diff options
Diffstat (limited to 'examples')
| -rw-r--r-- | examples/Makefile.am | 14 | ||||
| -rw-r--r-- | examples/Makefile.in | 686 | ||||
| -rw-r--r-- | examples/README | 12 | ||||
| -rw-r--r-- | examples/blank.c | 158 | ||||
| -rw-r--r-- | examples/check_user.c | 60 | ||||
| -rw-r--r-- | examples/vpass.c | 49 | ||||
| -rw-r--r-- | examples/xsh.c | 173 |
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;; 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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); +} |