diff options
Diffstat (limited to 'modules/pam_rootok')
-rw-r--r-- | modules/pam_rootok/Makefile.am | 36 | ||||
-rw-r--r-- | modules/pam_rootok/Makefile.in | 1180 | ||||
-rw-r--r-- | modules/pam_rootok/README | 33 | ||||
-rw-r--r-- | modules/pam_rootok/README.xml | 41 | ||||
-rw-r--r-- | modules/pam_rootok/pam_rootok.8 | 106 | ||||
-rw-r--r-- | modules/pam_rootok/pam_rootok.8.xml | 131 | ||||
-rw-r--r-- | modules/pam_rootok/pam_rootok.c | 174 | ||||
-rwxr-xr-x | modules/pam_rootok/tst-pam_rootok | 2 | ||||
-rw-r--r-- | modules/pam_rootok/tst-pam_rootok-retval.c | 72 |
9 files changed, 1775 insertions, 0 deletions
diff --git a/modules/pam_rootok/Makefile.am b/modules/pam_rootok/Makefile.am new file mode 100644 index 0000000..787218b --- /dev/null +++ b/modules/pam_rootok/Makefile.am @@ -0,0 +1,36 @@ +# +# Copyright (c) 2005, 2006, 2009 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ +MAINTAINERCLEANFILES = $(MANS) README + +EXTRA_DIST = $(XMLS) + +if HAVE_DOC +dist_man_MANS = pam_rootok.8 +endif +XMLS = README.xml pam_rootok.8.xml +dist_check_SCRIPTS = tst-pam_rootok +TESTS = $(dist_check_SCRIPTS) $(check_PROGRAMS) + +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_rootok.la +pam_rootok_la_LIBADD = $(top_builddir)/libpam/libpam.la @LIBSELINUX@ @LIBAUDIT@ + +check_PROGRAMS = tst-pam_rootok-retval +tst_pam_rootok_retval_LDADD = $(top_builddir)/libpam/libpam.la + +if ENABLE_REGENERATE_MAN +dist_noinst_DATA = README +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_rootok/Makefile.in b/modules/pam_rootok/Makefile.in new file mode 100644 index 0000000..d4422af --- /dev/null +++ b/modules/pam_rootok/Makefile.in @@ -0,0 +1,1180 @@ +# 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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It is the real UID +that is checked. + +OPTIONS + +debug + + Print debug information. + +EXAMPLES + +In the case of the su(1) application the historical usage is to permit the +superuser to adopt the identity of a lesser user without the use of a password. +To obtain this behavior with PAM the following pair of lines are needed for the +corresponding entry in the /etc/pam.d/su configuration file: + +# su authentication. Root is granted access by default. +auth sufficient pam_rootok.so +auth required pam_unix.so + + +AUTHOR + +pam_rootok was written by Andrew G. Morgan, <morgan@kernel.org>. + diff --git a/modules/pam_rootok/README.xml b/modules/pam_rootok/README.xml new file mode 100644 index 0000000..6fb58cd --- /dev/null +++ b/modules/pam_rootok/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_rootok.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rootok.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_rootok-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rootok.8.xml" xpointer='xpointer(//refsect1[@id = "pam_rootok-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rootok.8.xml" xpointer='xpointer(//refsect1[@id = "pam_rootok-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rootok.8.xml" xpointer='xpointer(//refsect1[@id = "pam_rootok-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rootok.8.xml" xpointer='xpointer(//refsect1[@id = "pam_rootok-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_rootok/pam_rootok.8 b/modules/pam_rootok/pam_rootok.8 new file mode 100644 index 0000000..861a6a6 --- /dev/null +++ b/modules/pam_rootok/pam_rootok.8 @@ -0,0 +1,106 @@ +'\" t +.\" Title: pam_rootok +.\" Author: [see the "AUTHOR" section] +.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/> +.\" Date: 09/03/2021 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "PAM_ROOTOK" "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_rootok \- Gain only root access +.SH "SYNOPSIS" +.HP \w'\fBpam_rootok\&.so\fR\ 'u +\fBpam_rootok\&.so\fR [debug] +.SH "DESCRIPTION" +.PP +pam_rootok is a PAM module that authenticates the user if their +\fIUID\fR +is +\fI0\fR\&. Applications that are created setuid\-root generally retain the +\fIUID\fR +of the user but run with the authority of an enhanced effective\-UID\&. It is the real +\fIUID\fR +that is checked\&. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Print debug information\&. +.RE +.SH "MODULE TYPES PROVIDED" +.PP +The +\fBauth\fR, +\fBaccount\fR +and +\fBpassword\fR +module types are provided\&. +.SH "RETURN VALUES" +.PP +PAM_SUCCESS +.RS 4 +The +\fIUID\fR +is +\fI0\fR\&. +.RE +.PP +PAM_AUTH_ERR +.RS 4 +The +\fIUID\fR +is +\fBnot\fR +\fI0\fR\&. +.RE +.SH "EXAMPLES" +.PP +In the case of the +\fBsu\fR(1) +application the historical usage is to permit the superuser to adopt the identity of a lesser user without the use of a password\&. To obtain this behavior with PAM the following pair of lines are needed for the corresponding entry in the +/etc/pam\&.d/su +configuration file: +.sp +.if n \{\ +.RS 4 +.\} +.nf +# su authentication\&. Root is granted access by default\&. +auth sufficient pam_rootok\&.so +auth required pam_unix\&.so + +.fi +.if n \{\ +.RE +.\} +.sp +.SH "SEE ALSO" +.PP +\fBsu\fR(1), +\fBpam.conf\fR(5), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_rootok was written by Andrew G\&. Morgan, <morgan@kernel\&.org>\&. diff --git a/modules/pam_rootok/pam_rootok.8.xml b/modules/pam_rootok/pam_rootok.8.xml new file mode 100644 index 0000000..06457bf --- /dev/null +++ b/modules/pam_rootok/pam_rootok.8.xml @@ -0,0 +1,131 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_rootok"> + + <refmeta> + <refentrytitle>pam_rootok</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_rootok-name"> + <refname>pam_rootok</refname> + <refpurpose>Gain only root access</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_rootok-cmdsynopsis"> + <command>pam_rootok.so</command> + <arg choice="opt"> + debug + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_rootok-description"> + + <title>DESCRIPTION</title> + + <para> + pam_rootok is a PAM module that authenticates the user if their + <emphasis>UID</emphasis> is <emphasis>0</emphasis>. + Applications that are created setuid-root generally retain the + <emphasis>UID</emphasis> of the user but run with the authority + of an enhanced effective-UID. It is the real <emphasis>UID</emphasis> + that is checked. + </para> + </refsect1> + + <refsect1 id="pam_rootok-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_rootok-types"> + <title>MODULE TYPES PROVIDED</title> + <para> + The <option>auth</option>, <option>account</option> and + <option>password</option> module types are provided. + </para> + </refsect1> + + <refsect1 id='pam_rootok-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The <emphasis>UID</emphasis> is <emphasis>0</emphasis>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + The <emphasis>UID</emphasis> is <emphasis remap='B'>not</emphasis> + <emphasis>0</emphasis>. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_rootok-examples'> + <title>EXAMPLES</title> + <para> + In the case of the <citerefentry> + <refentrytitle>su</refentrytitle><manvolnum>1</manvolnum> + </citerefentry> application the historical usage is to + permit the superuser to adopt the identity of a lesser user + without the use of a password. To obtain this behavior with PAM + the following pair of lines are needed for the corresponding entry + in the <filename>/etc/pam.d/su</filename> configuration file: + <programlisting> +# su authentication. Root is granted access by default. +auth sufficient pam_rootok.so +auth required pam_unix.so + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_rootok-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>su</refentrytitle><manvolnum>1</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_rootok-author'> + <title>AUTHOR</title> + <para> + pam_rootok was written by Andrew G. Morgan, <morgan@kernel.org>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_rootok/pam_rootok.c b/modules/pam_rootok/pam_rootok.c new file mode 100644 index 0000000..dd374c5 --- /dev/null +++ b/modules/pam_rootok/pam_rootok.c @@ -0,0 +1,174 @@ +/* + * pam_rootok module + * + * Written by Andrew Morgan <morgan@linux.kernel.org> 1996/3/11 + */ + +#include "config.h" + +#include <stdio.h> +#include <unistd.h> +#include <syslog.h> +#include <stdarg.h> +#include <string.h> + +#include <security/pam_modules.h> +#include <security/pam_ext.h> + +#ifdef WITH_SELINUX +#include <selinux/selinux.h> +#include <selinux/avc.h> +#endif + +#ifdef HAVE_LIBAUDIT +#include <libaudit.h> +#endif + +/* argument parsing */ + +#define PAM_DEBUG_ARG 01 + +static int +_pam_parse (const pam_handle_t *pamh, int argc, const char **argv) +{ + int ctrl=0; + + /* step through arguments */ + for (ctrl=0; argc-- > 0; ++argv) { + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + return ctrl; +} + +#ifdef WITH_SELINUX +static int +PAM_FORMAT((printf, 2, 3)) +log_callback (int type UNUSED, const char *fmt, ...) +{ + int audit_fd; + va_list ap; + +#ifdef HAVE_LIBAUDIT + audit_fd = audit_open(); + + if (audit_fd >= 0) { + char *buf; + int ret; + + va_start(ap, fmt); + ret = vasprintf (&buf, fmt, ap); + va_end(ap); + if (ret < 0) { + return 0; + } + audit_log_user_avc_message(audit_fd, AUDIT_USER_AVC, buf, NULL, NULL, + NULL, 0); + audit_close(audit_fd); + free(buf); + va_end(ap); + return 0; + } + +#endif + va_start(ap, fmt); + vsyslog (LOG_USER | LOG_INFO, fmt, ap); + va_end(ap); + return 0; +} + +static int +selinux_check_root (void) +{ + int status = -1; + char *user_context_raw; + union selinux_callback old_callback; + + if (is_selinux_enabled() < 1) + return 0; + + old_callback = selinux_get_callback(SELINUX_CB_LOG); + /* setup callbacks */ + selinux_set_callback(SELINUX_CB_LOG, (union selinux_callback) &log_callback); + if ((status = getprevcon_raw(&user_context_raw)) < 0) { + selinux_set_callback(SELINUX_CB_LOG, old_callback); + return status; + } + + status = selinux_check_access(user_context_raw, user_context_raw, "passwd", "rootok", NULL); + + selinux_set_callback(SELINUX_CB_LOG, old_callback); + freecon(user_context_raw); + return status; +} +#endif + +static int +check_for_root (pam_handle_t *pamh, int ctrl) +{ + int retval = PAM_AUTH_ERR; + + if (getuid() == 0) +#ifdef WITH_SELINUX + if (selinux_check_root() == 0 || security_getenforce() == 0) +#endif + retval = PAM_SUCCESS; + + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, "root check %s", + (retval==PAM_SUCCESS) ? "succeeded" : "failed"); + } + + return retval; +} + +/* --- management functions --- */ + +int +pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int ctrl; + + ctrl = _pam_parse(pamh, argc, argv); + + return check_for_root (pamh, ctrl); +} + +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 UNUSED, + int argc, const char **argv) +{ + int ctrl; + + ctrl = _pam_parse(pamh, argc, argv); + + return check_for_root (pamh, ctrl); +} + +int +pam_sm_chauthtok (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int ctrl; + + ctrl = _pam_parse(pamh, argc, argv); + + return check_for_root (pamh, ctrl); +} + +/* end of module definition */ diff --git a/modules/pam_rootok/tst-pam_rootok b/modules/pam_rootok/tst-pam_rootok new file mode 100755 index 0000000..385ef76 --- /dev/null +++ b/modules/pam_rootok/tst-pam_rootok @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_rootok.so diff --git a/modules/pam_rootok/tst-pam_rootok-retval.c b/modules/pam_rootok/tst-pam_rootok-retval.c new file mode 100644 index 0000000..b179701 --- /dev/null +++ b/modules/pam_rootok/tst-pam_rootok-retval.c @@ -0,0 +1,72 @@ +/* + * Check pam_rootok return values. + * + * Copyright (c) 2020 Dmitry V. Levin <ldv@altlinux.org> + */ + +#include "test_assert.h" + +#include <limits.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <security/pam_appl.h> + +#define MODULE_NAME "pam_rootok" +#define TEST_NAME "tst-" MODULE_NAME "-retval" + +static const char service_file[] = TEST_NAME ".service"; +static const char user_name[] = ""; +static struct pam_conv conv; + +int +main(void) +{ + pam_handle_t *pamh = NULL; + FILE *fp; + char cwd[PATH_MAX]; + + ASSERT_NE(NULL, getcwd(cwd, sizeof(cwd))); + + ASSERT_NE(NULL, fp = fopen(service_file, "w")); + ASSERT_LT(0, fprintf(fp, "#%%PAM-1.0\n" + "auth required %s/.libs/%s.so\n" + "account required %s/.libs/%s.so\n" + "password required %s/.libs/%s.so\n" + "session required %s/.libs/%s.so\n", + cwd, MODULE_NAME, + cwd, MODULE_NAME, + cwd, MODULE_NAME, + cwd, MODULE_NAME)); + ASSERT_EQ(0, fclose(fp)); + + ASSERT_EQ(PAM_SUCCESS, + pam_start_confdir(service_file, user_name, &conv, ".", &pamh)); + ASSERT_NE(NULL, pamh); + ASSERT_EQ(PAM_SUCCESS, pam_setcred(pamh, 0)); + ASSERT_EQ(PAM_SUCCESS, pam_end(pamh, 0)); + pamh = NULL; + + ASSERT_EQ(PAM_SUCCESS, + pam_start_confdir(service_file, user_name, &conv, ".", &pamh)); + ASSERT_NE(NULL, pamh); + if (getuid() == 0) { + ASSERT_EQ(PAM_SUCCESS, pam_authenticate(pamh, 0)); + ASSERT_EQ(PAM_SUCCESS, pam_setcred(pamh, 0)); + ASSERT_EQ(PAM_SUCCESS, pam_acct_mgmt(pamh, 0)); + ASSERT_EQ(PAM_SUCCESS, pam_chauthtok(pamh, 0)); + } else { + ASSERT_EQ(PAM_AUTH_ERR, pam_authenticate(pamh, 0)); + ASSERT_EQ(PAM_PERM_DENIED, pam_setcred(pamh, 0)); + ASSERT_EQ(PAM_AUTH_ERR, pam_acct_mgmt(pamh, 0)); + ASSERT_EQ(PAM_AUTH_ERR, pam_chauthtok(pamh, 0)); + } + ASSERT_EQ(PAM_MODULE_UNKNOWN, pam_open_session(pamh, 0)); + ASSERT_EQ(PAM_MODULE_UNKNOWN, pam_close_session(pamh, 0)); + ASSERT_EQ(PAM_SUCCESS, pam_end(pamh, 0)); + pamh = NULL; + + ASSERT_EQ(0, unlink(service_file)); + + return 0; +} |