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authorAlberto Gonzalez Iniesta <agi@inittab.org>2012-11-05 16:28:09 +0100
committerAlberto Gonzalez Iniesta <agi@inittab.org>2012-11-05 16:28:09 +0100
commit8dd0350e1607aa30f7a043c8d5ec7a7eeb874115 (patch)
tree566d0620eb693320cb121dfd93a5675fa704a30b /src/plugins/auth-pam
parent349cfa7acb95abe865209a28e417ec74b56f9bba (diff)
Imported Upstream version 2.3_rc1
Diffstat (limited to 'src/plugins/auth-pam')
-rw-r--r--src/plugins/auth-pam/Makefile.am27
-rw-r--r--src/plugins/auth-pam/Makefile.in619
-rw-r--r--src/plugins/auth-pam/README.auth-pam74
-rw-r--r--src/plugins/auth-pam/auth-pam.c806
-rw-r--r--src/plugins/auth-pam/auth-pam.exports4
-rw-r--r--src/plugins/auth-pam/pamdl.c184
-rw-r--r--src/plugins/auth-pam/pamdl.h5
7 files changed, 1719 insertions, 0 deletions
diff --git a/src/plugins/auth-pam/Makefile.am b/src/plugins/auth-pam/Makefile.am
new file mode 100644
index 0000000..701a749
--- /dev/null
+++ b/src/plugins/auth-pam/Makefile.am
@@ -0,0 +1,27 @@
+#
+# OpenVPN (TM) PAM Auth Plugin -- OpenVPN Plugin
+#
+# Copyright (C) 2012 Alon Bar-Lev <alon.barlev@gmail.com>
+#
+
+MAINTAINERCLEANFILES = \
+ $(srcdir)/Makefile.in
+
+AM_CFLAGS = \
+ -I$(top_srcdir)/include
+ $(PLUGIN_AUTH_PAM_CFLAGS)
+
+if ENABLE_PLUGIN_AUTH_PAM
+plugin_LTLIBRARIES = openvpn-plugin-auth-pam.la
+dist_doc_DATA = README.auth-pam
+endif
+
+openvpn_plugin_auth_pam_la_SOURCES = \
+ auth-pam.c \
+ pamdl.c pamdl.h \
+ auth-pam.exports
+openvpn_plugin_auth_pam_la_LIBADD = \
+ $(PLUGIN_AUTH_PAM_LIBS)
+openvpn_plugin_auth_pam_la_LDFLAGS = $(AM_LDFLAGS) \
+ -export-symbols "$(srcdir)/auth-pam.exports" \
+ -module -shared -avoid-version -no-undefined
diff --git a/src/plugins/auth-pam/Makefile.in b/src/plugins/auth-pam/Makefile.in
new file mode 100644
index 0000000..49e4063
--- /dev/null
+++ b/src/plugins/auth-pam/Makefile.in
@@ -0,0 +1,619 @@
+# Makefile.in generated by automake 1.11.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+# 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation,
+# Inc.
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+#
+# OpenVPN (TM) PAM Auth Plugin -- OpenVPN Plugin
+#
+# Copyright (C) 2012 Alon Bar-Lev <alon.barlev@gmail.com>
+#
+
+
+VPATH = @srcdir@
+pkgdatadir = $(datadir)/@PACKAGE@
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+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+build_triplet = @build@
+host_triplet = @host@
+subdir = src/plugins/auth-pam
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+am_openvpn_plugin_auth_pam_la_OBJECTS = auth-pam.lo pamdl.lo
+openvpn_plugin_auth_pam_la_OBJECTS = \
+ $(am_openvpn_plugin_auth_pam_la_OBJECTS)
+openvpn_plugin_auth_pam_la_LINK = $(LIBTOOL) --tag=CC \
+ $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=link $(CCLD) \
+ $(AM_CFLAGS) $(CFLAGS) $(openvpn_plugin_auth_pam_la_LDFLAGS) \
+ $(LDFLAGS) -o $@
+@ENABLE_PLUGIN_AUTH_PAM_TRUE@am_openvpn_plugin_auth_pam_la_rpath = \
+@ENABLE_PLUGIN_AUTH_PAM_TRUE@ -rpath $(plugindir)
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+IPROUTE = @IPROUTE@
+LD = @LD@
+LDFLAGS = @LDFLAGS@
+LIBOBJS = @LIBOBJS@
+LIBPAM_CFLAGS = @LIBPAM_CFLAGS@
+LIBPAM_LIBS = @LIBPAM_LIBS@
+LIBS = @LIBS@
+LIBTOOL = @LIBTOOL@
+LIPO = @LIPO@
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+LZO_CFLAGS = @LZO_CFLAGS@
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+OPENSSL_CRYPTO_CFLAGS = @OPENSSL_CRYPTO_CFLAGS@
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+PKG_CONFIG_PATH = @PKG_CONFIG_PATH@
+PLUGIN_AUTH_PAM_CFLAGS = @PLUGIN_AUTH_PAM_CFLAGS@
+PLUGIN_AUTH_PAM_LIBS = @PLUGIN_AUTH_PAM_LIBS@
+POLARSSL_CFLAGS = @POLARSSL_CFLAGS@
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+ $(srcdir)/Makefile.in
+
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+
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+@ENABLE_PLUGIN_AUTH_PAM_TRUE@dist_doc_DATA = README.auth-pam
+openvpn_plugin_auth_pam_la_SOURCES = \
+ auth-pam.c \
+ pamdl.c pamdl.h \
+ auth-pam.exports
+
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+ $(PLUGIN_AUTH_PAM_LIBS)
+
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+ done | \
+ $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
+ END { if (nonempty) { for (i in files) print i; }; }'`; \
+ shift; \
+ if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+ test -n "$$unique" || unique=$$empty_fix; \
+ if test $$# -gt 0; then \
+ $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+ "$$@" $$unique; \
+ else \
+ $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+ $$unique; \
+ fi; \
+ fi
+ctags: CTAGS
+CTAGS: $(HEADERS) $(SOURCES) $(TAGS_DEPENDENCIES) \
+ $(TAGS_FILES) $(LISP)
+ list='$(SOURCES) $(HEADERS) $(LISP) $(TAGS_FILES)'; \
+ unique=`for i in $$list; do \
+ if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
+ done | \
+ $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
+ END { if (nonempty) { for (i in files) print i; }; }'`; \
+ test -z "$(CTAGS_ARGS)$$unique" \
+ || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+ $$unique
+
+GTAGS:
+ here=`$(am__cd) $(top_builddir) && pwd` \
+ && $(am__cd) $(top_srcdir) \
+ && gtags -i $(GTAGS_ARGS) "$$here"
+
+distclean-tags:
+ -rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(DISTFILES)
+ @srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+ topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+ list='$(DISTFILES)'; \
+ dist_files=`for file in $$list; do echo $$file; done | \
+ sed -e "s|^$$srcdirstrip/||;t" \
+ -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+ case $$dist_files in \
+ */*) $(MKDIR_P) `echo "$$dist_files" | \
+ sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+ sort -u` ;; \
+ esac; \
+ for file in $$dist_files; do \
+ if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+ if test -d $$d/$$file; then \
+ dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+ if test -d "$(distdir)/$$file"; then \
+ find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+ fi; \
+ if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+ cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+ find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+ fi; \
+ cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+ else \
+ test -f "$(distdir)/$$file" \
+ || cp -p $$d/$$file "$(distdir)/$$file" \
+ || exit 1; \
+ fi; \
+ done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(DATA)
+installdirs:
+ for dir in "$(DESTDIR)$(plugindir)" "$(DESTDIR)$(docdir)"; do \
+ test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+ done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+ @$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+ $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+ install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+ `test -z '$(STRIP)' || \
+ echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+ -test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+ -test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+ @echo "This command is intended for maintainers to use"
+ @echo "it deletes files that may require special tools to rebuild."
+ -test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-pluginLTLIBRARIES \
+ mostlyclean-am
+
+distclean: distclean-am
+ -rm -rf ./$(DEPDIR)
+ -rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+ distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am: install-dist_docDATA install-pluginLTLIBRARIES
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+ -rm -rf ./$(DEPDIR)
+ -rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+ mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-dist_docDATA uninstall-pluginLTLIBRARIES
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS all all-am check check-am clean clean-generic \
+ clean-libtool clean-pluginLTLIBRARIES ctags distclean \
+ distclean-compile distclean-generic distclean-libtool \
+ distclean-tags distdir dvi dvi-am html html-am info info-am \
+ install install-am install-data install-data-am \
+ install-dist_docDATA install-dvi install-dvi-am install-exec \
+ install-exec-am install-html install-html-am install-info \
+ install-info-am install-man install-pdf install-pdf-am \
+ install-pluginLTLIBRARIES install-ps install-ps-am \
+ install-strip installcheck installcheck-am installdirs \
+ maintainer-clean maintainer-clean-generic mostlyclean \
+ mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+ pdf pdf-am ps ps-am tags uninstall uninstall-am \
+ uninstall-dist_docDATA uninstall-pluginLTLIBRARIES
+
+ $(PLUGIN_AUTH_PAM_CFLAGS)
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/plugins/auth-pam/README.auth-pam b/src/plugins/auth-pam/README.auth-pam
new file mode 100644
index 0000000..e123690
--- /dev/null
+++ b/src/plugins/auth-pam/README.auth-pam
@@ -0,0 +1,74 @@
+openvpn-auth-pam
+
+SYNOPSIS
+
+The openvpn-auth-pam module implements username/password
+authentication via PAM, and essentially allows any authentication
+method supported by PAM (such as LDAP, RADIUS, or Linux Shadow
+passwords) to be used with OpenVPN. While PAM supports
+username/password authentication, this can be combined with X509
+certificates to provide two indepedent levels of authentication.
+
+This module uses a split privilege execution model which will
+function even if you drop openvpn daemon privileges using the user,
+group, or chroot directives.
+
+BUILD
+
+To build openvpn-auth-pam, you will need to have the pam-devel
+package installed.
+
+Build with the "make" command. The module will be named
+openvpn-auth-pam.so
+
+USAGE
+
+To use this plugin module, add to your OpenVPN config file:
+
+ plugin openvpn-auth-pam.so service-type
+
+The required service-type parameter corresponds to
+the PAM service definition file usually found
+in /etc/pam.d.
+
+This plugin also supports the usage of a list of name/value
+pairs to answer PAM module queries.
+
+For example:
+
+ plugin openvpn-auth-pam.so "login login USERNAME password PASSWORD"
+
+tells auth-pam to (a) use the "login" PAM module, (b) answer a
+"login" query with the username given by the OpenVPN client, and
+(c) answer a "password" query with the password given by the
+OpenVPN client. This provides flexibility in dealing with the different
+types of query strings which different PAM modules might generate.
+For example, suppose you were using a PAM module called
+"test" which queried for "name" rather than "login":
+
+ plugin openvpn-auth-pam.so "test name USERNAME password PASSWORD"
+
+While "USERNAME" "COMMONNAME" and "PASSWORD" are special strings which substitute
+to client-supplied values, it is also possible to name literal values
+to use as PAM module query responses. For example, suppose that the
+login module queried for a third parameter, "domain" which
+is to be answered with the constant value "mydomain.com":
+
+ plugin openvpn-auth-pam.so "login login USERNAME password PASSWORD domain mydomain.com"
+
+The following OpenVPN directives can also influence
+the operation of this plugin:
+
+ client-cert-not-required
+ username-as-common-name
+
+Run OpenVPN with --verb 7 or higher to get debugging output from
+this plugin, including the list of queries presented by the
+underlying PAM module. This is a useful debugging tool to figure
+out which queries a given PAM module is making, so that you can
+craft the appropriate plugin directive to answer it.
+
+CAVEATS
+
+This module will only work on *nix systems which support PAM,
+not Windows.
diff --git a/src/plugins/auth-pam/auth-pam.c b/src/plugins/auth-pam/auth-pam.c
new file mode 100644
index 0000000..bd71792
--- /dev/null
+++ b/src/plugins/auth-pam/auth-pam.c
@@ -0,0 +1,806 @@
+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*
+ * OpenVPN plugin module to do PAM authentication using a split
+ * privilege model.
+ */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <security/pam_appl.h>
+
+#ifdef USE_PAM_DLOPEN
+#include "pamdl.h"
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <syslog.h>
+
+#include <openvpn-plugin.h>
+
+#define DEBUG(verb) ((verb) >= 4)
+
+/* Command codes for foreground -> background communication */
+#define COMMAND_VERIFY 0
+#define COMMAND_EXIT 1
+
+/* Response codes for background -> foreground communication */
+#define RESPONSE_INIT_SUCCEEDED 10
+#define RESPONSE_INIT_FAILED 11
+#define RESPONSE_VERIFY_SUCCEEDED 12
+#define RESPONSE_VERIFY_FAILED 13
+
+/*
+ * Plugin state, used by foreground
+ */
+struct auth_pam_context
+{
+ /* Foreground's socket to background process */
+ int foreground_fd;
+
+ /* Process ID of background process */
+ pid_t background_pid;
+
+ /* Verbosity level of OpenVPN */
+ int verb;
+};
+
+/*
+ * Name/Value pairs for conversation function.
+ * Special Values:
+ *
+ * "USERNAME" -- substitute client-supplied username
+ * "PASSWORD" -- substitute client-specified password
+ * "COMMONNAME" -- substitute client certificate common name
+ */
+
+#define N_NAME_VALUE 16
+
+struct name_value {
+ const char *name;
+ const char *value;
+};
+
+struct name_value_list {
+ int len;
+ struct name_value data[N_NAME_VALUE];
+};
+
+/*
+ * Used to pass the username/password
+ * to the PAM conversation function.
+ */
+struct user_pass {
+ int verb;
+
+ char username[128];
+ char password[128];
+ char common_name[128];
+
+ const struct name_value_list *name_value_list;
+};
+
+/* Background process function */
+static void pam_server (int fd, const char *service, int verb, const struct name_value_list *name_value_list);
+
+/* Read 'tosearch', replace all occurences of 'searchfor' with 'replacewith' and return
+ * a pointer to the NEW string. Does not modify the input strings. Will not enter an
+ * infinite loop with clever 'searchfor' and 'replacewith' strings.
+ * Daniel Johnson - Progman2000@usa.net / djohnson@progman.us
+ */
+static char *
+searchandreplace(const char *tosearch, const char *searchfor, const char *replacewith)
+{
+ const char *searching=tosearch;
+ char *scratch;
+ char temp[strlen(tosearch)*10];
+ temp[0]=0;
+
+ if (!tosearch || !searchfor || !replacewith) return 0;
+ if (!strlen(tosearch) || !strlen(searchfor) || !strlen(replacewith)) return 0;
+
+ scratch = strstr(searching,searchfor);
+ if (!scratch) return strdup(tosearch);
+
+ while (scratch) {
+ strncat(temp,searching,scratch-searching);
+ strcat(temp,replacewith);
+
+ searching=scratch+strlen(searchfor);
+ scratch = strstr(searching,searchfor);
+ }
+ return strdup(temp);
+}
+
+/*
+ * Given an environmental variable name, search
+ * the envp array for its value, returning it
+ * if found or NULL otherwise.
+ */
+static const char *
+get_env (const char *name, const char *envp[])
+{
+ if (envp)
+ {
+ int i;
+ const int namelen = strlen (name);
+ for (i = 0; envp[i]; ++i)
+ {
+ if (!strncmp (envp[i], name, namelen))
+ {
+ const char *cp = envp[i] + namelen;
+ if (*cp == '=')
+ return cp + 1;
+ }
+ }
+ }
+ return NULL;
+}
+
+/*
+ * Return the length of a string array
+ */
+static int
+string_array_len (const char *array[])
+{
+ int i = 0;
+ if (array)
+ {
+ while (array[i])
+ ++i;
+ }
+ return i;
+}
+
+/*
+ * Socket read/write functions.
+ */
+
+static int
+recv_control (int fd)
+{
+ unsigned char c;
+ const ssize_t size = read (fd, &c, sizeof (c));
+ if (size == sizeof (c))
+ return c;
+ else
+ {
+ /*fprintf (stderr, "AUTH-PAM: DEBUG recv_control.read=%d\n", (int)size);*/
+ return -1;
+ }
+}
+
+static int
+send_control (int fd, int code)
+{
+ unsigned char c = (unsigned char) code;
+ const ssize_t size = write (fd, &c, sizeof (c));
+ if (size == sizeof (c))
+ return (int) size;
+ else
+ return -1;
+}
+
+static int
+recv_string (int fd, char *buffer, int len)
+{
+ if (len > 0)
+ {
+ ssize_t size;
+ memset (buffer, 0, len);
+ size = read (fd, buffer, len);
+ buffer[len-1] = 0;
+ if (size >= 1)
+ return (int)size;
+ }
+ return -1;
+}
+
+static int
+send_string (int fd, const char *string)
+{
+ const int len = strlen (string) + 1;
+ const ssize_t size = write (fd, string, len);
+ if (size == len)
+ return (int) size;
+ else
+ return -1;
+}
+
+#ifdef DO_DAEMONIZE
+
+/*
+ * Daemonize if "daemon" env var is true.
+ * Preserve stderr across daemonization if
+ * "daemon_log_redirect" env var is true.
+ */
+static void
+daemonize (const char *envp[])
+{
+ const char *daemon_string = get_env ("daemon", envp);
+ if (daemon_string && daemon_string[0] == '1')
+ {
+ const char *log_redirect = get_env ("daemon_log_redirect", envp);
+ int fd = -1;
+ if (log_redirect && log_redirect[0] == '1')
+ fd = dup (2);
+ if (daemon (0, 0) < 0)
+ {
+ fprintf (stderr, "AUTH-PAM: daemonization failed\n");
+ }
+ else if (fd >= 3)
+ {
+ dup2 (fd, 2);
+ close (fd);
+ }
+ }
+}
+
+#endif
+
+/*
+ * Close most of parent's fds.
+ * Keep stdin/stdout/stderr, plus one
+ * other fd which is presumed to be
+ * our pipe back to parent.
+ * Admittedly, a bit of a kludge,
+ * but posix doesn't give us a kind
+ * of FD_CLOEXEC which will stop
+ * fds from crossing a fork().
+ */
+static void
+close_fds_except (int keep)
+{
+ int i;
+ closelog ();
+ for (i = 3; i <= 100; ++i)
+ {
+ if (i != keep)
+ close (i);
+ }
+}
+
+/*
+ * Usually we ignore signals, because our parent will
+ * deal with them.
+ */
+static void
+set_signals (void)
+{
+ signal (SIGTERM, SIG_DFL);
+
+ signal (SIGINT, SIG_IGN);
+ signal (SIGHUP, SIG_IGN);
+ signal (SIGUSR1, SIG_IGN);
+ signal (SIGUSR2, SIG_IGN);
+ signal (SIGPIPE, SIG_IGN);
+}
+
+/*
+ * Return 1 if query matches match.
+ */
+static int
+name_value_match (const char *query, const char *match)
+{
+ while (!isalnum (*query))
+ {
+ if (*query == '\0')
+ return 0;
+ ++query;
+ }
+ return strncasecmp (match, query, strlen (match)) == 0;
+}
+
+OPENVPN_EXPORT openvpn_plugin_handle_t
+openvpn_plugin_open_v1 (unsigned int *type_mask, const char *argv[], const char *envp[])
+{
+ pid_t pid;
+ int fd[2];
+
+ struct auth_pam_context *context;
+ struct name_value_list name_value_list;
+
+ const int base_parms = 2;
+
+ /*
+ * Allocate our context
+ */
+ context = (struct auth_pam_context *) calloc (1, sizeof (struct auth_pam_context));
+ if (!context)
+ goto error;
+ context->foreground_fd = -1;
+
+ /*
+ * Intercept the --auth-user-pass-verify callback.
+ */
+ *type_mask = OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY);
+
+ /*
+ * Make sure we have two string arguments: the first is the .so name,
+ * the second is the PAM service type.
+ */
+ if (string_array_len (argv) < base_parms)
+ {
+ fprintf (stderr, "AUTH-PAM: need PAM service parameter\n");
+ goto error;
+ }
+
+ /*
+ * See if we have optional name/value pairs to match against
+ * PAM module queried fields in the conversation function.
+ */
+ name_value_list.len = 0;
+ if (string_array_len (argv) > base_parms)
+ {
+ const int nv_len = string_array_len (argv) - base_parms;
+ int i;
+
+ if ((nv_len & 1) == 1 || (nv_len / 2) > N_NAME_VALUE)
+ {
+ fprintf (stderr, "AUTH-PAM: bad name/value list length\n");
+ goto error;
+ }
+
+ name_value_list.len = nv_len / 2;
+ for (i = 0; i < name_value_list.len; ++i)
+ {
+ const int base = base_parms + i * 2;
+ name_value_list.data[i].name = argv[base];
+ name_value_list.data[i].value = argv[base+1];
+ }
+ }
+
+ /*
+ * Get verbosity level from environment
+ */
+ {
+ const char *verb_string = get_env ("verb", envp);
+ if (verb_string)
+ context->verb = atoi (verb_string);
+ }
+
+ /*
+ * Make a socket for foreground and background processes
+ * to communicate.
+ */
+ if (socketpair (PF_UNIX, SOCK_DGRAM, 0, fd) == -1)
+ {
+ fprintf (stderr, "AUTH-PAM: socketpair call failed\n");
+ goto error;
+ }
+
+ /*
+ * Fork off the privileged process. It will remain privileged
+ * even after the foreground process drops its privileges.
+ */
+ pid = fork ();
+
+ if (pid)
+ {
+ int status;
+
+ /*
+ * Foreground Process
+ */
+
+ context->background_pid = pid;
+
+ /* close our copy of child's socket */
+ close (fd[1]);
+
+ /* don't let future subprocesses inherit child socket */
+ if (fcntl (fd[0], F_SETFD, FD_CLOEXEC) < 0)
+ fprintf (stderr, "AUTH-PAM: Set FD_CLOEXEC flag on socket file descriptor failed\n");
+
+ /* wait for background child process to initialize */
+ status = recv_control (fd[0]);
+ if (status == RESPONSE_INIT_SUCCEEDED)
+ {
+ context->foreground_fd = fd[0];
+ return (openvpn_plugin_handle_t) context;
+ }
+ }
+ else
+ {
+ /*
+ * Background Process
+ */
+
+ /* close all parent fds except our socket back to parent */
+ close_fds_except (fd[1]);
+
+ /* Ignore most signals (the parent will receive them) */
+ set_signals ();
+
+#ifdef DO_DAEMONIZE
+ /* Daemonize if --daemon option is set. */
+ daemonize (envp);
+#endif
+
+ /* execute the event loop */
+ pam_server (fd[1], argv[1], context->verb, &name_value_list);
+
+ close (fd[1]);
+
+ exit (0);
+ return 0; /* NOTREACHED */
+ }
+
+ error:
+ if (context)
+ free (context);
+ return NULL;
+}
+
+OPENVPN_EXPORT int
+openvpn_plugin_func_v1 (openvpn_plugin_handle_t handle, const int type, const char *argv[], const char *envp[])
+{
+ struct auth_pam_context *context = (struct auth_pam_context *) handle;
+
+ if (type == OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY && context->foreground_fd >= 0)
+ {
+ /* get username/password from envp string array */
+ const char *username = get_env ("username", envp);
+ const char *password = get_env ("password", envp);
+ const char *common_name = get_env ("common_name", envp) ? get_env ("common_name", envp) : "";
+
+ if (username && strlen (username) > 0 && password)
+ {
+ if (send_control (context->foreground_fd, COMMAND_VERIFY) == -1
+ || send_string (context->foreground_fd, username) == -1
+ || send_string (context->foreground_fd, password) == -1
+ || send_string (context->foreground_fd, common_name) == -1)
+ {
+ fprintf (stderr, "AUTH-PAM: Error sending auth info to background process\n");
+ }
+ else
+ {
+ const int status = recv_control (context->foreground_fd);
+ if (status == RESPONSE_VERIFY_SUCCEEDED)
+ return OPENVPN_PLUGIN_FUNC_SUCCESS;
+ if (status == -1)
+ fprintf (stderr, "AUTH-PAM: Error receiving auth confirmation from background process\n");
+ }
+ }
+ }
+ return OPENVPN_PLUGIN_FUNC_ERROR;
+}
+
+OPENVPN_EXPORT void
+openvpn_plugin_close_v1 (openvpn_plugin_handle_t handle)
+{
+ struct auth_pam_context *context = (struct auth_pam_context *) handle;
+
+ if (DEBUG (context->verb))
+ fprintf (stderr, "AUTH-PAM: close\n");
+
+ if (context->foreground_fd >= 0)
+ {
+ /* tell background process to exit */
+ if (send_control (context->foreground_fd, COMMAND_EXIT) == -1)
+ fprintf (stderr, "AUTH-PAM: Error signaling background process to exit\n");
+
+ /* wait for background process to exit */
+ if (context->background_pid > 0)
+ waitpid (context->background_pid, NULL, 0);
+
+ close (context->foreground_fd);
+ context->foreground_fd = -1;
+ }
+
+ free (context);
+}
+
+OPENVPN_EXPORT void
+openvpn_plugin_abort_v1 (openvpn_plugin_handle_t handle)
+{
+ struct auth_pam_context *context = (struct auth_pam_context *) handle;
+
+ /* tell background process to exit */
+ if (context && context->foreground_fd >= 0)
+ {
+ send_control (context->foreground_fd, COMMAND_EXIT);
+ close (context->foreground_fd);
+ context->foreground_fd = -1;
+ }
+}
+
+/*
+ * PAM conversation function
+ */
+static int
+my_conv (int n, const struct pam_message **msg_array,
+ struct pam_response **response_array, void *appdata_ptr)
+{
+ const struct user_pass *up = ( const struct user_pass *) appdata_ptr;
+ struct pam_response *aresp;
+ int i;
+ int ret = PAM_SUCCESS;
+
+ *response_array = NULL;
+
+ if (n <= 0 || n > PAM_MAX_NUM_MSG)
+ return (PAM_CONV_ERR);
+ if ((aresp = calloc (n, sizeof *aresp)) == NULL)
+ return (PAM_BUF_ERR);
+
+ /* loop through each PAM-module query */
+ for (i = 0; i < n; ++i)
+ {
+ const struct pam_message *msg = msg_array[i];
+ aresp[i].resp_retcode = 0;
+ aresp[i].resp = NULL;
+
+ if (DEBUG (up->verb))
+ {
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: my_conv[%d] query='%s' style=%d\n",
+ i,
+ msg->msg ? msg->msg : "NULL",
+ msg->msg_style);
+ }
+
+ if (up->name_value_list && up->name_value_list->len > 0)
+ {
+ /* use name/value list match method */
+ const struct name_value_list *list = up->name_value_list;
+ int j;
+
+ /* loop through name/value pairs */
+ for (j = 0; j < list->len; ++j)
+ {
+ const char *match_name = list->data[j].name;
+ const char *match_value = list->data[j].value;
+
+ if (name_value_match (msg->msg, match_name))
+ {
+ /* found name/value match */
+ aresp[i].resp = NULL;
+
+ if (DEBUG (up->verb))
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: name match found, query/match-string ['%s', '%s'] = '%s'\n",
+ msg->msg,
+ match_name,
+ match_value);
+
+ if (strstr(match_value, "USERNAME"))
+ aresp[i].resp = searchandreplace(match_value, "USERNAME", up->username);
+ else if (strstr(match_value, "PASSWORD"))
+ aresp[i].resp = searchandreplace(match_value, "PASSWORD", up->password);
+ else if (strstr(match_value, "COMMONNAME"))
+ aresp[i].resp = searchandreplace(match_value, "COMMONNAME", up->common_name);
+ else
+ aresp[i].resp = strdup (match_value);
+
+ if (aresp[i].resp == NULL)
+ ret = PAM_CONV_ERR;
+ break;
+ }
+ }
+
+ if (j == list->len)
+ ret = PAM_CONV_ERR;
+ }
+ else
+ {
+ /* use PAM_PROMPT_ECHO_x hints */
+ switch (msg->msg_style)
+ {
+ case PAM_PROMPT_ECHO_OFF:
+ aresp[i].resp = strdup (up->password);
+ if (aresp[i].resp == NULL)
+ ret = PAM_CONV_ERR;
+ break;
+
+ case PAM_PROMPT_ECHO_ON:
+ aresp[i].resp = strdup (up->username);
+ if (aresp[i].resp == NULL)
+ ret = PAM_CONV_ERR;
+ break;
+
+ case PAM_ERROR_MSG:
+ case PAM_TEXT_INFO:
+ break;
+
+ default:
+ ret = PAM_CONV_ERR;
+ break;
+ }
+ }
+ }
+
+ if (ret == PAM_SUCCESS)
+ *response_array = aresp;
+ return ret;
+}
+
+/*
+ * Return 1 if authenticated and 0 if failed.
+ * Called once for every username/password
+ * to be authenticated.
+ */
+static int
+pam_auth (const char *service, const struct user_pass *up)
+{
+ struct pam_conv conv;
+ pam_handle_t *pamh = NULL;
+ int status = PAM_SUCCESS;
+ int ret = 0;
+ const int name_value_list_provided = (up->name_value_list && up->name_value_list->len > 0);
+
+ /* Initialize PAM */
+ conv.conv = my_conv;
+ conv.appdata_ptr = (void *)up;
+ status = pam_start (service, name_value_list_provided ? NULL : up->username, &conv, &pamh);
+ if (status == PAM_SUCCESS)
+ {
+ /* Call PAM to verify username/password */
+ status = pam_authenticate(pamh, 0);
+ if (status == PAM_SUCCESS)
+ status = pam_acct_mgmt (pamh, 0);
+ if (status == PAM_SUCCESS)
+ ret = 1;
+
+ /* Output error message if failed */
+ if (!ret)
+ {
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: user '%s' failed to authenticate: %s\n",
+ up->username,
+ pam_strerror (pamh, status));
+ }
+
+ /* Close PAM */
+ pam_end (pamh, status);
+ }
+
+ return ret;
+}
+
+/*
+ * Background process -- runs with privilege.
+ */
+static void
+pam_server (int fd, const char *service, int verb, const struct name_value_list *name_value_list)
+{
+ struct user_pass up;
+ int command;
+#ifdef USE_PAM_DLOPEN
+ static const char pam_so[] = "libpam.so";
+#endif
+
+ /*
+ * Do initialization
+ */
+ if (DEBUG (verb))
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: INIT service='%s'\n", service);
+
+#ifdef USE_PAM_DLOPEN
+ /*
+ * Load PAM shared object
+ */
+ if (!dlopen_pam (pam_so))
+ {
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: could not load PAM lib %s: %s\n", pam_so, dlerror());
+ send_control (fd, RESPONSE_INIT_FAILED);
+ goto done;
+ }
+#endif
+
+ /*
+ * Tell foreground that we initialized successfully
+ */
+ if (send_control (fd, RESPONSE_INIT_SUCCEEDED) == -1)
+ {
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: write error on response socket [1]\n");
+ goto done;
+ }
+
+ /*
+ * Event loop
+ */
+ while (1)
+ {
+ memset (&up, 0, sizeof (up));
+ up.verb = verb;
+ up.name_value_list = name_value_list;
+
+ /* get a command from foreground process */
+ command = recv_control (fd);
+
+ if (DEBUG (verb))
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: received command code: %d\n", command);
+
+ switch (command)
+ {
+ case COMMAND_VERIFY:
+ if (recv_string (fd, up.username, sizeof (up.username)) == -1
+ || recv_string (fd, up.password, sizeof (up.password)) == -1
+ || recv_string (fd, up.common_name, sizeof (up.common_name)) == -1)
+ {
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: read error on command channel: code=%d, exiting\n",
+ command);
+ goto done;
+ }
+
+ if (DEBUG (verb))
+ {
+#if 0
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: USER/PASS: %s/%s\n",
+ up.username, up.password);
+#else
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: USER: %s\n", up.username);
+#endif
+ }
+
+ if (pam_auth (service, &up)) /* Succeeded */
+ {
+ if (send_control (fd, RESPONSE_VERIFY_SUCCEEDED) == -1)
+ {
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: write error on response socket [2]\n");
+ goto done;
+ }
+ }
+ else /* Failed */
+ {
+ if (send_control (fd, RESPONSE_VERIFY_FAILED) == -1)
+ {
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: write error on response socket [3]\n");
+ goto done;
+ }
+ }
+ break;
+
+ case COMMAND_EXIT:
+ goto done;
+
+ case -1:
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: read error on command channel\n");
+ goto done;
+
+ default:
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: unknown command code: code=%d, exiting\n",
+ command);
+ goto done;
+ }
+ }
+ done:
+
+#ifdef USE_PAM_DLOPEN
+ dlclose_pam ();
+#endif
+ if (DEBUG (verb))
+ fprintf (stderr, "AUTH-PAM: BACKGROUND: EXIT\n");
+
+ return;
+}
diff --git a/src/plugins/auth-pam/auth-pam.exports b/src/plugins/auth-pam/auth-pam.exports
new file mode 100644
index 0000000..b07937c
--- /dev/null
+++ b/src/plugins/auth-pam/auth-pam.exports
@@ -0,0 +1,4 @@
+openvpn_plugin_open_v1
+openvpn_plugin_func_v1
+openvpn_plugin_close_v1
+openvpn_plugin_abort_v1
diff --git a/src/plugins/auth-pam/pamdl.c b/src/plugins/auth-pam/pamdl.c
new file mode 100644
index 0000000..26e9821
--- /dev/null
+++ b/src/plugins/auth-pam/pamdl.c
@@ -0,0 +1,184 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifdef USE_PAM_DLOPEN
+/*
+ * If you want to dynamically load libpam using dlopen() or something,
+ * then dlopen( ' this shared object ' ); It takes care of exporting
+ * the right symbols to any modules loaded by libpam.
+ *
+ * Modified by JY for use with openvpn-pam-auth
+ */
+
+#include <stdio.h>
+#include <dlfcn.h>
+#include <security/pam_appl.h>
+
+#include "pamdl.h"
+
+static void *libpam_h = NULL;
+
+#define RESOLVE_PAM_FUNCTION(x, y, z, err) \
+ { \
+ union { const void *tpointer; y (*fn) z ; } fptr; \
+ fptr.tpointer = dlsym(libpam_h, #x); real_##x = fptr.fn; \
+ if (real_##x == NULL) { \
+ fprintf (stderr, "PAMDL: unable to resolve '%s': %s\n", #x, dlerror()); \
+ return err; \
+ } \
+ }
+
+int
+dlopen_pam (const char *so)
+{
+ if (libpam_h == NULL)
+ {
+ libpam_h = dlopen(so, RTLD_GLOBAL|RTLD_NOW);
+ }
+ return libpam_h != NULL;
+}
+
+void
+dlclose_pam (void)
+{
+ if (libpam_h != NULL)
+ {
+ dlclose(libpam_h);
+ libpam_h = NULL;
+ }
+}
+
+int pam_start(const char *service_name, const char *user,
+ const struct pam_conv *pam_conversation,
+ pam_handle_t **pamh)
+{
+ int (*real_pam_start)(const char *, const char *,
+ const struct pam_conv *,
+ pam_handle_t **);
+ RESOLVE_PAM_FUNCTION(pam_start, int, (const char *, const char *,
+ const struct pam_conv *,
+ pam_handle_t **), PAM_ABORT);
+ return real_pam_start(service_name, user, pam_conversation, pamh);
+}
+
+int pam_end(pam_handle_t *pamh, int pam_status)
+{
+ int (*real_pam_end)(pam_handle_t *, int);
+ RESOLVE_PAM_FUNCTION(pam_end, int, (pam_handle_t *, int), PAM_ABORT);
+ return real_pam_end(pamh, pam_status);
+}
+
+int pam_set_item(pam_handle_t *pamh, int item_type, const void *item)
+{
+ int (*real_pam_set_item)(pam_handle_t *, int, const void *);
+ RESOLVE_PAM_FUNCTION(pam_set_item, int,
+ (pam_handle_t *, int, const void *), PAM_ABORT);
+ return real_pam_set_item(pamh, item_type, item);
+}
+
+int pam_get_item(const pam_handle_t *pamh, int item_type, const void **item)
+{
+ int (*real_pam_get_item)(const pam_handle_t *, int, const void **);
+ RESOLVE_PAM_FUNCTION(pam_get_item, int,
+ (const pam_handle_t *, int, const void **),
+ PAM_ABORT);
+ return real_pam_get_item(pamh, item_type, item);
+}
+
+int pam_fail_delay(pam_handle_t *pamh, unsigned int musec_delay)
+{
+ int (*real_pam_fail_delay)(pam_handle_t *, unsigned int);
+ RESOLVE_PAM_FUNCTION(pam_fail_delay, int, (pam_handle_t *, unsigned int),
+ PAM_ABORT);
+ return real_pam_fail_delay(pamh, musec_delay);
+}
+
+typedef const char * const_char_pointer;
+
+const_char_pointer pam_strerror(pam_handle_t *pamh, int errnum)
+{
+ const_char_pointer (*real_pam_strerror)(pam_handle_t *, int);
+ RESOLVE_PAM_FUNCTION(pam_strerror, const_char_pointer,
+ (pam_handle_t *, int), NULL);
+ return real_pam_strerror(pamh, errnum);
+}
+
+int pam_putenv(pam_handle_t *pamh, const char *name_value)
+{
+ int (*real_pam_putenv)(pam_handle_t *, const char *);
+ RESOLVE_PAM_FUNCTION(pam_putenv, int, (pam_handle_t *, const char *),
+ PAM_ABORT);
+ return real_pam_putenv(pamh, name_value);
+}
+
+const_char_pointer pam_getenv(pam_handle_t *pamh, const char *name)
+{
+ const_char_pointer (*real_pam_getenv)(pam_handle_t *, const char *);
+ RESOLVE_PAM_FUNCTION(pam_getenv, const_char_pointer,
+ (pam_handle_t *, const char *), NULL);
+ return real_pam_getenv(pamh, name);
+}
+
+typedef char ** char_ppointer;
+char_ppointer pam_getenvlist(pam_handle_t *pamh)
+{
+ char_ppointer (*real_pam_getenvlist)(pam_handle_t *);
+ RESOLVE_PAM_FUNCTION(pam_getenvlist, char_ppointer, (pam_handle_t *),
+ NULL);
+ return real_pam_getenvlist(pamh);
+}
+
+/* Authentication management */
+
+int pam_authenticate(pam_handle_t *pamh, int flags)
+{
+ int (*real_pam_authenticate)(pam_handle_t *, int);
+ RESOLVE_PAM_FUNCTION(pam_authenticate, int, (pam_handle_t *, int),
+ PAM_ABORT);
+ return real_pam_authenticate(pamh, flags);
+}
+
+int pam_setcred(pam_handle_t *pamh, int flags)
+{
+ int (*real_pam_setcred)(pam_handle_t *, int);
+ RESOLVE_PAM_FUNCTION(pam_setcred, int, (pam_handle_t *, int), PAM_ABORT);
+ return real_pam_setcred(pamh, flags);
+}
+
+/* Account Management API's */
+
+int pam_acct_mgmt(pam_handle_t *pamh, int flags)
+{
+ int (*real_pam_acct_mgmt)(pam_handle_t *, int);
+ RESOLVE_PAM_FUNCTION(pam_acct_mgmt, int, (pam_handle_t *, int), PAM_ABORT);
+ return real_pam_acct_mgmt(pamh, flags);
+}
+
+/* Session Management API's */
+
+int pam_open_session(pam_handle_t *pamh, int flags)
+{
+ int (*real_pam_open_session)(pam_handle_t *, int);
+ RESOLVE_PAM_FUNCTION(pam_open_session, int, (pam_handle_t *, int),
+ PAM_ABORT);
+ return real_pam_open_session(pamh, flags);
+}
+
+int pam_close_session(pam_handle_t *pamh, int flags)
+{
+ int (*real_pam_close_session)(pam_handle_t *, int);
+ RESOLVE_PAM_FUNCTION(pam_close_session, int, (pam_handle_t *, int),
+ PAM_ABORT);
+ return real_pam_close_session(pamh, flags);
+}
+
+/* Password Management API's */
+
+int pam_chauthtok(pam_handle_t *pamh, int flags)
+{
+ int (*real_pam_chauthtok)(pam_handle_t *, int);
+ RESOLVE_PAM_FUNCTION(pam_chauthtok, int, (pam_handle_t *, int), PAM_ABORT);
+ return real_pam_chauthtok(pamh, flags);
+}
+#endif
diff --git a/src/plugins/auth-pam/pamdl.h b/src/plugins/auth-pam/pamdl.h
new file mode 100644
index 0000000..12ba068
--- /dev/null
+++ b/src/plugins/auth-pam/pamdl.h
@@ -0,0 +1,5 @@
+#ifdef USE_PAM_DLOPEN
+/* Dynamically load and unload the PAM library */
+int dlopen_pam (const char *so);
+void dlclose_pam (void);
+#endif