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-rw-r--r--modules/pam_keyinit/Makefile.am33
-rw-r--r--modules/pam_keyinit/Makefile.in1150
-rw-r--r--modules/pam_keyinit/README67
-rw-r--r--modules/pam_keyinit/README.xml41
-rw-r--r--modules/pam_keyinit/pam_keyinit.8150
-rw-r--r--modules/pam_keyinit/pam_keyinit.8.xml250
-rw-r--r--modules/pam_keyinit/pam_keyinit.c298
-rwxr-xr-xmodules/pam_keyinit/tst-pam_keyinit2
8 files changed, 1991 insertions, 0 deletions
diff --git a/modules/pam_keyinit/Makefile.am b/modules/pam_keyinit/Makefile.am
new file mode 100644
index 0000000..e195331
--- /dev/null
+++ b/modules/pam_keyinit/Makefile.am
@@ -0,0 +1,33 @@
+#
+# Copyright (c) 2006, 2009 David Howells <dhowells@redhat.com>
+#
+
+CLEANFILES = *~
+MAINTAINERCLEANFILES = $(MANS) README
+
+EXTRA_DIST = $(XMLS)
+
+if HAVE_DOC
+dist_man_MANS = pam_keyinit.8
+endif
+XMLS = README.xml pam_keyinit.8.xml
+dist_check_SCRIPTS = tst-pam_keyinit
+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_keyinit.la
+pam_keyinit_la_LIBADD = $(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_keyinit/Makefile.in b/modules/pam_keyinit/Makefile.in
new file mode 100644
index 0000000..600c19c
--- /dev/null
+++ b/modules/pam_keyinit/Makefile.in
@@ -0,0 +1,1150 @@
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diff --git a/modules/pam_keyinit/README b/modules/pam_keyinit/README
new file mode 100644
index 0000000..fa50370
--- /dev/null
+++ b/modules/pam_keyinit/README
@@ -0,0 +1,67 @@
+pam_keyinit — Kernel session keyring initialiser module
+
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+DESCRIPTION
+
+The pam_keyinit PAM module ensures that the invoking process has a session
+keyring other than the user default session keyring.
+
+The module checks to see if the process's session keyring is the
+user-session-keyring(7), and, if it is, creates a new session-keyring(7) with
+which to replace it. If a new session keyring is created, it will install a
+link to the user-keyring(7) in the session keyring so that keys common to the
+user will be automatically accessible through it. The session keyring of the
+invoking process will thenceforth be inherited by all its children unless they
+override it.
+
+In order to allow other PAM modules to attach tokens to the keyring, this
+module provides both an auth (limited to pam_setcred(3) and a session
+component. The session keyring is created in the module called. Moreover this
+module should be included as early as possible in a PAM configuration.
+
+This module is intended primarily for use by login processes. Be aware that
+after the session keyring has been replaced, the old session keyring and the
+keys it contains will no longer be accessible.
+
+This module should not, generally, be invoked by programs like su, since it is
+usually desirable for the key set to percolate through to the alternate
+context. The keys have their own permissions system to manage this.
+
+The keyutils package is used to manipulate keys more directly. This can be
+obtained from:
+
+Keyutils
+
+OPTIONS
+
+debug
+
+ Log debug information with syslog(3).
+
+force
+
+ Causes the session keyring of the invoking process to be replaced
+ unconditionally.
+
+revoke
+
+ Causes the session keyring of the invoking process to be revoked when the
+ invoking process exits if the session keyring was created for this process
+ in the first place.
+
+EXAMPLES
+
+Add this line to your login entries to start each login session with its own
+session keyring:
+
+session required pam_keyinit.so
+
+
+This will prevent keys from one session leaking into another session for the
+same user.
+
+AUTHOR
+
+pam_keyinit was written by David Howells, <dhowells@redhat.com>.
+
diff --git a/modules/pam_keyinit/README.xml b/modules/pam_keyinit/README.xml
new file mode 100644
index 0000000..47659e8
--- /dev/null
+++ b/modules/pam_keyinit/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_keyinit.8.xml">
+-->
+]>
+
+<article>
+
+ <articleinfo>
+
+ <title>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_keyinit.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_keyinit-name"]/*)'/>
+ </title>
+
+ </articleinfo>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_keyinit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_keyinit-description"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_keyinit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_keyinit-options"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_keyinit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_keyinit-examples"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_keyinit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_keyinit-author"]/*)'/>
+ </section>
+
+</article>
diff --git a/modules/pam_keyinit/pam_keyinit.8 b/modules/pam_keyinit/pam_keyinit.8
new file mode 100644
index 0000000..01bfa52
--- /dev/null
+++ b/modules/pam_keyinit/pam_keyinit.8
@@ -0,0 +1,150 @@
+'\" t
+.\" Title: pam_keyinit
+.\" 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_KEYINIT" "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_keyinit \- Kernel session keyring initialiser module
+.SH "SYNOPSIS"
+.HP \w'\fBpam_keyinit\&.so\fR\ 'u
+\fBpam_keyinit\&.so\fR [debug] [force] [revoke]
+.SH "DESCRIPTION"
+.PP
+The pam_keyinit PAM module ensures that the invoking process has a session keyring other than the user default session keyring\&.
+.PP
+The module checks to see if the process\*(Aqs session keyring is the
+\fBuser-session-keyring\fR(7), and, if it is, creates a new
+\fBsession-keyring\fR(7)
+with which to replace it\&. If a new session keyring is created, it will install a link to the
+\fBuser-keyring\fR(7)
+in the session keyring so that keys common to the user will be automatically accessible through it\&. The session keyring of the invoking process will thenceforth be inherited by all its children unless they override it\&.
+.PP
+In order to allow other PAM modules to attach tokens to the keyring, this module provides both an
+\fIauth\fR
+(limited to
+\fBpam_setcred\fR(3)
+and a
+\fIsession\fR
+component\&. The session keyring is created in the module called\&. Moreover this module should be included as early as possible in a PAM configuration\&.
+.PP
+This module is intended primarily for use by login processes\&. Be aware that after the session keyring has been replaced, the old session keyring and the keys it contains will no longer be accessible\&.
+.PP
+This module should not, generally, be invoked by programs like
+\fBsu\fR, since it is usually desirable for the key set to percolate through to the alternate context\&. The keys have their own permissions system to manage this\&.
+.PP
+The keyutils package is used to manipulate keys more directly\&. This can be obtained from:
+.PP
+\m[blue]\fBKeyutils\fR\m[]\&\s-2\u[1]\d\s+2
+.SH "OPTIONS"
+.PP
+\fBdebug\fR
+.RS 4
+Log debug information with
+\fBsyslog\fR(3)\&.
+.RE
+.PP
+\fBforce\fR
+.RS 4
+Causes the session keyring of the invoking process to be replaced unconditionally\&.
+.RE
+.PP
+\fBrevoke\fR
+.RS 4
+Causes the session keyring of the invoking process to be revoked when the invoking process exits if the session keyring was created for this process in the first place\&.
+.RE
+.SH "MODULE TYPES PROVIDED"
+.PP
+Only the
+\fBsession\fR
+module type is provided\&.
+.SH "RETURN VALUES"
+.PP
+PAM_SUCCESS
+.RS 4
+This module will usually return this value
+.RE
+.PP
+PAM_AUTH_ERR
+.RS 4
+Authentication failure\&.
+.RE
+.PP
+PAM_BUF_ERR
+.RS 4
+Memory buffer error\&.
+.RE
+.PP
+PAM_IGNORE
+.RS 4
+The return value should be ignored by PAM dispatch\&.
+.RE
+.PP
+PAM_SERVICE_ERR
+.RS 4
+Cannot determine the user name\&.
+.RE
+.PP
+PAM_SESSION_ERR
+.RS 4
+This module will return this value if its arguments are invalid or if a system error such as ENOMEM occurs\&.
+.RE
+.PP
+PAM_USER_UNKNOWN
+.RS 4
+User not known\&.
+.RE
+.SH "EXAMPLES"
+.PP
+Add this line to your login entries to start each login session with its own session keyring:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+session required pam_keyinit\&.so
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+This will prevent keys from one session leaking into another session for the same user\&.
+.SH "SEE ALSO"
+.PP
+\fBpam.conf\fR(5),
+\fBpam.d\fR(5),
+\fBpam\fR(8),
+\fBkeyctl\fR(1)
+.SH "AUTHOR"
+.PP
+pam_keyinit was written by David Howells, <dhowells@redhat\&.com>\&.
+.SH "NOTES"
+.IP " 1." 4
+Keyutils
+.RS 4
+\%http://people.redhat.com/~dhowells/keyutils/
+.RE
diff --git a/modules/pam_keyinit/pam_keyinit.8.xml b/modules/pam_keyinit/pam_keyinit.8.xml
new file mode 100644
index 0000000..ff1e7d0
--- /dev/null
+++ b/modules/pam_keyinit/pam_keyinit.8.xml
@@ -0,0 +1,250 @@
+<?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_keyinit">
+
+ <refmeta>
+ <refentrytitle>pam_keyinit</refentrytitle>
+ <manvolnum>8</manvolnum>
+ <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
+ </refmeta>
+
+ <refnamediv id="pam_keyinit-name">
+ <refname>pam_keyinit</refname>
+ <refpurpose>Kernel session keyring initialiser module</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis id="pam_keyinit-cmdsynopsis">
+ <command>pam_keyinit.so</command>
+ <arg choice="opt">
+ debug
+ </arg>
+ <arg choice="opt">
+ force
+ </arg>
+ <arg choice="opt">
+ revoke
+ </arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1 id="pam_keyinit-description">
+ <title>DESCRIPTION</title>
+ <para>
+ The pam_keyinit PAM module ensures that the invoking process has a
+ session keyring other than the user default session keyring.
+ </para>
+ <para>
+ The module checks to see if the process's session keyring is the
+ <citerefentry>
+ <refentrytitle>user-session-keyring</refentrytitle><manvolnum>7</manvolnum>
+ </citerefentry>,
+ and, if it is, creates a new
+ <citerefentry>
+ <refentrytitle>session-keyring</refentrytitle><manvolnum>7</manvolnum>
+ </citerefentry>
+ with which to replace it. If a new session keyring is created, it will
+ install a link to the
+ <citerefentry>
+ <refentrytitle>user-keyring</refentrytitle><manvolnum>7</manvolnum>
+ </citerefentry>
+ in the session keyring so that keys common to the user will be
+ automatically accessible through it. The session keyring of the invoking
+ process will thenceforth be inherited by all its children unless they override it.
+ </para>
+ <para>
+ In order to allow other PAM modules to attach tokens to the keyring, this module
+ provides both an <emphasis>auth</emphasis> (limited to
+ <citerefentry>
+ <refentrytitle>pam_setcred</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>
+ and a <emphasis>session</emphasis> component. The session keyring is created
+ in the module called. Moreover this module should be included as early as
+ possible in a PAM configuration.
+ </para>
+ <para>
+ This module is intended primarily for use by login processes. Be aware
+ that after the session keyring has been replaced, the old session keyring
+ and the keys it contains will no longer be accessible.
+ </para>
+ <para>
+ This module should not, generally, be invoked by programs like
+ <emphasis remap='B'>su</emphasis>, since it is usually desirable for the
+ key set to percolate through to the alternate context. The keys have
+ their own permissions system to manage this.
+ </para>
+ <para>
+ The keyutils package is used to manipulate keys more directly. This
+ can be obtained from:
+ </para>
+ <para>
+ <ulink url="http://people.redhat.com/~dhowells/keyutils/">
+ Keyutils
+ </ulink>
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_keyinit-options">
+ <title>OPTIONS</title>
+ <variablelist>
+ <varlistentry>
+ <term>
+ <option>debug</option>
+ </term>
+ <listitem>
+ <para>
+ Log debug information with <citerefentry>
+ <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>
+ <option>force</option>
+ </term>
+ <listitem>
+ <para>
+ Causes the session keyring of the invoking process to be replaced
+ unconditionally.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>
+ <option>revoke</option>
+ </term>
+ <listitem>
+ <para>
+ Causes the session keyring of the invoking process to be revoked
+ when the invoking process exits if the session keyring was created
+ for this process in the first place.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id="pam_keyinit-types">
+ <title>MODULE TYPES PROVIDED</title>
+ <para>
+ Only the <option>session</option> module type is provided.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_keyinit-return_values'>
+ <title>RETURN VALUES</title>
+ <variablelist>
+ <varlistentry>
+ <term>PAM_SUCCESS</term>
+ <listitem>
+ <para>
+ This module will usually return this value
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_AUTH_ERR</term>
+ <listitem>
+ <para>
+ Authentication failure.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_BUF_ERR</term>
+ <listitem>
+ <para>
+ Memory buffer error.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_IGNORE</term>
+ <listitem>
+ <para>
+ The return value should be ignored by PAM dispatch.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_SERVICE_ERR</term>
+ <listitem>
+ <para>
+ Cannot determine the user name.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_SESSION_ERR</term>
+ <listitem>
+ <para>
+ This module will return this value if its arguments are invalid or
+ if a system error such as ENOMEM occurs.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_USER_UNKNOWN</term>
+ <listitem>
+ <para>
+ User not known.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='pam_keyinit-examples'>
+ <title>EXAMPLES</title>
+ <para>
+ Add this line to your login entries to start each login session with its
+ own session keyring:
+ <programlisting>
+session required pam_keyinit.so
+ </programlisting>
+ </para>
+ <para>
+ This will prevent keys from one session leaking into another session for
+ the same user.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_keyinit-see_also'>
+ <title>SEE ALSO</title>
+ <para>
+ <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>,
+ <citerefentry>
+ <refentrytitle>keyctl</refentrytitle><manvolnum>1</manvolnum>
+ </citerefentry>
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_keyinit-author'>
+ <title>AUTHOR</title>
+ <para>
+ pam_keyinit was written by David Howells, &lt;dhowells@redhat.com&gt;.
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/modules/pam_keyinit/pam_keyinit.c b/modules/pam_keyinit/pam_keyinit.c
new file mode 100644
index 0000000..92e4953
--- /dev/null
+++ b/modules/pam_keyinit/pam_keyinit.c
@@ -0,0 +1,298 @@
+/*
+ * pam_keyinit: Initialise the session keyring on login through a PAM module
+ *
+ * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include "config.h"
+#include <stdarg.h>
+#include <string.h>
+#include <syslog.h>
+#include <pwd.h>
+#include <unistd.h>
+#include <errno.h>
+#include <security/pam_modules.h>
+#include <security/pam_modutil.h>
+#include <security/pam_ext.h>
+#include <sys/syscall.h>
+
+#define KEY_SPEC_SESSION_KEYRING -3 /* ID for session keyring */
+#define KEY_SPEC_USER_KEYRING -4 /* ID for UID-specific keyring */
+#define KEY_SPEC_USER_SESSION_KEYRING -5 /* - key ID for UID-session keyring */
+
+#define KEYCTL_GET_KEYRING_ID 0 /* ask for a keyring's ID */
+#define KEYCTL_JOIN_SESSION_KEYRING 1 /* start named session keyring */
+#define KEYCTL_REVOKE 3 /* revoke a key */
+#define KEYCTL_LINK 8 /* link a key into a keyring */
+
+static int my_session_keyring = 0;
+static int session_counter = 0;
+static int do_revoke = 0;
+static uid_t revoke_as_uid;
+static gid_t revoke_as_gid;
+static int xdebug = 0;
+
+static void debug(pam_handle_t *pamh, const char *fmt, ...)
+ __attribute__((format(printf, 2, 3)));
+
+static void debug(pam_handle_t *pamh, const char *fmt, ...)
+{
+ va_list va;
+
+ if (xdebug) {
+ va_start(va, fmt);
+ pam_vsyslog(pamh, LOG_DEBUG, fmt, va);
+ va_end(va);
+ }
+}
+
+static void error(pam_handle_t *pamh, const char *fmt, ...)
+ __attribute__((format(printf, 2, 3)));
+
+static void error(pam_handle_t *pamh, const char *fmt, ...)
+{
+ va_list va;
+
+ va_start(va, fmt);
+ pam_vsyslog(pamh, LOG_ERR, fmt, va);
+ va_end(va);
+}
+
+/*
+ * initialise the session keyring for this process
+ */
+static int init_keyrings(pam_handle_t *pamh, int force, int error_ret)
+{
+ int session, usession, ret;
+
+ if (!force) {
+ /* get the IDs of the session keyring and the user session
+ * keyring */
+ session = syscall(__NR_keyctl,
+ KEYCTL_GET_KEYRING_ID,
+ KEY_SPEC_SESSION_KEYRING,
+ 0);
+ debug(pamh, "GET SESSION = %d", session);
+ if (session < 0) {
+ /* don't worry about keyrings if facility not
+ * installed */
+ if (errno == ENOSYS)
+ return PAM_SUCCESS;
+ return error_ret;
+ }
+
+ usession = syscall(__NR_keyctl,
+ KEYCTL_GET_KEYRING_ID,
+ KEY_SPEC_USER_SESSION_KEYRING,
+ 0);
+ debug(pamh, "GET SESSION = %d", usession);
+ if (usession < 0)
+ return error_ret;
+
+ /* if the user session keyring is our keyring, then we don't
+ * need to do anything if we're not forcing */
+ if (session != usession)
+ return PAM_SUCCESS;
+ }
+
+ /* create a session keyring, discarding the old one */
+ ret = syscall(__NR_keyctl,
+ KEYCTL_JOIN_SESSION_KEYRING,
+ NULL);
+ debug(pamh, "JOIN = %d", ret);
+ if (ret < 0)
+ return error_ret;
+
+ my_session_keyring = ret;
+
+ /* make a link from the session keyring to the user keyring */
+ ret = syscall(__NR_keyctl,
+ KEYCTL_LINK,
+ KEY_SPEC_USER_KEYRING,
+ KEY_SPEC_SESSION_KEYRING);
+
+ return ret < 0 ? error_ret : PAM_SUCCESS;
+}
+
+/*
+ * revoke the session keyring for this process
+ */
+static int kill_keyrings(pam_handle_t *pamh, int error_ret)
+{
+ uid_t old_uid;
+ gid_t old_gid;
+ int ret = PAM_SUCCESS;
+
+ /* revoke the session keyring we created earlier */
+ if (my_session_keyring > 0) {
+ debug(pamh, "REVOKE %d", my_session_keyring);
+
+ old_uid = geteuid();
+ old_gid = getegid();
+ debug(pamh, "UID:%d [%d] GID:%d [%d]",
+ revoke_as_uid, old_uid, revoke_as_gid, old_gid);
+
+ /* switch to the real UID and GID so that we have permission to
+ * revoke the key */
+ if (revoke_as_gid != old_gid && setregid(-1, revoke_as_gid) < 0) {
+ error(pamh, "Unable to change GID to %d temporarily\n", revoke_as_gid);
+ return error_ret;
+ }
+
+ if (revoke_as_uid != old_uid && setresuid(-1, revoke_as_uid, old_uid) < 0) {
+ error(pamh, "Unable to change UID to %d temporarily\n", revoke_as_uid);
+ if (getegid() != old_gid && setregid(-1, old_gid) < 0)
+ error(pamh, "Unable to change GID back to %d\n", old_gid);
+ return error_ret;
+ }
+
+ if (syscall(__NR_keyctl, KEYCTL_REVOKE, my_session_keyring) < 0) {
+ ret = error_ret;
+ }
+
+ /* return to the original UID and GID (probably root) */
+ if (revoke_as_uid != old_uid && setreuid(-1, old_uid) < 0) {
+ error(pamh, "Unable to change UID back to %d\n", old_uid);
+ ret = error_ret;
+ }
+
+ if (revoke_as_gid != old_gid && setregid(-1, old_gid) < 0) {
+ error(pamh, "Unable to change GID back to %d\n", old_gid);
+ ret = error_ret;
+ }
+
+ my_session_keyring = 0;
+ }
+ return ret;
+}
+
+static int do_keyinit(pam_handle_t *pamh, int argc, const char **argv, int error_ret)
+{
+ struct passwd *pw;
+ const char *username;
+ int ret, loop, force = 0;
+ uid_t old_uid, uid;
+ gid_t old_gid, gid;
+
+ for (loop = 0; loop < argc; loop++) {
+ if (strcmp(argv[loop], "force") == 0)
+ force = 1;
+ else if (strcmp(argv[loop], "debug") == 0)
+ xdebug = 1;
+ else if (strcmp(argv[loop], "revoke") == 0)
+ do_revoke = 1;
+ }
+
+ /* don't do anything if already created a keyring (will be called
+ * multiple times if mentioned more than once in a pam script)
+ */
+ if (my_session_keyring > 0)
+ return PAM_SUCCESS;
+
+ /* look up the target UID */
+ ret = pam_get_user(pamh, &username, "key user");
+ if (ret != PAM_SUCCESS)
+ return ret;
+
+ pw = pam_modutil_getpwnam(pamh, username);
+ if (!pw) {
+ pam_syslog(pamh, LOG_NOTICE, "Unable to look up user \"%s\"\n",
+ username);
+ return PAM_USER_UNKNOWN;
+ }
+
+ revoke_as_uid = uid = pw->pw_uid;
+ old_uid = getuid();
+ revoke_as_gid = gid = pw->pw_gid;
+ old_gid = getgid();
+ debug(pamh, "UID:%d [%d] GID:%d [%d]", uid, old_uid, gid, old_gid);
+
+ /* switch to the real UID and GID so that the keyring ends up owned by
+ * the right user */
+ if (gid != old_gid && setregid(gid, -1) < 0) {
+ error(pamh, "Unable to change GID to %d temporarily\n", gid);
+ return error_ret;
+ }
+
+ if (uid != old_uid && setreuid(uid, -1) < 0) {
+ error(pamh, "Unable to change UID to %d temporarily\n", uid);
+ if (setregid(old_gid, -1) < 0)
+ error(pamh, "Unable to change GID back to %d\n", old_gid);
+ return error_ret;
+ }
+
+ ret = init_keyrings(pamh, force, error_ret);
+
+ /* return to the original UID and GID (probably root) */
+ if (uid != old_uid && setreuid(old_uid, -1) < 0) {
+ error(pamh, "Unable to change UID back to %d\n", old_uid);
+ ret = error_ret;
+ }
+
+ if (gid != old_gid && setregid(old_gid, -1) < 0) {
+ error(pamh, "Unable to change GID back to %d\n", old_gid);
+ ret = error_ret;
+ }
+
+ return ret;
+}
+
+/*
+ * Dummy
+ */
+int pam_sm_authenticate(pam_handle_t *pamh UNUSED, int flags UNUSED,
+ int argc UNUSED, const char **argv UNUSED)
+{
+ return PAM_IGNORE;
+}
+
+/*
+ * since setcred and open_session are called in different orders, a
+ * session ring is invoked by the first of these functions called.
+ */
+int pam_sm_setcred(pam_handle_t *pamh, int flags,
+ int argc, const char **argv)
+{
+ if (flags & PAM_ESTABLISH_CRED) {
+ debug(pamh, "ESTABLISH_CRED");
+ return do_keyinit(pamh, argc, argv, PAM_CRED_ERR);
+ }
+ if (flags & PAM_DELETE_CRED && my_session_keyring > 0 && do_revoke) {
+ debug(pamh, "DELETE_CRED");
+ return kill_keyrings(pamh, PAM_CRED_ERR);
+ }
+ return PAM_IGNORE;
+}
+
+int pam_sm_open_session(pam_handle_t *pamh, int flags UNUSED,
+ int argc, const char **argv)
+{
+ session_counter++;
+
+ debug(pamh, "OPEN %d", session_counter);
+
+ return do_keyinit(pamh, argc, argv, PAM_SESSION_ERR);
+}
+
+/*
+ * close a PAM session by revoking the session keyring if requested
+ */
+int pam_sm_close_session(pam_handle_t *pamh, int flags UNUSED,
+ int argc UNUSED, const char **argv UNUSED)
+{
+ debug(pamh, "CLOSE %d,%d,%d",
+ session_counter, my_session_keyring, do_revoke);
+
+ session_counter--;
+
+ if (session_counter <= 0 && my_session_keyring > 0 && do_revoke)
+ kill_keyrings(pamh, PAM_SESSION_ERR);
+
+ return PAM_SUCCESS;
+}
diff --git a/modules/pam_keyinit/tst-pam_keyinit b/modules/pam_keyinit/tst-pam_keyinit
new file mode 100755
index 0000000..f0a7b9b
--- /dev/null
+++ b/modules/pam_keyinit/tst-pam_keyinit
@@ -0,0 +1,2 @@
+#!/bin/sh
+../../tests/tst-dlopen .libs/pam_keyinit.so
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-07 12:23:45 +0000