the generated hash.
* @return A pointer to a malloc'd buffer that holds the generated hash.
*/
extern unsigned char *cl_hash_file_fd(int fd, const char *alg, unsigned int *olen);
/**
* @brief Generate a hash of a file given a FILE pointer.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Note: There is no `cl_hash_file_fp_ex()` function. Use `cl_hash_file_fd_ex()` instead.
*
* Note: This function intentionally bypasses FIPS restrictions on which algorithms can be used.
* Do not use this function for cryptographic purposes or for false positive hash checks.
*
* @param fp A pointer to a FILE object.
* @param alg The hashing algorithm to use.
* @param[out] olen (optional) The length of the generated hash.
* @return A pointer to a malloc'd buffer that holds the generated hash.
*/
extern unsigned char *cl_hash_file_fp(FILE *fp, const char *alg, unsigned int *olen);
/**
* @brief Generate a sha2-256 hash of data.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `cl_hash_data_ex()` instead.
*
* @param buf The data to hash.
* @param len The length of the to-be-hashed data.
* @param[out] obuf (optional) A pointer to store the generated hash. Use NULL to dynamically allocate buffer.
* @param[out] olen (optional) The length of the generated hash.
* @return A pointer to a malloc'd buffer that holds the generated hash.
*/
extern unsigned char *cl_sha256(const void *buf, size_t len, unsigned char *obuf, unsigned int *olen);
/**
* @brief Generate a sha2-384 hash of data.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `cl_hash_data_ex()` instead.
*
* @param buf The data to hash.
* @param len The length of the to-be-hashed data.
* @param[out] obuf (optional) A pointer to store the generated hash. Use NULL to dynamically allocate buffer.
* @param[out] olen (optional) The length of the generated hash.
* @return A pointer to a malloc'd buffer that holds the generated hash.
*/
extern unsigned char *cl_sha384(const void *buf, size_t len, unsigned char *obuf, unsigned int *olen);
/**
* @brief Generate a sha2-512 hash of data.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `cl_hash_data_ex()` instead.
*
* @param buf The data to hash.
* @param len The length of the to-be-hashed data.
* @param[out] obuf (optional) A pointer to store the generated hash. Use NULL to dynamically allocate buffer.
* @param[out] olen (optional) The length of the generated hash.
* @return A pointer to a malloc'd buffer that holds the generated hash.
*/
extern unsigned char *cl_sha512(const void *buf, size_t len, unsigned char *obuf, unsigned int *olen);
/**
* @brief Generate a sha1 hash of data.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `cl_hash_data_ex()` instead.
*
* Note: This function intentionally bypasses FIPS restrictions on which algorithms can be used.
* Do not use this function for cryptographic purposes or for false positive hash checks.
*
* @param buf The data to hash.
* @param len The length of the to-be-hashed data.
* @param[out] obuf (optional) A pointer to store the generated hash. Use NULL to dynamically allocate buffer.
* @param[out] olen (optional) The length of the generated hash.
* @return A pointer to a malloc'd buffer that holds the generated hash.
*/
extern unsigned char *cl_sha1(const void *buf, size_t len, unsigned char *obuf, unsigned int *olen);
/**
* @brief Initialize a hash context.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `cl_hash_init_ex()` instead.
*
* Note: This function intentionally bypasses FIPS restrictions on which algorithms can be used.
* Do not use this function for cryptographic purposes or for false positive hash checks.
*
* @param alg The hash algorithm to use.
* @return void*
*/
extern void *cl_hash_init(const char *alg);
/**
* @brief Update a hash context with new data.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `cl_update_hash_ex()` instead.
*
* @param ctx The hash context.
* @param data The data to hash.
* @param sz The size of the data.
* @return int 0 on success, -1 on error.
*/
extern int cl_update_hash(void *ctx, const void *data, size_t sz);
/**
* @brief Finalize a hash context and get the resulting hash.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `cl_finish_hash_ex()` instead.
*
* @param ctx The hash context.
* @param buf A buffer to store the resulting hash. Must be large enough to hold the hash.
* @return int 0 on success, -1 on error.
*/
extern int cl_finish_hash(void *ctx, void *buf);
/**
* @brief Destroy a hash context.
*
* @deprecated This function is deprecated and will be removed in a future release.
* Use `cl_hash_destroy_ex()` instead.
*
* @param ctx The hash context.
*/
extern void cl_hash_destroy(void *ctx);
/* -------------------------------------------------------------------------------
* Signing and verification functions.
*/
/**
* @brief Verify validity of signed data.
*
* @param pkey The public key of the keypair that signed the data.
* @param alg The algorithm used to hash the data.
* @param sig The signature block.
* @param siglen The length of the signature.
* @param data The data that was signed.
* @param datalen The length of the data.
* @param decode Whether or not to base64-decode the signature prior to verification. 1 for yes, 0 for no.
* @return 0 for success, -1 for error or invalid signature.
*/
extern int cl_verify_signature(
EVP_PKEY *pkey,
const char *alg,
unsigned char *sig,
unsigned int siglen,
unsigned char *data,
size_t datalen,
int decode);
/**
* @brief Verify validity of signed data.
*
* @param pkey The public key of the keypair that signed the data.
* @param alg The algorithm used to hash the data.
* @param sig The signature block.
* @param siglen The length of the signature.
* @param digest The hash of the signed data.
* @return 0 for success, -1 for error or invalid signature.
*/
extern int cl_verify_signature_hash(
EVP_PKEY *pkey,
const char *alg,
unsigned char *sig,
unsigned int siglen,
unsigned char *digest);
/**
* @brief Verify validity of signed data.
*
* @param pkey The public key of the keypair that signed the data.
* @param alg The algorithm used to hash the data.
* @param sig The signature block.
* @param siglen The length of the signature.
* @param fd The file descriptor.
* @return 0 for success, -1 for error or invalid signature.
*/
extern int cl_verify_signature_fd(
EVP_PKEY *pkey,
const char *alg,
unsigned char *sig,
unsigned int siglen,
int fd);
/**
* @brief Verify validity of signed data.
*
* @param x509path The path to the public key of the keypair that signed the data.
* @param alg The algorithm used to hash the data.
* @param sig The signature block.
* @param siglen The length of the signature.
* @param digest The hash of the signed data.
* @return 0 for success, -1 for error or invalid signature.
*/
extern int cl_verify_signature_hash_x509_keyfile(
char *x509path,
const char *alg,
unsigned char *sig,
unsigned int siglen,
unsigned char *digest);
/**
* @brief Verify validity of signed data.
*
* @param x509path The path to the public key of the keypair that signed the data.
* @param alg The algorithm used to hash the data.
* @param sig The signature block.
* @param siglen The length of the signature.
* @param fd The file descriptor.
* @return 0 for success, -1 for error or invalid signature.
*/
extern int cl_verify_signature_fd_x509_keyfile(
char *x509path,
const char *alg,
unsigned char *sig,
unsigned int siglen,
int fd);
/**
* @brief Verify validity of signed data.
*
* @param x509path The path to the public key of the keypair that signed the data.
* @param alg The algorithm used to hash the data.
* @param sig The signature block.
* @param siglen The length of the signature.
* @param data The data that was signed.
* @param datalen The length of the data.
* @param decode Whether or not to base64-decode the signature prior to verification. 1 for yes, 0 for no.
* @return 0 for success, -1 for error or invalid signature.
*/
extern int cl_verify_signature_x509_keyfile(
char *x509path,
const char *alg,
unsigned char *sig,
unsigned int siglen,
unsigned char *data,
size_t datalen,
int decode);
/**
* @brief Verify validity of signed data
*
* @param x509 The X509 object of the public key of the keypair that signed the data.
* @param alg The algorithm used to hash the data.
* @param sig The signature block.
* @param siglen The length of the signature.
* @param digest The hash of the signed data.
* @return 0 for success, -1 for error or invalid signature.
*/
extern int cl_verify_signature_hash_x509(
X509 *x509,
const char *alg,
unsigned char *sig,
unsigned int siglen,
unsigned char *digest);
/**
* @brief Verify validity of signed data.
*
* @param x509 The X509 object of the public key of the keypair that signed the data.
* @param alg The algorithm used to hash the data.
* @param sig The signature block.
* @param siglen The length of the signature.
* @param fd The file descriptor.
* @return 0 for success, -1 for error or invalid signature.
*/
extern int cl_verify_signature_fd_x509(X509 *x509, const char *alg, unsigned char *sig, unsigned int siglen, int fd);
/**
* @brief Verify validity of signed data.
*
* @param x509 The X509 object of the public key of the keypair that signed the data.
* @param alg The algorithm used to hash the data.
* @param sig The signature block.
* @param siglen The length of the signature.
* @param data The data that was signed.
* @param datalen The length of the data.
* @param decode Whether or not to base64-decode the signature prior to verification. 1 for yes, 0 for no.
* @return 0 for success, -1 for error or invalid signature.
*/
extern int cl_verify_signature_x509(
X509 *x509,
const char *alg,
unsigned char *sig,
unsigned int siglen,
unsigned char *data,
size_t datalen,
int decode);
/**
* @brief Get an X509 object from memory.
*
* @param data A pointer to a spot in memory that contains the PEM X509 cert.
* @param len The length of the data.
* @return A pointer to the X509 object on success, NULL on error.
*/
extern X509 *cl_get_x509_from_mem(void *data, unsigned int len);
/**
* @brief Validate an X509 certificate chain, with the chain being located in a directory.
*
* @param tsdir The path to the trust store directory.
* @param certpath The path to the X509 certificate to be validated.
* @return 0 for success, -1 for error or invalid certificate.
*/
extern int cl_validate_certificate_chain_ts_dir(char *tsdir, char *certpath);
/**
* @brief Validate an X509 certificate chain with support for a CRL.
*
* @param authorities A NULL-terminated array of strings that hold the path of the CA's X509 certificate.
* @param crlpath (optional) A path to the CRL file. NULL if no CRL.
* @param certpath The path to the X509 certificate to be validated.
* @return 0 for success, -1 for error or invalid certificate.
*/
extern int cl_validate_certificate_chain(char **authorities, char *crlpath, char *certpath);
/**
* @brief Load an X509 certificate from a file.
*
* @param certpath The path to the X509 certificate.
*/
extern X509 *cl_load_cert(const char *certpath);
/**
* @brief Parse an ASN1_TIME object.
*
* @param timeobj The ASN1_TIME object.
* @return A pointer to a (struct tm). Adjusted for time zone and daylight savings time.
*/
extern struct tm *cl_ASN1_GetTimeT(ASN1_TIME *timeobj);
/**
* @brief Load a CRL file into an X509_CRL object.
*
* @param file The path to the CRL.
* @return A pointer to an X509_CRL object or NULL on error.
*/
extern X509_CRL *cl_load_crl(const char *timeobj);
/**
* @brief Sign data with a key stored on disk.
*
* @param keypath The path to the RSA private key.
* @param alg The hash/signature algorithm to use.
* @param hash The hash to sign.
* @param[out] olen A pointer that stores the size of the signature.
* @param Whether or not to base64-encode the signature. 1 for yes, 0 for no.
* @return The generated signature.
*/
extern unsigned char *cl_sign_data_keyfile(
char *keypath,
const char *alg,
unsigned char *hash,
unsigned int *olen,
int encode);
/**
* @brief Sign data with an RSA private key object.
*
* @param pkey The RSA private key object.
* @param alg The hash/signature algorithm to use.
* @param hash The hash to sign.
* @param[out] olen A pointer that stores the size of the signature.
* @param Whether or not to base64-encode the signature. 1 for yes, 0 for no.
* @return The generated signature.
*/
extern unsigned char *cl_sign_data(EVP_PKEY *pkey, const char *alg, unsigned char *hash, unsigned int *olen, int encode);
/**
* @brief Sign a file with an RSA private key object.
*
* @param fd The file descriptor.
* @param pkey The RSA private key object.
* @param alg The hash/signature algorithm to use.
* @param[out] olen A pointer that stores the size of the signature.
* @param encode Whether or not to base64-encode the signature. 1 for yes, 0 for no.
* @return The generated signature.
*/
extern unsigned char *cl_sign_file_fd(int fd, EVP_PKEY *pkey, const char *alg, unsigned int *olen, int encode);
/**
* @brief Sign a file with an RSA private key object.
*
* @param fp A pointer to a FILE object.
* @param pkey The RSA private key object.
* @param alg The hash/signature algorithm to use.
* @param[out] olen A pointer that stores the size of the signature.
* @param encode Whether or not to base64-encode the signature. 1 for yes, 0 for no.
* @return The generated signature.
*/
extern unsigned char *cl_sign_file_fp(FILE *fp, EVP_PKEY *pkey, const char *alg, unsigned int *olen, int encode);
/**
* @brief Get the Private Key stored on disk.
*
* @param keypath The path on disk where the private key is stored.
* @return A pointer to the EVP_PKEY object that contains the private key in memory.
*/
extern EVP_PKEY *cl_get_pkey_file(char *keypath);
#ifdef __cplusplus
}
#endif
#endif /* __CLAMAV_H */