From de848d9e9146434817c65d74d1d0313e9d729462 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 14:01:37 +0200 Subject: Adding upstream version 1.4.0. Signed-off-by: Daniel Baumann --- modules/pam_lastlog/Makefile.am | 33 + modules/pam_lastlog/Makefile.in | 1146 +++++++++++++++++++++++++++++++++ modules/pam_lastlog/README | 96 +++ modules/pam_lastlog/README.xml | 41 ++ modules/pam_lastlog/pam_lastlog.8 | 197 ++++++ modules/pam_lastlog/pam_lastlog.8.xml | 343 ++++++++++ modules/pam_lastlog/pam_lastlog.c | 804 +++++++++++++++++++++++ modules/pam_lastlog/tst-pam_lastlog | 2 + 8 files changed, 2662 insertions(+) create mode 100644 modules/pam_lastlog/Makefile.am create mode 100644 modules/pam_lastlog/Makefile.in create mode 100644 modules/pam_lastlog/README create mode 100644 modules/pam_lastlog/README.xml create mode 100644 modules/pam_lastlog/pam_lastlog.8 create mode 100644 modules/pam_lastlog/pam_lastlog.8.xml create mode 100644 modules/pam_lastlog/pam_lastlog.c create mode 100755 modules/pam_lastlog/tst-pam_lastlog (limited to 'modules/pam_lastlog') diff --git a/modules/pam_lastlog/Makefile.am b/modules/pam_lastlog/Makefile.am new file mode 100644 index 0000000..dc0c7c4 --- /dev/null +++ b/modules/pam_lastlog/Makefile.am @@ -0,0 +1,33 @@ +# +# Copyright (c) 2005, 2006, 2009 Thorsten Kukuk +# + +CLEANFILES = *~ +MAINTAINERCLEANFILES = $(MANS) README + +EXTRA_DIST = $(XMLS) + +if HAVE_DOC +dist_man_MANS = pam_lastlog.8 +endif +XMLS = README.xml pam_lastlog.8.xml +dist_check_SCRIPTS = tst-pam_lastlog +TESTS = $(dist_check_SCRIPTS) + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + $(WARN_CFLAGS) +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_lastlog.la +pam_lastlog_la_LIBADD = $(top_builddir)/libpam/libpam.la -lutil + +if ENABLE_REGENERATE_MAN +dist_noinst_DATA = README +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_lastlog/Makefile.in b/modules/pam_lastlog/Makefile.in new file mode 100644 index 0000000..85de1bb --- /dev/null +++ b/modules/pam_lastlog/Makefile.in @@ -0,0 +1,1146 @@ +# Makefile.in generated by automake 1.16.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2018 Free Software Foundation, Inc. + +# This Makefile.in is free software; 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In addition, the module maintains the /var/log/lastlog file. + +Some applications may perform this function themselves. In such cases, this +module is not necessary. + +The module checks LASTLOG_UID_MAX option in /etc/login.defs and does not update +or display last login records for users with UID higher than its value. If the +option is not present or its value is invalid, no user ID limit is applied. + +If the module is called in the auth or account phase, the accounts that were +not used recently enough will be disallowed to log in. The check is not +performed for the root account so the root is never locked out. It is also not +performed for users with UID higher than the LASTLOG_UID_MAX value. + +OPTIONS + +debug + + Print debug information. + +silent + + Don't inform the user about any previous login, just update the /var/log/ + lastlog file. This option does not affect display of bad login attempts. + +never + + If the /var/log/lastlog file does not contain any old entries for the user, + indicate that the user has never previously logged in with a welcome + message. + +nodate + + Don't display the date of the last login. + +noterm + + Don't display the terminal name on which the last login was attempted. + +nohost + + Don't indicate from which host the last login was attempted. + +nowtmp + + Don't update the wtmp entry. + +noupdate + + Don't update any file. + +showfailed + + Display number of failed login attempts and the date of the last failed + attempt from btmp. The date is not displayed when nodate is specified. + +inactive= + + This option is specific for the auth or account phase. It specifies the + number of days after the last login of the user when the user will be + locked out by the module. The default value is 90. + +unlimited + + If the fsize limit is set, this option can be used to override it, + preventing failures on systems with large UID values that lead lastlog to + become a huge sparse file. + +EXAMPLES + +Add the following line to /etc/pam.d/login to display the last login time of an +user: + + session required pam_lastlog.so nowtmp + + +To reject the user if he did not login during the previous 50 days the +following line can be used: + + auth required pam_lastlog.so inactive=50 + + +AUTHOR + +pam_lastlog was written by Andrew G. Morgan . + +Inactive account lock out added by Tomáš Mráz . + diff --git a/modules/pam_lastlog/README.xml b/modules/pam_lastlog/README.xml new file mode 100644 index 0000000..7fe7033 --- /dev/null +++ b/modules/pam_lastlog/README.xml @@ -0,0 +1,41 @@ + + +--> +]> + +
+ + + + + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_lastlog.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_lastlog-name"]/*)'/> + + + + +
+ +
+ +
+ +
+ +
+ +
+ +
+ +
+ +
diff --git a/modules/pam_lastlog/pam_lastlog.8 b/modules/pam_lastlog/pam_lastlog.8 new file mode 100644 index 0000000..f21038e --- /dev/null +++ b/modules/pam_lastlog/pam_lastlog.8 @@ -0,0 +1,197 @@ +'\" t +.\" Title: pam_lastlog +.\" Author: [see the "AUTHOR" section] +.\" Generator: DocBook XSL Stylesheets v1.79.1 +.\" Date: 06/08/2020 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "PAM_LASTLOG" "8" "06/08/2020" "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_lastlog \- PAM module to display date of last login and perform inactive account lock out +.SH "SYNOPSIS" +.HP \w'\fBpam_lastlog\&.so\fR\ 'u +\fBpam_lastlog\&.so\fR [debug] [silent] [never] [nodate] [nohost] [noterm] [nowtmp] [noupdate] [showfailed] [inactive=] [unlimited] +.SH "DESCRIPTION" +.PP +pam_lastlog is a PAM module to display a line of information about the last login of the user\&. In addition, the module maintains the +/var/log/lastlog +file\&. +.PP +Some applications may perform this function themselves\&. In such cases, this module is not necessary\&. +.PP +The module checks +\fBLASTLOG_UID_MAX\fR +option in +/etc/login\&.defs +and does not update or display last login records for users with UID higher than its value\&. If the option is not present or its value is invalid, no user ID limit is applied\&. +.PP +If the module is called in the auth or account phase, the accounts that were not used recently enough will be disallowed to log in\&. The check is not performed for the root account so the root is never locked out\&. It is also not performed for users with UID higher than the +\fBLASTLOG_UID_MAX\fR +value\&. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Print debug information\&. +.RE +.PP +\fBsilent\fR +.RS 4 +Don\*(Aqt inform the user about any previous login, just update the +/var/log/lastlog +file\&. This option does not affect display of bad login attempts\&. +.RE +.PP +\fBnever\fR +.RS 4 +If the +/var/log/lastlog +file does not contain any old entries for the user, indicate that the user has never previously logged in with a welcome message\&. +.RE +.PP +\fBnodate\fR +.RS 4 +Don\*(Aqt display the date of the last login\&. +.RE +.PP +\fBnoterm\fR +.RS 4 +Don\*(Aqt display the terminal name on which the last login was attempted\&. +.RE +.PP +\fBnohost\fR +.RS 4 +Don\*(Aqt indicate from which host the last login was attempted\&. +.RE +.PP +\fBnowtmp\fR +.RS 4 +Don\*(Aqt update the wtmp entry\&. +.RE +.PP +\fBnoupdate\fR +.RS 4 +Don\*(Aqt update any file\&. +.RE +.PP +\fBshowfailed\fR +.RS 4 +Display number of failed login attempts and the date of the last failed attempt from btmp\&. The date is not displayed when +\fBnodate\fR +is specified\&. +.RE +.PP +\fBinactive=\fR +.RS 4 +This option is specific for the auth or account phase\&. It specifies the number of days after the last login of the user when the user will be locked out by the module\&. The default value is 90\&. +.RE +.PP +\fBunlimited\fR +.RS 4 +If the +\fIfsize\fR +limit is set, this option can be used to override it, preventing failures on systems with large UID values that lead lastlog to become a huge sparse file\&. +.RE +.SH "MODULE TYPES PROVIDED" +.PP +The +\fBauth\fR +and +\fBaccount\fR +module type allows one to lock out users who did not login recently enough\&. The +\fBsession\fR +module type is provided for displaying the information about the last login and/or updating the lastlog and wtmp files\&. +.SH "RETURN VALUES" +.PP +.PP +PAM_SUCCESS +.RS 4 +Everything was successful\&. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Internal service module error\&. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known\&. +.RE +.PP +PAM_AUTH_ERR +.RS 4 +User locked out in the auth or account phase due to inactivity\&. +.RE +.PP +PAM_IGNORE +.RS 4 +There was an error during reading the lastlog file in the auth or account phase and thus inactivity of the user cannot be determined\&. +.RE +.SH "EXAMPLES" +.PP +Add the following line to +/etc/pam\&.d/login +to display the last login time of an user: +.sp +.if n \{\ +.RS 4 +.\} +.nf + session required pam_lastlog\&.so nowtmp + +.fi +.if n \{\ +.RE +.\} +.PP +To reject the user if he did not login during the previous 50 days the following line can be used: +.sp +.if n \{\ +.RS 4 +.\} +.nf + auth required pam_lastlog\&.so inactive=50 + +.fi +.if n \{\ +.RE +.\} +.SH "FILES" +.PP +/var/log/lastlog +.RS 4 +Lastlog logging file +.RE +.SH "SEE ALSO" +.PP +\fBlimits.conf\fR(5), +\fBpam.conf\fR(5), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_lastlog was written by Andrew G\&. Morgan \&. +.PP +Inactive account lock out added by Tomáš Mráz \&. diff --git a/modules/pam_lastlog/pam_lastlog.8.xml b/modules/pam_lastlog/pam_lastlog.8.xml new file mode 100644 index 0000000..a2f14fc --- /dev/null +++ b/modules/pam_lastlog/pam_lastlog.8.xml @@ -0,0 +1,343 @@ + + + + + + + pam_lastlog + 8 + Linux-PAM Manual + + + + pam_lastlog + PAM module to display date of last login and perform inactive account lock out + + + + + pam_lastlog.so + + debug + + + silent + + + never + + + nodate + + + nohost + + + noterm + + + nowtmp + + + noupdate + + + showfailed + + + inactive=<days> + + + unlimited + + + + + + + DESCRIPTION + + + pam_lastlog is a PAM module to display a line of information + about the last login of the user. In addition, the module maintains + the /var/log/lastlog file. + + + Some applications may perform this function themselves. In such + cases, this module is not necessary. + + + The module checks option in + /etc/login.defs and does not update or display + last login records for users with UID higher than its value. + If the option is not present or its value is invalid, no user ID + limit is applied. + + + If the module is called in the auth or account phase, the accounts that + were not used recently enough will be disallowed to log in. The + check is not performed for the root account so the root is never + locked out. It is also not performed for users with UID higher + than the value. + + + + + + OPTIONS + + + + + + + + Print debug information. + + + + + + + + + + Don't inform the user about any previous login, + just update the /var/log/lastlog file. + This option does not affect display of bad login attempts. + + + + + + + + + + If the /var/log/lastlog file does + not contain any old entries for the user, indicate that + the user has never previously logged in with a welcome + message. + + + + + + + + + + Don't display the date of the last login. + + + + + + + + + + Don't display the terminal name on which the + last login was attempted. + + + + + + + + + + Don't indicate from which host the last login was + attempted. + + + + + + + + + + Don't update the wtmp entry. + + + + + + + + + + Don't update any file. + + + + + + + + + + Display number of failed login attempts and the date of the + last failed attempt from btmp. The date is not displayed + when is specified. + + + + + + + + + + This option is specific for the auth or account phase. It + specifies the number of days after the last login of the user + when the user will be locked out by the module. The default + value is 90. + + + + + + + + + + If the fsize limit is set, this option can be + used to override it, preventing failures on systems with large UID + values that lead lastlog to become a huge sparse file. + + + + + + + + MODULE TYPES PROVIDED + + The and module type + allows one to lock out users who did not login recently enough. + The module type is provided for displaying + the information about the last login and/or updating the lastlog and + wtmp files. + + + + + RETURN VALUES + + + + + PAM_SUCCESS + + + Everything was successful. + + + + + + PAM_SERVICE_ERR + + + Internal service module error. + + + + + + PAM_USER_UNKNOWN + + + User not known. + + + + + + PAM_AUTH_ERR + + + User locked out in the auth or account phase due to + inactivity. + + + + + + PAM_IGNORE + + + There was an error during reading the lastlog file + in the auth or account phase and thus inactivity + of the user cannot be determined. + + + + + + + + + + EXAMPLES + + Add the following line to /etc/pam.d/login to + display the last login time of an user: + + + session required pam_lastlog.so nowtmp + + + To reject the user if he did not login during the previous 50 days + the following line can be used: + + + auth required pam_lastlog.so inactive=50 + + + + + FILES + + + /var/log/lastlog + + Lastlog logging file + + + + + + + SEE ALSO + + + limits.conf5 + , + + pam.conf5 + , + + pam.d5 + , + + pam8 + + + + + + AUTHOR + + pam_lastlog was written by Andrew G. Morgan <morgan@kernel.org>. + + + Inactive account lock out added by Tomáš Mráz <tm@t8m.info>. + + + + diff --git a/modules/pam_lastlog/pam_lastlog.c b/modules/pam_lastlog/pam_lastlog.c new file mode 100644 index 0000000..abd048d --- /dev/null +++ b/modules/pam_lastlog/pam_lastlog.c @@ -0,0 +1,804 @@ +/* + * pam_lastlog module + * + * Written by Andrew Morgan 1996/3/11 + * + * This module does the necessary work to display the last login + * time+date for this user, it then updates this entry for the + * present (login) service. + */ + +#include "config.h" + +#include +#include +#include +#ifdef HAVE_UTMP_H +# include +#else +# include +#endif +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#if defined(hpux) || defined(sunos) || defined(solaris) +# ifndef _PATH_LASTLOG +# define _PATH_LASTLOG "/usr/adm/lastlog" +# endif /* _PATH_LASTLOG */ +# ifndef UT_HOSTSIZE +# define UT_HOSTSIZE 16 +# endif /* UT_HOSTSIZE */ +# ifndef UT_LINESIZE +# define UT_LINESIZE 12 +# endif /* UT_LINESIZE */ +#endif +#if defined(hpux) +struct lastlog { + time_t ll_time; + char ll_line[UT_LINESIZE]; + char ll_host[UT_HOSTSIZE]; /* same as in utmp */ +}; +#endif /* hpux */ + +#ifndef _PATH_BTMP +# define _PATH_BTMP "/var/log/btmp" +#endif + +#ifndef PATH_LOGIN_DEFS +# define PATH_LOGIN_DEFS "/etc/login.defs" +#endif + +/* XXX - time before ignoring lock. Is 1 sec enough? */ +#define LASTLOG_IGNORE_LOCK_TIME 1 + +#define DEFAULT_HOST "" /* "[no.where]" */ +#define DEFAULT_TERM "" /* "tt???" */ + +#define DEFAULT_INACTIVE_DAYS 90 +#define MAX_INACTIVE_DAYS 100000 + +#include +#include +#include +#include +#include "pam_inline.h" + +/* argument parsing */ + +#define LASTLOG_DATE 01 /* display the date of the last login */ +#define LASTLOG_HOST 02 /* display the last host used (if set) */ +#define LASTLOG_LINE 04 /* display the last terminal used */ +#define LASTLOG_NEVER 010 /* display a welcome message for first login */ +#define LASTLOG_DEBUG 020 /* send info to syslog(3) */ +#define LASTLOG_QUIET 040 /* keep quiet about things */ +#define LASTLOG_WTMP 0100 /* log to wtmp as well as lastlog */ +#define LASTLOG_BTMP 0200 /* display failed login info from btmp */ +#define LASTLOG_UPDATE 0400 /* update the lastlog and wtmp files (default) */ +#define LASTLOG_UNLIMITED 01000 /* unlimited file size (ignore 'fsize' limit) */ + +static int +_pam_auth_parse(pam_handle_t *pamh, int flags, int argc, const char **argv, + time_t *inactive) +{ + int ctrl = 0; + + *inactive = DEFAULT_INACTIVE_DAYS; + + /* does the application require quiet? */ + if (flags & PAM_SILENT) { + ctrl |= LASTLOG_QUIET; + } + + /* step through arguments */ + for (; argc-- > 0; ++argv) { + const char *str; + char *ep = NULL; + long l; + + if (!strcmp(*argv,"debug")) { + ctrl |= LASTLOG_DEBUG; + } else if (!strcmp(*argv,"silent")) { + ctrl |= LASTLOG_QUIET; + } else if ((str = pam_str_skip_prefix(*argv, "inactive=")) != NULL) { + l = strtol(str, &ep, 10); + if (ep != str && l > 0 && l < MAX_INACTIVE_DAYS) + *inactive = l; + else { + pam_syslog(pamh, LOG_ERR, "bad option value: %s", *argv); + } + } else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + D(("ctrl = %o", ctrl)); + return ctrl; +} + +static int +_pam_session_parse(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + int ctrl=(LASTLOG_DATE|LASTLOG_HOST|LASTLOG_LINE|LASTLOG_WTMP|LASTLOG_UPDATE); + + /* step through arguments */ + for (; argc-- > 0; ++argv) { + + /* generic options */ + + if (!strcmp(*argv,"debug")) { + ctrl |= LASTLOG_DEBUG; + } else if (!strcmp(*argv,"nodate")) { + ctrl &= ~LASTLOG_DATE; + } else if (!strcmp(*argv,"noterm")) { + ctrl &= ~LASTLOG_LINE; + } else if (!strcmp(*argv,"nohost")) { + ctrl &= ~LASTLOG_HOST; + } else if (!strcmp(*argv,"silent")) { + ctrl |= LASTLOG_QUIET; + } else if (!strcmp(*argv,"never")) { + ctrl |= LASTLOG_NEVER; + } else if (!strcmp(*argv,"nowtmp")) { + ctrl &= ~LASTLOG_WTMP; + } else if (!strcmp(*argv,"noupdate")) { + ctrl &= ~(LASTLOG_WTMP|LASTLOG_UPDATE); + } else if (!strcmp(*argv,"showfailed")) { + ctrl |= LASTLOG_BTMP; + } else if (!strcmp(*argv,"unlimited")) { + ctrl |= LASTLOG_UNLIMITED; + } else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + /* does the application require quiet? */ + if (flags & PAM_SILENT) { + ctrl |= LASTLOG_QUIET; + ctrl &= ~LASTLOG_BTMP; + } + + D(("ctrl = %o", ctrl)); + return ctrl; +} + +static const char * +get_tty(pam_handle_t *pamh) +{ + const void *void_terminal_line = NULL; + const char *terminal_line; + const char *str; + + if (pam_get_item(pamh, PAM_TTY, &void_terminal_line) != PAM_SUCCESS + || void_terminal_line == NULL) { + terminal_line = DEFAULT_TERM; + } else { + terminal_line = void_terminal_line; + } + + /* strip leading "/dev/" from tty. */ + str = pam_str_skip_prefix(terminal_line, "/dev/"); + if (str != NULL) + terminal_line = str; + + D(("terminal = %s", terminal_line)); + return terminal_line; +} + +#define MAX_UID_VALUE 0xFFFFFFFFUL + +static uid_t +get_lastlog_uid_max(pam_handle_t *pamh) +{ + uid_t uid_max = MAX_UID_VALUE; + unsigned long ul; + char *s, *ep; + + s = pam_modutil_search_key(pamh, PATH_LOGIN_DEFS, "LASTLOG_UID_MAX"); + if (s == NULL) + return uid_max; + + ep = s + strlen(s); + while (ep > s && isspace(*(--ep))) { + *ep = '\0'; + } + errno = 0; + ul = strtoul(s, &ep, 10); + if (!(ul >= MAX_UID_VALUE + || (uid_t)ul >= MAX_UID_VALUE + || (errno != 0 && ul == 0) + || s == ep + || *ep != '\0')) { + uid_max = (uid_t)ul; + } + free(s); + + return uid_max; +} + +static int +last_login_open(pam_handle_t *pamh, int announce, uid_t uid) +{ + int last_fd; + + /* obtain the last login date and all the relevant info */ + last_fd = open(_PATH_LASTLOG, announce&LASTLOG_UPDATE ? O_RDWR : O_RDONLY); + if (last_fd < 0) { + if (errno == ENOENT && (announce & LASTLOG_UPDATE)) { + last_fd = open(_PATH_LASTLOG, O_RDWR|O_CREAT, + S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); + if (last_fd < 0) { + pam_syslog(pamh, LOG_ERR, + "unable to create %s: %m", _PATH_LASTLOG); + D(("unable to create %s file", _PATH_LASTLOG)); + return -1; + } + pam_syslog(pamh, LOG_NOTICE, + "file %s created", _PATH_LASTLOG); + D(("file %s created", _PATH_LASTLOG)); + } else { + pam_syslog(pamh, LOG_ERR, "unable to open %s: %m", _PATH_LASTLOG); + D(("unable to open %s file", _PATH_LASTLOG)); + return -1; + } + } + + if (lseek(last_fd, sizeof(struct lastlog) * (off_t) uid, SEEK_SET) < 0) { + pam_syslog(pamh, LOG_ERR, "failed to lseek %s: %m", _PATH_LASTLOG); + D(("unable to lseek %s file", _PATH_LASTLOG)); + close(last_fd); + return -1; + } + + return last_fd; +} + + +static int +last_login_read(pam_handle_t *pamh, int announce, int last_fd, uid_t uid, time_t *lltime) +{ + struct flock last_lock; + struct lastlog last_login; + int retval = PAM_SUCCESS; + char the_time[256]; + char *date = NULL; + char *host = NULL; + char *line = NULL; + + memset(&last_lock, 0, sizeof(last_lock)); + last_lock.l_type = F_RDLCK; + last_lock.l_whence = SEEK_SET; + last_lock.l_start = sizeof(last_login) * (off_t) uid; + last_lock.l_len = sizeof(last_login); + + if (fcntl(last_fd, F_SETLK, &last_lock) < 0) { + D(("locking %s failed..(waiting a little)", _PATH_LASTLOG)); + pam_syslog(pamh, LOG_WARNING, + "file %s is locked/read", _PATH_LASTLOG); + sleep(LASTLOG_IGNORE_LOCK_TIME); + } + + if (pam_modutil_read(last_fd, (char *) &last_login, + sizeof(last_login)) != sizeof(last_login)) { + memset(&last_login, 0, sizeof(last_login)); + } + + last_lock.l_type = F_UNLCK; + (void) fcntl(last_fd, F_SETLK, &last_lock); /* unlock */ + + *lltime = last_login.ll_time; + if (!last_login.ll_time) { + if (announce & LASTLOG_DEBUG) { + pam_syslog(pamh, LOG_DEBUG, + "first login for user with uid %lu", + (unsigned long int)uid); + } + } + + if (!(announce & LASTLOG_QUIET)) { + + if (last_login.ll_time) { + + /* we want the date? */ + if (announce & LASTLOG_DATE) { + struct tm *tm, tm_buf; + time_t ll_time; + + ll_time = last_login.ll_time; + if ((tm = localtime_r (&ll_time, &tm_buf)) != NULL) { + strftime (the_time, sizeof (the_time), + /* TRANSLATORS: "strftime options for date of last login" */ + _(" %a %b %e %H:%M:%S %Z %Y"), tm); + date = the_time; + } + } + + /* we want & have the host? */ + if ((announce & LASTLOG_HOST) + && (last_login.ll_host[0] != '\0')) { + /* TRANSLATORS: " from " */ + if (asprintf(&host, _(" from %.*s"), UT_HOSTSIZE, + last_login.ll_host) < 0) { + pam_syslog(pamh, LOG_CRIT, "out of memory"); + retval = PAM_BUF_ERR; + goto cleanup; + } + } + + /* we want and have the terminal? */ + if ((announce & LASTLOG_LINE) + && (last_login.ll_line[0] != '\0')) { + /* TRANSLATORS: " on " */ + if (asprintf(&line, _(" on %.*s"), UT_LINESIZE, + last_login.ll_line) < 0) { + pam_syslog(pamh, LOG_CRIT, "out of memory"); + retval = PAM_BUF_ERR; + goto cleanup; + } + } + + if (date != NULL || host != NULL || line != NULL) + /* TRANSLATORS: "Last login: from on " */ + retval = pam_info(pamh, _("Last login:%s%s%s"), + date ? date : "", + host ? host : "", + line ? line : ""); + } else if (announce & LASTLOG_NEVER) { + D(("this is the first time this user has logged in")); + retval = pam_info(pamh, "%s", _("Welcome to your new account!")); + } + } + + /* cleanup */ + cleanup: + memset(&last_login, 0, sizeof(last_login)); + _pam_overwrite(date); + _pam_overwrite(host); + _pam_drop(host); + _pam_overwrite(line); + _pam_drop(line); + + return retval; +} + +static int +last_login_write(pam_handle_t *pamh, int announce, int last_fd, + uid_t uid, const char *user) +{ + static struct rlimit no_limit = { + RLIM_INFINITY, + RLIM_INFINITY + }; + struct rlimit old_limit; + int setrlimit_res; + struct flock last_lock; + struct lastlog last_login; + time_t ll_time; + const void *void_remote_host = NULL; + const char *remote_host; + const char *terminal_line; + int retval = PAM_SUCCESS; + + /* rewind */ + if (lseek(last_fd, sizeof(last_login) * (off_t) uid, SEEK_SET) < 0) { + pam_syslog(pamh, LOG_ERR, "failed to lseek %s: %m", _PATH_LASTLOG); + return PAM_SERVICE_ERR; + } + + memset(&last_login, 0, sizeof(last_login)); + + /* set this login date */ + D(("set the most recent login time")); + (void) time(&ll_time); /* set the time */ + last_login.ll_time = ll_time; + + /* set the remote host */ + if (pam_get_item(pamh, PAM_RHOST, &void_remote_host) != PAM_SUCCESS + || void_remote_host == NULL) { + remote_host = DEFAULT_HOST; + } else { + remote_host = void_remote_host; + } + + /* copy to last_login */ + strncat(last_login.ll_host, remote_host, sizeof(last_login.ll_host)-1); + + /* set the terminal line */ + terminal_line = get_tty(pamh); + + /* copy to last_login */ + strncat(last_login.ll_line, terminal_line, sizeof(last_login.ll_line)-1); + terminal_line = NULL; + + D(("locking lastlog file")); + + /* now we try to lock this file-record exclusively; non-blocking */ + memset(&last_lock, 0, sizeof(last_lock)); + last_lock.l_type = F_WRLCK; + last_lock.l_whence = SEEK_SET; + last_lock.l_start = sizeof(last_login) * (off_t) uid; + last_lock.l_len = sizeof(last_login); + + if (fcntl(last_fd, F_SETLK, &last_lock) < 0) { + D(("locking %s failed..(waiting a little)", _PATH_LASTLOG)); + pam_syslog(pamh, LOG_WARNING, "file %s is locked/write", _PATH_LASTLOG); + sleep(LASTLOG_IGNORE_LOCK_TIME); + } + + /* + * Failing to set the 'fsize' limit is not a fatal error. We try to write + * lastlog anyway, under the risk of dying due to a SIGXFSZ. + */ + D(("setting limit for 'fsize'")); + + if ((announce & LASTLOG_UNLIMITED) == 0) { /* don't set to unlimited */ + setrlimit_res = -1; + } else if (getrlimit(RLIMIT_FSIZE, &old_limit) == 0) { + if (old_limit.rlim_cur == RLIM_INFINITY) { /* already unlimited */ + setrlimit_res = -1; + } else { + setrlimit_res = setrlimit(RLIMIT_FSIZE, &no_limit); + if (setrlimit_res != 0) + pam_syslog(pamh, LOG_WARNING, "Could not set limit for 'fsize': %m"); + } + } else { + setrlimit_res = -1; + if (errno == EINVAL) { + pam_syslog(pamh, LOG_INFO, "Limit for 'fsize' not supported: %m"); + } else { + pam_syslog(pamh, LOG_WARNING, "Could not get limit for 'fsize': %m"); + } + } + + D(("writing to the lastlog file")); + if (pam_modutil_write (last_fd, (char *) &last_login, + sizeof (last_login)) != sizeof(last_login)) { + pam_syslog(pamh, LOG_ERR, "failed to write %s: %m", _PATH_LASTLOG); + retval = PAM_SERVICE_ERR; + } + + /* + * Failing to restore the 'fsize' limit is a fatal error. + */ + D(("restoring limit for 'fsize'")); + if (setrlimit_res == 0) { + setrlimit_res = setrlimit(RLIMIT_FSIZE, &old_limit); + if (setrlimit_res != 0) { + pam_syslog(pamh, LOG_ERR, "Could not restore limit for 'fsize': %m"); + retval = PAM_SERVICE_ERR; + } + } + + last_lock.l_type = F_UNLCK; + (void) fcntl(last_fd, F_SETLK, &last_lock); /* unlock */ + D(("unlocked")); + + if (announce & LASTLOG_WTMP) { + /* write wtmp entry for user */ + logwtmp(last_login.ll_line, user, remote_host); + } + + /* cleanup */ + memset(&last_login, 0, sizeof(last_login)); + + return retval; +} + +static int +last_login_date(pam_handle_t *pamh, int announce, uid_t uid, const char *user, time_t *lltime) +{ + int retval; + int last_fd; + + if (uid > get_lastlog_uid_max(pamh)) { + return PAM_SUCCESS; + } + + /* obtain the last login date and all the relevant info */ + last_fd = last_login_open(pamh, announce, uid); + if (last_fd < 0) { + return PAM_SERVICE_ERR; + } + + retval = last_login_read(pamh, announce, last_fd, uid, lltime); + if (retval != PAM_SUCCESS) + { + close(last_fd); + D(("error while reading lastlog file")); + return retval; + } + + if (announce & LASTLOG_UPDATE) { + retval = last_login_write(pamh, announce, last_fd, uid, user); + } + + close(last_fd); + D(("all done with last login")); + + return retval; +} + +static int +last_login_failed(pam_handle_t *pamh, int announce, const char *user, time_t lltime) +{ + int retval; + int fd; + struct utmp ut; + struct utmp utuser; + int failed = 0; + char the_time[256]; + char *date = NULL; + char *host = NULL; + char *line = NULL; + + if (strlen(user) > UT_NAMESIZE) { + pam_syslog(pamh, LOG_WARNING, "username too long, output might be inaccurate"); + } + + /* obtain the failed login attempt records from btmp */ + fd = open(_PATH_BTMP, O_RDONLY); + if (fd < 0) { + int save_errno = errno; + pam_syslog(pamh, LOG_ERR, "unable to open %s: %m", _PATH_BTMP); + D(("unable to open %s file", _PATH_BTMP)); + if (save_errno == ENOENT) + return PAM_SUCCESS; + else + return PAM_SERVICE_ERR; + } + + while ((retval=pam_modutil_read(fd, (void *)&ut, + sizeof(ut))) == sizeof(ut)) { + if (ut.ut_tv.tv_sec >= lltime && strncmp(ut.ut_user, user, UT_NAMESIZE) == 0) { + memcpy(&utuser, &ut, sizeof(utuser)); + failed++; + } + } + + if (retval != 0) + pam_syslog(pamh, LOG_ERR, "corruption detected in %s", _PATH_BTMP); + retval = PAM_SUCCESS; + + if (failed) { + /* we want the date? */ + if (announce & LASTLOG_DATE) { + struct tm *tm, tm_buf; + time_t lf_time; + + lf_time = utuser.ut_tv.tv_sec; + tm = localtime_r (&lf_time, &tm_buf); + strftime (the_time, sizeof (the_time), + /* TRANSLATORS: "strftime options for date of last login" */ + _(" %a %b %e %H:%M:%S %Z %Y"), tm); + + date = the_time; + } + + /* we want & have the host? */ + if ((announce & LASTLOG_HOST) + && (utuser.ut_host[0] != '\0')) { + /* TRANSLATORS: " from " */ + if (asprintf(&host, _(" from %.*s"), UT_HOSTSIZE, + utuser.ut_host) < 0) { + pam_syslog(pamh, LOG_CRIT, "out of memory"); + retval = PAM_BUF_ERR; + goto cleanup; + } + } + + /* we want and have the terminal? */ + if ((announce & LASTLOG_LINE) + && (utuser.ut_line[0] != '\0')) { + /* TRANSLATORS: " on " */ + if (asprintf(&line, _(" on %.*s"), UT_LINESIZE, + utuser.ut_line) < 0) { + pam_syslog(pamh, LOG_CRIT, "out of memory"); + retval = PAM_BUF_ERR; + goto cleanup; + } + } + + if (line != NULL || date != NULL || host != NULL) { + /* TRANSLATORS: "Last failed login: from on " */ + pam_info(pamh, _("Last failed login:%s%s%s"), + date ? date : "", + host ? host : "", + line ? line : ""); + } + + _pam_drop(line); +#if defined HAVE_DNGETTEXT && defined ENABLE_NLS + retval = asprintf (&line, dngettext(PACKAGE, + "There was %d failed login attempt since the last successful login.", + "There were %d failed login attempts since the last successful login.", + failed), + failed); +#else + if (failed == 1) + retval = asprintf(&line, + _("There was %d failed login attempt since the last successful login."), + failed); + else + retval = asprintf(&line, + /* TRANSLATORS: only used if dngettext is not supported */ + _("There were %d failed login attempts since the last successful login."), + failed); +#endif + if (retval >= 0) + retval = pam_info(pamh, "%s", line); + else { + retval = PAM_BUF_ERR; + line = NULL; + } + } + +cleanup: + free(host); + free(line); + close(fd); + D(("all done with btmp")); + + return retval; +} + +/* --- authentication (locking out inactive users) functions --- */ +int +pam_sm_authenticate(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + int retval, ctrl; + const char *user = NULL; + const struct passwd *pwd; + uid_t uid; + time_t lltime = 0; + time_t inactive_days = 0; + int last_fd; + + /* + * Lock out the user if he did not login recently enough. + */ + + ctrl = _pam_auth_parse(pamh, flags, argc, argv, &inactive_days); + + /* which user? */ + + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS) { + pam_syslog(pamh, LOG_NOTICE, "cannot determine user name"); + return PAM_USER_UNKNOWN; + } + + /* what uid? */ + + pwd = pam_modutil_getpwnam (pamh, user); + if (pwd == NULL) { + pam_syslog(pamh, LOG_NOTICE, "user unknown"); + return PAM_USER_UNKNOWN; + } + uid = pwd->pw_uid; + pwd = NULL; /* tidy up */ + + if (uid == 0 || uid > get_lastlog_uid_max(pamh)) + return PAM_SUCCESS; + + /* obtain the last login date and all the relevant info */ + last_fd = last_login_open(pamh, ctrl, uid); + if (last_fd < 0) { + return PAM_IGNORE; + } + + retval = last_login_read(pamh, ctrl|LASTLOG_QUIET, last_fd, uid, &lltime); + close(last_fd); + + if (retval != PAM_SUCCESS) { + D(("error while reading lastlog file")); + return PAM_IGNORE; + } + + if (lltime == 0) { /* user never logged in before */ + if (ctrl & LASTLOG_DEBUG) + pam_syslog(pamh, LOG_DEBUG, "user never logged in - pass"); + return PAM_SUCCESS; + } + + lltime = (time(NULL) - lltime) / (24*60*60); + + if (lltime > inactive_days) { + pam_syslog(pamh, LOG_INFO, "user %s inactive for %ld days - denied", + user, (long) lltime); + return PAM_AUTH_ERR; + } + + return PAM_SUCCESS; +} + +int +pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +/* --- session management functions --- */ + +int +pam_sm_open_session(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + int retval, ctrl; + const void *user; + const struct passwd *pwd; + uid_t uid; + time_t lltime = 0; + + /* + * this module gets the uid of the PAM_USER. Uses it to display + * last login info and then updates the lastlog for that user. + */ + + ctrl = _pam_session_parse(pamh, flags, argc, argv); + + /* which user? */ + + retval = pam_get_item(pamh, PAM_USER, &user); + if (retval != PAM_SUCCESS || user == NULL || *(const char *)user == '\0') { + pam_syslog(pamh, LOG_NOTICE, "user unknown"); + return PAM_USER_UNKNOWN; + } + + /* what uid? */ + + pwd = pam_modutil_getpwnam (pamh, user); + if (pwd == NULL) { + D(("couldn't identify user %s", user)); + return PAM_USER_UNKNOWN; + } + uid = pwd->pw_uid; + pwd = NULL; /* tidy up */ + + /* process the current login attempt (indicate last) */ + + retval = last_login_date(pamh, ctrl, uid, user, &lltime); + + if ((ctrl & LASTLOG_BTMP) && retval == PAM_SUCCESS) { + retval = last_login_failed(pamh, ctrl, user, lltime); + } + + /* indicate success or failure */ + + uid = -1; /* forget this */ + + return retval; +} + +int +pam_sm_close_session (pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + const char *terminal_line; + + if (!(_pam_session_parse(pamh, flags, argc, argv) & LASTLOG_WTMP)) + return PAM_SUCCESS; + + terminal_line = get_tty(pamh); + + /* Wipe out utmp logout entry */ + logwtmp(terminal_line, "", ""); + + return PAM_SUCCESS; +} + +/* end of module definition */ diff --git a/modules/pam_lastlog/tst-pam_lastlog b/modules/pam_lastlog/tst-pam_lastlog new file mode 100755 index 0000000..ea9a5eb --- /dev/null +++ b/modules/pam_lastlog/tst-pam_lastlog @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_lastlog.so -- cgit v1.2.3