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clamav/clamscan/clamscan.c
Valerie Snyder 13c4788f36
FIPS & FIPS-like limits on hash algs for cryptographic uses 
ClamAV will not function when using a FIPS-enabled OpenSSL 3.x.
This is because ClamAV uses MD5 and SHA1 algorithms for a variety of
purposes including matching for malware detection, matching to prevent
false positives on known-clean files, and for verification of MD5-based
RSA digital signatures for determining CVD (signature database archive)
authenticity.

Interestingly, FIPS had been intentionally bypassed when creating hashes
based whole buffers and whole files (by descriptor or `FILE`-pointer):
78d4a9985a
Note: this bypassed FIPS the 1.x way with:
`EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);`

It was NOT disabled when using `cl_hash_init()` / `cl_update_hash()` /
`cl_finish_hash()`. That likely worked by coincidence in that the hash
was already calculated most of the time. It certainly would have made
use of those functions if the hash had not been calculated prior:
78d4a9985a/libclamav/matcher.c (L743)

Regardless, bypassing FIPS entirely is not the correct solution.
The FIPS restrictions against using MD5 and SHA1 are valid, particularly
when verifying CVD digital siganatures, but also I think when using a
hash to determine if the file is known-clean (i.e. the "clean cache" and
also MD5-based and SHA1-based FP signatures).

This commit extends the work to bypass FIPS using the newer 3.x method:
`md = EVP_MD_fetch(NULL, alg, "-fips");`

It does this for the legacy `cl_hash*()` functions including
`cl_hash_init()` / `cl_update_hash()` / `cl_finish_hash()`.
It also introduces extended versions that allow the caller to choose if
they want to bypass FIPS:
- `cl_hash_data_ex()`
- `cl_hash_init_ex()`
- `cl_update_hash_ex()`
- `cl_finish_hash_ex()`
- `cl_hash_destroy_ex()`
- `cl_hash_file_fd_ex()`
See the `flags` parameter for each.

Ironically, this commit does NOT use the new functions at this time.
The rational is that ClamAV may need MD5, SHA1, and SHA-256 hashes of
the same files both for determining if the file is malware, and for
determining if the file is clean.

So instead, this commit will do a checks when:

1. Creating a new ClamAV scanning engine. If FIPS-mode enabled, it will
   automatically toggle the "FIPS limits" engine option.
   When loading signatures, if the engine "FIPS limits" option is enabled,
   then MD5 and SHA1 FP signatures will be skipped.

2. Before verifying a CVD (e.g. also for loading, unpacking when
   verification enabled).
   If "FIPS limits" or FIPS-mode are enabled, then the legacy MD5-based RSA
   method is disabled.

   Note: This commit also refactors the interface for `cl_cvdverify_ex()`
   and `cl_cvdunpack_ex()` so they take a `flags` parameters, rather than a
   single `bool`. As these functions are new in this version, it does not
   break the ABI.

The cache was already switched to use SHA2-256, so that's not a concern
for checking FIPS-mode / FIPS limits options.

This adds an option for `freshclam.conf` and `clamd.conf`:

   FIPSCryptoHashLimits yes

And an equivalent command-line option for `clamscan` and `sigtool`:

   --fips-limits

You may programmatically enable FIPS-limits for a ClamAV engine like this:
```C
   cl_engine_set_num(engine, CL_ENGINE_FIPS_LIMITS, 1);
```

CLAM-2792
2025-08-14 22:39:15 -04:00

400 lines
22 KiB
C
Raw Blame History

/*
* 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.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <locale.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifndef _WIN32
#include <sys/time.h>
#endif
#include <time.h>
#ifdef C_LINUX
#include <sys/resource.h>
#endif
// libclamav
#include "clamav.h"
#include "others.h"
#include "str.h"
// common
#include "misc.h"
#include "output.h"
#include "actions.h"
#include "optparser.h"
#include "global.h"
#include "manager.h"
void help(void);
struct s_info info;
short recursion = 0, bell = 0;
short printinfected = 0, printclean = 1;
static void loggBytes(uint64_t bytes)
{
if (bytes >= (1024 * 1024 * 1024)) {
logg(LOGG_INFO, "%.02f GiB", bytes / (double)(1024 * 1024 * 1024));
} else if (bytes >= (1024 * 1024)) {
logg(LOGG_INFO, "%.02f MiB", bytes / (double)(1024 * 1024));
} else if (bytes >= 1024) {
logg(LOGG_INFO, "%.02f KiB", bytes / (double)(1024));
} else {
logg(LOGG_INFO, "%" PRIu64 " B", bytes);
}
}
int main(int argc, char **argv)
{
int ds, dms, ret;
struct timeval t1, t2;
time_t date_start, date_end;
char buffer[26];
#ifdef _WIN32
SetConsoleOutputCP(CP_UTF8);
#else /* !_WIN32 */
sigset_t sigset;
#endif
struct optstruct *opts;
const struct optstruct *opt;
if (check_flevel())
exit(2);
#if !defined(_WIN32)
if (!setlocale(LC_CTYPE, "")) {
mprintf(LOGG_WARNING, "Failed to set locale\n");
}
#if !defined(C_BEOS)
sigemptyset(&sigset);
sigaddset(&sigset, SIGXFSZ);
sigprocmask(SIG_SETMASK, &sigset, NULL);
#endif /* !C_BEOS */
#endif /* !_WIN32 */
cl_initialize_crypto();
if ((opts = optparse(NULL, argc, argv, 1, OPT_CLAMSCAN, 0, NULL)) == NULL) {
mprintf(LOGG_ERROR, "Can't parse command line options\n");
return 2;
}
if (optget(opts, "verbose")->enabled) {
mprintf_verbose = 1;
logg_verbose = 1;
}
if (optget(opts, "quiet")->enabled)
mprintf_quiet = 1;
if (optget(opts, "stdout")->enabled)
mprintf_stdout = 1;
if (optget(opts, "debug")->enabled) {
#if defined(C_LINUX)
/* njh@bandsman.co.uk: create a dump if needed */
struct rlimit rlim;
rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
if (setrlimit(RLIMIT_CORE, &rlim) < 0)
perror("setrlimit");
#endif
cl_debug(); /* enable debug messages */
}
if (optget(opts, "gen-mdb")->enabled) {
cl_always_gen_section_hash();
}
if (optget(opts, "version")->enabled) {
print_version(optget(opts, "database")->strarg);
optfree(opts);
return 0;
}
if (optget(opts, "help")->enabled) {
optfree(opts);
help();
return 0;
}
if (optget(opts, "recursive")->enabled)
recursion = 1;
if (optget(opts, "infected")->enabled)
printinfected = 1;
if (optget(opts, "suppress-ok-results")->enabled)
printclean = 0;
if (optget(opts, "bell")->enabled)
bell = 1;
/* initialize logger */
if ((opt = optget(opts, "log"))->enabled) {
logg_file = opt->strarg;
if (logg(LOGG_INFO_NF, "\n-------------------------------------------------------------------------------\n\n")) {
mprintf(LOGG_ERROR, "Problem with internal logger.\n");
optfree(opts);
return 2;
}
} else
logg_file = NULL;
if (actsetup(opts)) {
optfree(opts);
logg_close();
exit(2);
}
memset(&info, 0, sizeof(struct s_info));
date_start = time(NULL);
gettimeofday(&t1, NULL);
ret = scanmanager(opts);
if (!optget(opts, "no-summary")->enabled) {
struct tm tmp;
date_end = time(NULL);
gettimeofday(&t2, NULL);
ds = t2.tv_sec - t1.tv_sec;
dms = t2.tv_usec - t1.tv_usec;
ds -= (dms < 0) ? (1) : (0);
dms += (dms < 0) ? (1000000) : (0);
logg(LOGG_INFO, "\n----------- SCAN SUMMARY -----------\n");
logg(LOGG_INFO, "Known viruses: %u\n", info.sigs);
logg(LOGG_INFO, "Engine version: %s\n", get_version());
logg(LOGG_INFO, "Scanned directories: %u\n", info.dirs);
logg(LOGG_INFO, "Scanned files: %u\n", info.files);
logg(LOGG_INFO, "Infected files: %u\n", info.ifiles);
if (info.errors)
logg(LOGG_INFO, "Total errors: %u\n", info.errors);
if (notremoved) {
logg(LOGG_INFO, "Not removed: %u\n", notremoved);
}
if (notmoved) {
logg(LOGG_INFO, "Not %s: %u\n", optget(opts, "copy")->enabled ? "moved" : "copied", notmoved);
}
logg(LOGG_INFO, "Data scanned: ");
loggBytes(info.bytes_scanned);
logg(LOGG_INFO, "\n");
logg(LOGG_INFO, "Data read: ");
loggBytes(info.bytes_read);
logg(LOGG_INFO, " (ratio %.2f:1)\n", info.bytes_read ? (double)info.bytes_scanned / (double)info.bytes_read : 0);
logg(LOGG_INFO, "Time: %u.%3.3u sec (%u m %u s)\n", ds, dms / 1000, ds / 60, ds % 60);
#ifdef _WIN32
if (0 != localtime_s(&tmp, &date_start)) {
#else
if (!localtime_r(&date_start, &tmp)) {
#endif
logg(LOGG_ERROR, "Failed to get local time for Start Date.\n");
}
strftime(buffer, sizeof(buffer), "%Y:%m:%d %H:%M:%S", &tmp);
logg(LOGG_INFO, "Start Date: %s\n", buffer);
#ifdef _WIN32
if (0 != localtime_s(&tmp, &date_end)) {
#else
if (!localtime_r(&date_end, &tmp)) {
#endif
logg(LOGG_ERROR, "Failed to get local time for End Date.\n");
}
strftime(buffer, sizeof(buffer), "%Y:%m:%d %H:%M:%S", &tmp);
logg(LOGG_INFO, "End Date: %s\n", buffer);
}
optfree(opts);
return ret;
}
void help(void)
{
mprintf_stdout = 1;
mprintf(LOGG_INFO, "\n");
mprintf(LOGG_INFO, " Clam AntiVirus: Scanner %s\n", get_version());
mprintf(LOGG_INFO, " By The ClamAV Team: https://www.clamav.net/about.html#credits\n");
mprintf(LOGG_INFO, " (C) 2025 Cisco Systems, Inc.\n");
mprintf(LOGG_INFO, "\n");
mprintf(LOGG_INFO, " clamscan [options] [file/directory/-]\n");
mprintf(LOGG_INFO, "\n");
mprintf(LOGG_INFO, " --help -h Show this help\n");
mprintf(LOGG_INFO, " --version -V Print version number\n");
mprintf(LOGG_INFO, " --verbose -v Be verbose\n");
mprintf(LOGG_INFO, " --archive-verbose -a Show filenames inside scanned archives\n");
mprintf(LOGG_INFO, " --debug Enable libclamav's debug messages\n");
mprintf(LOGG_INFO, " --quiet Only output error messages\n");
mprintf(LOGG_INFO, " --stdout Write to stdout instead of stderr. Does not affect 'debug' messages.\n");
mprintf(LOGG_INFO, " --no-summary Disable summary at end of scanning\n");
mprintf(LOGG_INFO, " --infected -i Only print infected files\n");
mprintf(LOGG_INFO, " --suppress-ok-results -o Skip printing OK files\n");
mprintf(LOGG_INFO, " --bell Sound bell on virus detection\n");
mprintf(LOGG_INFO, "\n");
mprintf(LOGG_INFO, " --tempdir=DIRECTORY Create temporary files in DIRECTORY\n");
mprintf(LOGG_INFO, " --leave-temps[=yes/no(*)] Do not remove temporary files\n");
mprintf(LOGG_INFO, " --force-to-disk[=yes/no(*)] Create temporary files for nested file scans that would otherwise be in-memory only\n");
mprintf(LOGG_INFO, " --gen-json[=yes/no(*)] Generate JSON metadata for the scanned file(s). For testing & development use ONLY.\n");
mprintf(LOGG_INFO, " JSON will be printed if --debug is enabled.\n");
mprintf(LOGG_INFO, " A JSON file will dropped to the temp directory if --leave-temps is enabled.\n");
mprintf(LOGG_INFO, " --json-store-html-uris[=yes(*)/no] Store html URIs in metadata.\n");
mprintf(LOGG_INFO, " URLs will be written to the metadata.json file in an array called 'URIs'\n");
mprintf(LOGG_INFO, " --json-store-pdf-uris[=yes(*)/no] Store pdf URIs in metadata.\n");
mprintf(LOGG_INFO, " URLs will be written to the metadata.json file in an array called 'URIs'\n");
mprintf(LOGG_INFO, " --database=FILE/DIR -d FILE/DIR Load virus database from FILE or load all supported db files from DIR\n");
mprintf(LOGG_INFO, " --official-db-only[=yes/no(*)] Only load official signatures\n");
mprintf(LOGG_INFO, " --fail-if-cvd-older-than=days Return with a nonzero error code if virus database outdated.\n");
mprintf(LOGG_INFO, " --log=FILE -l FILE Save scan report to FILE\n");
mprintf(LOGG_INFO, " --recursive[=yes/no(*)] -r Scan subdirectories recursively\n");
mprintf(LOGG_INFO, " --allmatch[=yes/no(*)] -z Continue scanning within file after finding a match\n");
mprintf(LOGG_INFO, " --cross-fs[=yes(*)/no] Scan files and directories on other filesystems\n");
mprintf(LOGG_INFO, " --follow-dir-symlinks[=0/1(*)/2] Follow directory symlinks (0 = never, 1 = direct, 2 = always)\n");
mprintf(LOGG_INFO, " --follow-file-symlinks[=0/1(*)/2] Follow file symlinks (0 = never, 1 = direct, 2 = always)\n");
mprintf(LOGG_INFO, " --file-list=FILE -f FILE Scan files from FILE\n");
mprintf(LOGG_INFO, " --remove[=yes/no(*)] Remove infected files. Be careful!\n");
mprintf(LOGG_INFO, " --move=DIRECTORY Move infected files into DIRECTORY\n");
mprintf(LOGG_INFO, " --copy=DIRECTORY Copy infected files into DIRECTORY\n");
mprintf(LOGG_INFO, " --exclude=REGEX Don't scan file names matching REGEX\n");
mprintf(LOGG_INFO, " --exclude-dir=REGEX Don't scan directories matching REGEX\n");
mprintf(LOGG_INFO, " --include=REGEX Only scan file names matching REGEX\n");
mprintf(LOGG_INFO, " --include-dir=REGEX Only scan directories matching REGEX\n");
#ifdef _WIN32
mprintf(LOGG_INFO, " --memory Scan loaded executable modules\n");
mprintf(LOGG_INFO, " --kill Kill/Unload infected loaded modules\n");
mprintf(LOGG_INFO, " --unload Unload infected modules from processes\n");
#endif
mprintf(LOGG_INFO, "\n");
mprintf(LOGG_INFO, " --bytecode[=yes(*)/no] Load bytecode from the database\n");
mprintf(LOGG_INFO, " --bytecode-unsigned[=yes/no(*)] Load unsigned bytecode\n");
mprintf(LOGG_INFO, " **Caution**: You should NEVER run bytecode signatures from untrusted sources.\n");
mprintf(LOGG_INFO, " Doing so may result in arbitrary code execution.\n");
mprintf(LOGG_INFO, " --bytecode-timeout=N Set bytecode timeout (in milliseconds)\n");
mprintf(LOGG_INFO, " --statistics[=none(*)/bytecode/pcre] Collect and print execution statistics\n");
mprintf(LOGG_INFO, " --detect-pua[=yes/no(*)] Detect Possibly Unwanted Applications\n");
mprintf(LOGG_INFO, " --exclude-pua=CAT Skip PUA sigs of category CAT\n");
mprintf(LOGG_INFO, " --include-pua=CAT Load PUA sigs of category CAT\n");
mprintf(LOGG_INFO, " --detect-structured[=yes/no(*)] Detect structured data (SSN, Credit Card)\n");
mprintf(LOGG_INFO, " --structured-ssn-format=X SSN format (0=normal,1=stripped,2=both)\n");
mprintf(LOGG_INFO, " --structured-ssn-count=N Min SSN count to generate a detect\n");
mprintf(LOGG_INFO, " --structured-cc-count=N Min CC count to generate a detect\n");
mprintf(LOGG_INFO, " --structured-cc-mode=X CC mode (0=credit debit and private label, 1=credit cards only\n");
mprintf(LOGG_INFO, " --scan-mail[=yes(*)/no] Scan mail files\n");
mprintf(LOGG_INFO, " --phishing-sigs[=yes(*)/no] Enable email signature-based phishing detection\n");
mprintf(LOGG_INFO, " --phishing-scan-urls[=yes(*)/no] Enable URL signature-based phishing detection\n");
mprintf(LOGG_INFO, " --heuristic-alerts[=yes(*)/no] Heuristic alerts\n");
mprintf(LOGG_INFO, " --heuristic-scan-precedence[=yes/no(*)] Stop scanning as soon as a heuristic match is found\n");
mprintf(LOGG_INFO, " --normalize[=yes(*)/no] Normalize html, script, and text files. Use normalize=no for yara compatibility\n");
mprintf(LOGG_INFO, " --scan-pe[=yes(*)/no] Scan PE files\n");
mprintf(LOGG_INFO, " --scan-elf[=yes(*)/no] Scan ELF files\n");
mprintf(LOGG_INFO, " --scan-ole2[=yes(*)/no] Scan OLE2 containers\n");
mprintf(LOGG_INFO, " --scan-pdf[=yes(*)/no] Scan PDF files\n");
mprintf(LOGG_INFO, " --scan-swf[=yes(*)/no] Scan SWF files\n");
mprintf(LOGG_INFO, " --scan-html[=yes(*)/no] Scan HTML files\n");
mprintf(LOGG_INFO, " --scan-xmldocs[=yes(*)/no] Scan xml-based document files\n");
mprintf(LOGG_INFO, " --scan-hwp3[=yes(*)/no] Scan HWP3 files\n");
mprintf(LOGG_INFO, " --scan-onenote[=yes(*)/no] Scan OneNote files\n");
mprintf(LOGG_INFO, " --scan-archive[=yes(*)/no] Scan archive files (supported by libclamav)\n");
mprintf(LOGG_INFO, " --scan-image[=yes(*)/no] Scan image (graphics) files\n");
mprintf(LOGG_INFO, " --scan-image-fuzzy-hash[=yes(*)/no] Detect files by calculating image (graphics) fuzzy hashes\n");
mprintf(LOGG_INFO, " --alert-broken[=yes/no(*)] Alert on broken executable files (PE & ELF)\n");
mprintf(LOGG_INFO, " --alert-broken-media[=yes/no(*)] Alert on broken graphics files (JPEG, TIFF, PNG, GIF)\n");
mprintf(LOGG_INFO, " --alert-encrypted[=yes/no(*)] Alert on encrypted archives and documents\n");
mprintf(LOGG_INFO, " --alert-encrypted-archive[=yes/no(*)] Alert on encrypted archives\n");
mprintf(LOGG_INFO, " --alert-encrypted-doc[=yes/no(*)] Alert on encrypted documents\n");
mprintf(LOGG_INFO, " --alert-macros[=yes/no(*)] Alert on OLE2 files containing VBA macros\n");
mprintf(LOGG_INFO, " --alert-exceeds-max[=yes/no(*)] Alert on files that exceed max file size, max scan size, or max recursion limit\n");
mprintf(LOGG_INFO, " --alert-phishing-ssl[=yes/no(*)] Alert on emails containing SSL mismatches in URLs\n");
mprintf(LOGG_INFO, " --alert-phishing-cloak[=yes/no(*)] Alert on emails containing cloaked URLs\n");
mprintf(LOGG_INFO, " --alert-partition-intersection[=yes/no(*)] Alert on raw DMG image files containing partition intersections\n");
mprintf(LOGG_INFO, " --nocerts Disable authenticode certificate chain verification in PE files\n");
mprintf(LOGG_INFO, " --dumpcerts Dump authenticode certificate chain in PE files\n");
mprintf(LOGG_INFO, "\n");
mprintf(LOGG_INFO, " --max-scantime=#n Scan time longer than this will be skipped and assumed clean (milliseconds)\n");
mprintf(LOGG_INFO, " --max-filesize=#n Files larger than this will be skipped and assumed clean\n");
mprintf(LOGG_INFO, " --max-scansize=#n The maximum amount of data to scan for each container file (**)\n");
mprintf(LOGG_INFO, " --max-files=#n The maximum number of files to scan for each container file (**)\n");
mprintf(LOGG_INFO, " --max-recursion=#n Maximum archive recursion level for container file (**)\n");
mprintf(LOGG_INFO, " --max-dir-recursion=#n Maximum directory recursion level\n");
mprintf(LOGG_INFO, " --max-embeddedpe=#n Maximum size file to check for embedded PE\n");
mprintf(LOGG_INFO, " --max-htmlnormalize=#n Maximum size of HTML file to normalize\n");
mprintf(LOGG_INFO, " --max-htmlnotags=#n Maximum size of normalized HTML file to scan\n");
mprintf(LOGG_INFO, " --max-scriptnormalize=#n Maximum size of script file to normalize\n");
mprintf(LOGG_INFO, " --max-ziptypercg=#n Maximum size zip to type reanalyze\n");
mprintf(LOGG_INFO, " --max-partitions=#n Maximum number of partitions in disk image to be scanned\n");
mprintf(LOGG_INFO, " --max-iconspe=#n Maximum number of icons in PE file to be scanned\n");
mprintf(LOGG_INFO, " --max-rechwp3=#n Maximum recursive calls to HWP3 parsing function\n");
mprintf(LOGG_INFO, " --pcre-match-limit=#n Maximum calls to the PCRE match function.\n");
mprintf(LOGG_INFO, " --pcre-recmatch-limit=#n Maximum recursive calls to the PCRE match function.\n");
mprintf(LOGG_INFO, " --pcre-max-filesize=#n Maximum size file to perform PCRE subsig matching.\n");
mprintf(LOGG_INFO, " --disable-cache Disable caching and cache checks for hash sums of scanned files.\n");
mprintf(LOGG_INFO, " --hash-hint The file hash so that libclamav does not need to calculate it.\n");
mprintf(LOGG_INFO, " The type of hash must match the '--hash-alg'.\n");
mprintf(LOGG_INFO, " --log-hash Print the file hash after each file scanned.\n");
mprintf(LOGG_INFO, " The type of hash printed will match the '--hash-alg'.\n");
mprintf(LOGG_INFO, " --hash-alg The hashing algorithm used for either '--hash-hint' or '--log-hash'.\n");
mprintf(LOGG_INFO, " Supported algorithms are 'md5', 'sha1', 'sha2-256'.\n");
mprintf(LOGG_INFO, " If not specified, the default is 'sha2-256'.\n");
mprintf(LOGG_INFO, " --file-type-hint The file type hint so that libclamav can optimize scanning.\n");
mprintf(LOGG_INFO, " E.g. 'pe', 'elf', 'zip', etc.\n");
mprintf(LOGG_INFO, " You may also use ClamAV type names such as 'CL_TYPE_PE'.\n");
mprintf(LOGG_INFO, " ClamAV will ignore the hint if it is not familiar with the specified type.\n");
mprintf(LOGG_INFO, " See also: https://docs.clamav.net/appendix/FileTypes.html#file-types\n");
mprintf(LOGG_INFO, " --log-file-type Print the file type after each file scanned.\n");
mprintf(LOGG_INFO, " --cvdcertsdir=DIRECTORY Specify a directory containing the root\n");
mprintf(LOGG_INFO, " CA cert needed to verify detached CVD digital signatures.\n");
mprintf(LOGG_INFO, " If not provided, then clamscan will look in the default directory.\n");
mprintf(LOGG_INFO, " --fips-limits Enforce FIPS-like limits on using hash algorithms for\n");
mprintf(LOGG_INFO, " cryptographic purposes. Will disable MD5 & SHA1\n");
mprintf(LOGG_INFO, " FP sigs and will require '.sign' files to verify CVD\n");
mprintf(LOGG_INFO, " authenticity.\n");
mprintf(LOGG_INFO, "\n");
mprintf(LOGG_INFO, "Environment Variables:\n");
mprintf(LOGG_INFO, "\n");
mprintf(LOGG_INFO, " LD_LIBRARY_PATH May be used on startup to find the libclamunrar_iface\n");
mprintf(LOGG_INFO, " shared library module to enable RAR archive support.\n");
mprintf(LOGG_INFO, " CVD_CERTS_DIR Specify a directory containing the root CA cert needed\n");
mprintf(LOGG_INFO, " to verify detached CVD digital signatures.\n");
mprintf(LOGG_INFO, " If not provided, then clamscan will look in the default directory.\n");
mprintf(LOGG_INFO, "\n");
mprintf(LOGG_INFO, "Pass in - as the filename for stdin.\n");
mprintf(LOGG_INFO, "\n");
mprintf(LOGG_INFO, "(*) Default scan settings\n");
mprintf(LOGG_INFO, "(**) Certain files (e.g. documents, archives, etc.) may in turn contain other\n");
mprintf(LOGG_INFO, " files inside. The above options ensure safe processing of this kind of data.\n\n");
}
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