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clamav/win32/conf_examples/clamd.conf.sample
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

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##
## Example config file for the Clam AV daemon
## Please read the clamd.conf(5) manual before editing this file.
##
# Comment or remove the line below.
Example
# Uncomment this option to enable logging.
# LogFile must be writable for the user running daemon.
# A full path is required.
# Default: disabled
#LogFile "C:\Program Files\ClamAV\clamd.log"
# By default the log file is locked for writing - the lock protects against
# running clamd multiple times (if want to run another clamd, please
# copy the configuration file, change the LogFile variable, and run
# the daemon with --config-file option).
# This option disables log file locking.
# Default: no
#LogFileUnlock yes
# Maximum size of the log file.
# Value of 0 disables the limit.
# You may use 'M' or 'm' for megabytes (1M = 1m = 1048576 bytes)
# and 'K' or 'k' for kilobytes (1K = 1k = 1024 bytes). To specify the size
# in bytes just don't use modifiers. If LogFileMaxSize is enabled, log
# rotation (the LogRotate option) will always be enabled.
# Default: 1M
#LogFileMaxSize 2M
# Log time with each message.
# Default: no
#LogTime yes
# Also log clean files. Useful in debugging but drastically increases the
# log size.
# Default: no
#LogClean yes
# Enable verbose logging.
# Default: no
#LogVerbose yes
# Enable log rotation. Always enabled when LogFileMaxSize is enabled.
# Default: no
#LogRotate yes
# Enable Prelude output.
# Default: no
#PreludeEnable yes
#
# Set the name of the analyzer used by prelude-admin.
# Default: ClamAV
#PreludeAnalyzerName ClamAV
# Log additional information about the infected file, such as its
# size and hash, together with the virus name.
#ExtendedDetectionInfo yes
# This option allows you to save a process identifier of the listening
# daemon.
# Default: disabled
#PidFile "C:\Program Files\ClamAV\clamd.pid"
# Optional path to the global temporary directory.
# Default: system specific (usually /tmp or /var/tmp).
#TemporaryDirectory "C:\temp"
# Path to the database directory.
# Default: hardcoded (depends on installation options)
#DatabaseDirectory "C:\Program Files\ClamAV\database"
# Path to the ClamAV CA certificates directory for verifying CVD signature
# archive digital signatures.
# Default: "certs"
#CVDCertsDirectory "C:\Program Files\ClamAV\certs"
# Enforce FIPS-like limits on using hash algorithms for cryptographic purposes.
# Will disable MD5 & SHA1 FP sigs and will require '.sign' files to verify
# CVD authenticity.
# Default: no
#FIPSCryptoHashLimits yes
# Only load the official signatures published by the ClamAV project.
# Default: no
#OfficialDatabaseOnly no
# Return with a nonzero error code if the virus database is older than
# the specified number of days.
# Default: -1
#FailIfCvdOlderThan 7
# The daemon on Windows only supports unsecured TCP sockets.
# Due to security reasons make sure that your IP & port is not
# exposed to the open internet.
# TCP port address.
# Default: no
TCPSocket 3310
# TCP address.
# By default we bind to INADDR_ANY, probably not wise.
# Enable the following to provide some degree of protection
# from the outside world. This option can be specified multiple
# times if you want to listen on multiple IPs. IPv6 is now supported.
# Default: no
TCPAddr localhost
# Enable or disable certain commands.
# Disabling some commands like SHUTDOWN may improve the security of the daemon.
# When a client sends one of the following commands but it is disabled,
# clamd responds with COMMAND UNAVAILABLE.
#
# Enable the SHUTDOWN command.
# Setting this to no prevents a client to stop clamd via the protocol.
# Default: yes
#EnableShutdownCommand no
#
# Enable the RELOAD command
# Setting this to no prevents a client to reload the database.
# Default: yes
#EnableReloadCommand no
#
# Enable the STATS command
# Setting this to no prevents a client from querying statistics.
# Default: yes
#EnableStatsCommand no
#
# Enable the VERSION command
# Setting this to no prevents a client from querying version information.
# Default: yes
#EnableVersionCommand no
# Maximum length the queue of pending connections may grow to.
# Default: 200
#MaxConnectionQueueLength 30
# Clamd uses FTP-like protocol to receive data from remote clients.
# If you are using clamav-milter to balance load between remote clamd daemons
# on firewall servers you may need to tune the options below.
# Close the connection when the data size limit is exceeded.
# The value should match your MTA's limit for a maximum attachment size.
# Default: 100M
#StreamMaxLength 25M
# Limit port range.
# Default: 1024
#StreamMinPort 30000
# Default: 2048
#StreamMaxPort 32000
# Maximum number of threads running at the same time.
# Default: 10
#MaxThreads 20
# Waiting for data from a client socket will timeout after this time (seconds).
# Default: 120
#ReadTimeout 300
# This option specifies the time (in seconds) after which clamd should
# timeout if a client doesn't provide any initial command after connecting.
# Default: 30
#CommandReadTimeout 30
# This option specifies how long to wait (in milliseconds) if the send buffer
# is full.
# Keep this value low to prevent clamd hanging.
#
# Default: 500
#SendBufTimeout 200
# Maximum number of queued items (including those being processed by
# MaxThreads threads).
# It is recommended to have this value at least twice MaxThreads if possible.
# WARNING: you shouldn't increase this too much to avoid running out of file
# descriptors, the following condition should hold:
# MaxThreads*MaxRecursion + (MaxQueue - MaxThreads) + 6< RLIMIT_NOFILE (usual
# max is 1024).
#
# Default: 100
#MaxQueue 200
# Waiting for a new job will timeout after this time (seconds).
# Default: 30
#IdleTimeout 60
# Don't scan files and directories matching regex
# This directive can be used multiple times
# Default: scan all
#ExcludePath "C:\temp"
#ExcludePath "C:\Windows"
# Maximum depth directories are scanned at.
# Default: 15
#MaxDirectoryRecursion 20
# Follow directory symlinks.
# Default: no
#FollowDirectorySymlinks yes
# Follow regular file symlinks.
# Default: no
#FollowFileSymlinks yes
# Scan files and directories on other filesystems.
# Default: yes
#CrossFilesystems no
# Perform a database check.
# Default: 600 (10 min)
#SelfCheck 600
# Enable non-blocking (multi-threaded/concurrent) database reloads.
# This feature will temporarily load a second scanning engine while scanning
# continues using the first engine. Once loaded, the new engine takes over.
# The old engine is removed as soon as all scans using the old engine have
# completed.
# This feature requires more RAM, so this option is provided in case users are
# willing to block scans during reload in exchange for lower RAM requirements.
# Default: yes
#ConcurrentDatabaseReload no
# Execute a command when virus is found.
# Use the following environment variables to identify the file and virus names:
# - $CLAM_VIRUSEVENT_FILENAME
# - $CLAM_VIRUSEVENT_VIRUSNAME
# In the command string, '%v' will also be replaced with the virus name.
# Note: The '%f' filename format character has been disabled and will no longer
# be replaced with the file name, due to command injection security concerns.
# Use the 'CLAM_VIRUSEVENT_FILENAME' environment variable instead.
# For the same reason, you should NOT use the environment variables in the
# command directly, but should use it carefully from your executed script.
# Default: no
#VirusEvent "C:\example\SendVirusAlertEmail.ps1"
# Run as another user (clamd must be started by root for this option to work)
# Default: don't drop privileges
#User clamav
# Stop daemon when libclamav reports out of memory condition.
#ExitOnOOM yes
# Don't fork into background.
# Default: no
#Foreground yes
# Enable debug messages in libclamav.
# Default: no
#Debug yes
# Do not remove temporary files (for debug purposes).
# Default: no
#LeaveTemporaryFiles yes
# Record metadata about the file being scanned.
# Scan metadata is useful for file analysis purposes and for debugging scan behavior.
# The JSON metadata will be printed after the scan is complete if Debug is enabled.
# A metadata.json file will be written to the scan temp directory if LeaveTemporaryFiles is enabled.
# Default: no
#GenerateMetadataJson yes
# Store URIs found in html files to the json metadata.
# URIs will be stored in an array with the tag 'URIs'
# GenerateMetadataJson is required for this feature.
# Default: yes (if GenerateMetadataJson is used)
#JsonStoreHTMLURIs no
# Store URIs found in pdf files to the json metadata.
# URIs will be stored in an array with the tag 'URIs'
# GenerateMetadataJson is required for this feature.
# Default: yes (if GenerateMetadataJson is used)
#JsonStorePDFURIs no
# Calculate MD5 and SHA1 hashes (in addition to SHA2-256) and store to the json metadata.
# GenerateMetadataJson is required for this feature.
# Default: no
#JsonStoreExtraHashes yes
# Permit use of the ALLMATCHSCAN command. If set to no, clamd will reject
# any ALLMATCHSCAN command as invalid.
# Default: yes
#AllowAllMatchScan no
# Detect Possibly Unwanted Applications.
# Default: no
#DetectPUA yes
# Exclude a specific PUA category. This directive can be used multiple times.
# See https://github.com/vrtadmin/clamav-faq/blob/master/faq/faq-pua.md for
# the complete list of PUA categories.
# Default: Load all categories (if DetectPUA is activated)
#ExcludePUA NetTool
#ExcludePUA PWTool
# Only include a specific PUA category. This directive can be used multiple
# times.
# Default: Load all categories (if DetectPUA is activated)
#IncludePUA Spy
#IncludePUA Scanner
#IncludePUA RAT
# This option causes memory or nested map scans to dump the content to disk.
# If you turn on this option, more data is written to disk and is available
# when the LeaveTemporaryFiles option is enabled.
#ForceToDisk yes
# This option allows you to disable the caching feature of the engine. By
# default, the engine will store an MD5 in a cache of any files that are
# not flagged as virus or that hit limits checks. Disabling the cache will
# have a negative performance impact on large scans.
# Default: no
#DisableCache yes
# This option allows you to set the number of entries the cache can store.
# The value should be a square number or will be rounded up to the nearest
# square number.
#CacheSize 65536
# In some cases (eg. complex malware, exploits in graphic files, and others),
# ClamAV uses special algorithms to detect abnormal patterns and behaviors that
# may be malicious. This option enables alerting on such heuristically
# detected potential threats.
# Default: yes
#HeuristicAlerts no
# Allow heuristic alerts to take precedence.
# When enabled, if a heuristic scan (such as phishingScan) detects
# a possible virus/phish it will stop scan immediately. Recommended, saves CPU
# scan-time.
# When disabled, virus/phish detected by heuristic scans will be reported only
# at the end of a scan. If an archive contains both a heuristically detected
# virus/phish, and a real malware, the real malware will be reported
#
# Keep this disabled if you intend to handle "*.Heuristics.*" viruses
# differently from "real" malware.
# If a non-heuristically-detected virus (signature-based) is found first,
# the scan is interrupted immediately, regardless of this config option.
#
# Default: no
#HeuristicScanPrecedence yes
##
## Heuristic Alerts
##
# With this option clamav will try to detect broken executables (both PE and
# ELF) and alert on them with the Broken.Executable heuristic signature.
# Default: no
#AlertBrokenExecutables yes
# With this option clamav will try to detect broken media file (JPEG,
# TIFF, PNG, GIF) and alert on them with a Broken.Media heuristic signature.
# Default: no
#AlertBrokenMedia yes
# Alert on encrypted archives _and_ documents with heuristic signature
# (encrypted .zip, .7zip, .rar, .pdf).
# Default: no
#AlertEncrypted yes
# Alert on encrypted archives with heuristic signature (encrypted .zip, .7zip,
# .rar).
# Default: no
#AlertEncryptedArchive yes
# Alert on encrypted archives with heuristic signature (encrypted .pdf).
# Default: no
#AlertEncryptedDoc yes
# With this option enabled OLE2 files containing VBA macros, which were not
# detected by signatures will be marked as "Heuristics.OLE2.ContainsMacros".
# Default: no
#AlertOLE2Macros yes
# Alert on SSL mismatches in URLs, even if the URL isn't in the database.
# This can lead to false positives.
# Default: no
#AlertPhishingSSLMismatch yes
# Alert on cloaked URLs, even if URL isn't in database.
# This can lead to false positives.
# Default: no
#AlertPhishingCloak yes
# Alert on raw DMG image files containing partition intersections.
# Default: no
#PartitionIntersection yes
##
## Executable files
##
# PE stands for Portable Executable - it's an executable file format used
# in all 32 and 64-bit versions of Windows operating systems. This option
# allows ClamAV to perform a deeper analysis of executable files and it's also
# required for decompression of popular executable packers such as UPX, FSG,
# and Petite. If you turn off this option, the original files will still be
# scanned, but without additional processing.
# Default: yes
#ScanPE no
# Certain PE files contain an authenticode signature. By default, we check
# the signature chain in the PE file against a database of trusted and
# revoked certificates if the file being scanned is marked as a virus.
# If any certificate in the chain validates against any trusted root, but
# does not match any revoked certificate, the file is marked as trusted.
# If the file does match a revoked certificate, the file is marked as virus.
# The following setting completely turns off authenticode verification.
# Default: no
#DisableCertCheck yes
# Executable and Linking Format is a standard format for UN*X executables.
# This option allows you to control the scanning of ELF files.
# If you turn off this option, the original files will still be scanned, but
# without additional processing.
# Default: yes
#ScanELF no
##
## Documents
##
# This option enables scanning of OLE2 files, such as Microsoft Office
# documents and .msi files.
# If you turn off this option, the original files will still be scanned, but
# without additional processing.
# Default: yes
#ScanOLE2 no
# This option enables scanning within PDF files.
# If you turn off this option, the original files will still be scanned, but
# without decoding and additional processing.
# Default: yes
#ScanPDF no
# This option enables scanning within SWF files.
# If you turn off this option, the original files will still be scanned, but
# without decoding and additional processing.
# Default: yes
#ScanSWF no
# This option enables scanning xml-based document files supported by libclamav.
# If you turn off this option, the original files will still be scanned, but
# without additional processing.
# Default: yes
#ScanXMLDOCS no
# This option enables scanning of HWP3 files.
# If you turn off this option, the original files will still be scanned, but
# without additional processing.
# Default: yes
#ScanHWP3 no
# This option enables scanning of OneNote files.
# If you turn off this option, the original files will still be scanned, but
# without additional processing.
# Default: yes
#ScanOneNote no
##
## Other file types
##
# This option enables scanning of image (graphics).
# If you turn off this option, the original files will still be scanned, but
# without additional processing.
# Default: yes
#ScanImage no
# This option enables detection by calculating a fuzzy hash of image (graphics)
# files.
# Signatures using image fuzzy hashes typically match files and documents by
# identifying images embedded or attached to those files.
# If you turn off this option, then some files may no longer be detected.
# Default: yes
#ScanImageFuzzyHash no
##
## Mail files
##
# Enable internal e-mail scanner.
# If you turn off this option, the original files will still be scanned, but
# without parsing individual messages/attachments.
# Default: yes
#ScanMail no
# Scan RFC1341 messages split over many emails.
# You will need to periodically clean up $TemporaryDirectory/clamav-partial
# directory.
# WARNING: This option may open your system to a DoS attack.
# Never use it on loaded servers.
# Default: no
#ScanPartialMessages yes
# With this option enabled ClamAV will try to detect phishing attempts by using
# HTML.Phishing and Email.Phishing NDB signatures.
# Default: yes
#PhishingSignatures no
# With this option enabled ClamAV will try to detect phishing attempts by
# analyzing URLs found in emails using WDB and PDB signature databases.
# Default: yes
#PhishingScanURLs no
##
## Data Loss Prevention (DLP)
##
# Enable the DLP module
# Default: No
#StructuredDataDetection yes
# This option sets the lowest number of Credit Card numbers found in a file
# to generate a detect.
# Default: 3
#StructuredMinCreditCardCount 5
# With this option enabled the DLP module will search for valid Credit Card
# numbers only. Debit and Private Label cards will not be searched.
# Default: no
#StructuredCCOnly yes
# This option sets the lowest number of Social Security Numbers found
# in a file to generate a detect.
# Default: 3
#StructuredMinSSNCount 5
# With this option enabled the DLP module will search for valid
# SSNs formatted as xxx-yy-zzzz
# Default: yes
#StructuredSSNFormatNormal no
# With this option enabled the DLP module will search for valid
# SSNs formatted as xxxyyzzzz
# Default: no
#StructuredSSNFormatStripped yes
##
## HTML
##
# Perform HTML normalisation and decryption of MS Script Encoder code.
# Default: yes
# If you turn off this option, the original files will still be scanned, but
# without additional processing.
#ScanHTML no
##
## Archives
##
# ClamAV can scan within archives and compressed files.
# If you turn off this option, the original files will still be scanned, but
# without unpacking and additional processing.
# Default: yes
#ScanArchive no
##
## Limits
##
# The options below protect your system against Denial of Service attacks
# using archive bombs.
# This option sets the maximum amount of time to a scan may take.
# In this version, this field only affects the scan time of ZIP archives.
# Value of 0 disables the limit.
# Note: disabling this limit or setting it too high may result allow scanning
# of certain files to lock up the scanning process/threads resulting in a
# Denial of Service.
# Time is in milliseconds.
# Default: 120000
#MaxScanTime 300000
# This option sets the maximum amount of data to be scanned for each input
# file. Archives and other containers are recursively extracted and scanned
# up to this value.
# Value of 0 disables the limit
# Note: disabling this limit or setting it too high may result in severe damage
# to the system.
# Default: 400M
#MaxScanSize 1000M
# Files larger than this limit won't be scanned. Affects the input file itself
# as well as files contained inside it (when the input file is an archive, a
# document or some other kind of container).
# Value of 0 disables the limit.
# Note: disabling this limit or setting it too high may result in severe damage
# to the system.
# Technical design limitations prevent ClamAV from scanning files greater than
# 2 GB at this time.
# Default: 100M
#MaxFileSize 400M
# Nested archives are scanned recursively, e.g. if a Zip archive contains a RAR
# file, all files within it will also be scanned. This options specifies how
# deeply the process should be continued.
# Note: setting this limit too high may result in severe damage to the system.
# Default: 17
# Maximum: 100
#MaxRecursion 10
# Number of files to be scanned within an archive, a document, or any other
# container file.
# Value of 0 disables the limit.
# Note: disabling this limit or setting it too high may result in severe damage
# to the system.
# Default: 10000
#MaxFiles 15000
# Maximum size of a file to check for embedded PE. Files larger than this value
# will skip the additional analysis step.
# Note: disabling this limit or setting it too high may result in severe damage
# to the system.
# Default: 40M
#MaxEmbeddedPE 100M
# Maximum size of a HTML file to normalize. HTML files larger than this value
# will not be normalized or scanned.
# Note: disabling this limit or setting it too high may result in severe damage
# to the system.
# Default: 40M
#MaxHTMLNormalize 100M
# Maximum size of a normalized HTML file to scan. HTML files larger than this
# value after normalization will not be scanned.
# Note: disabling this limit or setting it too high may result in severe damage
# to the system.
# Default: 8M
#MaxHTMLNoTags 16M
# Maximum size of a script file to normalize. Script content larger than this
# value will not be normalized or scanned.
# Note: disabling this limit or setting it too high may result in severe damage
# to the system.
# Default: 20M
#MaxScriptNormalize 50M
# Maximum size of a ZIP file to reanalyze type recognition. ZIP files larger
# than this value will skip the step to potentially reanalyze as PE.
# Note: disabling this limit or setting it too high may result in severe damage
# to the system.
# Default: 1M
#MaxZipTypeRcg 1M
# This option sets the maximum number of partitions of a raw disk image to be
# scanned.
# Raw disk images with more partitions than this value will have up to
# the value number partitions scanned. Negative values are not allowed.
# Note: setting this limit too high may result in severe damage or impact
# performance.
# Default: 50
#MaxPartitions 128
# This option sets the maximum number of icons within a PE to be scanned.
# PE files with more icons than this value will have up to the value number
# icons scanned.
# Negative values are not allowed.
# WARNING: setting this limit too high may result in severe damage or impact
# performance.
# Default: 100
#MaxIconsPE 200
# This option sets the maximum recursive calls for HWP3 parsing during
# scanning. HWP3 files using more than this limit will be terminated and
# alert the user.
# Scans will be unable to scan any HWP3 attachments if the recursive limit
# is reached.
# Negative values are not allowed.
# WARNING: setting this limit too high may result in severe damage or impact
# performance.
# Default: 16
#MaxRecHWP3 16
# This option sets the maximum calls to the PCRE match function during
# an instance of regex matching.
# Instances using more than this limit will be terminated and alert the user
# but the scan will continue.
# For more information on match_limit, see the PCRE documentation.
# Negative values are not allowed.
# WARNING: setting this limit too high may severely impact performance.
# Default: 100000
#PCREMatchLimit 20000
# This option sets the maximum recursive calls to the PCRE match function
# during an instance of regex matching.
# Instances using more than this limit will be terminated and alert the user
# but the scan will continue.
# For more information on match_limit_recursion, see the PCRE documentation.
# Negative values are not allowed and values > PCREMatchLimit are superfluous.
# WARNING: setting this limit too high may severely impact performance.
# Default: 2000
#PCRERecMatchLimit 10000
# This option sets the maximum filesize for which PCRE subsigs will be
# executed. Files exceeding this limit will not have PCRE subsigs executed
# unless a subsig is encompassed to a smaller buffer.
# Negative values are not allowed.
# Setting this value to zero disables the limit.
# WARNING: setting this limit too high or disabling it may severely impact
# performance.
# Default: 100M
#PCREMaxFileSize 400M
# When AlertExceedsMax is set, files exceeding the MaxFileSize, MaxScanSize, or
# MaxRecursion limit will be flagged with the virus name starting with
# "Heuristics.Limits.Exceeded".
# Default: no
#AlertExceedsMax yes
##
## Bytecode
##
# With this option enabled ClamAV will load bytecode from the database.
# It is highly recommended you keep this option on, otherwise you'll miss
# detections for many new viruses.
# Default: yes
#Bytecode no
# Set bytecode security level.
# Possible values:
# None - No security at all, meant for debugging.
# DO NOT USE THIS ON PRODUCTION SYSTEMS.
# This value is only available if clamav was built
# with --enable-debug!
# TrustSigned - Trust bytecode loaded from signed .c[lv]d files, insert
# runtime safety checks for bytecode loaded from other sources.
# Paranoid - Don't trust any bytecode, insert runtime checks for all.
# Recommended: TrustSigned, because bytecode in .cvd files already has these
# checks.
# Note that by default only signed bytecode is loaded, currently you can only
# load unsigned bytecode in --enable-debug mode.
#
# Default: TrustSigned
#BytecodeSecurity TrustSigned
# Allow loading bytecode from outside digitally signed .c[lv]d files.
# **Caution**: You should NEVER run bytecode signatures from untrusted sources.
# Doing so may result in arbitrary code execution.
# Default: no
#BytecodeUnsigned yes
# Set bytecode timeout in milliseconds.
#
# Default: 10000
# BytecodeTimeout 1000
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