aide.conf(5) - The configuration file for Advanced Intrusion Detection Environment
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AIDE.CONF(5) AIDE AIDE.CONF(5) NAME aide.conf - The configuration file for Advanced Intrusion Detection Environment SYNOPSIS aide.conf is the configuration file for Advanced Intrusion Detection Environment. aide.conf contains the runtime configuration aide uses to initialize or check the AIDE database. FILE FORMAT aide.conf is similar in to Tripwire(tm)'s configuration file. With lit‐ tle effort tw.conf can be converted to aide.conf. aide.conf is case-sensitive. Leading and trailing white spaces are ignored. There are three types of lines in aide.conf. First there are the con‐ figuration lines which are used to set configuration parameters and define/undefine variables. Second, there are (restricted) selection lines that are used to indicate which files are added to the database. Third, macro lines define or undefine variables within the config file. Lines beginning with # are ignored as comments. CONFIG LINES These lines have the format parameter=value. See URLS for a list of valid urls. database 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. The default value is "/usr/etc/aide.db". database_out 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. The default value is "/usr/etc/aide.db.new". database_new The url from which the other database for --compare is read. There is no default for this one. database_attrs The attributes of the (uncompressed) database files which are to be added to the final report in verbose level 2 or higher. Only checksum attributes are supported. To disable set database_attrs to 'E'. By default all compiled in checksums are added to the report. database_add_metadata Whether to add the AIDE version and the time of database genera‐ tion as comments to the database file or not. Valid values are yes, true, no and false. The default is to add the AIDE version and the time of database generation. This option may be set to no by default in a future release. verbose The level of messages that is output. This value can be 0-255 inclusive. This parameter can only be given once. Value from the first occurrence is used. If --verbose or -V is used then the value from that is used. The default is 5. If verbosity is 20 then additional report output is written when doing --check, --update or --compare. syslog_format Valid values are yes,true,no and false. This option enables new syslog format which is suitable for logging. Every change is logged as one simple line. This option changes verbose level to 0 and prints everything that was changed. It is suggested to use this option with "report_url=syslog:...". Default value is "false/no". Maximum size of message is 1KB which is limitation of syslog call. If message is greater than limit, message will be truncated. Option summarize_changes has no impact for this format. Output always starts with: "AIDE found differences between database and filesystem!!" And it is followed by summary: summary;total_number_of_files=1000;added_files=0;removed_files=0;changed_files=1 And finally there are logs about changes: dir=/usr/sbin;Mtime_old=0000-00-00 00:00:00;Mtime_new=0000-00-00 00:00:00;... report_url The url that the output is written to. There can be multiple instances of this parameter. Output is written to all of them. The default is stdout. report_base16 Whether to base16 encode the checksums in the report or not. Valid values are yes, true, no and false. The default is to report checksums not in base16 but in base64 encoding. report_detailed_init Whether to report added files (verbose level >= 2) and their details (verbose level >=7) in initialization mode or not. Valid values are yes, true, no and false. The default is to not report added files or their details in init mode. report_quiet Whether to suppress report output if no differences to the data‐ base have been found or not. Valid values are yes, true, no and false. The default is to not suppress output in the report. gzip_dbout Whether the output to the database is gzipped or not. Valid val‐ ues are yes,true,no and false. The default is no. This option is available only if zlib support is compiled in. root_prefix 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. The default is no (an empty) prefix. This option has no effect in compare mode. acl_no_symlink_follow Whether to check ACLs for symlinks or not. Valid values are yes,true,no and false. The default is to follow symlinks. This option is available only if acl support is compiled in. warn_dead_symlinks Whether to warn about dead symlinks or not. Valid values are yes,true,no and false. The default is not to warn about dead symlinks. grouped Whether to group the files in the report by added, removed and changed files or not. Valid values are yes, true, no and false. The default is to group the files in the report. summarize_changes Whether to summarize changes in the added, removed and changed files sections of the report or not. Valid values are yes,true,no and false. The default is to summarize the changes. The general format is like the string YlZbpugamcinCAXSE, 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, a "+" 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: o A l means that the link name has changed. o A b means that the block count has changed. o A p means that the permissions have changed. o An u means that the uid has changed. o A g means that the gid has changed. o An a means that the access time has changed. o A m means that the modification time has changed. o A c means that the change time has changed. o An i means that the inode has changed. o A n means that the link count has changed. o A C means that one or more checksums have changed. The following letters are only available when explicitly enabled using configure: o A A means that the access control list has changed. o A X means that the extended attributes have changed. o A S means that the SELinux attributes have changed. o A E means that the file attributes on a second extended file system have changed. report_ignore_added_attrs Special group definition that lists attributes whose addition is to be ignored in the final report. report_ignore_removed_attrs Special group definition that lists attributes whose removal is to be ignored in the final report. report_ignore_changed_attrs ignore_list (DEPRECATED, will be removed in a future release) Special group definition that lists attributes whose change is to be ignored in the final report. report_force_attrs report_attributes (DEPRECATED, will be removed in a future release) Special group definition that lists attributes which are always printed in the final 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 if the file has been otherwise changed. report_ignore_e2fsattrs List (no delimiter) of ext2 file attributes which are to be ignored in the final report. See chattr(1) for the available attributes. Use '0' to not ignore any attribute. Ignored attributes are represented by a ':' in the output. The default is to not ignore any ext2 file attribute. Example Ignore changes of the ext2 file attributes compression error (E), huge file (h), indexed directory (I): report_ignore_e2fsattrs=EhI config_version 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. Group definitions If the parameter is not one of the previous parameters then it is regarded as a group definition. Value is then regarded as an expression. Expression is of the following form. <predefined group>| <expr> + <predefined group> | <expr> - <predefined group> See DEFAULT GROUPS for an explanation of default predefined groups. Note that this is different from the way Tripwire(tm) does it. SELECTION LINES AIDE supports three types of selection lines: Regular selection line: <regex> <group> Files and directories matching the regular expression are added to the database. Negative selection line: !<regex> Files and directories matching the regular expression are ignored and not added to the database. Equals selection line: =<regex> <group> Files and directories matching the regular expression are added to the database. The children of directories are only added if the reg‐ ular expression ends with a "/". The children of sub-directories are not added at all. Every regular expression has to start with a "/". An implicit ^ is added in front of each regular expression. In other words the regular expressions are matched at the first position against the complete filename (i.e. including the path). Special characters in your file‐ names can be escaped using two-digit URL encoding (for example, %20 to represent a space). See EXAMPLES and doc/aide.conf for examples. More in-depth discussion of the selection algorithm can be found in the AIDE manual. RESTRICTED SELECTION LINES Restricted selection lines are like normal selection lines but can be restricted to file types. The following file types are supported: 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 The file types are separated by comma. The syntax of restricted selec‐ tion lines is as follows: Restricted regular selection line: <regex> <file types> <group> Restricted negative selection line: !<regex> <file types> Restricted equals selection line: =<regex> <file types> <group> Examples Only add directories and files to the database: / d,f R Add all but directory entries to the database: !/run d /run R Use specific rule for directories: /run d R-m-c-i /run R MACRO LINES @@define VAR val Define variable VAR to value val. @@undef VAR Undefine variable VAR. @@ifdef VAR, @@ifndef VAR @@ifdef begins an if statement. It must be terminated with an @@endif statement. The lines between @@ifdef and @@endif are used if variable VAR is defined. If there is an @@else statement then the part between @@ifdef and @@else is used is VAR is defined otherwise the part between @@else and @@endif is used. @@ifndef reverses the logic of @@ifdef statement but otherwise works similarly. @@ifhost hostname, @@ifnhost hostname @@ifhost works like @@ifdef only difference is that it checks whether hostname equals the name of the host that AIDE is run‐ ning on. hostname is the name of the host without the domain‐ name (hostname, not hostname.example.com). @@{VAR} @@{VAR} is replaced with the value of the variable VAR. If variable VAR is not defined an empty string is used. Unlike Tripwire(tm) @@VAR is NOT supported. One special VAR is @@{HOST‐ NAME} which is substituted for the hostname of the current sys‐ tem. @@else Begins the else part of an if statement. @@endif Ends an if statement. @@include VAR Includes the file VAR. The content of the file is used as if it were inserted in this part of the config file. URLS Urls can be one of the following. Input urls cannot be used as outputs and vice versa. stdout stderr Output is sent to stdout,stderr respectively. stdin Input is read from stdin. file://filename Input is read from filename or output is written to filename. fd:number Input is read from filedescriptor number or output is written to number. DEFAULT GROUPS p: permissions ftype: file type i: inode l: link name n: number of links u: user g: group s: size b: block count m: mtime a: atime c: ctime S: check for growing size I: ignore changed filename ANF: allow new files ARF: allow removed files md5: md5 checksum sha1: sha1 checksum sha256: sha256 checksum sha512: sha512 checksum rmd160: rmd160 checksum tiger: tiger checksum haval: haval checksum crc32: crc32 checksum R: p+ftype+i+l+n+u+g+s+m+c+md5+X L: p+ftype+i+l+n+u+g+X E: Empty group X: acl+selinux+xattrs+e2fsattrs (if groups are explicitly enabled) >: Growing file p+ftype+l+u+g+i+n+S+X And also the following if you have mhash support enabled gost: gost checksum whirlpool: whirlpool checksum The following are available only when explicitly enabled using config‐ ure acl: access control list selinux: selinux attributes xattrs: extended attributes e2fsattrs: file attributes on a second extended file system Please note that 'I' and 'c' are incompatible. When the name of a file is changed, it's ctime is updated as well. When you put 'c' and 'I' in the same rule the, a changed ctime is silently ignored. When 'ANF' is used, new files are added to the new database, but are ignored in the report. When 'ARF' is used, files missing on disk are omitted from the new database, but are ignored in the report. 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 chil‐ dren 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. All=p+i+n+u+g+s+m+c+a+md5+sha1+tiger+rmd160 This line defines group All. It has all attributes and all md checksum functions. If you absolutely want all digest functions then you should enable mhash support and add +crc32+haval+gost to the end of the defi‐ nition for All. Mhash support can only be enabled at compile-time. HINTS In the following, the first is not allowed in AIDE. Use the latter instead. /foo epug /foo e+p+u+g SEE ALSO aide(1) manual.html DISCLAIMER All trademarks are the property of their respective owners. No animals were harmed while making this webpage or this piece of software. aide 0.16 Jul 25, 2016 AIDE.CONF(5)
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