aide.conf

NAME

SYNOPSIS

FILE FORMAT

CONFIG OPTIONS

database_in (type: URL, default: see --version output, added in AIDE v0.17)

database (DEPRECATED since AIDE v0.17, will be removed in AIDE v0.19) The url from which database is read. There can only be one of these lines. If there are multiple database lines then the first is used.

database_in=file:/var/lib/aide/aide.db

database_in=stdin

database_in=https://example.com/aide.db

database_out (type: URL, default: see --version output)

The url to which the new database is written to. There can only be one of these lines. If there are multiple database_out lines then the first is used.

database_new (type: URL, default: <none>)

The url from which the other database for --compare is read.

database_attrs (type: attribute expression, default: H, added in AIDE v0.16)

The attributes of the (uncompressed) database files which are to be added to the reports in report level >= database_attributes . Only checksum attributes are supported. To disable set database_attrs to 'E'.

database_add_metadata (type: bool, default: true, added in AIDE v0.16)

Whether to add the AIDE version and the time of database generation as comments to the database file or not. This option may be set to false by default in a future release.

log_level (type: log level, default: warning, added in AIDE v0.17)

The log level to use. Log messages are written to stderr. If there are multiple log_level lines then the first one is used. The --log-level or -L command line option overwrites this option.

verbose (type: number, range: 0 - 255, default: 5, REMOVED in AIDE v0.17)

Removed, use log_level and report_level options instead.

gzip_dbout (type: bool, default: false)

Whether the output to the database is gzipped or not. This option is available only if zlib support is compiled in.

root_prefix (type: path, default: <empty>, added in AIDE v0.16)

The prefix to strip from each file name in the file system before applying the rules and writing to database. AIDE removes a trailing slash from the prefix. If there are multiple root_prefix lines then the first one is used. This option has no effect in compare mode.

acl_no_symlink_follow (type: bool, default: false)

Whether to check ACLs for symlinks or not. This option is available only if acl support is compiled in.

warn_dead_symlinks (type: path, default: false)

Whether to warn about dead symlinks or not.

config_version (type: string, default: <empty>)

The value of config_version is printed in the report and also printed to the database. This is for informational purposes only. It has no other functionality.

config_check_warn_unrestricted_rules (type: bool, default: false, added in AIDE v0.18)

Whether to warn on unrestricted rules during config check. To explicitly define unrestricted rules use 0 (zero) as restriction character.

num_workers (type: number|percentage, default: 1, added in AIDE v0.18)

Specifies the number of simultaneous workers (threads) for file attribute processing (i.a. hashsum calculation). The number of workers can be a positive integer (e.g. '4') or the percentage of the available processors (e.g. '60%'). The resulting number of workers is rounded up to the next integer (e.g. '60%' of 8 processors results in 5 workers). If there are multiple num_workers lines then the first one is used. Use 0 (zero) to disable multi-threading. The default value 1 (single worker thread) may be changed in a future release.

REPORT OPTIONS

report_url (type: URL, default: stdout)

The URL that the output is written to. Multiple instances of the report_url option are supported.

report_url=file:/var/log/aide.log

report_url=stdout

report_url=syslog:<LOG_FACILITY>

report_level (type: report level, default: changed_attributes, added in AIDE v0.17)

The report level to use. The available report levels are as follows:

File: /var/lib/apt/extended_states
 Perm      : -rw-r--r--                       | -rw-------
 Uid       : 0                                | 106

report_format (type: report format, default: plain, added in AIDE v0.18)

The report format to use. The available report formats are as follows:

report_base16 (type: bool, default: false, added in AIDE v0.17)

Base16 encode the checksums in the report. The default is to report checksums in base64 encoding.

report_detailed_init (type: bool, default: false, added in AIDE v0.16)

Report added files (report level >= list_entries) and their details (report level >= added_removed_entries) in initialization mode.

report_quiet (type: bool, default: false, added in AIDE v0.16)

Suppress report output if no differences to the database have been found.

report_append (type: bool, default: false, added in AIDE v0.17)

Append to the report URL.

report_grouped (type: bool, default: true, added in AIDE v0.17)

grouped (DEPRECATED since AIDE v0.17, will be removed in AIDE v0.19) Group the files in the report by added, removed and changed files.

report_summarize_changes (type: bool, default: true, added in AIDE v0.17)

summarize_changes (DEPRECATED since AIDE v0.17, will be removed in AIDE v0.19) Summarize changes in the added, removed and changed files sections of the report. The general format is like the string YlZbpugamcinHAXSEC, where Y is replaced by the file-type (' f' for a regular file, 'd' for a directory, ' l' for a symbolic link, 'c' for a character device, ' b' for a block device, 'p' for a FIFO, 's' for a unix socket, ' D' for a Solaris door, 'P' for a Solaris event port, ' !' if file type has changed and '?' otherwise). The Z is replaced as follows: A ' =' means that the size has not changed, a ' <' reports a shrinked size and a '>' reports a grown size. The other letters in the string are the actual letters that will be output if the associated attribute for the item has been changed or a ' .' for no change. Otherwise a ' +' is shown if the attribute has been added, a '-' if it has been removed, a ' :' if the attribute is ignored (but not forced) or a ' ' if the attribute has not been checked. The exceptions to this are: (1) a newly created file replaces each letter with a ' +', and (2) a removed file replaces each letter with a '-'. The attribute that is associated with each letter is as follows:

report_ignore_added_attrs (type: attribute expression, default: empty, added in AIDE v0.16)

Attributes whose addition is to be ignored in the report.

report_ignore_removed_attrs (type: attribute expression, default: empty, added in AIDE v0.16)

Attributes whose removal is to be ignored in the report.

report_ignore_changed_attrs (type: attribute expression, default: empty, added in AIDE v0.16)

ignore_list (REMOVED in AIDE v0.17) Attributes whose change is to be ignored in the report.

report_force_attrs (type: attribute expression, default: empty, added in AIDE v0.16)

report_attributes (REMOVED in AIDE v0.17) Attributes which are always printed in the report for changed files. If an attribute is both ignored and forced the attribute is not considered for file change but printed in the final report as long as the file has been otherwise changed.

report_ignore_e2fsattrs (type: string, default: 0, added in AIDE v0.16)

List (no delimiter) of ext2 file attributes which are to be ignored in the report. See chattr(1) for the available attributes. Use 0 (zero) to not ignore any attribute. Ignored attributes are represented by a ':' in the report. By default AIDE also reports changes of the read-only attributes mentioned in chattr(1) (see example below how to ignore those changes).

report_ignore_e2fsattrs=VNIE

GROUPS

R

p+ftype+i+l+n+u+g+s+m+c+md5+X

L

p+ftype+i+l+n+u+g+X

>

Growing file p+ftype+l+u+g+i+n+s+growing+X

H

all compiled in hashsums (added in AIDE v0.17)

X

acl+selinux+xattrs+e2fsattrs+caps (if attributes are compiled in, added in AIDE v0.16)

E

Empty group

Use 'aide --version' to list the default compound groups.

RULES

Regular rule:

<regex> <attribute expression> Files and directories matching the regular expression are added to the database.

Negative rule:

!<regex> Files and directories matching the regular expression are ignored and not added to the database. The children of matching directories are also ignored.

Equals rule:

=<regex> <attribute expression> Files and directories matching the regular expression are added to the database. The children of directories are only added if the regular expression ends with a "/". The children of sub-directories are not added at all.

RESTRICTED RULES

f

restrict rule to regular files

d

restrict rule to directories

l

restrict rule to symbolic links

c

restrict rule to character devices

b

restrict rule to block devices

p

restrict rule to FIFO files

s

restrict rule to UNIX sockets

D

restrict rule to Solaris doors

P

restrict rule to Solaris event ports

0

empty restriction, i.e. don't restrict rule (added in AIDE v0.18)

Restricted regular rule

<regex> <file types> <attribute expression>

Restricted negative rule

!<regex> <file types>

Restricted equals rule

=<regex> <file types> <attribute expression>

MACRO LINES

@@define VAR val

Define variable VAR to value val.

@@undef VAR

Undefine variable VAR.

@@if boolean_expression (added in AIDE v0.18)

@@else @@endif @@if begins an if statement. It must be terminated with an @@endif statement. The lines between @@if and @@endif are used if the boolean_expression evaluates to true. If there is an @@else statement then the part between @@if and @@else is used if boolean_expression evaluates to true otherwise the part between @@else and @@endif is used.

not boolean_expression

defined VARIABLE

hostname HOSTNAME

exists PATH

@@ifdef VARIABLE (DEPRECATED since AIDE v0.18, will be removed in AIDE v0.20)

same as @@if defined VARIABLE

@@ifndef VARIABLE (DEPRECATED since AIDE v0.18, will be removed in AIDE v0.20)

same as @@if not defined VARIABLE

@@ifhost HOSTNAME (DEPRECATED since AIDE v0.18, will be removed in AIDE v0.20)

same as @@if hostname HOSTNAME

@@ifnhost HOSTNAME (DEPRECATED since AIDE v0.18, will be removed in AIDE v0.20)

same as @@if not hostname HOSTNAME

@@{VAR}

@@{VAR} is replaced with the value of the variable VAR. If variable VAR is not defined an empty string is used. Variables are supported in strings and in regular expressions of selection lines.

@@include FILE

Include FILE. The content of the file is used as if it were inserted in this part of the config file. The maximum depth of nested includes is 16.

@@include DIRECTORY REGEX [RULE_PREFIX] (added in AIDE v0.17)

Include all (regular) files found in DIRECTORY matching regular expression REGEX (sub-directories are ignored). The file are included in lexical sort order. If RULE_PREFIX is set, all rules included by the statement are prefixed with given RULE_PREFIX (added in AIDE v0.18). Prefixes from nested include statements are concatenated. The content of the files is used as if it were inserted in this part of the config file.

@@x_include FILE (added in AIDE v0.17)

@@x_include DIRECTORY REGEX [RULE_PREFIX] (added in AIDE v0.17) @x_include is identical to @@include, except that if a config file is executable is is run and the output is used as config. If the executable file exits with status greater than zero or writes to stderr aide stops with an error. For security reasons DIRECTORY and each executable config file must be owned by the current user or root. They must not be group- or world-writable.

@@x_include_setenv VAR VALUE (added in AIDE v0.17)

Adds the variable VAR with the value VALUE to the environment used for config file execution. Environment variable names are limited to alphanumeric characters ( A-Za-z0-9) and the underscore ' _' and must not begin with a digit.

TYPES

ATTRIBUTES

ftype

file type (added in AIDE v0.15)

p

permissions

i

inode

l

link name

n

number of links

u

user

g

group

s

size

b

block count

m

mtime

a

atime

c

ctime

acl

access control list (requires libacl)

selinux

selinux attributes (requires libselinux)

xattrs

extended attributes (requires libattr)

e2fsattrs

file attributes on a second extended file system, see also report_ignore_e2fsattrs option (requires libext2fs, added in AIDE v0.15)

caps

file capabilities (requires libcap2, added in AIDE v0.17)

S

check for growing size (DEPRECATED since AIDE v0.18, will be removed in AIDE v0.20) Use growing+s attributes instead

I

ignore changed filename When I is used, the inode of the old file is used to search for a moved file in the new database. Source and target file have to be located in the same directory and must share the same attributes (except for special attributes ANF, ARF, I, growing, and compressed). For moved entries a change of the ctime attribute is ignored.

growing

ignore growing file (added in AIDE v0.18) When growing is used, changes of the following attributes are ignored: size: if new size is greater than old size bcount: if new bcount is greater than old bcount atime: if new atime is greater than old atime mtime: if new mtime is greater than old mtime ctime: if new ctime is greater than old ctime hashsums: if the hashsum of the new file restricted to the old size equals the hashsums of the old file For hashsum attributes the growing attribute is ignored in compare mode.

compressed

ignore compressed file (added in AIDE v0.18) When compressed is used, the uncompressed hashsums of the new compressed file (supported compressions: gzip) are used to search for the uncompressed file in the old database. The old uncompressed and the new compressed file have to be located in the same directory and must share the same attributes (except for special attributes ANF, ARF, I, growing, and compressed) including at least one hashsum. Changes of the inode, size, bcount and ctime attributes are ignored. The growing attribute (i.e. the old file size) is not considered for compressed files during the calculation of the uncompressed hashsums. The compressed attribute is ignored in compare mode.

ANF

allow new files When 'ANF' is used, new files are added to the new database, but are ignored in the report.

ARF

allow removed files When 'ARF' is used, files missing on disk are omitted from the new database, but are ignored in the report.

md5

MD5 checksum (not in libgcrypt FIPS mode)

sha1

SHA-1 checksum

sha256

SHA-256 checksum

sha512

SHA-512 checksum

rmd160

RIPEMD-160 checksum

tiger

tiger checksum

haval

haval256 checksum ( libmhash only)

crc32

crc32 checksum

crc32b

crc32 checksum ( libmhash only)

gost

GOST R 34.11-94 checksum

whirlpool

whirlpool checksum

stribog256

GOST R 34.11-2012, 256 bit checksum ( libgcrypt only, added in AIDE v0.17)

stribog512

GOST R 34.11-2012, 512 bit checksum ( libgcrypt only, added in AIDE v0.17)

EXAMPLES

/ R

This adds all files on your machine to the database. This one line is a fully qualified configuration file.

!/dev$

This ignores the /dev directory structure.

=/foo R

Only /foo and /foobar are taken into the database. None of their children are added.

=/foo/ R

Only /foo and its children (e.g. /foo/file and /foo/directory) are taken into the database. The children of sub-directories (e.g. /foo/directory/bar) are not added.

/ d,f R

Only add directories and files to the database

!/run d

/run R Add all but directory entries to the database

/run d R-m-c-i

/run R Use specific rule for directories

Suggested Groups

OwnerMode = p+u+g+ftype

Check permissions, owner, group and file type

Size = s+b

Check size and block count

InodeData = OwnerMode+n+i+Size+l+X

StaticFile = m+c+Checksums Files that stay static

VarTime = InodeData+Checksums

/etc/ssl/certs/ca-certificates\\.crt$ VarTime Files that change their mtimes or ctimes but not their contents.

VarInode = VarTime-i

/var/lib/nfs/etab$ f VarInode Files that are recreated regularly but do not change their contents

VarFile = OwnerMode+n+l+X

/etc/resolv\\.conf$ f VarFile Files that change their contents during system operation

VarDir = OwnerMode+n+i+X

/var/lib/snmp$ d VarDir Directories that change their contents during system operation

RecreatedDir = OwnerMode+n+X

/run/samba$ d RecreatedDir Directories that are recreated regularly and change their contents

Log Handling

ActLog=Full+growing+ANF+I

/var/log/foo\\.log$ f ActLog An Active Log is typically named foo.log. It is constanty being written to. The file does neither change its mode nor its inode number. The size only increases, and what is written to the file is not supposed to change (growing). During log rotation, foo.log is typically renamed to foo.log.1 (or foo.log.0) and the process is instructed to write to a new foo.log. Log content is written to a new file (ANF) and will eventually be renamed to foo.log.1 (I). The growing attribute suppresses reports for files that just had content appended when compared to the database. A change of the old content is still reported!

RotLog=Full

/var/log/foo\\.log\\.1$ f RogLog foo.log.0 or foo.log.1 is called the Rotated Log, the previously active log renamed to the first name of the Log Series that is formed by the rotation mechanism. Right after rotation, the file might still being written to by the daemon. To aide, this looks like the Active Log's size decreases and its inode and timestamps change. The Rotated Log is not supposed to change its attributes once the process has stopped writing to it. Reports might be generated if aide runs while the process still writes to the Rotated Log, but this is quite unlikely to happen. Some log rotation mechanisms rename foo.log to foo.log.0 to foo.log.1.gz, others rename foo.log to foo.log.1 to foo.2.log.gz.

CompSerLog=Full+I+compressed

/var/log/foo\\.log\\.2\\.gz$ f CompSerLog In the next rotation step, foo.log.1 gets compressed to foo.log.2.gz, becoming the Compressed Log in the Log Series. With this rule, AIDE does not report this step because it uncompresses the contents of the file and takes the checksum of the uncompressed content. The contents strictly doesn't change, but some attribute changes are ignored (compressed).

MidlSerLog=Full+I

/var/log/foo\\.log\\.[345]\\.gz$ f MidlSerLog In the next log rotation, all foo.log.{x} get renamed to foo.log.{x+1}. The other attributes are not supposed to change.

LastSerLog=Full+ARF

/var/log/foo\\.log\\.6\\.gz$ f LastSerLog The configuration of the log rotation process specifies a number of log generations to keep. The last log in the series is therefore removed from the disk (ARF).

empty files

It might be the case that a log is actually created, but never written to. This commonly happens on rarely used web servers that use the log rotation as a method to cater for data protection regulation. In result, all files in a series are identical, breaking the heuristics that aide uses to detect log rotation. A possible workaround is to begin a newly rotated log with a timestamp. With logrotate, this can be done in a postrotate scriptlet.

nodelaycompress

With logrotate's nodelaycompress option, a log is immediately compressed after renaming it from the Active Log name. For the time being, it is recommended to always use the delaycompress option to avoid this behavior.

copytruncate

With logrotate's copytruncate option, the Active Log is not renamed and newly created but copied to the new file name. After the copy operation, the old file is truncated to zero size, allowing the daemon to continuously write to the already open file handle. aide uses the Inode number to detect the rotation process. That doesn't work with copytruncate because the Inode stays with the Active Log. For the time being, it is recommended to avoid the copytruncate option to avoid this behavior.

HINTS

/foo epug

/foo e+p+u+g

SEE ALSO

DISCLAIMER