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-rw-r--r--examples/Makefile.am14
-rw-r--r--examples/Makefile.in686
-rw-r--r--examples/README12
-rw-r--r--examples/blank.c158
-rw-r--r--examples/check_user.c60
-rw-r--r--examples/vpass.c49
-rw-r--r--examples/xsh.c173
7 files changed, 1152 insertions, 0 deletions
diff --git a/examples/Makefile.am b/examples/Makefile.am
new file mode 100644
index 0000000..ebec86d
--- /dev/null
+++ b/examples/Makefile.am
@@ -0,0 +1,14 @@
+#
+# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de>
+#
+
+CLEANFILES = *~
+
+EXTRA_DIST = README
+
+AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \
+ -I$(top_srcdir)/libpam_misc/include
+LDADD = $(top_builddir)/libpam/libpam.la \
+ $(top_builddir)/libpam_misc/libpam_misc.la
+
+noinst_PROGRAMS = xsh vpass blank check_user
diff --git a/examples/Makefile.in b/examples/Makefile.in
new file mode 100644
index 0000000..9c24f09
--- /dev/null
+++ b/examples/Makefile.in
@@ -0,0 +1,686 @@
+# Makefile.in generated by automake 1.13.4 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2013 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+#
+# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de>
+#
+
+VPATH = @srcdir@
+am__is_gnu_make = test -n '$(MAKEFILE_LIST)' && test -n '$(MAKELEVEL)'
+am__make_running_with_option = \
+ case $${target_option-} in \
+ ?) ;; \
+ *) echo "am__make_running_with_option: internal error: invalid" \
+ "target option '$${target_option-}' specified" >&2; \
+ exit 1;; \
+ esac; \
+ has_opt=no; \
+ sane_makeflags=$$MAKEFLAGS; \
+ if $(am__is_gnu_make); then \
+ sane_makeflags=$$MFLAGS; \
+ else \
+ case $$MAKEFLAGS in \
+ *\\[\ \ ]*) \
+ bs=\\; \
+ sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+ | sed "s/$$bs$$bs[$$bs $$bs ]*//g"`;; \
+ esac; \
+ fi; \
+ skip_next=no; \
+ strip_trailopt () \
+ { \
+ flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+ }; \
+ for flg in $$sane_makeflags; do \
+ test $$skip_next = yes && { skip_next=no; continue; }; \
+ case $$flg in \
+ *=*|--*) continue;; \
+ -*I) strip_trailopt 'I'; skip_next=yes;; \
+ -*I?*) strip_trailopt 'I';; \
+ -*O) strip_trailopt 'O'; skip_next=yes;; \
+ -*O?*) strip_trailopt 'O';; \
+ -*l) strip_trailopt 'l'; skip_next=yes;; \
+ -*l?*) strip_trailopt 'l';; \
+ -[dEDm]) skip_next=yes;; \
+ -[JT]) skip_next=yes;; \
+ esac; \
+ case $$flg in \
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+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
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+host_triplet = @host@
+noinst_PROGRAMS = xsh$(EXEEXT) vpass$(EXEEXT) blank$(EXEEXT) \
+ check_user$(EXEEXT)
+subdir = examples
+DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/Makefile.am \
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+CONFIG_CLEAN_FILES =
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+blank_SOURCES = blank.c
+blank_OBJECTS = blank.$(OBJEXT)
+blank_LDADD = $(LDADD)
+blank_DEPENDENCIES = $(top_builddir)/libpam/libpam.la \
+ $(top_builddir)/libpam_misc/libpam_misc.la
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+ $(top_builddir)/libpam_misc/libpam_misc.la
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+ $(top_builddir)/libpam_misc/libpam_misc.la
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+ $(top_builddir)/libpam_misc/libpam_misc.la
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+
+ID: $(am__tagged_files)
+ $(am__define_uniq_tagged_files); mkid -fID $$unique
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+GTAGS:
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+ && gtags -i $(GTAGS_ARGS) "$$here"
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+ if test -f "$$i"; then \
+ echo "$(subdir)/$$i"; \
+ else \
+ echo "$$sdir/$$i"; \
+ fi; \
+ done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+ -rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(DISTFILES)
+ @srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
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+ sed -e "s|^$$srcdirstrip/||;t" \
+ -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
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+ sort -u` ;; \
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+ if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+ find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
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+ if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+ test -f "$(distdir)/$$file" \
+ || cp -p $$d/$$file "$(distdir)/$$file" \
+ || exit 1; \
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+mostlyclean-generic:
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+clean-generic:
+ -test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
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+ ctags-am distclean distclean-compile distclean-generic \
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+# 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/examples/README b/examples/README
new file mode 100644
index 0000000..fee734d
--- /dev/null
+++ b/examples/README
@@ -0,0 +1,12 @@
+
+(now we are getting networked apps, be careful to try and test on a
+securely isolated system!)
+
+These programs grant no privileges, but they give an idea of how well
+the modules are working.
+
+blank is new as of Linux-PAM-0.21. If you are writing/modifying an
+application it might be a place to start...
+
+xsh is new as of Linux-PAM-0.31, it is identical to blank, but invokes
+/bin/sh if the user is authenticated.
diff --git a/examples/blank.c b/examples/blank.c
new file mode 100644
index 0000000..8210013
--- /dev/null
+++ b/examples/blank.c
@@ -0,0 +1,158 @@
+/*
+ * $Id$
+ */
+
+/* Andrew Morgan (morgan@parc.power.net) -- a self contained `blank'
+ * application
+ *
+ * I am not very proud of this code. It makes use of a possibly ill-
+ * defined pamh pointer to call pam_strerror() with. The reason that
+ * I was sloppy with this is historical (pam_strerror, prior to 0.59,
+ * did not require a pamh argument) and if this program is used as a
+ * model for anything, I should wish that you will take this error into
+ * account.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <security/pam_appl.h>
+#include <security/pam_misc.h>
+
+/* ------ some local (static) functions ------- */
+
+static void bail_out(pam_handle_t *pamh, int really, int code, const char *fn)
+{
+ fprintf(stderr,"==> called %s()\n got: `%s'\n", fn,
+ pam_strerror(pamh, code));
+ if (really && code)
+ exit (1);
+}
+
+/* ------ some static data objects ------- */
+
+static struct pam_conv conv = {
+ misc_conv,
+ NULL
+};
+
+/* ------- the application itself -------- */
+
+int main(int argc, char **argv)
+{
+ pam_handle_t *pamh=NULL;
+ char *username=NULL;
+ int retcode;
+
+ /* did the user call with a username as an argument ? */
+
+ if (argc > 2) {
+ fprintf(stderr,"usage: %s [username]\n",argv[0]);
+ } else if (argc == 2) {
+ username = argv[1];
+ }
+
+ /* initialize the Linux-PAM library */
+ retcode = pam_start("blank", username, &conv, &pamh);
+ bail_out(pamh,1,retcode,"pam_start");
+
+ /* test the environment stuff */
+ {
+#define MAXENV 15
+ const char *greek[MAXENV] = {
+ "a=alpha", "b=beta", "c=gamma", "d=delta", "e=epsilon",
+ "f=phi", "g=psi", "h=eta", "i=iota", "j=mu", "k=nu",
+ "l=zeta", "h=", "d", "k=xi"
+ };
+ char **env;
+ int i;
+
+ for (i=0; i<MAXENV; ++i) {
+ retcode = pam_putenv(pamh,greek[i]);
+ bail_out(pamh,0,retcode,"pam_putenv");
+ }
+ env = pam_getenvlist(pamh);
+ if (env)
+ env = pam_misc_drop_env(env);
+ else
+ fprintf(stderr,"???\n");
+ fprintf(stderr,"a test: c=[%s], j=[%s]\n"
+ , pam_getenv(pamh, "c"), pam_getenv(pamh, "j"));
+ }
+
+ /* to avoid using goto we abuse a loop here */
+ for (;;) {
+ /* authenticate the user --- `0' here, could have been PAM_SILENT
+ * | PAM_DISALLOW_NULL_AUTHTOK */
+
+ retcode = pam_authenticate(pamh, 0);
+ bail_out(pamh,0,retcode,"pam_authenticate");
+
+ /* has the user proved themself valid? */
+ if (retcode != PAM_SUCCESS) {
+ fprintf(stderr,"%s: invalid request\n",argv[0]);
+ break;
+ }
+
+ /* the user is valid, but should they have access at this
+ time? */
+
+ retcode = pam_acct_mgmt(pamh, 0); /* `0' could be as above */
+ bail_out(pamh,0,retcode,"pam_acct_mgmt");
+
+ if (retcode == PAM_NEW_AUTHTOK_REQD) {
+ fprintf(stderr,"Application must request new password...\n");
+ retcode = pam_chauthtok(pamh,PAM_CHANGE_EXPIRED_AUTHTOK);
+ bail_out(pamh,0,retcode,"pam_chauthtok");
+ }
+
+ if (retcode != PAM_SUCCESS) {
+ fprintf(stderr,"%s: invalid request\n",argv[0]);
+ break;
+ }
+
+ /* `0' could be as above */
+ retcode = pam_setcred(pamh, PAM_ESTABLISH_CRED);
+ bail_out(pamh,0,retcode,"pam_setcred1");
+
+ if (retcode != PAM_SUCCESS) {
+ fprintf(stderr,"%s: problem setting user credentials\n"
+ ,argv[0]);
+ break;
+ }
+
+ /* open a session for the user --- `0' could be PAM_SILENT */
+ retcode = pam_open_session(pamh,0);
+ bail_out(pamh,0,retcode,"pam_open_session");
+ if (retcode != PAM_SUCCESS) {
+ fprintf(stderr,"%s: problem opening a session\n",argv[0]);
+ break;
+ }
+
+ fprintf(stderr,"The user has been authenticated and `logged in'\n");
+
+ /* close a session for the user --- `0' could be PAM_SILENT
+ * it is possible that this pam_close_call is in another program..
+ */
+
+ retcode = pam_close_session(pamh,0);
+ bail_out(pamh,0,retcode,"pam_close_session");
+ if (retcode != PAM_SUCCESS) {
+ fprintf(stderr,"%s: problem closing a session\n",argv[0]);
+ break;
+ }
+
+ retcode = pam_setcred(pamh, PAM_DELETE_CRED);
+ bail_out(pamh,0,retcode,"pam_setcred2");
+
+ break; /* don't go on for ever! */
+ }
+
+ /* close the Linux-PAM library */
+ retcode = pam_end(pamh, PAM_SUCCESS);
+ pamh = NULL;
+
+ bail_out(pamh,1,retcode,"pam_end");
+
+ exit(0);
+}
diff --git a/examples/check_user.c b/examples/check_user.c
new file mode 100644
index 0000000..89cc137
--- /dev/null
+++ b/examples/check_user.c
@@ -0,0 +1,60 @@
+/*
+ $Id$
+
+ This program was contributed by Shane Watts <shane@icarus.bofh.asn.au>
+ slight modifications by AGM.
+
+ You need to add the following (or equivalent) to the /etc/pam.conf file.
+ # check authorization
+ check auth required pam_unix_auth.so
+ check account required pam_unix_acct.so
+*/
+
+#include <security/pam_appl.h>
+#include <security/pam_misc.h>
+#include <stdio.h>
+
+static struct pam_conv conv = {
+ misc_conv,
+ NULL
+};
+
+int main(int argc, char *argv[])
+{
+ pam_handle_t *pamh=NULL;
+ int retval;
+ const char *user="nobody";
+
+ if(argc == 2) {
+ user = argv[1];
+ }
+
+ if(argc > 2) {
+ fprintf(stderr, "Usage: check_user [username]\n");
+ exit(1);
+ }
+
+ retval = pam_start("check", user, &conv, &pamh);
+
+ if (retval == PAM_SUCCESS)
+ retval = pam_authenticate(pamh, 0); /* is user really user? */
+
+ if (retval == PAM_SUCCESS)
+ retval = pam_acct_mgmt(pamh, 0); /* permitted access? */
+
+ /* This is where we have been authorized or not. */
+
+ if (retval == PAM_SUCCESS) {
+ fprintf(stdout, "Authenticated\n");
+ } else {
+ fprintf(stdout, "Not Authenticated\n");
+ }
+
+ if (pam_end(pamh,retval) != PAM_SUCCESS) { /* close Linux-PAM */
+ pamh = NULL;
+ fprintf(stderr, "check_user: failed to release authenticator\n");
+ exit(1);
+ }
+
+ return ( retval == PAM_SUCCESS ? 0:1 ); /* indicate success */
+}
diff --git a/examples/vpass.c b/examples/vpass.c
new file mode 100644
index 0000000..f73b361
--- /dev/null
+++ b/examples/vpass.c
@@ -0,0 +1,49 @@
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <sys/types.h>
+#include <security/pam_appl.h>
+
+static int
+test_conv (int num_msg UNUSED, const struct pam_message **msgm UNUSED,
+ struct pam_response **response UNUSED, void *appdata_ptr UNUSED)
+{
+ return 0;
+}
+
+static struct pam_conv conv = {
+ test_conv,
+ NULL
+};
+
+int main(void)
+{
+ char *user;
+ pam_handle_t *pamh;
+ struct passwd *pw;
+ uid_t uid;
+ int res;
+
+ uid = geteuid();
+ pw = getpwuid(uid);
+ if (pw) {
+ user = pw->pw_name;
+ } else {
+ fprintf(stderr, "Invalid userid: %lu\n", (unsigned long) uid);
+ exit(1);
+ }
+
+ pam_start("vpass", user, &conv, &pamh);
+ pam_set_item(pamh, PAM_TTY, "/dev/tty");
+ if ((res = pam_authenticate(pamh, 0)) != PAM_SUCCESS) {
+ fprintf(stderr, "Oops: %s\n", pam_strerror(pamh, res));
+ exit(1);
+ }
+
+ pam_end(pamh, res);
+ exit(0);
+}
diff --git a/examples/xsh.c b/examples/xsh.c
new file mode 100644
index 0000000..ef4dca0
--- /dev/null
+++ b/examples/xsh.c
@@ -0,0 +1,173 @@
+/* Andrew Morgan (morgan@kernel.org) -- an example application
+ * that invokes a shell, based on blank.c */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <security/pam_appl.h>
+#include <security/pam_misc.h>
+
+#include <pwd.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+/* ------ some local (static) functions ------- */
+
+static void bail_out(pam_handle_t *pamh,int really, int code, const char *fn)
+{
+ fprintf(stderr,"==> called %s()\n got: `%s'\n", fn,
+ pam_strerror(pamh,code));
+ if (really && code)
+ exit (1);
+}
+
+/* ------ some static data objects ------- */
+
+static struct pam_conv conv = {
+ misc_conv,
+ NULL
+};
+
+/* ------- the application itself -------- */
+
+int main(int argc, char **argv)
+{
+ pam_handle_t *pamh=NULL;
+ const void *username=NULL;
+ const char *service="xsh";
+ int retcode;
+
+ /* did the user call with a username as an argument ?
+ * did they also */
+
+ if (argc > 3) {
+ fprintf(stderr,"usage: %s [username [service-name]]\n",argv[0]);
+ }
+ if ((argc >= 2) && (argv[1][0] != '-')) {
+ username = argv[1];
+ }
+ if (argc == 3) {
+ service = argv[2];
+ }
+
+ /* initialize the Linux-PAM library */
+ retcode = pam_start(service, username, &conv, &pamh);
+ bail_out(pamh,1,retcode,"pam_start");
+
+ /* fill in the RUSER and RHOST etc. fields */
+ {
+ char buffer[100];
+ struct passwd *pw;
+ const char *tty;
+
+ pw = getpwuid(getuid());
+ if (pw != NULL) {
+ retcode = pam_set_item(pamh, PAM_RUSER, pw->pw_name);
+ bail_out(pamh,1,retcode,"pam_set_item(PAM_RUSER)");
+ }
+
+ retcode = gethostname(buffer, sizeof(buffer)-1);
+ if (retcode) {
+ perror("failed to look up hostname");
+ retcode = pam_end(pamh, PAM_ABORT);
+ bail_out(pamh,1,retcode,"pam_end");
+ }
+ retcode = pam_set_item(pamh, PAM_RHOST, buffer);
+ bail_out(pamh,1,retcode,"pam_set_item(PAM_RHOST)");
+
+ tty = ttyname(fileno(stdin));
+ if (tty) {
+ retcode = pam_set_item(pamh, PAM_TTY, tty);
+ bail_out(pamh,1,retcode,"pam_set_item(PAM_RHOST)");
+ }
+ }
+
+ /* to avoid using goto we abuse a loop here */
+ for (;;) {
+ /* authenticate the user --- `0' here, could have been PAM_SILENT
+ * | PAM_DISALLOW_NULL_AUTHTOK */
+
+ retcode = pam_authenticate(pamh, 0);
+ bail_out(pamh,0,retcode,"pam_authenticate");
+
+ /* has the user proved themself valid? */
+ if (retcode != PAM_SUCCESS) {
+ fprintf(stderr,"%s: invalid request\n",argv[0]);
+ break;
+ }
+
+ /* the user is valid, but should they have access at this
+ time? */
+
+ retcode = pam_acct_mgmt(pamh, 0); /* `0' could be as above */
+ bail_out(pamh,0,retcode,"pam_acct_mgmt");
+
+ if (retcode == PAM_NEW_AUTHTOK_REQD) {
+ fprintf(stderr,"Application must request new password...\n");
+ retcode = pam_chauthtok(pamh,PAM_CHANGE_EXPIRED_AUTHTOK);
+ bail_out(pamh,0,retcode,"pam_chauthtok");
+ }
+
+ if (retcode != PAM_SUCCESS) {
+ fprintf(stderr,"%s: invalid request\n",argv[0]);
+ break;
+ }
+
+ /* `0' could be as above */
+ retcode = pam_setcred(pamh, PAM_ESTABLISH_CRED);
+ bail_out(pamh,0,retcode,"pam_setcred");
+
+ if (retcode != PAM_SUCCESS) {
+ fprintf(stderr,"%s: problem setting user credentials\n"
+ ,argv[0]);
+ break;
+ }
+
+ /* open a session for the user --- `0' could be PAM_SILENT */
+ retcode = pam_open_session(pamh,0);
+ bail_out(pamh,0,retcode,"pam_open_session");
+ if (retcode != PAM_SUCCESS) {
+ fprintf(stderr,"%s: problem opening a session\n",argv[0]);
+ break;
+ }
+
+ pam_get_item(pamh, PAM_USER, &username);
+ fprintf(stderr,
+ "The user [%s] has been authenticated and `logged in'\n",
+ (const char *)username);
+
+ /* this is always a really bad thing for security! */
+ retcode = system("/bin/sh");
+
+ /* close a session for the user --- `0' could be PAM_SILENT
+ * it is possible that this pam_close_call is in another program..
+ */
+
+ retcode = pam_close_session(pamh,0);
+ bail_out(pamh,0,retcode,"pam_close_session");
+ if (retcode != PAM_SUCCESS) {
+ fprintf(stderr,"%s: problem closing a session\n",argv[0]);
+ break;
+ }
+
+ /* `0' could be as above */
+ retcode = pam_setcred(pamh, PAM_DELETE_CRED);
+ bail_out(pamh,0,retcode,"pam_setcred");
+ if (retcode != PAM_SUCCESS) {
+ fprintf(stderr,"%s: problem deleting user credentials\n"
+ ,argv[0]);
+ break;
+ }
+
+ break; /* don't go on for ever! */
+ }
+
+ /* close the Linux-PAM library */
+ retcode = pam_end(pamh, PAM_SUCCESS);
+ pamh = NULL;
+ bail_out(pamh,1,retcode,"pam_end");
+
+ return (0);
+}