contrib/openpam/lib/openpam_dynamic.c

   1 /*-
   2  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
   3  * All rights reserved.
   4  *
   5  * This software was developed for the FreeBSD Project by ThinkSec AS and
   6  * Network Associates Laboratories, the Security Research Division of
   7  * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
   8  * ("CBOSS"), as part of the DARPA CHATS research program.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. The name of the author may not be used to endorse or promote
  19  *    products derived from this software without specific prior written
  20  *    permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $P4: //depot/projects/openpam/lib/openpam_dynamic.c#14 $
  35  */
  36
  37 #include <dlfcn.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42 #include <security/pam_appl.h>
  43
  44 #include "openpam_impl.h"
  45
  46 #ifndef RTLD_NOW
  47 #define RTLD_NOW RTLD_LAZY
  48 #endif
  49
  50 /*
  51  * OpenPAM internal
  52  *
  53  * Locate a dynamically linked module
  54  */
  55
  56 pam_module_t *
  57 openpam_dynamic(const char *path)
  58 {
  59         pam_module_t *module;
  60         const char *prefix;
  61         char *vpath;
  62         void *dlh;
  63         int i;
  64
  65         dlh = NULL;
  66         if ((module = calloc(1, sizeof *module)) == NULL)
  67                 goto buf_err;
  68
  69         /* Prepend the standard prefix if not an absolute pathname. */
  70         if (path[0] != '/')
  71                 prefix = OPENPAM_MODULES_DIR;
  72         else
  73                 prefix = "";
  74
  75         /* try versioned module first, then unversioned module */
  76         if (asprintf(&vpath, "%s%s.%d", prefix, path, LIB_MAJ) < 0)
  77                 goto buf_err;
  78         if ((dlh = dlopen(vpath, RTLD_NOW)) == NULL) {
  79                 openpam_log(PAM_LOG_DEBUG, "%s: %s", vpath, dlerror());
  80                 *strrchr(vpath, '.') = '\0';
  81                 if ((dlh = dlopen(vpath, RTLD_NOW)) == NULL) {
  82                         openpam_log(PAM_LOG_DEBUG, "%s: %s", vpath, dlerror());
  83                         FREE(module);
  84                         return (NULL);
  85                 }
  86         }
  87         FREE(vpath);
  88         if ((module->path = strdup(path)) == NULL)
  89                 goto buf_err;
  90         module->dlh = dlh;
  91         for (i = 0; i < PAM_NUM_PRIMITIVES; ++i) {
  92                 module->func[i] = (pam_func_t)dlsym(dlh, _pam_sm_func_name[i]);
  93                 if (module->func[i] == NULL)
  94                         openpam_log(PAM_LOG_DEBUG, "%s: %s(): %s",
  95                             path, _pam_sm_func_name[i], dlerror());
  96         }
  97         return (module);
  98  buf_err:
  99         openpam_log(PAM_LOG_ERROR, "%m");
 100         if (dlh != NULL)
 101                 dlclose(dlh);
 102         FREE(module);
 103         return (NULL);
 104 }
 105
 106 /*
 107  * NOPARSE
 108  */