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_env/Makefile.am | 37 ++ modules/pam_env/Makefile.in | 1244 ++++++++++++++++++++++++++++++++++++ modules/pam_env/README | 96 +++ modules/pam_env/README.xml | 39 ++ modules/pam_env/environment | 5 + modules/pam_env/environment.5 | 1 + modules/pam_env/pam_env.8 | 158 +++++ modules/pam_env/pam_env.8.xml | 263 ++++++++ modules/pam_env/pam_env.c | 891 ++++++++++++++++++++++++++ modules/pam_env/pam_env.conf | 73 +++ modules/pam_env/pam_env.conf.5 | 132 ++++ modules/pam_env/pam_env.conf.5.xml | 136 ++++ modules/pam_env/tst-pam_env | 2 + 13 files changed, 3077 insertions(+) create mode 100644 modules/pam_env/Makefile.am create mode 100644 modules/pam_env/Makefile.in create mode 100644 modules/pam_env/README create mode 100644 modules/pam_env/README.xml create mode 100644 modules/pam_env/environment create mode 100644 modules/pam_env/environment.5 create mode 100644 modules/pam_env/pam_env.8 create mode 100644 modules/pam_env/pam_env.8.xml create mode 100644 modules/pam_env/pam_env.c create mode 100644 modules/pam_env/pam_env.conf create mode 100644 modules/pam_env/pam_env.conf.5 create mode 100644 modules/pam_env/pam_env.conf.5.xml create mode 100755 modules/pam_env/tst-pam_env (limited to 'modules/pam_env') diff --git a/modules/pam_env/Makefile.am b/modules/pam_env/Makefile.am new file mode 100644 index 0000000..c66112d --- /dev/null +++ b/modules/pam_env/Makefile.am @@ -0,0 +1,37 @@ +# +# Copyright (c) 2005, 2009 Thorsten Kukuk +# + +CLEANFILES = *~ +MAINTAINERCLEANFILES = $(MANS) README + +EXTRA_DIST = $(XMLS) + +if HAVE_DOC +dist_man_MANS = pam_env.conf.5 pam_env.8 environment.5 +endif +XMLS = README.xml pam_env.conf.5.xml pam_env.8.xml +dist_check_SCRIPTS = tst-pam_env +TESTS = $(dist_check_SCRIPTS) + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -DDEFAULT_CONF_FILE=\"$(SCONFIGDIR)/pam_env.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_env.la +pam_env_la_LIBADD = $(top_builddir)/libpam/libpam.la + +dist_secureconf_DATA = pam_env.conf +dist_sysconf_DATA = environment + +if ENABLE_REGENERATE_MAN +dist_noinst_DATA = README +environment.5: pam_env.conf.5.xml +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_env/Makefile.in b/modules/pam_env/Makefile.in new file mode 100644 index 0000000..b422c59 --- /dev/null +++ b/modules/pam_env/Makefile.in @@ -0,0 +1,1244 @@ +# Makefile.in generated by automake 1.16.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2018 Free Software Foundation, Inc. + +# This Makefile.in is free software; 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An alternate file can be specified with the conffile +option. + +Second a file (/etc/environment by default) with simple KEY=VAL pairs on +separate lines will be read. With the envfile option an alternate file can be +specified. And with the readenv option this can be completely disabled. + +Third it will read a user configuration file ($HOME/.pam_environment by +default). The default file can be changed with the user_envfile option and it +can be turned on and off with the user_readenv option. + +Since setting of PAM environment variables can have side effects to other +modules, this module should be the last one on the stack. + +OPTIONS + +conffile=/path/to/pam_env.conf + + Indicate an alternative pam_env.conf style configuration file to override + the default. This can be useful when different services need different + environments. + +debug + + A lot of debug information is printed with syslog(3). + +envfile=/path/to/environment + + Indicate an alternative environment file to override the default. The + syntax are simple KEY=VAL pairs on separate lines. The export instruction + can be specified for bash compatibility, but will be ignored. This can be + useful when different services need different environments. + +readenv=0|1 + + Turns on or off the reading of the file specified by envfile (0 is off, 1 + is on). By default this option is on. + +user_envfile=filename + + Indicate an alternative .pam_environment file to override the default.The + syntax is the same as for /etc/security/pam_env.conf. The filename is + relative to the user home directory. This can be useful when different + services need different environments. + +user_readenv=0|1 + + Turns on or off the reading of the user specific environment file. 0 is + off, 1 is on. By default this option is off. + +EXAMPLES + +These are some example lines which might be specified in /etc/security/ +pam_env.conf. + +Set the REMOTEHOST variable for any hosts that are remote, default to +"localhost" rather than not being set at all + + REMOTEHOST DEFAULT=localhost OVERRIDE=@{PAM_RHOST} + + +Set the DISPLAY variable if it seems reasonable + + DISPLAY DEFAULT=${REMOTEHOST}:0.0 OVERRIDE=${DISPLAY} + + +Now some simple variables + + PAGER DEFAULT=less + MANPAGER DEFAULT=less + LESS DEFAULT="M q e h15 z23 b80" + NNTPSERVER DEFAULT=localhost + PATH DEFAULT=${HOME}/bin:/usr/local/bin:/bin\ + :/usr/bin:/usr/local/bin/X11:/usr/bin/X11 + XDG_DATA_HOME @{HOME}/share/ + + +Silly examples of escaped variables, just to show how they work. + + DOLLAR DEFAULT=\$ + DOLLARDOLLAR DEFAULT= OVERRIDE=\$${DOLLAR} + DOLLARPLUS DEFAULT=\${REMOTEHOST}${REMOTEHOST} + ATSIGN DEFAULT="" OVERRIDE=\@ + + diff --git a/modules/pam_env/README.xml b/modules/pam_env/README.xml new file mode 100644 index 0000000..21a9b85 --- /dev/null +++ b/modules/pam_env/README.xml @@ -0,0 +1,39 @@ + + +--> + +]> + +
+ + + + + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_env.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_env-name"]/*)'/> + + + + +
+ +
+ +
+ +
+ +
+ +
+ +
diff --git a/modules/pam_env/environment b/modules/pam_env/environment new file mode 100644 index 0000000..3e704a6 --- /dev/null +++ b/modules/pam_env/environment @@ -0,0 +1,5 @@ +# +# This file is parsed by pam_env module +# +# Syntax: simple "KEY=VAL" pairs on separate lines +# diff --git a/modules/pam_env/environment.5 b/modules/pam_env/environment.5 new file mode 100644 index 0000000..aa670e2 --- /dev/null +++ b/modules/pam_env/environment.5 @@ -0,0 +1 @@ +.so man5/pam_env.conf.5 diff --git a/modules/pam_env/pam_env.8 b/modules/pam_env/pam_env.8 new file mode 100644 index 0000000..f674024 --- /dev/null +++ b/modules/pam_env/pam_env.8 @@ -0,0 +1,158 @@ +'\" t +.\" Title: pam_env +.\" 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_ENV" "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_env \- PAM module to set/unset environment variables +.SH "SYNOPSIS" +.HP \w'\fBpam_env\&.so\fR\ 'u +\fBpam_env\&.so\fR [debug] [conffile=\fIconf\-file\fR] [envfile=\fIenv\-file\fR] [readenv=\fI0|1\fR] [user_envfile=\fIenv\-file\fR] [user_readenv=\fI0|1\fR] +.SH "DESCRIPTION" +.PP +The pam_env PAM module allows the (un)setting of environment variables\&. Supported is the use of previously set environment variables as well as +\fIPAM_ITEM\fRs such as +\fIPAM_RHOST\fR\&. +.PP +By default rules for (un)setting of variables are taken from the config file +/etc/security/pam_env\&.conf\&. An alternate file can be specified with the +\fIconffile\fR +option\&. +.PP +Second a file (/etc/environment +by default) with simple +\fIKEY=VAL\fR +pairs on separate lines will be read\&. With the +\fIenvfile\fR +option an alternate file can be specified\&. And with the +\fIreadenv\fR +option this can be completely disabled\&. +.PP +Third it will read a user configuration file ($HOME/\&.pam_environment +by default)\&. The default file can be changed with the +\fIuser_envfile\fR +option and it can be turned on and off with the +\fIuser_readenv\fR +option\&. +.PP +Since setting of PAM environment variables can have side effects to other modules, this module should be the last one on the stack\&. +.SH "OPTIONS" +.PP +\fBconffile=\fR\fB\fI/path/to/pam_env\&.conf\fR\fR +.RS 4 +Indicate an alternative +pam_env\&.conf +style configuration file to override the default\&. This can be useful when different services need different environments\&. +.RE +.PP +\fBdebug\fR +.RS 4 +A lot of debug information is printed with +\fBsyslog\fR(3)\&. +.RE +.PP +\fBenvfile=\fR\fB\fI/path/to/environment\fR\fR +.RS 4 +Indicate an alternative +environment +file to override the default\&. The syntax are simple +\fIKEY=VAL\fR +pairs on separate lines\&. The +\fIexport\fR +instruction can be specified for bash compatibility, but will be ignored\&. This can be useful when different services need different environments\&. +.RE +.PP +\fBreadenv=\fR\fB\fI0|1\fR\fR +.RS 4 +Turns on or off the reading of the file specified by envfile (0 is off, 1 is on)\&. By default this option is on\&. +.RE +.PP +\fBuser_envfile=\fR\fB\fIfilename\fR\fR +.RS 4 +Indicate an alternative +\&.pam_environment +file to override the default\&.The syntax is the same as for +\fI/etc/security/pam_env\&.conf\fR\&. The filename is relative to the user home directory\&. This can be useful when different services need different environments\&. +.RE +.PP +\fBuser_readenv=\fR\fB\fI0|1\fR\fR +.RS 4 +Turns on or off the reading of the user specific environment file\&. 0 is off, 1 is on\&. By default this option is off\&. +.RE +.SH "MODULE TYPES PROVIDED" +.PP +The +\fBauth\fR +and +\fBsession\fR +module types are provided\&. +.SH "RETURN VALUES" +.PP +PAM_ABORT +.RS 4 +Not all relevant data or options could be gotten\&. +.RE +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\&. +.RE +.PP +PAM_IGNORE +.RS 4 +No pam_env\&.conf and environment file was found\&. +.RE +.PP +PAM_SUCCESS +.RS 4 +Environment variables were set\&. +.RE +.SH "FILES" +.PP +/etc/security/pam_env\&.conf +.RS 4 +Default configuration file +.RE +.PP +/etc/environment +.RS 4 +Default environment file +.RE +.PP +$HOME/\&.pam_environment +.RS 4 +User specific environment file +.RE +.SH "SEE ALSO" +.PP +\fBpam_env.conf\fR(5), +\fBpam.d\fR(5), +\fBpam\fR(8), +\fBenviron\fR(7)\&. +.SH "AUTHOR" +.PP +pam_env was written by Dave Kinchlea \&. diff --git a/modules/pam_env/pam_env.8.xml b/modules/pam_env/pam_env.8.xml new file mode 100644 index 0000000..b765e52 --- /dev/null +++ b/modules/pam_env/pam_env.8.xml @@ -0,0 +1,263 @@ + + + + + + + pam_env + 8 + Linux-PAM Manual + + + + pam_env + + PAM module to set/unset environment variables + + + + + + + + pam_env.so + + debug + + + conffile=conf-file + + + envfile=env-file + + + readenv=0|1 + + + user_envfile=env-file + + + user_readenv=0|1 + + + + + + + DESCRIPTION + + The pam_env PAM module allows the (un)setting of environment + variables. Supported is the use of previously set environment + variables as well as PAM_ITEMs such as + PAM_RHOST. + + + By default rules for (un)setting of variables are taken from the + config file /etc/security/pam_env.conf. An + alternate file can be specified with the conffile + option. + + + Second a file (/etc/environment by default) with simple + KEY=VAL pairs on separate lines will be read. + With the envfile option an alternate file can be specified. + And with the readenv option this can be completely disabled. + + + Third it will read a user configuration file + ($HOME/.pam_environment by default). + The default file can be changed with the + user_envfile option + and it can be turned on and off with the user_readenv option. + + + Since setting of PAM environment variables can have side effects + to other modules, this module should be the last one on the stack. + + + + + OPTIONS + + + + + + + + + Indicate an alternative pam_env.conf + style configuration file to override the default. This can + be useful when different services need different environments. + + + + + + + + + + + A lot of debug information is printed with + syslog3. + + + + + + + + + + + Indicate an alternative environment + file to override the default. The syntax are simple + KEY=VAL pairs on separate lines. The + export instruction can be specified for bash + compatibility, but will be ignored. + This can be useful when different services need different environments. + + + + + + + + + + + Turns on or off the reading of the file specified by envfile + (0 is off, 1 is on). By default this option is on. + + + + + + + + + + + + Indicate an alternative .pam_environment + file to override the default.The syntax is the same as + for /etc/security/pam_env.conf. + The filename is relative to the user home directory. + This can be useful when different services need different + environments. + + + + + + + + + + + Turns on or off the reading of the user specific environment + file. 0 is off, 1 is on. By default this option is off. + + + + + + + + + MODULE TYPES PROVIDED + + The and module + types are provided. + + + + + RETURN VALUES + + + PAM_ABORT + + + Not all relevant data or options could be gotten. + + + + + PAM_BUF_ERR + + + Memory buffer error. + + + + + PAM_IGNORE + + + No pam_env.conf and environment file was found. + + + + + PAM_SUCCESS + + + Environment variables were set. + + + + + + + + FILES + + + /etc/security/pam_env.conf + + Default configuration file + + + + /etc/environment + + Default environment file + + + + $HOME/.pam_environment + + User specific environment file + + + + + + + SEE ALSO + + + pam_env.conf5 + , + + pam.d5 + , + + pam8 + , + + environ7 + . + + + + + AUTHOR + + pam_env was written by Dave Kinchlea <kinch@kinch.ark.com>. + + + diff --git a/modules/pam_env/pam_env.c b/modules/pam_env/pam_env.c new file mode 100644 index 0000000..79d4372 --- /dev/null +++ b/modules/pam_env/pam_env.c @@ -0,0 +1,891 @@ +/* + * pam_env module + * + * Written by Dave Kinchlea 1997/01/31 + * Inspired by Andrew Morgan , who also supplied the + * template for this file (via pam_mail) + */ + +#define DEFAULT_ETC_ENVFILE "/etc/environment" +#define DEFAULT_READ_ENVFILE 1 + +#define DEFAULT_USER_ENVFILE ".pam_environment" +#define DEFAULT_USER_READ_ENVFILE 0 + +#include "config.h" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include "pam_inline.h" + +/* This little structure makes it easier to keep variables together */ + +typedef struct var { + char *name; + char *value; + char *defval; + char *override; +} VAR; + +#define BUF_SIZE 8192 +#define MAX_ENV 8192 + +#define GOOD_LINE 0 +#define BAD_LINE 100 /* This must be > the largest PAM_* error code */ + +#define DEFINE_VAR 101 +#define UNDEFINE_VAR 102 +#define ILLEGAL_VAR 103 + +static int _assemble_line(FILE *, char *, int); +static int _parse_line(const pam_handle_t *, const char *, VAR *); +static int _check_var(pam_handle_t *, VAR *); /* This is the real meat */ +static void _clean_var(VAR *); +static int _expand_arg(pam_handle_t *, char **); +static const char * _pam_get_item_byname(pam_handle_t *, const char *); +static int _define_var(pam_handle_t *, int, VAR *); +static int _undefine_var(pam_handle_t *, int, VAR *); + +/* This is a special value used to designate an empty string */ +static char quote='\0'; + +/* argument parsing */ + +#define PAM_DEBUG_ARG 0x01 + +static int +_pam_parse (const pam_handle_t *pamh, int argc, const char **argv, + const char **conffile, const char **envfile, int *readenv, + const char **user_envfile, int *user_readenv) +{ + int ctrl=0; + + *user_envfile = DEFAULT_USER_ENVFILE; + *envfile = DEFAULT_ETC_ENVFILE; + *readenv = DEFAULT_READ_ENVFILE; + *user_readenv = DEFAULT_USER_READ_ENVFILE; + *conffile = DEFAULT_CONF_FILE; + + /* step through arguments */ + for (; argc-- > 0; ++argv) { + const char *str; + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else if ((str = pam_str_skip_prefix(*argv, "conffile=")) != NULL) { + if (str[0] == '\0') { + pam_syslog(pamh, LOG_ERR, + "conffile= specification missing argument - ignored"); + } else { + *conffile = str; + D(("new Configuration File: %s", *conffile)); + } + } else if ((str = pam_str_skip_prefix(*argv, "envfile=")) != NULL) { + if (str[0] == '\0') { + pam_syslog (pamh, LOG_ERR, + "envfile= specification missing argument - ignored"); + } else { + *envfile = str; + D(("new Env File: %s", *envfile)); + } + } else if ((str = pam_str_skip_prefix(*argv, "user_envfile=")) != NULL) { + if (str[0] == '\0') { + pam_syslog (pamh, LOG_ERR, + "user_envfile= specification missing argument - ignored"); + } else { + *user_envfile = str; + D(("new User Env File: %s", *user_envfile)); + } + } else if ((str = pam_str_skip_prefix(*argv, "readenv=")) != NULL) { + *readenv = atoi(str); + } else if ((str = pam_str_skip_prefix(*argv, "user_readenv=")) != NULL) { + *user_readenv = atoi(str); + } else + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + + return ctrl; +} + +static int +_parse_config_file(pam_handle_t *pamh, int ctrl, const char *file) +{ + int retval; + char buffer[BUF_SIZE]; + FILE *conf; + VAR Var, *var=&Var; + + D(("Called.")); + + var->name=NULL; var->defval=NULL; var->override=NULL; + + D(("Config file name is: %s", file)); + + /* + * Lets try to open the config file, parse it and process + * any variables found. + */ + + if ((conf = fopen(file,"r")) == NULL) { + pam_syslog(pamh, LOG_ERR, "Unable to open config file: %s: %m", file); + return PAM_IGNORE; + } + + /* _pam_assemble_line will provide a complete line from the config file, + * with all comments removed and any escaped newlines fixed up + */ + + while (( retval = _assemble_line(conf, buffer, BUF_SIZE)) > 0) { + D(("Read line: %s", buffer)); + + if ((retval = _parse_line(pamh, buffer, var)) == GOOD_LINE) { + retval = _check_var(pamh, var); + + if (DEFINE_VAR == retval) { + retval = _define_var(pamh, ctrl, var); + + } else if (UNDEFINE_VAR == retval) { + retval = _undefine_var(pamh, ctrl, var); + } + } + if (PAM_SUCCESS != retval && ILLEGAL_VAR != retval + && BAD_LINE != retval && PAM_BAD_ITEM != retval) break; + + _clean_var(var); + + } /* while */ + + (void) fclose(conf); + + /* tidy up */ + _clean_var(var); /* We could have got here prematurely, + * this is safe though */ + D(("Exit.")); + return (retval != 0 ? PAM_ABORT : PAM_SUCCESS); +} + +static int +_parse_env_file(pam_handle_t *pamh, int ctrl, const char *file) +{ + int retval=PAM_SUCCESS, i, t; + char buffer[BUF_SIZE], *key, *mark; + FILE *conf; + + D(("Env file name is: %s", file)); + + if ((conf = fopen(file,"r")) == NULL) { + pam_syslog(pamh, LOG_ERR, "Unable to open env file: %s: %m", file); + return PAM_IGNORE; + } + + while (_assemble_line(conf, buffer, BUF_SIZE) > 0) { + D(("Read line: %s", buffer)); + key = buffer; + + /* skip leading white space */ + key += strspn(key, " \n\t"); + + /* skip blanks lines and comments */ + if (key[0] == '#') + continue; + + /* skip over "export " if present so we can be compat with + bash type declarations */ + if (strncmp(key, "export ", (size_t) 7) == 0) + key += 7; + + /* now find the end of value */ + mark = key; + while(mark[0] != '\n' && mark[0] != '#' && mark[0] != '\0') + mark++; + if (mark[0] != '\0') + mark[0] = '\0'; + + /* + * sanity check, the key must be alphanumeric + */ + + if (key[0] == '=') { + pam_syslog(pamh, LOG_ERR, + "missing key name '%s' in %s', ignoring", + key, file); + continue; + } + + for ( i = 0 ; key[i] != '=' && key[i] != '\0' ; i++ ) + if (!isalnum(key[i]) && key[i] != '_') { + pam_syslog(pamh, LOG_ERR, + "non-alphanumeric key '%s' in %s', ignoring", + key, file); + break; + } + /* non-alphanumeric key, ignore this line */ + if (key[i] != '=' && key[i] != '\0') + continue; + + /* now we try to be smart about quotes around the value, + but not too smart, we can't get all fancy with escaped + values like bash */ + if (key[i] == '=' && (key[++i] == '\"' || key[i] == '\'')) { + for ( t = i+1 ; key[t] != '\0' ; t++) + if (key[t] != '\"' && key[t] != '\'') + key[i++] = key[t]; + else if (key[t+1] != '\0') + key[i++] = key[t]; + key[i] = '\0'; + } + + /* if this is a request to delete a variable, check that it's + actually set first, so we don't get a vague error back from + pam_putenv() */ + for (i = 0; key[i] != '=' && key[i] != '\0'; i++); + + if (key[i] == '\0' && !pam_getenv(pamh,key)) + continue; + + /* set the env var, if it fails, we break out of the loop */ + retval = pam_putenv(pamh, key); + if (retval != PAM_SUCCESS) { + D(("error setting env \"%s\"", key)); + break; + } else if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, + "pam_putenv(\"%s\")", key); + } + } + + (void) fclose(conf); + + /* tidy up */ + D(("Exit.")); + return retval; +} + +/* + * This is where we read a line of the PAM config file. The line may be + * preceded by lines of comments and also extended with "\\\n" + */ + +static int _assemble_line(FILE *f, char *buffer, int buf_len) +{ + char *p = buffer; + char *s, *os; + int used = 0; + int whitespace; + + /* loop broken with a 'break' when a non-'\\n' ended line is read */ + + D(("called.")); + for (;;) { + if (used >= buf_len) { + /* Overflow */ + D(("_assemble_line: overflow")); + return -1; + } + if (fgets(p, buf_len - used, f) == NULL) { + if (used) { + /* Incomplete read */ + return -1; + } else { + /* EOF */ + return 0; + } + } + if (p[0] == '\0') { + D(("_assemble_line: corrupted or binary file")); + return -1; + } + if (p[strlen(p)-1] != '\n') { + D(("_assemble_line: line too long")); + return -1; + } + + /* skip leading spaces --- line may be blank */ + + whitespace = strspn(p, " \n\t"); + s = p + whitespace; + if (*s && (*s != '#')) { + used += whitespace; + os = s; + + /* + * we are only interested in characters before the first '#' + * character + */ + + while (*s && *s != '#') + ++s; + if (*s == '#') { + *s = '\0'; + used += strlen(os); + break; /* the line has been read */ + } + + s = os; + + /* + * Check for backslash by scanning back from the end of + * the entered line, the '\n' has been included since + * normally a line is terminated with this + * character. fgets() should only return one though! + */ + + s += strlen(s); + while (s > os && ((*--s == ' ') || (*s == '\t') + || (*s == '\n'))); + + /* check if it ends with a backslash */ + if (*s == '\\') { + *s = '\0'; /* truncate the line here */ + used += strlen(os); + p = s; /* there is more ... */ + } else { + /* End of the line! */ + used += strlen(os); + break; /* this is the complete line */ + } + + } else { + /* Nothing in this line */ + /* Don't move p */ + } + } + + return used; +} + +static int +_parse_line (const pam_handle_t *pamh, const char *buffer, VAR *var) +{ + /* + * parse buffer into var, legal syntax is + * VARIABLE [DEFAULT=[[string]] [OVERRIDE=[value]] + * + * Any other options defined make this a bad line, + * error logged and no var set + */ + + int length, quoteflg=0; + const char *ptr, *tmpptr; + char **valptr; + + D(("Called buffer = <%s>", buffer)); + + length = strcspn(buffer," \t\n"); + + if ((var->name = malloc(length + 1)) == NULL) { + pam_syslog(pamh, LOG_CRIT, "Couldn't malloc %d bytes", length+1); + return PAM_BUF_ERR; + } + + /* + * The first thing on the line HAS to be the variable name, + * it may be the only thing though. + */ + strncpy(var->name, buffer, length); + var->name[length] = '\0'; + D(("var->name = <%s>, length = %d", var->name, length)); + + /* + * Now we check for arguments, we only support two kinds and ('cause I am lazy) + * each one can actually be listed any number of times + */ + + ptr = buffer+length; + while ((length = strspn(ptr, " \t")) > 0) { + ptr += length; /* remove leading whitespace */ + D((ptr)); + if ((tmpptr = pam_str_skip_prefix(ptr, "DEFAULT=")) != NULL) { + ptr = tmpptr; + D(("Default arg found: <%s>", ptr)); + valptr=&(var->defval); + } else if ((tmpptr = pam_str_skip_prefix(ptr, "OVERRIDE=")) != NULL) { + ptr = tmpptr; + D(("Override arg found: <%s>", ptr)); + valptr=&(var->override); + } else { + D(("Unrecognized options: <%s> - ignoring line", ptr)); + pam_syslog(pamh, LOG_ERR, "Unrecognized Option: %s - ignoring line", ptr); + return BAD_LINE; + } + + if ('"' != *ptr) { /* Escaped quotes not supported */ + length = strcspn(ptr, " \t\n"); + tmpptr = ptr+length; + } else { + tmpptr = strchr(++ptr, '"'); + if (!tmpptr) { + D(("Unterminated quoted string: %s", ptr-1)); + pam_syslog(pamh, LOG_ERR, "Unterminated quoted string: %s", ptr-1); + return BAD_LINE; + } + length = tmpptr - ptr; + if (*++tmpptr && ' ' != *tmpptr && '\t' != *tmpptr && '\n' != *tmpptr) { + D(("Quotes must cover the entire string: <%s>", ptr)); + pam_syslog(pamh, LOG_ERR, "Quotes must cover the entire string: <%s>", ptr); + return BAD_LINE; + } + quoteflg++; + } + if (length) { + if ((*valptr = malloc(length + 1)) == NULL) { + D(("Couldn't malloc %d bytes", length+1)); + pam_syslog(pamh, LOG_CRIT, "Couldn't malloc %d bytes", length+1); + return PAM_BUF_ERR; + } + (void)strncpy(*valptr,ptr,length); + (*valptr)[length]='\0'; + } else if (quoteflg--) { + *valptr = "e; /* a quick hack to handle the empty string */ + } + ptr = tmpptr; /* Start the search where we stopped */ + } /* while */ + + /* + * The line is parsed, all is well. + */ + + D(("Exit.")); + ptr = NULL; tmpptr = NULL; valptr = NULL; + return GOOD_LINE; +} + +static int _check_var(pam_handle_t *pamh, VAR *var) +{ + /* + * Examine the variable and determine what action to take. + * Returns DEFINE_VAR, UNDEFINE_VAR depending on action to take + * or a PAM_* error code if passed back from other routines + * + * if no DEFAULT provided, the empty string is assumed + * if no OVERRIDE provided, the empty string is assumed + * if DEFAULT= and OVERRIDE evaluates to the empty string, + * this variable should be undefined + * if DEFAULT="" and OVERRIDE evaluates to the empty string, + * this variable should be defined with no value + * if OVERRIDE=value and value turns into the empty string, DEFAULT is used + * + * If DEFINE_VAR is to be returned, the correct value to define will + * be pointed to by var->value + */ + + int retval; + + D(("Called.")); + + /* + * First thing to do is to expand any arguments, but only + * if they are not the special quote values (cause expand_arg + * changes memory). + */ + + if (var->defval && ("e != var->defval) && + ((retval = _expand_arg(pamh, &(var->defval))) != PAM_SUCCESS)) { + return retval; + } + if (var->override && ("e != var->override) && + ((retval = _expand_arg(pamh, &(var->override))) != PAM_SUCCESS)) { + return retval; + } + + /* Now its easy */ + + if (var->override && *(var->override)) { + /* if there is a non-empty string in var->override, we use it */ + D(("OVERRIDE variable <%s> being used: <%s>", var->name, var->override)); + var->value = var->override; + retval = DEFINE_VAR; + } else { + + var->value = var->defval; + if ("e == var->defval) { + /* + * This means that the empty string was given for defval value + * which indicates that a variable should be defined with no value + */ + D(("An empty variable: <%s>", var->name)); + retval = DEFINE_VAR; + } else if (var->defval) { + D(("DEFAULT variable <%s> being used: <%s>", var->name, var->defval)); + retval = DEFINE_VAR; + } else { + D(("UNDEFINE variable <%s>", var->name)); + retval = UNDEFINE_VAR; + } + } + + D(("Exit.")); + return retval; +} + +static int _expand_arg(pam_handle_t *pamh, char **value) +{ + const char *orig=*value, *tmpptr=NULL; + char *ptr; /* + * Sure would be nice to use tmpptr but it needs to be + * a constant so that the compiler will shut up when I + * call pam_getenv and _pam_get_item_byname -- sigh + */ + + /* No unexpanded variable can be bigger than BUF_SIZE */ + char type, tmpval[BUF_SIZE]; + + /* I know this shouldn't be hard-coded but it's so much easier this way */ + char tmp[MAX_ENV]; + size_t idx; + + D(("Remember to initialize tmp!")); + memset(tmp, 0, MAX_ENV); + idx = 0; + + /* + * (possibly non-existent) environment variables can be used as values + * by prepending a "$" and wrapping in {} (ie: ${HOST}), can escape with "\" + * (possibly non-existent) PAM items can be used as values + * by prepending a "@" and wrapping in {} (ie: @{PAM_RHOST}, can escape + * + */ + D(("Expanding <%s>",orig)); + while (*orig) { /* while there is some input to deal with */ + if ('\\' == *orig) { + ++orig; + if ('$' != *orig && '@' != *orig) { + D(("Unrecognized escaped character: <%c> - ignoring", *orig)); + pam_syslog(pamh, LOG_ERR, + "Unrecognized escaped character: <%c> - ignoring", + *orig); + } else if (idx + 1 < MAX_ENV) { + tmp[idx++] = *orig++; /* Note the increment */ + } else { + /* is it really a good idea to try to log this? */ + D(("Variable buffer overflow: <%s> + <%s>", tmp, tmpptr)); + pam_syslog (pamh, LOG_ERR, "Variable buffer overflow: <%s> + <%s>", + tmp, tmpptr); + return PAM_BUF_ERR; + } + continue; + } + if ('$' == *orig || '@' == *orig) { + if ('{' != *(orig+1)) { + D(("Expandable variables must be wrapped in {}" + " <%s> - ignoring", orig)); + pam_syslog(pamh, LOG_ERR, "Expandable variables must be wrapped in {}" + " <%s> - ignoring", orig); + if (idx + 1 < MAX_ENV) { + tmp[idx++] = *orig++; /* Note the increment */ + } + continue; + } else { + D(("Expandable argument: <%s>", orig)); + type = *orig; + orig+=2; /* skip the ${ or @{ characters */ + ptr = strchr(orig, '}'); + if (ptr) { + *ptr++ = '\0'; + } else { + D(("Unterminated expandable variable: <%s>", orig-2)); + pam_syslog(pamh, LOG_ERR, + "Unterminated expandable variable: <%s>", orig-2); + return PAM_ABORT; + } + strncpy(tmpval, orig, sizeof(tmpval)); + tmpval[sizeof(tmpval)-1] = '\0'; + orig=ptr; + /* + * so, we know we need to expand tmpval, it is either + * an environment variable or a PAM_ITEM. type will tell us which + */ + switch (type) { + + case '$': + D(("Expanding env var: <%s>",tmpval)); + tmpptr = pam_getenv(pamh, tmpval); + D(("Expanded to <%s>", tmpptr)); + break; + + case '@': + D(("Expanding pam item: <%s>",tmpval)); + tmpptr = _pam_get_item_byname(pamh, tmpval); + D(("Expanded to <%s>", tmpptr)); + break; + + default: + D(("Impossible error, type == <%c>", type)); + pam_syslog(pamh, LOG_CRIT, "Impossible error, type == <%c>", type); + return PAM_ABORT; + } /* switch */ + + if (tmpptr) { + size_t len = strlen(tmpptr); + if (idx + len < MAX_ENV) { + strcpy(tmp + idx, tmpptr); + idx += len; + } else { + /* is it really a good idea to try to log this? */ + D(("Variable buffer overflow: <%s> + <%s>", tmp, tmpptr)); + pam_syslog (pamh, LOG_ERR, + "Variable buffer overflow: <%s> + <%s>", tmp, tmpptr); + return PAM_BUF_ERR; + } + } + } /* if ('{' != *orig++) */ + } else { /* if ( '$' == *orig || '@' == *orig) */ + if (idx + 1 < MAX_ENV) { + tmp[idx++] = *orig++; /* Note the increment */ + } else { + /* is it really a good idea to try to log this? */ + D(("Variable buffer overflow: <%s> + <%s>", tmp, tmpptr)); + pam_syslog(pamh, LOG_ERR, + "Variable buffer overflow: <%s> + <%s>", tmp, tmpptr); + return PAM_BUF_ERR; + } + } + } /* for (;*orig;) */ + + if (idx > strlen(*value)) { + free(*value); + if ((*value = malloc(idx + 1)) == NULL) { + D(("Couldn't malloc %d bytes for expanded var", idx + 1)); + pam_syslog (pamh, LOG_CRIT, "Couldn't malloc %lu bytes for expanded var", + (unsigned long)idx+1); + return PAM_BUF_ERR; + } + } + strcpy(*value, tmp); + memset(tmp, '\0', sizeof(tmp)); + D(("Exit.")); + + return PAM_SUCCESS; +} + +static const char * _pam_get_item_byname(pam_handle_t *pamh, const char *name) +{ + /* + * This function just allows me to use names as given in the config + * file and translate them into the appropriate PAM_ITEM macro + */ + + int item; + const void *itemval; + + D(("Called.")); + if (strcmp(name, "PAM_USER") == 0 || strcmp(name, "HOME") == 0 || strcmp(name, "SHELL") == 0) { + item = PAM_USER; + } else if (strcmp(name, "PAM_USER_PROMPT") == 0) { + item = PAM_USER_PROMPT; + } else if (strcmp(name, "PAM_TTY") == 0) { + item = PAM_TTY; + } else if (strcmp(name, "PAM_RUSER") == 0) { + item = PAM_RUSER; + } else if (strcmp(name, "PAM_RHOST") == 0) { + item = PAM_RHOST; + } else { + D(("Unknown PAM_ITEM: <%s>", name)); + pam_syslog (pamh, LOG_ERR, "Unknown PAM_ITEM: <%s>", name); + return NULL; + } + + if (pam_get_item(pamh, item, &itemval) != PAM_SUCCESS) { + D(("pam_get_item failed")); + return NULL; /* let pam_get_item() log the error */ + } + + if (itemval && (strcmp(name, "HOME") == 0 || strcmp(name, "SHELL") == 0)) { + struct passwd *user_entry; + user_entry = pam_modutil_getpwnam (pamh, itemval); + if (!user_entry) { + pam_syslog(pamh, LOG_ERR, "No such user!?"); + return NULL; + } + return (strcmp(name, "SHELL") == 0) ? + user_entry->pw_shell : + user_entry->pw_dir; + } + + D(("Exit.")); + return itemval; +} + +static int _define_var(pam_handle_t *pamh, int ctrl, VAR *var) +{ + /* We have a variable to define, this is a simple function */ + + char *envvar; + int retval = PAM_SUCCESS; + + D(("Called.")); + if (asprintf(&envvar, "%s=%s", var->name, var->value) < 0) { + pam_syslog(pamh, LOG_CRIT, "out of memory"); + return PAM_BUF_ERR; + } + + retval = pam_putenv(pamh, envvar); + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, "pam_putenv(\"%s\")", envvar); + } + _pam_drop(envvar); + D(("Exit.")); + return retval; +} + +static int _undefine_var(pam_handle_t *pamh, int ctrl, VAR *var) +{ + /* We have a variable to undefine, this is a simple function */ + + D(("Called and exit.")); + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, "remove variable \"%s\"", var->name); + } + return pam_putenv(pamh, var->name); +} + +static void _clean_var(VAR *var) +{ + if (var->name) { + free(var->name); + } + if (var->defval && ("e != var->defval)) { + free(var->defval); + } + if (var->override && ("e != var->override)) { + free(var->override); + } + var->name = NULL; + var->value = NULL; /* never has memory specific to it */ + var->defval = NULL; + var->override = NULL; + return; +} + + + +/* --- authentication management functions (only) --- */ + +int +pam_sm_authenticate (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +static int +handle_env (pam_handle_t *pamh, int argc, const char **argv) +{ + int retval, ctrl, readenv=DEFAULT_READ_ENVFILE; + int user_readenv = DEFAULT_USER_READ_ENVFILE; + const char *conf_file = NULL, *env_file = NULL, *user_env_file = NULL; + + /* + * this module sets environment variables read in from a file + */ + + D(("Called.")); + ctrl = _pam_parse(pamh, argc, argv, &conf_file, &env_file, + &readenv, &user_env_file, &user_readenv); + + retval = _parse_config_file(pamh, ctrl, conf_file); + + if(readenv && retval == PAM_SUCCESS) { + retval = _parse_env_file(pamh, ctrl, env_file); + if (retval == PAM_IGNORE) + retval = PAM_SUCCESS; + } + + if(user_readenv && retval == PAM_SUCCESS) { + char *envpath = NULL; + struct passwd *user_entry = NULL; + const char *username; + struct stat statbuf; + + username = _pam_get_item_byname(pamh, "PAM_USER"); + + if (username) + user_entry = pam_modutil_getpwnam (pamh, username); + if (!user_entry) { + pam_syslog(pamh, LOG_ERR, "No such user!?"); + } + else { + if (asprintf(&envpath, "%s/%s", user_entry->pw_dir, user_env_file) < 0) + { + pam_syslog(pamh, LOG_CRIT, "Out of memory"); + return PAM_BUF_ERR; + } + if (stat(envpath, &statbuf) == 0) { + PAM_MODUTIL_DEF_PRIVS(privs); + + if (pam_modutil_drop_priv(pamh, &privs, user_entry)) { + retval = PAM_SESSION_ERR; + } else { + retval = _parse_config_file(pamh, ctrl, envpath); + if (pam_modutil_regain_priv(pamh, &privs)) + retval = PAM_SESSION_ERR; + } + if (retval == PAM_IGNORE) + retval = PAM_SUCCESS; + } + free(envpath); + } + } + + /* indicate success or failure */ + D(("Exit.")); + return retval; +} + +int +pam_sm_acct_mgmt (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + pam_syslog (pamh, LOG_NOTICE, "pam_sm_acct_mgmt called inappropriately"); + return PAM_SERVICE_ERR; +} + +int +pam_sm_setcred (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + D(("Called")); + return handle_env (pamh, argc, argv); +} + +int +pam_sm_open_session (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + D(("Called")); + return handle_env (pamh, argc, argv); +} + +int +pam_sm_close_session (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + D(("Called and Exit")); + return PAM_SUCCESS; +} + +int +pam_sm_chauthtok (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + pam_syslog (pamh, LOG_NOTICE, "pam_sm_chauthtok called inappropriately"); + return PAM_SERVICE_ERR; +} + +/* end of module definition */ diff --git a/modules/pam_env/pam_env.conf b/modules/pam_env/pam_env.conf new file mode 100644 index 0000000..2549e43 --- /dev/null +++ b/modules/pam_env/pam_env.conf @@ -0,0 +1,73 @@ +# +# This is the configuration file for pam_env, a PAM module to load in +# a configurable list of environment variables for a +# +# The original idea for this came from Andrew G. Morgan ... +# +# Mmm. Perhaps you might like to write a pam_env module that reads a +# default environment from a file? I can see that as REALLY +# useful... Note it would be an "auth" module that returns PAM_IGNORE +# for the auth part and sets the environment returning PAM_SUCCESS in +# the setcred function... +# +# +# What I wanted was the REMOTEHOST variable set, purely for selfish +# reasons, and AGM didn't want it added to the SimpleApps login +# program (which is where I added the patch). So, my first concern is +# that variable, from there there are numerous others that might/would +# be useful to be set: NNTPSERVER, LESS, PATH, PAGER, MANPAGER ..... +# +# Of course, these are a different kind of variable than REMOTEHOST in +# that they are things that are likely to be configured by +# administrators rather than set by logging in, how to treat them both +# in the same config file? +# +# Here is my idea: +# +# Each line starts with the variable name, there are then two possible +# options for each variable DEFAULT and OVERRIDE. +# DEFAULT allows an administrator to set the value of the +# variable to some default value, if none is supplied then the empty +# string is assumed. The OVERRIDE option tells pam_env that it should +# enter in its value (overriding the default value) if there is one +# to use. OVERRIDE is not used, "" is assumed and no override will be +# done. +# +# VARIABLE [DEFAULT=[value]] [OVERRIDE=[value]] +# +# (Possibly non-existent) environment variables may be used in values +# using the ${string} syntax and (possibly non-existent) PAM_ITEMs may +# be used in values using the @{string} syntax. Both the $ and @ +# characters can be backslash escaped to be used as literal values +# values can be delimited with "", escaped " not supported. +# Note that many environment variables that you would like to use +# may not be set by the time the module is called. +# For example, HOME is used below several times, but +# many PAM applications don't make it available by the time you need it. +# +# +# First, some special variables +# +# Set the REMOTEHOST variable for any hosts that are remote, default +# to "localhost" rather than not being set at all +#REMOTEHOST DEFAULT=localhost OVERRIDE=@{PAM_RHOST} +# +# Set the DISPLAY variable if it seems reasonable +#DISPLAY DEFAULT=${REMOTEHOST}:0.0 OVERRIDE=${DISPLAY} +# +# +# Now some simple variables +# +#PAGER DEFAULT=less +#MANPAGER DEFAULT=less +#LESS DEFAULT="M q e h15 z23 b80" +#NNTPSERVER DEFAULT=localhost +#PATH DEFAULT=${HOME}/bin:/usr/local/bin:/bin\ +#:/usr/bin:/usr/local/bin/X11:/usr/bin/X11 +# +# silly examples of escaped variables, just to show how they work. +# +#DOLLAR DEFAULT=\$ +#DOLLARDOLLAR DEFAULT= OVERRIDE=\$${DOLLAR} +#DOLLARPLUS DEFAULT=\${REMOTEHOST}${REMOTEHOST} +#ATSIGN DEFAULT="" OVERRIDE=\@ diff --git a/modules/pam_env/pam_env.conf.5 b/modules/pam_env/pam_env.conf.5 new file mode 100644 index 0000000..3a7155b --- /dev/null +++ b/modules/pam_env/pam_env.conf.5 @@ -0,0 +1,132 @@ +'\" t +.\" Title: pam_env.conf +.\" 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_ENV\&.CONF" "5" "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_env.conf, environment \- the environment variables config files +.SH "DESCRIPTION" +.PP +The +/etc/security/pam_env\&.conf +file specifies the environment variables to be set, unset or modified by +\fBpam_env\fR(8)\&. When someone logs in, this file is read and the environment variables are set according\&. +.PP +Each line starts with the variable name, there are then two possible options for each variable DEFAULT and OVERRIDE\&. DEFAULT allows and administrator to set the value of the variable to some default value, if none is supplied then the empty string is assumed\&. The OVERRIDE option tells pam_env that it should enter in its value (overriding the default value) if there is one to use\&. OVERRIDE is not used, "" is assumed and no override will be done\&. +.PP +\fIVARIABLE\fR +[\fIDEFAULT=[value]\fR] [\fIOVERRIDE=[value]\fR] +.PP +(Possibly non\-existent) environment variables may be used in values using the ${string} syntax and (possibly non\-existent) PAM_ITEMs as well as HOME and SHELL may be used in values using the @{string} syntax\&. Both the $ and @ characters can be backslash escaped to be used as literal values values can be delimited with "", escaped " not supported\&. Note that many environment variables that you would like to use may not be set by the time the module is called\&. For example, ${HOME} is used below several times, but many PAM applications don\*(Aqt make it available by the time you need it\&. The special variables @{HOME} and @{SHELL} are expanded to the values for the user from his +\fIpasswd\fR +entry\&. +.PP +The "\fI#\fR" character at start of line (no space at front) can be used to mark this line as a comment line\&. +.PP +The +/etc/environment +file specifies the environment variables to be set\&. The file must consist of simple +\fINAME=VALUE\fR +pairs on separate lines\&. The +\fBpam_env\fR(8) +module will read the file after the +pam_env\&.conf +file\&. +.SH "EXAMPLES" +.PP +These are some example lines which might be specified in +/etc/security/pam_env\&.conf\&. +.PP +Set the REMOTEHOST variable for any hosts that are remote, default to "localhost" rather than not being set at all +.sp +.if n \{\ +.RS 4 +.\} +.nf + REMOTEHOST DEFAULT=localhost OVERRIDE=@{PAM_RHOST} + +.fi +.if n \{\ +.RE +.\} +.PP +Set the DISPLAY variable if it seems reasonable +.sp +.if n \{\ +.RS 4 +.\} +.nf + DISPLAY DEFAULT=${REMOTEHOST}:0\&.0 OVERRIDE=${DISPLAY} + +.fi +.if n \{\ +.RE +.\} +.PP +Now some simple variables +.sp +.if n \{\ +.RS 4 +.\} +.nf + PAGER DEFAULT=less + MANPAGER DEFAULT=less + LESS DEFAULT="M q e h15 z23 b80" + NNTPSERVER DEFAULT=localhost + PATH DEFAULT=${HOME}/bin:/usr/local/bin:/bin\e + :/usr/bin:/usr/local/bin/X11:/usr/bin/X11 + XDG_DATA_HOME @{HOME}/share/ + +.fi +.if n \{\ +.RE +.\} +.PP +Silly examples of escaped variables, just to show how they work\&. +.sp +.if n \{\ +.RS 4 +.\} +.nf + DOLLAR DEFAULT=\e$ + DOLLARDOLLAR DEFAULT= OVERRIDE=\e$${DOLLAR} + DOLLARPLUS DEFAULT=\e${REMOTEHOST}${REMOTEHOST} + ATSIGN DEFAULT="" OVERRIDE=\e@ + +.fi +.if n \{\ +.RE +.\} +.SH "SEE ALSO" +.PP +\fBpam_env\fR(8), +\fBpam.d\fR(5), +\fBpam\fR(8), +\fBenviron\fR(7) +.SH "AUTHOR" +.PP +pam_env was written by Dave Kinchlea \&. diff --git a/modules/pam_env/pam_env.conf.5.xml b/modules/pam_env/pam_env.conf.5.xml new file mode 100644 index 0000000..c47f17d --- /dev/null +++ b/modules/pam_env/pam_env.conf.5.xml @@ -0,0 +1,136 @@ + + + + + + + pam_env.conf + 5 + Linux-PAM Manual + + + + pam_env.conf + environment + the environment variables config files + + + + + DESCRIPTION + + + The /etc/security/pam_env.conf file specifies + the environment variables to be set, unset or modified by + pam_env8. + When someone logs in, this file is read and the environment + variables are set according. + + + Each line starts with the variable name, there are then two possible + options for each variable DEFAULT and OVERRIDE. DEFAULT allows and + administrator to set the value of the variable to some default + value, if none is supplied then the empty string is assumed. The + OVERRIDE option tells pam_env that it should enter in its value + (overriding the default value) if there is one to use. OVERRIDE is + not used, "" is assumed and no override will be done. + + + VARIABLE + [DEFAULT=[value]] + [OVERRIDE=[value]] + + + + (Possibly non-existent) environment variables may be used in values + using the ${string} syntax and (possibly non-existent) PAM_ITEMs as well + as HOME and SHELL may be used in values using the @{string} syntax. Both + the $ and @ characters can be backslash escaped to be used as literal values + values can be delimited with "", escaped " not supported. + Note that many environment variables that you would like to use + may not be set by the time the module is called. + For example, ${HOME} is used below several times, but + many PAM applications don't make it available by the time you need it. + The special variables @{HOME} and @{SHELL} are expanded to the values + for the user from his passwd entry. + + + + The "#" character at start of line (no space + at front) can be used to mark this line as a comment line. + + + + The /etc/environment file specifies + the environment variables to be set. The file must consist of simple + NAME=VALUE pairs on separate lines. + The pam_env8 + module will read the file after the pam_env.conf + file. + + + + + EXAMPLES + + These are some example lines which might be specified in + /etc/security/pam_env.conf. + + + + Set the REMOTEHOST variable for any hosts that are remote, default + to "localhost" rather than not being set at all + + + REMOTEHOST DEFAULT=localhost OVERRIDE=@{PAM_RHOST} + + + + Set the DISPLAY variable if it seems reasonable + + + DISPLAY DEFAULT=${REMOTEHOST}:0.0 OVERRIDE=${DISPLAY} + + + + Now some simple variables + + + PAGER DEFAULT=less + MANPAGER DEFAULT=less + LESS DEFAULT="M q e h15 z23 b80" + NNTPSERVER DEFAULT=localhost + PATH DEFAULT=${HOME}/bin:/usr/local/bin:/bin\ + :/usr/bin:/usr/local/bin/X11:/usr/bin/X11 + XDG_DATA_HOME @{HOME}/share/ + + + + Silly examples of escaped variables, just to show how they work. + + + DOLLAR DEFAULT=\$ + DOLLARDOLLAR DEFAULT= OVERRIDE=\$${DOLLAR} + DOLLARPLUS DEFAULT=\${REMOTEHOST}${REMOTEHOST} + ATSIGN DEFAULT="" OVERRIDE=\@ + + + + + SEE ALSO + + pam_env8, + pam.d5, + pam8, + environ7 + + + + + AUTHOR + + pam_env was written by Dave Kinchlea <kinch@kinch.ark.com>. + + + diff --git a/modules/pam_env/tst-pam_env b/modules/pam_env/tst-pam_env new file mode 100755 index 0000000..c40e70a --- /dev/null +++ b/modules/pam_env/tst-pam_env @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_env.so -- cgit v1.2.3