From 9ada0093e92388590c7368600ca4e9e3e376f0d0 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 16:22:51 +0200 Subject: Adding upstream version 1.5.2. Signed-off-by: Daniel Baumann --- modules/pam_limits/Makefile.am | 40 ++ modules/pam_limits/Makefile.in | 1227 ++++++++++++++++++++++++++++++++++ modules/pam_limits/README | 70 ++ modules/pam_limits/README.xml | 39 ++ modules/pam_limits/limits.conf | 61 ++ modules/pam_limits/limits.conf.5 | 349 ++++++++++ modules/pam_limits/limits.conf.5.xml | 360 ++++++++++ modules/pam_limits/pam_limits.8 | 152 +++++ modules/pam_limits/pam_limits.8.xml | 257 +++++++ modules/pam_limits/pam_limits.c | 1215 +++++++++++++++++++++++++++++++++ modules/pam_limits/tst-pam_limits | 2 + 11 files changed, 3772 insertions(+) create mode 100644 modules/pam_limits/Makefile.am create mode 100644 modules/pam_limits/Makefile.in create mode 100644 modules/pam_limits/README create mode 100644 modules/pam_limits/README.xml create mode 100644 modules/pam_limits/limits.conf create mode 100644 modules/pam_limits/limits.conf.5 create mode 100644 modules/pam_limits/limits.conf.5.xml create mode 100644 modules/pam_limits/pam_limits.8 create mode 100644 modules/pam_limits/pam_limits.8.xml create mode 100644 modules/pam_limits/pam_limits.c create mode 100755 modules/pam_limits/tst-pam_limits (limited to 'modules/pam_limits') diff --git a/modules/pam_limits/Makefile.am b/modules/pam_limits/Makefile.am new file mode 100644 index 0000000..911b07b --- /dev/null +++ b/modules/pam_limits/Makefile.am @@ -0,0 +1,40 @@ +# +# Copyright (c) 2005, 2006, 2009 Thorsten Kukuk +# + +CLEANFILES = *~ +MAINTAINERCLEANFILES = $(MANS) README + +EXTRA_DIST = $(XMLS) + +if HAVE_DOC +dist_man_MANS = limits.conf.5 pam_limits.8 +endif +XMLS = README.xml limits.conf.5.xml pam_limits.8.xml +dist_check_SCRIPTS = tst-pam_limits +TESTS = $(dist_check_SCRIPTS) + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) +limits_conf_dir = $(SCONFIGDIR)/limits.d + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -DLIMITS_FILE_DIR=\"$(limits_conf_dir)/*.conf\" \ + -DLIMITS_FILE=\"$(SCONFIGDIR)/limits.conf\" $(WARN_CFLAGS) +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_limits.la +pam_limits_la_LIBADD = $(top_builddir)/libpam/libpam.la + +dist_secureconf_DATA = limits.conf + +install-data-local: + mkdir -p $(DESTDIR)$(limits_conf_dir) + +if ENABLE_REGENERATE_MAN +dist_noinst_DATA = README +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_limits/Makefile.in b/modules/pam_limits/Makefile.in new file mode 100644 index 0000000..ac26508 --- /dev/null +++ b/modules/pam_limits/Makefile.in @@ -0,0 +1,1227 @@ +# Makefile.in generated by automake 1.16.3 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2020 Free Software Foundation, Inc. + +# This Makefile.in is free software; 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Users of uid=0 are affected by this limits, too. + +By default limits are taken from the /etc/security/limits.conf config file. +Then individual *.conf files from the /etc/security/limits.d/ directory are +read. The files are parsed one after another in the order of "C" locale. The +effect of the individual files is the same as if all the files were +concatenated together in the order of parsing. If a config file is explicitly +specified with a module option then the files in the above directory are not +parsed. + +The module must not be called by a multithreaded application. + +If Linux PAM is compiled with audit support the module will report when it +denies access based on limit of maximum number of concurrent login sessions. + +OPTIONS + +conf=/path/to/limits.conf + + Indicate an alternative limits.conf style configuration file to override + the default. + +debug + + Print debug information. + +set_all + + Set the limits for which no value is specified in the configuration file to + the one from the process with the PID 1. Please note that if the init + process is systemd these limits will not be the kernel default limits and + this option should not be used. + +utmp_early + + Some broken applications actually allocate a utmp entry for the user before + the user is admitted to the system. If some of the services you are + configuring PAM for do this, you can selectively use this module argument + to compensate for this behavior and at the same time maintain system-wide + consistency with a single limits.conf file. + +noaudit + + Do not report exceeded maximum logins count to the audit subsystem. + +EXAMPLES + +These are some example lines which might be specified in /etc/security/ +limits.conf. + +* soft core 0 +* hard nofile 512 +@student hard nproc 20 +@faculty soft nproc 20 +@faculty hard nproc 50 +ftp hard nproc 0 +@student - maxlogins 4 +@student - nonewprivs 1 +:123 hard cpu 5000 +@500: soft cpu 10000 +600:700 hard locks 10 + + diff --git a/modules/pam_limits/README.xml b/modules/pam_limits/README.xml new file mode 100644 index 0000000..964a5a2 --- /dev/null +++ b/modules/pam_limits/README.xml @@ -0,0 +1,39 @@ + + +--> + +]> + +
+ + + + + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_limits.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_limits-name"]/*)'/> + + + + +
+ +
+ +
+ +
+ +
+ +
+ +
diff --git a/modules/pam_limits/limits.conf b/modules/pam_limits/limits.conf new file mode 100644 index 0000000..e8a746c --- /dev/null +++ b/modules/pam_limits/limits.conf @@ -0,0 +1,61 @@ +# /etc/security/limits.conf +# +#This file sets the resource limits for the users logged in via PAM. +#It does not affect resource limits of the system services. +# +#Also note that configuration files in /etc/security/limits.d directory, +#which are read in alphabetical order, override the settings in this +#file in case the domain is the same or more specific. +#That means, for example, that setting a limit for wildcard domain here +#can be overridden with a wildcard setting in a config file in the +#subdirectory, but a user specific setting here can be overridden only +#with a user specific setting in the subdirectory. +# +#Each line describes a limit for a user in the form: +# +# +# +#Where: +# can be: +# - a user name +# - a group name, with @group syntax +# - the wildcard *, for default entry +# - the wildcard %, can be also used with %group syntax, +# for maxlogin limit +# +# can have the two values: +# - "soft" for enforcing the soft limits +# - "hard" for enforcing hard limits +# +# can be one of the following: +# - core - limits the core file size (KB) +# - data - max data size (KB) +# - fsize - maximum filesize (KB) +# - memlock - max locked-in-memory address space (KB) +# - nofile - max number of open file descriptors +# - rss - max resident set size (KB) +# - stack - max stack size (KB) +# - cpu - max CPU time (MIN) +# - nproc - max number of processes +# - as - address space limit (KB) +# - maxlogins - max number of logins for this user +# - maxsyslogins - max number of logins on the system +# - priority - the priority to run user process with +# - locks - max number of file locks the user can hold +# - sigpending - max number of pending signals +# - msgqueue - max memory used by POSIX message queues (bytes) +# - nice - max nice priority allowed to raise to values: [-20, 19] +# - rtprio - max realtime priority +# +# +# + +#* soft core 0 +#* hard rss 10000 +#@student hard nproc 20 +#@faculty soft nproc 20 +#@faculty hard nproc 50 +#ftp hard nproc 0 +#@student - maxlogins 4 + +# End of file diff --git a/modules/pam_limits/limits.conf.5 b/modules/pam_limits/limits.conf.5 new file mode 100644 index 0000000..a4a0ed3 --- /dev/null +++ b/modules/pam_limits/limits.conf.5 @@ -0,0 +1,349 @@ +'\" t +.\" Title: limits.conf +.\" Author: [see the "AUTHOR" section] +.\" Generator: DocBook XSL Stylesheets v1.79.1 +.\" Date: 09/03/2021 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "LIMITS\&.CONF" "5" "09/03/2021" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +limits.conf \- configuration file for the pam_limits module +.SH "DESCRIPTION" +.PP +The +\fIpam_limits\&.so\fR +module applies ulimit limits, nice priority and number of simultaneous login sessions limit to user login sessions\&. This description of the configuration file syntax applies to the +/etc/security/limits\&.conf +file and +*\&.conf +files in the +/etc/security/limits\&.d +directory\&. +.PP +The syntax of the lines is as follows: +.PP +\fI\fR +\fI\fR +\fI\fR +\fI\fR +.PP +The fields listed above should be filled as follows: +.PP +\fB\fR +.RS 4 +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +a username +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +a groupname, with +\fB@group\fR +syntax\&. This should not be confused with netgroups\&. +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +the wildcard +\fB*\fR, for default entry\&. +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +the wildcard +\fB%\fR, for maxlogins limit only, can also be used with +\fB%group\fR +syntax\&. If the +\fB%\fR +wildcard is used alone it is identical to using +\fB*\fR +with maxsyslogins limit\&. With a group specified after +\fB%\fR +it limits the total number of logins of all users that are member of the group\&. +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +an uid range specified as +\fI\fR\fB:\fR\fI\fR\&. If min_uid is omitted, the match is exact for the max_uid\&. If max_uid is omitted, all uids greater than or equal min_uid match\&. +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +a gid range specified as +\fB@\fR\fI\fR\fB:\fR\fI\fR\&. If min_gid is omitted, the match is exact for the max_gid\&. If max_gid is omitted, all gids greater than or equal min_gid match\&. For the exact match all groups including the user\*(Aqs supplementary groups are examined\&. For the range matches only the user\*(Aqs primary group is examined\&. +.RE +.sp +.RS 4 +.ie n \{\ +\h'-04'\(bu\h'+03'\c +.\} +.el \{\ +.sp -1 +.IP \(bu 2.3 +.\} +a gid specified as +\fB%:\fR\fI\fR +applicable to maxlogins limit only\&. It limits the total number of logins of all users that are member of the group with the specified gid\&. +.RE +.RE +.PP +\fB\fR +.RS 4 +.PP +\fBhard\fR +.RS 4 +for enforcing +\fBhard\fR +resource limits\&. These limits are set by the superuser and enforced by the Kernel\&. The user cannot raise his requirement of system resources above such values\&. +.RE +.PP +\fBsoft\fR +.RS 4 +for enforcing +\fBsoft\fR +resource limits\&. These limits are ones that the user can move up or down within the permitted range by any pre\-existing +\fBhard\fR +limits\&. The values specified with this token can be thought of as +\fIdefault\fR +values, for normal system usage\&. +.RE +.PP +\fB\-\fR +.RS 4 +for enforcing both +\fBsoft\fR +and +\fBhard\fR +resource limits together\&. +.sp +Note, if you specify a type of \*(Aq\-\*(Aq but neglect to supply the item and value fields then the module will never enforce any limits on the specified user/group etc\&. \&. +.RE +.RE +.PP +\fB\fR +.RS 4 +.PP +\fBcore\fR +.RS 4 +limits the core file size (KB) +.RE +.PP +\fBdata\fR +.RS 4 +maximum data size (KB) +.RE +.PP +\fBfsize\fR +.RS 4 +maximum filesize (KB) +.RE +.PP +\fBmemlock\fR +.RS 4 +maximum locked\-in\-memory address space (KB) +.RE +.PP +\fBnofile\fR +.RS 4 +maximum number of open file descriptors +.RE +.PP +\fBrss\fR +.RS 4 +maximum resident set size (KB) (Ignored in Linux 2\&.4\&.30 and higher) +.RE +.PP +\fBstack\fR +.RS 4 +maximum stack size (KB) +.RE +.PP +\fBcpu\fR +.RS 4 +maximum CPU time (minutes) +.RE +.PP +\fBnproc\fR +.RS 4 +maximum number of processes +.RE +.PP +\fBas\fR +.RS 4 +address space limit (KB) +.RE +.PP +\fBmaxlogins\fR +.RS 4 +maximum number of logins for this user (this limit does not apply to user with +\fIuid=0\fR) +.RE +.PP +\fBmaxsyslogins\fR +.RS 4 +maximum number of all logins on system; user is not allowed to log\-in if total number of all user logins is greater than specified number (this limit does not apply to user with +\fIuid=0\fR) +.RE +.PP +\fBnonewprivs\fR +.RS 4 +value of 0 or 1; if set to 1 disables acquiring new privileges by invoking prctl(PR_SET_NO_NEW_PRIVS) +.RE +.PP +\fBpriority\fR +.RS 4 +the priority to run user process with (negative values boost process priority) +.RE +.PP +\fBlocks\fR +.RS 4 +maximum locked files (Linux 2\&.4 and higher) +.RE +.PP +\fBsigpending\fR +.RS 4 +maximum number of pending signals (Linux 2\&.6 and higher) +.RE +.PP +\fBmsgqueue\fR +.RS 4 +maximum memory used by POSIX message queues (bytes) (Linux 2\&.6 and higher) +.RE +.PP +\fBnice\fR +.RS 4 +maximum nice priority allowed to raise to (Linux 2\&.6\&.12 and higher) values: [\-20,19] +.RE +.PP +\fBrtprio\fR +.RS 4 +maximum realtime priority allowed for non\-privileged processes (Linux 2\&.6\&.12 and higher) +.RE +.RE +.PP +All items support the values +\fI\-1\fR, +\fIunlimited\fR +or +\fIinfinity\fR +indicating no limit, except for +\fBpriority\fR, +\fBnice\fR, and +\fBnonewprivs\fR\&. If +\fBnofile\fR +is to be set to one of these values, it will be set to the contents of /proc/sys/fs/nr_open instead (see setrlimit(3))\&. +.PP +If a hard limit or soft limit of a resource is set to a valid value, but outside of the supported range of the local system, the system may reject the new limit or unexpected behavior may occur\&. If the control value +\fIrequired\fR +is used, the module will reject the login if a limit could not be set\&. +.PP +In general, individual limits have priority over group limits, so if you impose no limits for +\fIadmin\fR +group, but one of the members in this group have a limits line, the user will have its limits set according to this line\&. +.PP +Also, please note that all limit settings are set +\fIper login\fR\&. They are not global, nor are they permanent; existing only for the duration of the session\&. One exception is the +\fImaxlogin\fR +option, this one is system wide\&. But there is a race, concurrent logins at the same time will not always be detect as such but only counted as one\&. +.PP +In the +\fIlimits\fR +configuration file, the \*(Aq\fB#\fR\*(Aq character introduces a comment \- after which the rest of the line is ignored\&. +.PP +The pam_limits module does report configuration problems found in its configuration file and errors via +\fBsyslog\fR(3)\&. +.SH "EXAMPLES" +.PP +These are some example lines which might be specified in +/etc/security/limits\&.conf\&. +.sp +.if n \{\ +.RS 4 +.\} +.nf +* soft core 0 +* hard nofile 512 +@student hard nproc 20 +@faculty soft nproc 20 +@faculty hard nproc 50 +ftp hard nproc 0 +@student \- maxlogins 4 +@student \- nonewprivs 1 +:123 hard cpu 5000 +@500: soft cpu 10000 +600:700 hard locks 10 + +.fi +.if n \{\ +.RE +.\} +.SH "SEE ALSO" +.PP +\fBpam_limits\fR(8), +\fBpam.d\fR(5), +\fBpam\fR(8), +\fBgetrlimit\fR(2), +\fBgetrlimit\fR(3p) +.SH "AUTHOR" +.PP +pam_limits was initially written by Cristian Gafton diff --git a/modules/pam_limits/limits.conf.5.xml b/modules/pam_limits/limits.conf.5.xml new file mode 100644 index 0000000..c5bd676 --- /dev/null +++ b/modules/pam_limits/limits.conf.5.xml @@ -0,0 +1,360 @@ + + + + + + + limits.conf + 5 + Linux-PAM Manual + + + + limits.conf + configuration file for the pam_limits module + + + + DESCRIPTION + + The pam_limits.so module applies ulimit limits, + nice priority and number of simultaneous login sessions limit to user + login sessions. This description of the configuration file syntax + applies to the /etc/security/limits.conf file and + *.conf files in the + /etc/security/limits.d directory. + + + The syntax of the lines is as follows: + + + <domain> <type> + <item> <value> + + + The fields listed above should be filled as follows: + + + + + + + + + + + a username + + + + + a groupname, with @group syntax. + This should not be confused with netgroups. + + + + + the wildcard *, for default entry. + + + + + the wildcard %, for maxlogins limit only, + can also be used with %group syntax. If the + % wildcard is used alone it is identical + to using * with maxsyslogins limit. With + a group specified after % it limits the total + number of logins of all users that are member of the group. + + + + + an uid range specified as <min_uid>:<max_uid>. If min_uid + is omitted, the match is exact for the max_uid. If max_uid is omitted, all + uids greater than or equal min_uid match. + + + + + a gid range specified as @<min_gid>:<max_gid>. If min_gid + is omitted, the match is exact for the max_gid. If max_gid is omitted, all + gids greater than or equal min_gid match. For the exact match all groups including + the user's supplementary groups are examined. For the range matches only + the user's primary group is examined. + + + + + a gid specified as %:<gid> applicable + to maxlogins limit only. It limits the total number of logins of all users + that are member of the group with the specified gid. + + + + + + + + + + + + + + + + + for enforcing hard resource limits. + These limits are set by the superuser and enforced by the Kernel. + The user cannot raise his requirement of system resources above such values. + + + + + + + + for enforcing soft resource limits. + These limits are ones that the user can move up or down within the + permitted range by any pre-existing hard + limits. The values specified with this token can be thought of as + default values, for normal system usage. + + + + + + + + for enforcing both soft and + hard resource limits together. + + + Note, if you specify a type of '-' but neglect to supply the + item and value fields then the module will never enforce any + limits on the specified user/group etc. . + + + + + + + + + + + + + + + + + limits the core file size (KB) + + + + + + maximum data size (KB) + + + + + + maximum filesize (KB) + + + + + + maximum locked-in-memory address space (KB) + + + + + + maximum number of open file descriptors + + + + + + maximum resident set size (KB) (Ignored in Linux 2.4.30 and higher) + + + + + + maximum stack size (KB) + + + + + + maximum CPU time (minutes) + + + + + + maximum number of processes + + + + + + address space limit (KB) + + + + + + maximum number of logins for this user (this limit does + not apply to user with uid=0) + + + + + + maximum number of all logins on system; user is not + allowed to log-in if total number of all user logins is + greater than specified number (this limit does not apply to + user with uid=0) + + + + + + value of 0 or 1; if set to 1 disables acquiring new + privileges by invoking prctl(PR_SET_NO_NEW_PRIVS) + + + + + + the priority to run user process with (negative + values boost process priority) + + + + + + maximum locked files (Linux 2.4 and higher) + + + + + + maximum number of pending signals (Linux 2.6 and higher) + + + + + + maximum memory used by POSIX message queues (bytes) + (Linux 2.6 and higher) + + + + + + maximum nice priority allowed to raise to (Linux 2.6.12 and higher) values: [-20,19] + + + + + + maximum realtime priority allowed for non-privileged processes + (Linux 2.6.12 and higher) + + + + + + + + + All items support the values -1, + unlimited or infinity indicating no limit, + except for priority, nice, + and nonewprivs. + If nofile is to be set to one of these values, + it will be set to the contents of /proc/sys/fs/nr_open instead (see setrlimit(3)). + + + If a hard limit or soft limit of a resource is set to a valid value, + but outside of the supported range of the local system, the system + may reject the new limit or unexpected behavior may occur. If the + control value required is used, the module will + reject the login if a limit could not be set. + + + In general, individual limits have priority over group limits, so if + you impose no limits for admin group, but one of + the members in this group have a limits line, the user will have its + limits set according to this line. + + + Also, please note that all limit settings are set + per login. They are not global, nor are they + permanent; existing only for the duration of the session. + One exception is the maxlogin option, this one + is system wide. But there is a race, concurrent logins at the same + time will not always be detect as such but only counted as one. + + + In the limits configuration file, the + '#' character introduces a comment + - after which the rest of the line is ignored. + + + The pam_limits module does report configuration problems + found in its configuration file and errors via + syslog3. + + + + + EXAMPLES + + These are some example lines which might be specified in + /etc/security/limits.conf. + + +* soft core 0 +* hard nofile 512 +@student hard nproc 20 +@faculty soft nproc 20 +@faculty hard nproc 50 +ftp hard nproc 0 +@student - maxlogins 4 +@student - nonewprivs 1 +:123 hard cpu 5000 +@500: soft cpu 10000 +600:700 hard locks 10 + + + + + SEE ALSO + + pam_limits8, + pam.d5, + pam8, + getrlimit2, + getrlimit3p + + + + + AUTHOR + + pam_limits was initially written by Cristian Gafton <gafton@redhat.com> + + + diff --git a/modules/pam_limits/pam_limits.8 b/modules/pam_limits/pam_limits.8 new file mode 100644 index 0000000..50e9a10 --- /dev/null +++ b/modules/pam_limits/pam_limits.8 @@ -0,0 +1,152 @@ +'\" t +.\" Title: pam_limits +.\" Author: [see the "AUTHORS" section] +.\" Generator: DocBook XSL Stylesheets v1.79.1 +.\" Date: 09/03/2021 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "PAM_LIMITS" "8" "09/03/2021" "Linux-PAM Manual" "Linux-PAM Manual" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +pam_limits \- PAM module to limit resources +.SH "SYNOPSIS" +.HP \w'\fBpam_limits\&.so\fR\ 'u +\fBpam_limits\&.so\fR [conf=\fI/path/to/limits\&.conf\fR] [debug] [set_all] [utmp_early] [noaudit] +.SH "DESCRIPTION" +.PP +The pam_limits PAM module sets limits on the system resources that can be obtained in a user\-session\&. Users of +\fIuid=0\fR +are affected by this limits, too\&. +.PP +By default limits are taken from the +/etc/security/limits\&.conf +config file\&. Then individual *\&.conf files from the +/etc/security/limits\&.d/ +directory are read\&. The files are parsed one after another in the order of "C" locale\&. The effect of the individual files is the same as if all the files were concatenated together in the order of parsing\&. If a config file is explicitly specified with a module option then the files in the above directory are not parsed\&. +.PP +The module must not be called by a multithreaded application\&. +.PP +If Linux PAM is compiled with audit support the module will report when it denies access based on limit of maximum number of concurrent login sessions\&. +.SH "OPTIONS" +.PP +\fBconf=\fR\fB\fI/path/to/limits\&.conf\fR\fR +.RS 4 +Indicate an alternative limits\&.conf style configuration file to override the default\&. +.RE +.PP +\fBdebug\fR +.RS 4 +Print debug information\&. +.RE +.PP +\fBset_all\fR +.RS 4 +Set the limits for which no value is specified in the configuration file to the one from the process with the PID 1\&. Please note that if the init process is systemd these limits will not be the kernel default limits and this option should not be used\&. +.RE +.PP +\fButmp_early\fR +.RS 4 +Some broken applications actually allocate a utmp entry for the user before the user is admitted to the system\&. If some of the services you are configuring PAM for do this, you can selectively use this module argument to compensate for this behavior and at the same time maintain system\-wide consistency with a single limits\&.conf file\&. +.RE +.PP +\fBnoaudit\fR +.RS 4 +Do not report exceeded maximum logins count to the audit subsystem\&. +.RE +.SH "MODULE TYPES PROVIDED" +.PP +Only the +\fBsession\fR +module type is provided\&. +.SH "RETURN VALUES" +.PP +PAM_ABORT +.RS 4 +Cannot get current limits\&. +.RE +.PP +PAM_IGNORE +.RS 4 +No limits found for this user\&. +.RE +.PP +PAM_PERM_DENIED +.RS 4 +New limits could not be set\&. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Cannot read config file\&. +.RE +.PP +PAM_SESSION_ERR +.RS 4 +Error recovering account name\&. +.RE +.PP +PAM_SUCCESS +.RS 4 +Limits were changed\&. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +The user is not known to the system\&. +.RE +.SH "FILES" +.PP +/etc/security/limits\&.conf +.RS 4 +Default configuration file +.RE +.SH "EXAMPLES" +.PP +For the services you need resources limits (login for example) put a the following line in +/etc/pam\&.d/login +as the last line for that service (usually after the pam_unix session line): +.sp +.if n \{\ +.RS 4 +.\} +.nf +#%PAM\-1\&.0 +# +# Resource limits imposed on login sessions via pam_limits +# +session required pam_limits\&.so + +.fi +.if n \{\ +.RE +.\} +.PP +Replace "login" for each service you are using this module\&. +.SH "SEE ALSO" +.PP +\fBlimits.conf\fR(5), +\fBpam.d\fR(5), +\fBpam\fR(8)\&. +.SH "AUTHORS" +.PP +pam_limits was initially written by Cristian Gafton diff --git a/modules/pam_limits/pam_limits.8.xml b/modules/pam_limits/pam_limits.8.xml new file mode 100644 index 0000000..bc46cbf --- /dev/null +++ b/modules/pam_limits/pam_limits.8.xml @@ -0,0 +1,257 @@ + + + + + + + pam_limits + 8 + Linux-PAM Manual + + + + pam_limits + + PAM module to limit resources + + + + + + + + pam_limits.so + + conf=/path/to/limits.conf + + + debug + + + set_all + + + utmp_early + + + noaudit + + + + + + + DESCRIPTION + + The pam_limits PAM module sets limits on the system resources that can be + obtained in a user-session. Users of uid=0 are affected + by this limits, too. + + + By default limits are taken from the /etc/security/limits.conf + config file. Then individual *.conf files from the /etc/security/limits.d/ + directory are read. The files are parsed one after another in the order of "C" locale. + The effect of the individual files is the same as if all the files were + concatenated together in the order of parsing. + If a config file is explicitly specified with a module option then the + files in the above directory are not parsed. + + + The module must not be called by a multithreaded application. + + + If Linux PAM is compiled with audit support the module will report + when it denies access based on limit of maximum number of concurrent + login sessions. + + + + + OPTIONS + + + + + + + + Indicate an alternative limits.conf style configuration file to + override the default. + + + + + + + + + + Print debug information. + + + + + + + + + + Set the limits for which no value is specified in the + configuration file to the one from the process with the + PID 1. Please note that if the init process is systemd + these limits will not be the kernel default limits and + this option should not be used. + + + + + + + + + + Some broken applications actually allocate a utmp entry for + the user before the user is admitted to the system. If some + of the services you are configuring PAM for do this, you can + selectively use this module argument to compensate for this + behavior and at the same time maintain system-wide consistency + with a single limits.conf file. + + + + + + + + + + Do not report exceeded maximum logins count to the audit subsystem. + + + + + + + + MODULE TYPES PROVIDED + + Only the module type is provided. + + + + + RETURN VALUES + + + PAM_ABORT + + + Cannot get current limits. + + + + + PAM_IGNORE + + + No limits found for this user. + + + + + PAM_PERM_DENIED + + + New limits could not be set. + + + + + PAM_SERVICE_ERR + + + Cannot read config file. + + + + + PAM_SESSION_ERR + + + Error recovering account name. + + + + + PAM_SUCCESS + + + Limits were changed. + + + + + PAM_USER_UNKNOWN + + + The user is not known to the system. + + + + + + + + FILES + + + /etc/security/limits.conf + + Default configuration file + + + + + + + EXAMPLES + + For the services you need resources limits (login for example) put a + the following line in /etc/pam.d/login as the last + line for that service (usually after the pam_unix session line): + + +#%PAM-1.0 +# +# Resource limits imposed on login sessions via pam_limits +# +session required pam_limits.so + + + Replace "login" for each service you are using this module. + + + + + SEE ALSO + + + limits.conf5 + , + + pam.d5 + , + + pam8 + . + + + + + AUTHORS + + pam_limits was initially written by Cristian Gafton <gafton@redhat.com> + + + diff --git a/modules/pam_limits/pam_limits.c b/modules/pam_limits/pam_limits.c new file mode 100644 index 0000000..7cc45d7 --- /dev/null +++ b/modules/pam_limits/pam_limits.c @@ -0,0 +1,1215 @@ +/* + * pam_limits - impose resource limits when opening a user session + * + * 1.6 - modified for PLD (added process priority settings) + * by Marcin Korzonek + * 1.5 - Elliot Lee's "max system logins patch" + * 1.4 - addressed bug in configuration file parser + * 1.3 - modified the configuration file format + * 1.2 - added 'debug' and 'conf=' arguments + * 1.1 - added @group support + * 1.0 - initial release - Linux ONLY + * + * See end for Copyright information + */ + +#if !defined(linux) && !defined(__linux) +#warning THIS CODE IS KNOWN TO WORK ONLY ON LINUX !!! +#endif + +#include "config.h" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#ifndef UT_USER /* some systems have ut_name instead of ut_user */ +#define UT_USER ut_user +#endif + +#include +#include +#include + +#ifdef HAVE_LIBAUDIT +#include +#endif + +/* Module defines */ +#define LINE_LENGTH 1024 + +#define LIMITS_DEF_USER 0 /* limit was set by a user entry */ +#define LIMITS_DEF_GROUP 1 /* limit was set by a group entry */ +#define LIMITS_DEF_ALLGROUP 2 /* limit was set by a group entry */ +#define LIMITS_DEF_ALL 3 /* limit was set by an all entry */ +#define LIMITS_DEF_DEFAULT 4 /* limit was set by a default entry */ +#define LIMITS_DEF_KERNEL 5 /* limit was set from /proc/1/limits */ +#define LIMITS_DEF_NONE 6 /* this limit was not set yet */ + +#define LIMIT_RANGE_ERR -1 /* error in specified uid/gid range */ +#define LIMIT_RANGE_NONE 0 /* no range specified */ +#define LIMIT_RANGE_ONE 1 /* exact uid/gid specified (:max_uid)*/ +#define LIMIT_RANGE_MIN 2 /* only minimum uid/gid specified (min_uid:) */ +#define LIMIT_RANGE_MM 3 /* both min and max uid/gid specified (min_uid:max_uid) */ + +static const char *limits_def_names[] = { + "USER", + "GROUP", + "ALLGROUP", + "ALL", + "DEFAULT", + "KERNEL", + "NONE", + NULL +}; + +struct user_limits_struct { + int supported; + int src_soft; + int src_hard; + struct rlimit limit; +}; + +/* internal data */ +struct pam_limit_s { + int login_limit; /* the max logins limit */ + int login_limit_def; /* which entry set the login limit */ + int flag_numsyslogins; /* whether to limit logins only for a + specific user or to count all logins */ + int priority; /* the priority to run user process with */ + int nonewprivs; /* whether to prctl(PR_SET_NO_NEW_PRIVS) */ + struct user_limits_struct limits[RLIM_NLIMITS]; + const char *conf_file; + int utmp_after_pam_call; + char login_group[LINE_LENGTH]; +}; + +#define LIMIT_LOGIN RLIM_NLIMITS+1 +#define LIMIT_NUMSYSLOGINS RLIM_NLIMITS+2 + +#define LIMIT_PRI RLIM_NLIMITS+3 +#define LIMIT_NONEWPRIVS RLIM_NLIMITS+4 + +#define LIMIT_SOFT 1 +#define LIMIT_HARD 2 + +#include +#include +#include +#include +#include "pam_inline.h" + +/* argument parsing */ + +#define PAM_DEBUG_ARG 0x0001 +#define PAM_UTMP_EARLY 0x0004 +#define PAM_NO_AUDIT 0x0008 +#define PAM_SET_ALL 0x0010 + +/* Limits from globbed files. */ +#define LIMITS_CONF_GLOB LIMITS_FILE_DIR + +#define CONF_FILE (pl->conf_file != NULL)?pl->conf_file:LIMITS_FILE + +static int +_pam_parse (const pam_handle_t *pamh, int argc, const char **argv, + struct pam_limit_s *pl) +{ + int ctrl=0; + + /* step through arguments */ + for (ctrl=0; argc-- > 0; ++argv) { + const char *str; + + /* generic options */ + + if (!strcmp(*argv,"debug")) { + ctrl |= PAM_DEBUG_ARG; + } else if ((str = pam_str_skip_prefix(*argv, "conf=")) != NULL) { + pl->conf_file = str; + } else if (!strcmp(*argv,"utmp_early")) { + ctrl |= PAM_UTMP_EARLY; + } else if (!strcmp(*argv,"noaudit")) { + ctrl |= PAM_NO_AUDIT; + } else if (!strcmp(*argv,"set_all")) { + ctrl |= PAM_SET_ALL; + } else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + return ctrl; +} + +static const char * +rlimit2str (int i) +{ + switch (i) { + case RLIMIT_CPU: + return "cpu"; + break; + case RLIMIT_FSIZE: + return "fsize"; + break; + case RLIMIT_DATA: + return "data"; + break; + case RLIMIT_STACK: + return "stack"; + break; + case RLIMIT_CORE: + return "core"; + break; + case RLIMIT_RSS: + return "rss"; + break; + case RLIMIT_NPROC: + return "nproc"; + break; + case RLIMIT_NOFILE: + return "nofile"; + break; + case RLIMIT_MEMLOCK: + return "memlock"; + break; +#ifdef RLIMIT_AS + case RLIMIT_AS: + return "as"; + break; +#endif +#ifdef RLIMIT_LOCKS + case RLIMIT_LOCKS: + return "locks"; + break; +#endif +#ifdef RLIMIT_SIGPENDING + case RLIMIT_SIGPENDING: + return "sigpending"; + break; +#endif +#ifdef RLIMIT_MSGQUEUE + case RLIMIT_MSGQUEUE: + return "msgqueue"; + break; +#endif +#ifdef RLIMIT_NICE + case RLIMIT_NICE: + return "nice"; + break; +#endif +#ifdef RLIMIT_RTPRIO + case RLIMIT_RTPRIO: + return "rtprio"; + break; +#endif + default: + return "UNKNOWN"; + break; + } +} + + +#define LIMITED_OK 0 /* limit setting appeared to work */ +#define LIMIT_ERR 1 /* error setting a limit */ +#define LOGIN_ERR 2 /* too many logins err */ + +/* Counts the number of user logins and check against the limit*/ +static int +check_logins (pam_handle_t *pamh, const char *name, int limit, int ctrl, + struct pam_limit_s *pl) +{ + struct utmp *ut; + int count; + + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, + "checking logins for '%s' (maximum of %d)", name, limit); + } + + if (limit < 0) + return 0; /* no limits imposed */ + if (limit == 0) /* maximum 0 logins ? */ { + pam_syslog(pamh, LOG_WARNING, "No logins allowed for '%s'", name); + return LOGIN_ERR; + } + + setutent(); + + /* Because there is no definition about when an application + actually adds a utmp entry, some applications bizarrely do the + utmp call before the have PAM authenticate them to the system: + you're logged it, sort of...? Anyway, you can use the + "utmp_early" module argument in your PAM config file to make + allowances for this sort of problem. (There should be a PAM + standard for this, since if a module wants to actually map a + username then any early utmp entry will be for the unmapped + name = broken.) */ + + if (ctrl & PAM_UTMP_EARLY) { + count = 0; + } else { + count = 1; + } + + while((ut = getutent())) { +#ifdef USER_PROCESS + if (ut->ut_type != USER_PROCESS) { + continue; + } +#endif + if (ut->UT_USER[0] == '\0') { + continue; + } + if (!pl->flag_numsyslogins) { + char user[sizeof(ut->UT_USER) + 1]; + user[0] = '\0'; + strncat(user, ut->UT_USER, sizeof(ut->UT_USER)); + + if (((pl->login_limit_def == LIMITS_DEF_USER) + || (pl->login_limit_def == LIMITS_DEF_GROUP) + || (pl->login_limit_def == LIMITS_DEF_DEFAULT)) + && strcmp(name, user) != 0) { + continue; + } + if ((pl->login_limit_def == LIMITS_DEF_ALLGROUP) + && !pam_modutil_user_in_group_nam_nam(pamh, user, pl->login_group)) { + continue; + } + if (kill(ut->ut_pid, 0) == -1 && errno == ESRCH) { + /* process does not exist anymore */ + pam_syslog(pamh, LOG_INFO, + "Stale utmp entry (pid %d) for '%s' ignored", + ut->ut_pid, user); + continue; + } + } + if (++count > limit) { + break; + } + } + endutent(); + if (count > limit) { + if (name) { + pam_syslog(pamh, LOG_NOTICE, + "Too many logins (max %d) for %s", limit, name); + } else { + pam_syslog(pamh, LOG_NOTICE, "Too many system logins (max %d)", limit); + } + return LOGIN_ERR; + } + return 0; +} + +static const char *lnames[RLIM_NLIMITS] = { + [RLIMIT_CPU] = "Max cpu time", + [RLIMIT_FSIZE] = "Max file size", + [RLIMIT_DATA] = "Max data size", + [RLIMIT_STACK] = "Max stack size", + [RLIMIT_CORE] = "Max core file size", + [RLIMIT_RSS] = "Max resident set", + [RLIMIT_NPROC] = "Max processes", + [RLIMIT_NOFILE] = "Max open files", + [RLIMIT_MEMLOCK] = "Max locked memory", +#ifdef RLIMIT_AS + [RLIMIT_AS] = "Max address space", +#endif +#ifdef RLIMIT_LOCKS + [RLIMIT_LOCKS] = "Max file locks", +#endif +#ifdef RLIMIT_SIGPENDING + [RLIMIT_SIGPENDING] = "Max pending signals", +#endif +#ifdef RLIMIT_MSGQUEUE + [RLIMIT_MSGQUEUE] = "Max msgqueue size", +#endif +#ifdef RLIMIT_NICE + [RLIMIT_NICE] = "Max nice priority", +#endif +#ifdef RLIMIT_RTPRIO + [RLIMIT_RTPRIO] = "Max realtime priority", +#endif +#ifdef RLIMIT_RTTIME + [RLIMIT_RTTIME] = "Max realtime timeout", +#endif +}; + +static int str2rlimit(char *name) { + int i; + if (!name || *name == '\0') + return -1; + for(i = 0; i < RLIM_NLIMITS; i++) { + if (strcmp(name, lnames[i]) == 0) return i; + } + return -1; +} + +static rlim_t str2rlim_t(char *value) { + unsigned long long rlimit = 0; + + if (!value) return (rlim_t)rlimit; + if (strcmp(value, "unlimited") == 0) { + return RLIM_INFINITY; + } + rlimit = strtoull(value, NULL, 10); + return (rlim_t)rlimit; +} + +#define LIMITS_SKIP_WHITESPACE { \ + /* step backwards over spaces */ \ + pos--; \ + while (pos && line[pos] == ' ') pos--; \ + if (!pos) continue; \ + line[pos+1] = '\0'; \ +} +#define LIMITS_MARK_ITEM(item) { \ + /* step backwards over non-spaces */ \ + pos--; \ + while (pos && line[pos] != ' ') pos--; \ + if (!pos) continue; \ + item = line + pos + 1; \ +} + +static void parse_kernel_limits(pam_handle_t *pamh, struct pam_limit_s *pl, int ctrl) +{ + int i, maxlen = 0; + FILE *limitsfile; + const char *proclimits = "/proc/1/limits"; + char line[256]; + char *hard, *soft, *name; + + if (!(limitsfile = fopen(proclimits, "r"))) { + pam_syslog(pamh, LOG_WARNING, "Could not read %s (%s), using PAM defaults", proclimits, strerror(errno)); + return; + } + + while (fgets(line, 256, limitsfile)) { + int pos = strlen(line); + if (pos < 2) continue; + + /* drop trailing newline */ + if (line[pos-1] == '\n') { + pos--; + line[pos] = '\0'; + } + + /* determine formatting boundary of limits report */ + if (!maxlen && pam_str_skip_prefix(line, "Limit") != NULL) { + maxlen = pos; + continue; + } + + if (pos == maxlen) { + /* step backwards over "Units" name */ + LIMITS_SKIP_WHITESPACE; + LIMITS_MARK_ITEM(hard); /* not a typo, units unused */ + } + + /* step backwards over "Hard Limit" value */ + LIMITS_SKIP_WHITESPACE; + LIMITS_MARK_ITEM(hard); + + /* step backwards over "Soft Limit" value */ + LIMITS_SKIP_WHITESPACE; + LIMITS_MARK_ITEM(soft); + + /* step backwards over name of limit */ + LIMITS_SKIP_WHITESPACE; + name = line; + + i = str2rlimit(name); + if (i < 0 || i >= RLIM_NLIMITS) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_DEBUG, "Unknown kernel rlimit '%s' ignored", name); + continue; + } + pl->limits[i].limit.rlim_cur = str2rlim_t(soft); + pl->limits[i].limit.rlim_max = str2rlim_t(hard); + pl->limits[i].src_soft = LIMITS_DEF_KERNEL; + pl->limits[i].src_hard = LIMITS_DEF_KERNEL; + } + fclose(limitsfile); +} + +static int init_limits(pam_handle_t *pamh, struct pam_limit_s *pl, int ctrl) +{ + int i; + int retval = PAM_SUCCESS; + + D(("called.")); + + for(i = 0; i < RLIM_NLIMITS; i++) { + int r = getrlimit(i, &pl->limits[i].limit); + if (r == -1) { + pl->limits[i].supported = 0; + if (errno != EINVAL) { + retval = !PAM_SUCCESS; + } + } else { + pl->limits[i].supported = 1; + pl->limits[i].src_soft = LIMITS_DEF_NONE; + pl->limits[i].src_hard = LIMITS_DEF_NONE; + } + } + +#ifdef __linux__ + if (ctrl & PAM_SET_ALL) { + parse_kernel_limits(pamh, pl, ctrl); + + for(i = 0; i < RLIM_NLIMITS; i++) { + if (pl->limits[i].supported && + (pl->limits[i].src_soft == LIMITS_DEF_NONE || + pl->limits[i].src_hard == LIMITS_DEF_NONE)) { + pam_syslog(pamh, LOG_WARNING, "Did not find kernel RLIMIT for %s, using PAM default", rlimit2str(i)); + } + } + } +#endif + + errno = 0; + pl->priority = getpriority (PRIO_PROCESS, 0); + if (pl->priority == -1 && errno != 0) + retval = !PAM_SUCCESS; + pl->login_limit = -2; + pl->login_limit_def = LIMITS_DEF_NONE; + + return retval; +} + +/* + * Read the contents of and return it in *valuep + * return 1 if conversion succeeds, result is in *valuep + * return 0 if conversion fails, *valuep is untouched. + */ +static int +value_from_file(const char *pathname, rlim_t *valuep) +{ + char buf[128]; + FILE *fp; + int retval; + + retval = 0; + + if ((fp = fopen(pathname, "r")) != NULL) { + if (fgets(buf, sizeof(buf), fp) != NULL) { + char *endptr; + unsigned long long value; + + errno = 0; + value = strtoull(buf, &endptr, 10); + if (endptr != buf && + (value != ULLONG_MAX || errno == 0) && + (unsigned long long) (rlim_t) value == value) { + *valuep = (rlim_t) value; + retval = 1; + } + } + + fclose(fp); + } + + return retval; +} + +static void +process_limit (const pam_handle_t *pamh, int source, const char *lim_type, + const char *lim_item, const char *lim_value, + int ctrl, struct pam_limit_s *pl) +{ + int limit_item; + int limit_type = 0; + int int_value = 0; + rlim_t rlimit_value = 0; + char *endptr; + const char *value_orig = lim_value; + + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_DEBUG, "%s: processing %s %s %s for %s", + __FUNCTION__, lim_type, lim_item, lim_value, + limits_def_names[source]); + + if (strcmp(lim_item, "cpu") == 0) + limit_item = RLIMIT_CPU; + else if (strcmp(lim_item, "fsize") == 0) + limit_item = RLIMIT_FSIZE; + else if (strcmp(lim_item, "data") == 0) + limit_item = RLIMIT_DATA; + else if (strcmp(lim_item, "stack") == 0) + limit_item = RLIMIT_STACK; + else if (strcmp(lim_item, "core") == 0) + limit_item = RLIMIT_CORE; + else if (strcmp(lim_item, "rss") == 0) + limit_item = RLIMIT_RSS; + else if (strcmp(lim_item, "nproc") == 0) + limit_item = RLIMIT_NPROC; + else if (strcmp(lim_item, "nofile") == 0) + limit_item = RLIMIT_NOFILE; + else if (strcmp(lim_item, "memlock") == 0) + limit_item = RLIMIT_MEMLOCK; +#ifdef RLIMIT_AS + else if (strcmp(lim_item, "as") == 0) + limit_item = RLIMIT_AS; +#endif /*RLIMIT_AS*/ +#ifdef RLIMIT_LOCKS + else if (strcmp(lim_item, "locks") == 0) + limit_item = RLIMIT_LOCKS; +#endif +#ifdef RLIMIT_SIGPENDING + else if (strcmp(lim_item, "sigpending") == 0) + limit_item = RLIMIT_SIGPENDING; +#endif +#ifdef RLIMIT_MSGQUEUE + else if (strcmp(lim_item, "msgqueue") == 0) + limit_item = RLIMIT_MSGQUEUE; +#endif +#ifdef RLIMIT_NICE + else if (strcmp(lim_item, "nice") == 0) + limit_item = RLIMIT_NICE; +#endif +#ifdef RLIMIT_RTPRIO + else if (strcmp(lim_item, "rtprio") == 0) + limit_item = RLIMIT_RTPRIO; +#endif + else if (strcmp(lim_item, "maxlogins") == 0) { + limit_item = LIMIT_LOGIN; + pl->flag_numsyslogins = 0; + } else if (strcmp(lim_item, "maxsyslogins") == 0) { + limit_item = LIMIT_NUMSYSLOGINS; + pl->flag_numsyslogins = 1; + } else if (strcmp(lim_item, "priority") == 0) { + limit_item = LIMIT_PRI; + } else if (strcmp(lim_item, "nonewprivs") == 0) { + limit_item = LIMIT_NONEWPRIVS; + } else { + pam_syslog(pamh, LOG_DEBUG, "unknown limit item '%s'", lim_item); + return; + } + + if (strcmp(lim_type,"soft")==0) + limit_type=LIMIT_SOFT; + else if (strcmp(lim_type, "hard")==0) + limit_type=LIMIT_HARD; + else if (strcmp(lim_type,"-")==0) + limit_type=LIMIT_SOFT | LIMIT_HARD; + else if (limit_item != LIMIT_LOGIN && limit_item != LIMIT_NUMSYSLOGINS + && limit_item != LIMIT_NONEWPRIVS) { + pam_syslog(pamh, LOG_DEBUG, "unknown limit type '%s'", lim_type); + return; + } + if (limit_item == LIMIT_NONEWPRIVS) { + /* just require a bool-style 0 or 1 */ + if (strcmp(lim_value, "0") == 0) { + int_value = 0; + } else if (strcmp(lim_value, "1") == 0) { + int_value = 1; + } else { + pam_syslog(pamh, LOG_DEBUG, + "wrong limit value '%s' for limit type '%s'", + lim_value, lim_type); + } + } else if (limit_item != LIMIT_PRI +#ifdef RLIMIT_NICE + && limit_item != RLIMIT_NICE +#endif + && (strcmp(lim_value, "-1") == 0 + || strcmp(lim_value, "-") == 0 || strcmp(lim_value, "unlimited") == 0 + || strcmp(lim_value, "infinity") == 0)) { + int_value = -1; + rlimit_value = RLIM_INFINITY; + } else if (limit_item == LIMIT_PRI || limit_item == LIMIT_LOGIN || +#ifdef RLIMIT_NICE + limit_item == RLIMIT_NICE || +#endif + limit_item == LIMIT_NUMSYSLOGINS) { + long temp; + temp = strtol (lim_value, &endptr, 10); + temp = temp < INT_MAX ? temp : INT_MAX; + int_value = temp > INT_MIN ? temp : INT_MIN; + if (int_value == 0 && value_orig == endptr) { + pam_syslog(pamh, LOG_DEBUG, + "wrong limit value '%s' for limit type '%s'", + lim_value, lim_type); + return; + } + } else { +#ifdef __USE_FILE_OFFSET64 + rlimit_value = strtoull (lim_value, &endptr, 10); +#else + rlimit_value = strtoul (lim_value, &endptr, 10); +#endif + if (rlimit_value == 0 && value_orig == endptr) { + pam_syslog(pamh, LOG_DEBUG, + "wrong limit value '%s' for limit type '%s'", + lim_value, lim_type); + return; + } + } + + /* one more special case when limiting logins */ + if ((source == LIMITS_DEF_ALL || source == LIMITS_DEF_ALLGROUP) + && (limit_item != LIMIT_LOGIN)) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_DEBUG, + "'%%' domain valid for maxlogins type only"); + return; + } + + switch(limit_item) { + case RLIMIT_CPU: + if (rlimit_value != RLIM_INFINITY) + { + if (rlimit_value >= RLIM_INFINITY/60) + rlimit_value = RLIM_INFINITY; + else + rlimit_value *= 60; + } + break; + case RLIMIT_FSIZE: + case RLIMIT_DATA: + case RLIMIT_STACK: + case RLIMIT_CORE: + case RLIMIT_RSS: + case RLIMIT_MEMLOCK: +#ifdef RLIMIT_AS + case RLIMIT_AS: +#endif + if (rlimit_value != RLIM_INFINITY) + { + if (rlimit_value >= RLIM_INFINITY/1024) + rlimit_value = RLIM_INFINITY; + else + rlimit_value *= 1024; + } + break; +#ifdef RLIMIT_NICE + case RLIMIT_NICE: + if (int_value > 19) + int_value = 19; + if (int_value < -20) + int_value = -20; + rlimit_value = 20 - int_value; + break; +#endif + case RLIMIT_NOFILE: + /* + * If nofile is to be set to "unlimited", try to set it to + * the value in /proc/sys/fs/nr_open instead. + */ + if (rlimit_value == RLIM_INFINITY) { + if (!value_from_file("/proc/sys/fs/nr_open", &rlimit_value)) + pam_syslog(pamh, LOG_WARNING, + "Cannot set \"nofile\" to a sensible value"); + else if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_DEBUG, "Setting \"nofile\" limit to %llu", + (unsigned long long) rlimit_value); + } + break; + } + + if ( (limit_item != LIMIT_LOGIN) + && (limit_item != LIMIT_NUMSYSLOGINS) + && (limit_item != LIMIT_PRI) + && (limit_item != LIMIT_NONEWPRIVS) ) { + if (limit_type & LIMIT_SOFT) { + if (pl->limits[limit_item].src_soft < source) { + return; + } else { + pl->limits[limit_item].limit.rlim_cur = rlimit_value; + pl->limits[limit_item].src_soft = source; + } + } + if (limit_type & LIMIT_HARD) { + if (pl->limits[limit_item].src_hard < source) { + return; + } else { + pl->limits[limit_item].limit.rlim_max = rlimit_value; + pl->limits[limit_item].src_hard = source; + } + } + } else { + /* recent kernels support negative priority limits (=raise priority) */ + + if (limit_item == LIMIT_PRI) { + pl->priority = int_value; + } else if (limit_item == LIMIT_NONEWPRIVS) { + pl->nonewprivs = int_value; + } else { + if (pl->login_limit_def < source) { + return; + } else { + pl->login_limit = int_value; + pl->login_limit_def = source; + } + } + } + return; +} + +static int +parse_uid_range(pam_handle_t *pamh, const char *domain, + uid_t *min_uid, uid_t *max_uid) +{ + const char *range = domain; + char *pmax; + char *endptr; + int rv = LIMIT_RANGE_MM; + + if ((pmax=strchr(range, ':')) == NULL) + return LIMIT_RANGE_NONE; + ++pmax; + + if (range[0] == '@' || range[0] == '%') + ++range; + + if (range[0] == ':') + rv = LIMIT_RANGE_ONE; + else { + errno = 0; + *min_uid = strtoul (range, &endptr, 10); + if (errno != 0 || (range == endptr) || *endptr != ':') { + pam_syslog(pamh, LOG_DEBUG, + "wrong min_uid/gid value in '%s'", domain); + return LIMIT_RANGE_ERR; + } + } + + if (*pmax == '\0') { + if (rv == LIMIT_RANGE_ONE) + return LIMIT_RANGE_ERR; + else + return LIMIT_RANGE_MIN; + } + + errno = 0; + *max_uid = strtoul (pmax, &endptr, 10); + if (errno != 0 || (pmax == endptr) || *endptr != '\0') { + pam_syslog(pamh, LOG_DEBUG, + "wrong max_uid/gid value in '%s'", domain); + return LIMIT_RANGE_ERR; + } + + if (rv == LIMIT_RANGE_ONE) + *min_uid = *max_uid; + return rv; +} + +static int +parse_config_file(pam_handle_t *pamh, const char *uname, uid_t uid, gid_t gid, + int ctrl, struct pam_limit_s *pl) +{ + FILE *fil; + char buf[LINE_LENGTH]; + + /* check for the LIMITS_FILE */ + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_DEBUG, "reading settings from '%s'", CONF_FILE); + fil = fopen(CONF_FILE, "r"); + if (fil == NULL) { + pam_syslog (pamh, LOG_WARNING, + "cannot read settings from %s: %m", CONF_FILE); + return PAM_SERVICE_ERR; + } + + /* start the show */ + while (fgets(buf, LINE_LENGTH, fil) != NULL) { + char domain[LINE_LENGTH]; + char ltype[LINE_LENGTH]; + char item[LINE_LENGTH]; + char value[LINE_LENGTH]; + int i; + int rngtype; + size_t j; + char *tptr,*line; + uid_t min_uid = (uid_t)-1, max_uid = (uid_t)-1; + + line = buf; + /* skip the leading white space */ + while (*line && isspace(*line)) + line++; + + /* Rip off the comments */ + tptr = strchr(line,'#'); + if (tptr) + *tptr = '\0'; + /* Rip off the newline char */ + tptr = strchr(line,'\n'); + if (tptr) + *tptr = '\0'; + /* Anything left ? */ + if (!strlen(line)) + continue; + + domain[0] = ltype[0] = item[0] = value[0] = '\0'; + + i = sscanf(line,"%s%s%s%s", domain, ltype, item, value); + D(("scanned line[%d]: domain[%s], ltype[%s], item[%s], value[%s]", + i, domain, ltype, item, value)); + + for(j=0; j < strlen(ltype); j++) + ltype[j]=tolower(ltype[j]); + + if ((rngtype=parse_uid_range(pamh, domain, &min_uid, &max_uid)) < 0) { + pam_syslog(pamh, LOG_WARNING, "invalid uid range '%s' - skipped", domain); + continue; + } + + if (i == 4) { /* a complete line */ + for(j=0; j < strlen(item); j++) + item[j]=tolower(item[j]); + for(j=0; j < strlen(value); j++) + value[j]=tolower(value[j]); + + if (strcmp(uname, domain) == 0) /* this user have a limit */ + process_limit(pamh, LIMITS_DEF_USER, ltype, item, value, ctrl, pl); + else if (domain[0]=='@') { + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, + "checking if %s is in group %s", + uname, domain + 1); + } + switch(rngtype) { + case LIMIT_RANGE_NONE: + if (pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1)) + process_limit(pamh, LIMITS_DEF_GROUP, ltype, item, value, ctrl, + pl); + break; + case LIMIT_RANGE_ONE: + if (pam_modutil_user_in_group_nam_gid(pamh, uname, (gid_t)max_uid)) + process_limit(pamh, LIMITS_DEF_GROUP, ltype, item, value, ctrl, + pl); + break; + case LIMIT_RANGE_MM: + if (gid > (gid_t)max_uid) + break; + /* fallthrough */ + case LIMIT_RANGE_MIN: + if (gid >= (gid_t)min_uid) + process_limit(pamh, LIMITS_DEF_GROUP, ltype, item, value, ctrl, + pl); + } + } else if (domain[0]=='%') { + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, + "checking if %s is in group %s", + uname, domain + 1); + } + switch(rngtype) { + case LIMIT_RANGE_NONE: + if (strcmp(domain,"%") == 0) + process_limit(pamh, LIMITS_DEF_ALL, ltype, item, value, ctrl, + pl); + else if (pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1)) { + strcpy(pl->login_group, domain+1); + process_limit(pamh, LIMITS_DEF_ALLGROUP, ltype, item, value, ctrl, + pl); + } + break; + case LIMIT_RANGE_ONE: + if (pam_modutil_user_in_group_nam_gid(pamh, uname, (gid_t)max_uid)) { + struct group *grp; + grp = pam_modutil_getgrgid(pamh, (gid_t)max_uid); + strncpy(pl->login_group, grp->gr_name, sizeof(pl->login_group)); + pl->login_group[sizeof(pl->login_group)-1] = '\0'; + process_limit(pamh, LIMITS_DEF_ALLGROUP, ltype, item, value, ctrl, + pl); + } + break; + case LIMIT_RANGE_MIN: + case LIMIT_RANGE_MM: + pam_syslog(pamh, LOG_WARNING, "range unsupported for %%group matching - ignored"); + } + } else { + switch(rngtype) { + case LIMIT_RANGE_NONE: + if (strcmp(domain, "*") == 0) + process_limit(pamh, LIMITS_DEF_DEFAULT, ltype, item, value, ctrl, + pl); + break; + case LIMIT_RANGE_ONE: + if (uid != max_uid) + break; + /* fallthrough */ + case LIMIT_RANGE_MM: + if (uid > max_uid) + break; + /* fallthrough */ + case LIMIT_RANGE_MIN: + if (uid >= min_uid) + process_limit(pamh, LIMITS_DEF_USER, ltype, item, value, ctrl, pl); + } + } + } else if (i == 2 && ltype[0] == '-') { /* Probably a no-limit line */ + if (strcmp(uname, domain) == 0) { + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, "no limits for '%s'", uname); + } + } else if (domain[0] == '@') { + switch(rngtype) { + case LIMIT_RANGE_NONE: + if (!pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1)) + continue; /* next line */ + break; + case LIMIT_RANGE_ONE: + if (!pam_modutil_user_in_group_nam_gid(pamh, uname, (gid_t)max_uid)) + continue; /* next line */ + break; + case LIMIT_RANGE_MM: + if (gid > (gid_t)max_uid) + continue; /* next line */ + /* fallthrough */ + case LIMIT_RANGE_MIN: + if (gid < (gid_t)min_uid) + continue; /* next line */ + } + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, + "no limits for '%s' in group '%s'", + uname, domain+1); + } + } else { + switch(rngtype) { + case LIMIT_RANGE_NONE: + continue; /* next line */ + case LIMIT_RANGE_ONE: + if (uid != max_uid) + continue; /* next line */ + break; + case LIMIT_RANGE_MM: + if (uid > max_uid) + continue; /* next line */ + /* fallthrough */ + case LIMIT_RANGE_MIN: + if (uid >= min_uid) + break; + continue; /* next line */ + } + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, "no limits for '%s'", uname); + } + } + fclose(fil); + return PAM_IGNORE; + } else { + pam_syslog(pamh, LOG_WARNING, "invalid line '%s' - skipped", line); + } + } + fclose(fil); + return PAM_SUCCESS; +} + +static int setup_limits(pam_handle_t *pamh, + const char *uname, uid_t uid, int ctrl, + struct pam_limit_s *pl) +{ + int i; + int status; + int retval = LIMITED_OK; + + for (i=0, status=LIMITED_OK; ilimits[i].supported) { + /* skip it if its not known to the system */ + continue; + } + if (pl->limits[i].src_soft == LIMITS_DEF_NONE && + pl->limits[i].src_hard == LIMITS_DEF_NONE) { + /* skip it if its not initialized */ + continue; + } + if (pl->limits[i].limit.rlim_cur > pl->limits[i].limit.rlim_max) + pl->limits[i].limit.rlim_cur = pl->limits[i].limit.rlim_max; + res = setrlimit(i, &pl->limits[i].limit); + if (res != 0) + pam_syslog(pamh, LOG_ERR, "Could not set limit for '%s': %m", + rlimit2str(i)); + status |= res; + } + + if (status) { + retval = LIMIT_ERR; + } + + status = setpriority(PRIO_PROCESS, 0, pl->priority); + if (status != 0) { + pam_syslog(pamh, LOG_ERR, "Could not set limit for PRIO_PROCESS: %m"); + retval = LIMIT_ERR; + } + + if (uid == 0) { + D(("skip login limit check for uid=0")); + } else if (pl->login_limit > 0) { + if (check_logins(pamh, uname, pl->login_limit, ctrl, pl) == LOGIN_ERR) { +#ifdef HAVE_LIBAUDIT + if (!(ctrl & PAM_NO_AUDIT)) { + pam_modutil_audit_write(pamh, AUDIT_ANOM_LOGIN_SESSIONS, + "pam_limits", PAM_PERM_DENIED); + /* ignore return value as we fail anyway */ + } +#endif + retval |= LOGIN_ERR; + } + } else if (pl->login_limit == 0) { + retval |= LOGIN_ERR; + } + + if (pl->nonewprivs) { + if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) { + pam_syslog(pamh, LOG_ERR, "Could not set prctl(PR_SET_NO_NEW_PRIVS): %m"); + retval |= LIMIT_ERR; + } + } + + return retval; +} + +/* now the session stuff */ +int +pam_sm_open_session (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int retval; + int i; + int glob_rc; + char *user_name; + struct passwd *pwd; + int ctrl; + struct pam_limit_s plstruct; + struct pam_limit_s *pl = &plstruct; + glob_t globbuf; + const char *oldlocale; + + D(("called.")); + + memset(pl, 0, sizeof(*pl)); + memset(&globbuf, 0, sizeof(globbuf)); + + ctrl = _pam_parse(pamh, argc, argv, pl); + retval = pam_get_item( pamh, PAM_USER, (void*) &user_name ); + if ( user_name == NULL || retval != PAM_SUCCESS ) { + pam_syslog(pamh, LOG_ERR, "open_session - error recovering username"); + return PAM_SESSION_ERR; + } + + pwd = pam_modutil_getpwnam(pamh, user_name); + if (!pwd) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_WARNING, + "open_session username '%s' does not exist", user_name); + return PAM_USER_UNKNOWN; + } + + retval = init_limits(pamh, pl, ctrl); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "cannot initialize"); + return PAM_ABORT; + } + + retval = parse_config_file(pamh, pwd->pw_name, pwd->pw_uid, pwd->pw_gid, ctrl, pl); + if (retval == PAM_IGNORE) { + D(("the configuration file ('%s') has an applicable ' -' entry", CONF_FILE)); + return PAM_SUCCESS; + } + if (retval != PAM_SUCCESS || pl->conf_file != NULL) + /* skip reading limits.d if config file explicitly specified */ + goto out; + + /* Read subsequent *.conf files, if they exist. */ + + /* set the LC_COLLATE so the sorting order doesn't depend + on system locale */ + + oldlocale = setlocale(LC_COLLATE, "C"); + glob_rc = glob(LIMITS_CONF_GLOB, GLOB_ERR, NULL, &globbuf); + + if (oldlocale != NULL) + setlocale (LC_COLLATE, oldlocale); + + if (!glob_rc) { + /* Parse the *.conf files. */ + for (i = 0; globbuf.gl_pathv[i] != NULL; i++) { + pl->conf_file = globbuf.gl_pathv[i]; + retval = parse_config_file(pamh, pwd->pw_name, pwd->pw_uid, pwd->pw_gid, ctrl, pl); + if (retval == PAM_IGNORE) { + D(("the configuration file ('%s') has an applicable ' -' entry", pl->conf_file)); + globfree(&globbuf); + return PAM_SUCCESS; + } + if (retval != PAM_SUCCESS) + goto out; + } + } + +out: + globfree(&globbuf); + if (retval != PAM_SUCCESS) + { + pam_syslog(pamh, LOG_ERR, "error parsing the configuration file: '%s' ",CONF_FILE); + return retval; + } + + retval = setup_limits(pamh, pwd->pw_name, pwd->pw_uid, ctrl, pl); + if (retval & LOGIN_ERR) + pam_error(pamh, _("There were too many logins for '%s'."), + pwd->pw_name); + if (retval != LIMITED_OK) { + return PAM_PERM_DENIED; + } + + return PAM_SUCCESS; +} + +int +pam_sm_close_session (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + /* nothing to do */ + return PAM_SUCCESS; +} + +/* + * Copyright (c) Cristian Gafton, 1996-1997, + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ diff --git a/modules/pam_limits/tst-pam_limits b/modules/pam_limits/tst-pam_limits new file mode 100755 index 0000000..f563beb --- /dev/null +++ b/modules/pam_limits/tst-pam_limits @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_limits.so -- cgit v1.2.3