diff options
Diffstat (limited to 'Linux-PAM/examples')
| -rw-r--r-- | Linux-PAM/examples/Makefile.am | 14 | ||||
| -rw-r--r-- | Linux-PAM/examples/Makefile.in | 522 | ||||
| -rw-r--r-- | Linux-PAM/examples/README | 13 | ||||
| -rw-r--r-- | Linux-PAM/examples/blank.c | 158 | ||||
| -rw-r--r-- | Linux-PAM/examples/check_user.c | 60 | ||||
| -rw-r--r-- | Linux-PAM/examples/vpass.c | 51 | ||||
| -rw-r--r-- | Linux-PAM/examples/xsh.c | 173 |
7 files changed, 991 insertions, 0 deletions
diff --git a/Linux-PAM/examples/Makefile.am b/Linux-PAM/examples/Makefile.am new file mode 100644 index 00000000..f8b9f006 --- /dev/null +++ b/Linux-PAM/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$(top_srcdir)/libpam_misc/include +AM_LDFLAGS = -L$(top_builddir)/libpam -lpam \ + -L$(top_builddir)/libpam_misc -lpam_misc + +noinst_PROGRAMS = xsh vpass blank check_user diff --git a/Linux-PAM/examples/Makefile.in b/Linux-PAM/examples/Makefile.in new file mode 100644 index 00000000..cc3c3f9f --- /dev/null +++ b/Linux-PAM/examples/Makefile.in @@ -0,0 +1,522 @@ +# Makefile.in generated by automake 1.10 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006 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@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +noinst_PROGRAMS = xsh$(EXEEXT) vpass$(EXEEXT) blank$(EXEEXT) \ + check_user$(EXEEXT) +subdir = examples +DIST_COMMON = README $(srcdir)/Makefile.am $(srcdir)/Makefile.in +ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 +am__aclocal_m4_deps = $(top_srcdir)/m4/gettext.m4 \ + $(top_srcdir)/m4/iconv.m4 \ + $(top_srcdir)/m4/jh_path_xml_catalog.m4 \ + $(top_srcdir)/m4/ld-O1.m4 $(top_srcdir)/m4/ld-as-needed.m4 \ + $(top_srcdir)/m4/lib-ld.m4 $(top_srcdir)/m4/lib-link.m4 \ + $(top_srcdir)/m4/lib-prefix.m4 $(top_srcdir)/m4/libprelude.m4 \ + $(top_srcdir)/m4/nls.m4 $(top_srcdir)/m4/po.m4 \ + $(top_srcdir)/m4/progtest.m4 $(top_srcdir)/acinclude.m4 \ + $(top_srcdir)/configure.in +am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \ + $(ACLOCAL_M4) +mkinstalldirs = $(SHELL) $(top_srcdir)/mkinstalldirs +CONFIG_HEADER = $(top_builddir)/config.h +CONFIG_CLEAN_FILES = +PROGRAMS = $(noinst_PROGRAMS) +blank_SOURCES = blank.c +blank_OBJECTS = blank.$(OBJEXT) +blank_LDADD = $(LDADD) +check_user_SOURCES = check_user.c +check_user_OBJECTS = check_user.$(OBJEXT) +check_user_LDADD = $(LDADD) +vpass_SOURCES = vpass.c +vpass_OBJECTS = vpass.$(OBJEXT) +vpass_LDADD = $(LDADD) +xsh_SOURCES = xsh.c +xsh_OBJECTS = xsh.$(OBJEXT) +xsh_LDADD = $(LDADD) +DEFAULT_INCLUDES = -I. -I$(top_builddir)@am__isrc@ +depcomp = $(SHELL) $(top_srcdir)/depcomp +am__depfiles_maybe = depfiles +COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \ + $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) +LTCOMPILE = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \ + --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \ + $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) +CCLD = $(CC) +LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \ + --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) \ + $(LDFLAGS) -o $@ +SOURCES = blank.c check_user.c vpass.c xsh.c +DIST_SOURCES = blank.c check_user.c vpass.c xsh.c +ETAGS = etags +CTAGS = ctags +DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST) +ACLOCAL = @ACLOCAL@ +AMTAR = @AMTAR@ +AR = @AR@ +AUTOCONF = @AUTOCONF@ +AUTOHEADER = @AUTOHEADER@ +AUTOMAKE = @AUTOMAKE@ +AWK = @AWK@ +BROWSER = @BROWSER@ +CC = @CC@ +CCDEPMODE = @CCDEPMODE@ +CFLAGS = @CFLAGS@ +CPP = @CPP@ +CPPFLAGS = @CPPFLAGS@ +CXX = @CXX@ +CXXCPP = @CXXCPP@ +CXXDEPMODE = @CXXDEPMODE@ +CXXFLAGS = @CXXFLAGS@ +CYGPATH_W = @CYGPATH_W@ +DEFS = @DEFS@ +DEPDIR = @DEPDIR@ +ECHO = @ECHO@ +ECHO_C = @ECHO_C@ +ECHO_N = @ECHO_N@ +ECHO_T = @ECHO_T@ +EGREP = @EGREP@ +EXEEXT = @EXEEXT@ +F77 = @F77@ +FFLAGS = @FFLAGS@ +FO2PDF = @FO2PDF@ +GMSGFMT = @GMSGFMT@ +GMSGFMT_015 = @GMSGFMT_015@ +GREP = @GREP@ +HAVE_KEY_MANAGEMENT = @HAVE_KEY_MANAGEMENT@ +INSTALL = @INSTALL@ +INSTALL_DATA = @INSTALL_DATA@ +INSTALL_PROGRAM = @INSTALL_PROGRAM@ +INSTALL_SCRIPT = @INSTALL_SCRIPT@ +INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@ +INTLLIBS = @INTLLIBS@ +INTL_MACOSX_LIBS = @INTL_MACOSX_LIBS@ +LDFLAGS = @LDFLAGS@ +LEX = @LEX@ +LEXLIB = @LEXLIB@ +LEX_OUTPUT_ROOT = @LEX_OUTPUT_ROOT@ +LIBAUDIT = @LIBAUDIT@ +LIBCRACK = @LIBCRACK@ +LIBCRYPT = @LIBCRYPT@ +LIBDB = @LIBDB@ +LIBDL = @LIBDL@ +LIBICONV = @LIBICONV@ +LIBINTL = @LIBINTL@ +LIBNSL = @LIBNSL@ +LIBOBJS = @LIBOBJS@ +LIBPRELUDE_CFLAGS = @LIBPRELUDE_CFLAGS@ +LIBPRELUDE_CONFIG = @LIBPRELUDE_CONFIG@ +LIBPRELUDE_CONFIG_PREFIX = @LIBPRELUDE_CONFIG_PREFIX@ +LIBPRELUDE_LDFLAGS = @LIBPRELUDE_LDFLAGS@ +LIBPRELUDE_LIBS = @LIBPRELUDE_LIBS@ +LIBPRELUDE_PREFIX = @LIBPRELUDE_PREFIX@ +LIBPRELUDE_PTHREAD_CFLAGS = @LIBPRELUDE_PTHREAD_CFLAGS@ +LIBS = @LIBS@ +LIBSELINUX = @LIBSELINUX@ +LIBTOOL = @LIBTOOL@ +LN_S = @LN_S@ +LTLIBICONV = @LTLIBICONV@ +LTLIBINTL = @LTLIBINTL@ +LTLIBOBJS = @LTLIBOBJS@ +MAKEINFO = @MAKEINFO@ +MKDIR_P = @MKDIR_P@ +MSGFMT = @MSGFMT@ +MSGFMT_015 = @MSGFMT_015@ +MSGMERGE = @MSGMERGE@ +OBJEXT = @OBJEXT@ +PACKAGE = @PACKAGE@ +PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@ +PACKAGE_NAME = @PACKAGE_NAME@ +PACKAGE_STRING = @PACKAGE_STRING@ +PACKAGE_TARNAME = @PACKAGE_TARNAME@ +PACKAGE_VERSION = @PACKAGE_VERSION@ +PAM_READ_BOTH_CONFS = @PAM_READ_BOTH_CONFS@ +PATH_SEPARATOR = @PATH_SEPARATOR@ +PIE_CFLAGS = @PIE_CFLAGS@ +PIE_LDFLAGS = @PIE_LDFLAGS@ +POSUB = @POSUB@ +RANLIB = @RANLIB@ +SCONFIGDIR = @SCONFIGDIR@ +SECUREDIR = @SECUREDIR@ +SET_MAKE = @SET_MAKE@ +SHELL = @SHELL@ +STRIP = @STRIP@ +USE_NLS = @USE_NLS@ +VERSION = @VERSION@ +WITH_DEBUG = @WITH_DEBUG@ +WITH_PAMLOCKING = @WITH_PAMLOCKING@ +XGETTEXT = @XGETTEXT@ +XGETTEXT_015 = @XGETTEXT_015@ +XMLCATALOG = @XMLCATALOG@ +XMLLINT = @XMLLINT@ +XML_CATALOG_FILE = @XML_CATALOG_FILE@ +XSLTPROC = @XSLTPROC@ +YACC = @YACC@ +YFLAGS = @YFLAGS@ +abs_builddir = @abs_builddir@ +abs_srcdir = @abs_srcdir@ +abs_top_builddir = @abs_top_builddir@ +abs_top_srcdir = @abs_top_srcdir@ +ac_ct_CC = @ac_ct_CC@ +ac_ct_CXX = @ac_ct_CXX@ +ac_ct_F77 = @ac_ct_F77@ +am__include = @am__include@ +am__leading_dot = @am__leading_dot@ +am__quote = @am__quote@ +am__tar = @am__tar@ +am__untar = @am__untar@ +bindir = @bindir@ +build = @build@ +build_alias = @build_alias@ +build_cpu = @build_cpu@ +build_os = @build_os@ +build_vendor = @build_vendor@ +builddir = @builddir@ +datadir = @datadir@ +datarootdir = @datarootdir@ +docdir = @docdir@ +dvidir = @dvidir@ +exec_prefix = @exec_prefix@ +host = @host@ +host_alias = @host_alias@ +host_cpu = @host_cpu@ +host_os = @host_os@ +host_vendor = @host_vendor@ +htmldir = @htmldir@ +includedir = @includedir@ +infodir = @infodir@ +install_sh = @install_sh@ +libc_cv_fpie = @libc_cv_fpie@ +libdir = @libdir@ +libexecdir = @libexecdir@ +localedir = @localedir@ +localstatedir = @localstatedir@ +mandir = @mandir@ +mkdir_p = @mkdir_p@ +oldincludedir = @oldincludedir@ +pam_cv_ld_as_needed = @pam_cv_ld_as_needed@ +pam_xauth_path = @pam_xauth_path@ +pdfdir = @pdfdir@ +prefix = @prefix@ +program_transform_name = @program_transform_name@ +psdir = @psdir@ +sbindir = @sbindir@ +sharedstatedir = @sharedstatedir@ +srcdir = @srcdir@ +sysconfdir = @sysconfdir@ +target_alias = @target_alias@ +top_builddir 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b/Linux-PAM/examples/README new file mode 100644 index 00000000..f4ae9511 --- /dev/null +++ b/Linux-PAM/examples/README @@ -0,0 +1,13 @@ + +(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/Linux-PAM/examples/blank.c b/Linux-PAM/examples/blank.c new file mode 100644 index 00000000..20896b5c --- /dev/null +++ b/Linux-PAM/examples/blank.c @@ -0,0 +1,158 @@ +/* + * $Id: blank.c,v 1.2 2000/12/04 19:02:33 baggins Exp $ + */ + +/* 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/Linux-PAM/examples/check_user.c b/Linux-PAM/examples/check_user.c new file mode 100644 index 00000000..cb539c4e --- /dev/null +++ b/Linux-PAM/examples/check_user.c @@ -0,0 +1,60 @@ +/* + $Id: check_user.c,v 1.2 2000/12/04 19:02:33 baggins Exp $ + + 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/Linux-PAM/examples/vpass.c b/Linux-PAM/examples/vpass.c new file mode 100644 index 00000000..a54ec061 --- /dev/null +++ b/Linux-PAM/examples/vpass.c @@ -0,0 +1,51 @@ + +#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/Linux-PAM/examples/xsh.c b/Linux-PAM/examples/xsh.c new file mode 100644 index 00000000..ef4dca0c --- /dev/null +++ b/Linux-PAM/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); +} |