initial PAM module
authorEugene Crosser <Eugene.Crosser@ru.ibm.com>
Wed, 4 Dec 2013 14:31:08 +0000 (18:31 +0400)
committerEugene Crosser <Eugene.Crosser@ru.ibm.com>
Wed, 4 Dec 2013 14:31:08 +0000 (18:31 +0400)
Makefile.am
authfile.c
configure.ac
pam_pcsc_cr.c

index d974a5c104cac542f57c1a394d3c5488138f2653..d6eeb62c8d38f72119b1bfc80935f92cb42ede06 100644 (file)
@@ -3,6 +3,9 @@
 AUTOMAKE_OPTIONS = foreign
 ACLOCAL_AMFLAGS = -I m4
 
+libdir = $(PAMDIR)
+DEFS = -DDEBUG_PAM -DPAM_DEBUG @DEFS@
+
 noinst_HEADERS = pcsc_cr.h token.h crypto_if.h crypto.h serial.h authobj.h \
                authfile.h
 
index 8c023d1e8e3a8a0ddd422082d96c5288e69dabec..6937a665dddd68b66d85c22ef1394846530ab6ce 100644 (file)
@@ -215,7 +215,7 @@ struct _auth_obj authfile(const char *tokenid,
        }
 
        if (!ret.err) {
-               int bufsize = (w.userid?strlen(w.userid)+1:0) + ao.paylsize;
+               int bufsize = (w.userid?strlen(w.userid)+1:0) + ao.paylsize + 1;
                if (bufsize) {
                        if ((ret.buffer = malloc(bufsize)) == NULL) {
                                ret.err = "authfile malloc failed";
@@ -229,8 +229,9 @@ struct _auth_obj authfile(const char *tokenid,
                                }
                                if (ao.payload) {
                                        memcpy(p, ao.payload, ao.paylsize);
+                                       p[ao.paylsize] = '\0';
                                        ret.payload = p;
-                                       ret.paylsize = ao.paylsize;
+                                       ret.paylsize = ao.paylsize+1;
                                }
                        }
                }
index 17b40dda9711a63f8e5145c65e5437da20a1380e..43a5f592a7edae394d2069f1599f249f0676f5ca 100644 (file)
@@ -19,6 +19,22 @@ AC_PROG_INSTALL
 AM_PROG_LIBTOOL
 PKG_PROG_PKG_CONFIG
 
+AC_CHECK_HEADERS([security/pam_appl.h], [], [
+  AC_MSG_ERROR([[PAM headers not found]])
+])
+AC_CHECK_HEADERS([security/pam_modules.h security/_pam_macros.h \
+                 security/pam_modutil.h], [], [], [
+#include <sys/types.h>
+#include <security/pam_appl.h>
+])
+AC_CHECK_LIB([pam], [pam_start])
+AC_CHECK_FUNCS([pam_modutil_drop_priv])
+AC_SUBST(PAMDIR, "\$(exec_prefix)/lib/security")
+AC_ARG_WITH(pam-dir,
+       [  --with-pam-dir=DIR                path to install PAM module],
+       [PAMDIR="$withval"],
+       [])
+
 PKG_CHECK_MODULES([PCSC], [libpcsclite])
 AC_ARG_WITH(pcsclite-include-path,
        [  --with-pcsclite-include-path=PATH path to pcsclite includes],
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..b1014486e1fa8689ff5cfb09866ddc0af5557926 100644 (file)
@@ -0,0 +1,170 @@
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <syslog.h>
+#include "authobj.h"
+#include "authfile.h"
+#include "pcsc_cr.h"
+
+#ifndef PIC
+# define PAM_STATIC
+#endif
+
+#define PAM_SM_AUTH
+
+#ifdef HAVE_SECURITY_PAM_APPL_H
+# include <security/pam_appl.h>
+#endif
+#ifdef HAVE_SECURITY_PAM_MODULES_H
+# include <security/pam_modules.h>
+#endif
+
+#ifndef PAM_EXTERN
+# ifdef PAM_STATIC
+#  define PAM_EXTERN static
+# else
+#  define PAM_EXTERN extern
+# endif
+#endif
+
+static struct _auth_chunk
+token_key(const unsigned char *challenge, const int challengesize)
+{
+       struct _auth_chunk ho = {0};
+       long rc;
+       int keysize = sizeof(ho.data);
+
+       if ((rc = pcsc_cr(challenge, challengesize, ho.data, &keysize))) {
+               ho.err = pcsc_errstr(rc);
+       }
+       return ho;
+}
+
+static void update_nonce(char *nonce, const int nonsize)
+{
+       int n = 0;
+
+       sscanf(nonce, "%d", &n);
+       snprintf(nonce, nonsize, "%d", n+1);
+}
+
+struct _cfg {
+       int verbose;
+};
+
+void parse_cfg(struct _cfg * const cfg, int argc, const char *argv[])
+{
+       int i;
+
+       for (i = 0; i < argc; i++) {
+               if (strchr(argv[i],':') && strchr(argv[i],'='))
+                       pcsc_option(argv[i]);
+               else if (!strcmp(argv[i], "verbose")) cfg->verbose = 1;
+       }
+}
+
+PAM_EXTERN int
+pam_sm_authenticate(pam_handle_t *pamh, int flags,
+       int argc, const char *argv[])
+{
+       struct _cfg cfg;
+       const char *tokenid = NULL;
+       const char *user;
+       const char *password;
+       struct _auth_obj ao;
+       int pam_err;
+
+       parse_cfg(&cfg, argc, argv);
+
+       if ((pam_err = pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS) {
+               if (cfg.verbose) syslog(LOG_ERR, "get_user failed: %s",
+                                       pam_strerror(pamh, pam_err));
+               return (pam_err);
+       }
+       if (strspn(user, "0123456789") == strlen(user)) {
+               tokenid = user;
+               user = NULL;
+       }
+
+       if (flags & PAM_DISALLOW_NULL_AUTHTOK) {
+               if ((pam_err = pam_get_item(pamh, PAM_AUTHTOK,
+                                       (const void **)&password))) {
+                       if (cfg.verbose) syslog(LOG_ERR,
+                                       "get_authtok failed: %s",
+                                       pam_strerror(pamh, pam_err));
+                       return (pam_err);
+               }
+       } else {
+               password = "";
+       }
+
+       ao = authfile(tokenid, user, password, update_nonce,
+                       NULL, 0, NULL, 0, token_key);
+       if (ao.err) {
+               if (cfg.verbose) syslog(LOG_INFO, "authfile: %s", ao.err);
+               return PAM_AUTH_ERR;
+       } else {
+               if (!user)
+                       pam_set_item(pamh, PAM_USER, ao.data);
+               if (ao.payload && ao.payload[0])
+                       pam_set_item(pamh, PAM_AUTHTOK, ao.payload);
+               return PAM_SUCCESS;
+       }
+}
+
+PAM_EXTERN int
+pam_sm_setcred(pam_handle_t *pamh, int flags,
+       int argc, const char *argv[])
+{
+       return PAM_SUCCESS;
+}
+
+PAM_EXTERN int
+pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
+       int argc, const char *argv[])
+{
+       return PAM_SUCCESS;
+}
+
+PAM_EXTERN int
+pam_sm_open_session(pam_handle_t *pamh, int flags,
+       int argc, const char *argv[])
+{
+       return PAM_SUCCESS;
+}
+
+PAM_EXTERN int
+pam_sm_close_session(pam_handle_t *pamh, int flags,
+       int argc, const char *argv[])
+{
+       return PAM_SUCCESS;
+}
+
+PAM_EXTERN int
+pam_sm_chauthtok(pam_handle_t *pamh, int flags,
+       int argc, const char *argv[])
+{
+       return PAM_SERVICE_ERR;
+}
+
+#ifdef PAM_MODULE_ENTRY
+PAM_MODULE_ENTRY("pam_unix");
+#endif
+
+#ifdef PAM_STATIC
+struct pam_module _pam_pcsc_cr_modstruct = {
+       "pam_pcsc_cr",
+       pam_sm_authenticate,
+       pam_sm_setcred,
+       pam_sm_acct_mgmt,
+       pam_sm_open_session,
+       pam_sm_close_session,
+       pam_sm_chauthtok
+};
+#endif