[BACK]Return to load_plugins.c CVS log [TXT] [DIR] Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / sudo / src

Diff for /embedaddon/sudo/src/load_plugins.c between versions 1.1.1.1 and 1.1.1.4

version 1.1.1.1, 2012/02/21 16:23:02 version 1.1.1.4, 2013/07/22 10:46:13
Line 1 Line 1
 /*  /*
 * Copyright (c) 2009-2011 Todd C. Miller <Todd.Miller@courtesan.com> * Copyright (c) 2009-2013 Todd C. Miller <Todd.Miller@courtesan.com>
  *   *
  * Permission to use, copy, modify, and distribute this software for any   * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above   * purpose with or without fee is hereby granted, provided that the above
Line 17 Line 17
 #include <config.h>  #include <config.h>
   
 #include <sys/types.h>  #include <sys/types.h>
 #include <sys/param.h>  
 #include <sys/stat.h>  #include <sys/stat.h>
 #include <stdio.h>  #include <stdio.h>
 #ifdef STDC_HEADERS  #ifdef STDC_HEADERS
Line 47 Line 46
 #include "sudo.h"  #include "sudo.h"
 #include "sudo_plugin.h"  #include "sudo_plugin.h"
 #include "sudo_plugin_int.h"  #include "sudo_plugin_int.h"
   #include "sudo_conf.h"
   #include "sudo_debug.h"
   
 #ifndef RTLD_GLOBAL  #ifndef RTLD_GLOBAL
 # define RTLD_GLOBAL    0  # define RTLD_GLOBAL    0
 #endif  #endif
   
#ifdef _PATH_SUDO_NOEXEC#ifndef SUDOERS_PLUGIN
const char *noexec_path = _PATH_SUDO_NOEXEC;# define SUDOERS_PLUGIN      "sudoers.la"
 #endif  #endif
   
/*#ifdef _PATH_SUDO_PLUGIN_DIR
 * Read in /etc/sudo.confstatic int
 * Returns a list of plugins.sudo_stat_plugin(struct plugin_info *info, char *fullpath,
 */    size_t pathsize, struct stat *sb)
static struct plugin_info_list * 
sudo_read_conf(const char *conf_file) 
 {  {
    FILE *fp;    int status = -1;
    char *cp, *name, *path;    debug_decl(sudo_stat_plugin, SUDO_DEBUG_PLUGIN)
    struct plugin_info *info; 
    static struct plugin_info_list pil; /* XXX */ 
   
    if ((fp = fopen(conf_file, "r")) == NULL)    if (info->path[0] == '/') {
        goto done;        if (strlcpy(fullpath, info->path, pathsize) >= pathsize) {
            warningx(_("error in %s, line %d while loading plugin `%s'"),
    while ((cp = sudo_parseln(fp)) != NULL) {                _PATH_SUDO_CONF, info->lineno, info->symbol_name);
        /* Skip blank or comment lines */            warningx(_("%s: %s"), info->path, strerror(ENAMETOOLONG));
        if (*cp == '\0')            goto done;
            continue;        }
        status = stat(fullpath, sb);
        /* Look for a line starting with "Path" */    } else {
        if (strncasecmp(cp, "Path", 4) == 0) {        if (snprintf(fullpath, pathsize, "%s%s", _PATH_SUDO_PLUGIN_DIR,
            /* Parse line */            info->path) >= pathsize) {
            if ((name = strtok(cp + 4, " \t")) == NULL ||            warningx(_("error in %s, line %d while loading plugin `%s'"),
                (path = strtok(NULL, " \t")) == NULL) {                _PATH_SUDO_CONF, info->lineno, info->symbol_name);
                continue;            warningx(_("%s%s: %s"), _PATH_SUDO_PLUGIN_DIR, info->path,
                 strerror(ENAMETOOLONG));
             goto done;
         }
         /* Try parent dir for compatibility with old plugindir default. */
         if ((status = stat(fullpath, sb)) != 0) {
             char *cp = strrchr(fullpath, '/');
             if (cp > fullpath + 4 && cp[-5] == '/' && cp[-4] == 's' &&
                 cp[-3] == 'u' && cp[-2] == 'd' && cp[-1] == 'o') {
                 int serrno = errno;
                 strlcpy(cp - 4, info->path, pathsize - (cp - 4 - fullpath));
                 if ((status = stat(fullpath, sb)) != 0)
                     errno = serrno;
             }              }
             if (strcasecmp(name, "askpass") == 0)  
                 askpass_path = estrdup(path);  
 #ifdef _PATH_SUDO_NOEXEC  
             else if (strcasecmp(name, "noexec") == 0)  
                 noexec_path = estrdup(path);  
 #endif  
             continue;  
         }          }
   # ifdef __hpux
           /* Try .sl instead of .so on HP-UX for backwards compatibility. */
           if (status != 0) {
               size_t len = strlen(info->path);
               if (len >= 3 && info->path[len - 3] == '.' &&
                   info->path[len - 2] == 's' && info->path[len - 1] == 'o') {
                   const char *sopath = info->path;
                   char *slpath = estrdup(info->path);
                   int serrno = errno;
   
        /* Look for a line starting with "Plugin" */                slpath[len - 1] = 'l';
        if (strncasecmp(cp, "Plugin", 6) == 0) {                info->path = slpath;
            /* Parse line */                status = sudo_stat_plugin(info, fullpath, pathsize, sb);
            if ((name = strtok(cp + 6, " \t")) == NULL ||                if (status == 0) {
                (path = strtok(NULL, " \t")) == NULL) {                    efree((void *)sopath);
                continue;                } else {
                     efree(slpath);
                     info->path = sopath;
                     errno = serrno;
                 }
             }              }
             info = emalloc(sizeof(*info));  
             info->symbol_name = estrdup(name);  
             info->path = estrdup(path);  
             info->prev = info;  
             info->next = NULL;  
             tq_append(&pil, info);  
             continue;  
         }          }
   # endif /* __hpux */
     }      }
     fclose(fp);  
   
 done:  done:
    if (tq_empty(&pil)) {    debug_return_int(status);
        /* Default policy plugin */}
        info = emalloc(sizeof(*info)); 
        info->symbol_name = "sudoers_policy"; 
        info->path = SUDOERS_PLUGIN; 
        info->prev = info; 
        info->next = NULL; 
        tq_append(&pil, info); 
   
        /* Default I/O plugin */static bool
        info = emalloc(sizeof(*info));sudo_check_plugin(struct plugin_info *info, char *fullpath, size_t pathsize)
        info->symbol_name = "sudoers_io";{
        info->path = SUDOERS_PLUGIN;    struct stat sb;
        info->prev = info;    int rval = false;
        info->next = NULL;    debug_decl(sudo_check_plugin, SUDO_DEBUG_PLUGIN)
        tq_append(&pil, info);
     if (sudo_stat_plugin(info, fullpath, pathsize, &sb) != 0) {
         warningx(_("error in %s, line %d while loading plugin `%s'"),
             _PATH_SUDO_CONF, info->lineno, info->symbol_name);
         warning("%s%s", _PATH_SUDO_PLUGIN_DIR, info->path);
         goto done;
     }      }
       if (sb.st_uid != ROOT_UID) {
           warningx(_("error in %s, line %d while loading plugin `%s'"),
               _PATH_SUDO_CONF, info->lineno, info->symbol_name);
           warningx(_("%s must be owned by uid %d"), fullpath, ROOT_UID);
           goto done;
       }
       if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {
           warningx(_("error in %s, line %d while loading plugin `%s'"),
               _PATH_SUDO_CONF, info->lineno, info->symbol_name);
           warningx(_("%s must be only be writable by owner"), fullpath);
           goto done;
       }
       rval = true;
   
    return &pil;done:
     debug_return_bool(rval);
 }  }
   #else
   static bool
   sudo_check_plugin(struct plugin_info *info, char *fullpath, size_t pathsize)
   {
       debug_decl(sudo_check_plugin, SUDO_DEBUG_PLUGIN)
       (void)strlcpy(fullpath, info->path, pathsize);
       debug_return_bool(true);
   }
   #endif /* _PATH_SUDO_PLUGIN_DIR */
   
 /*  /*
 * Load the plugins listed in conf_file. * Load the plugin specified by "info".
  */   */
intstatic bool
sudo_load_plugins(const char *conf_file,sudo_load_plugin(struct plugin_container *policy_plugin,
    struct plugin_container *policy_plugin,    struct plugin_container_list *io_plugins, struct plugin_info *info)
    struct plugin_container_list *io_plugins) 
 {  {
     struct generic_plugin *plugin;  
     struct plugin_container *container;      struct plugin_container *container;
    struct plugin_info *info;    struct generic_plugin *plugin;
    struct plugin_info_list *plugin_list; 
    struct stat sb; 
    void *handle; 
     char path[PATH_MAX];      char path[PATH_MAX];
    int rval = FALSE;    bool rval = false;
     void *handle;
     debug_decl(sudo_load_plugin, SUDO_DEBUG_PLUGIN)
   
    /* Parse sudo.conf */    /* Sanity check plugin and fill in path */
    plugin_list = sudo_read_conf(conf_file);    if (!sudo_check_plugin(info, path, sizeof(path)))
         goto done;
   
    tq_foreach_fwd(plugin_list, info) {    /* Open plugin and map in symbol */
        if (info->path[0] == '/') {    handle = dlopen(path, RTLD_LAZY|RTLD_GLOBAL);
            if (strlcpy(path, info->path, sizeof(path)) >= sizeof(path)) {    if (!handle) {
                warningx(_("%s: %s"), info->path, strerror(ENAMETOOLONG));        warningx(_("error in %s, line %d while loading plugin `%s'"),
                goto done;            _PATH_SUDO_CONF, info->lineno, info->symbol_name);
            }        warningx(_("unable to dlopen %s: %s"), path, dlerror());
        } else {        goto done;
            if (snprintf(path, sizeof(path), "%s%s", _PATH_SUDO_PLUGIN_DIR,    }
                info->path) >= sizeof(path)) {    plugin = dlsym(handle, info->symbol_name);
                warningx(_("%s%s: %s"), _PATH_SUDO_PLUGIN_DIR, info->path,    if (!plugin) {
                    strerror(ENAMETOOLONG));        warningx(_("error in %s, line %d while loading plugin `%s'"),
                goto done;            _PATH_SUDO_CONF, info->lineno, info->symbol_name);
            }        warningx(_("unable to find symbol `%s' in %s"), info->symbol_name, path);
        }        goto done;
        if (stat(path, &sb) != 0) {    }
            warning("%s", path); 
            goto done; 
        } 
        if (sb.st_uid != ROOT_UID) { 
            warningx(_("%s must be owned by uid %d"), path, ROOT_UID); 
            goto done; 
        } 
        if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) { 
            warningx(_("%s must be only be writable by owner"), path); 
            goto done; 
        } 
   
        /* Open plugin and map in symbol */    if (plugin->type != SUDO_POLICY_PLUGIN && plugin->type != SUDO_IO_PLUGIN) {
        handle = dlopen(path, RTLD_LAZY|RTLD_GLOBAL);        warningx(_("error in %s, line %d while loading plugin `%s'"),
        if (!handle) {            _PATH_SUDO_CONF, info->lineno, info->symbol_name);
            warningx(_("unable to dlopen %s: %s"), path, dlerror());        warningx(_("unknown policy type %d found in %s"), plugin->type, path);
            goto done;        goto done;
        }    }
        plugin = dlsym(handle, info->symbol_name);    if (SUDO_API_VERSION_GET_MAJOR(plugin->version) != SUDO_API_VERSION_MAJOR) {
        if (!plugin) {        warningx(_("error in %s, line %d while loading plugin `%s'"),
            warningx(_("%s: unable to find symbol %s"), path,            _PATH_SUDO_CONF, info->lineno, info->symbol_name);
                info->symbol_name);        warningx(_("incompatible plugin major version %d (expected %d) found in %s"),
            goto done;            SUDO_API_VERSION_GET_MAJOR(plugin->version),
        }            SUDO_API_VERSION_MAJOR, path);
        goto done;
        if (plugin->type != SUDO_POLICY_PLUGIN && plugin->type != SUDO_IO_PLUGIN) {    }
            warningx(_("%s: unknown policy type %d"), path, plugin->type);    if (plugin->type == SUDO_POLICY_PLUGIN) {
            goto done;        if (policy_plugin->handle) {
        }            /* Ignore duplicate entries. */
        if (SUDO_API_VERSION_GET_MAJOR(plugin->version) != SUDO_API_VERSION_MAJOR) {            if (strcmp(policy_plugin->name, info->symbol_name) != 0) {
            warningx(_("%s: incompatible policy major version %d, expected %d"),                warningx(_("ignoring policy plugin `%s' in %s, line %d"),
                path, SUDO_API_VERSION_GET_MAJOR(plugin->version),                    info->symbol_name, _PATH_SUDO_CONF, info->lineno);
                SUDO_API_VERSION_MAJOR);                warningx(_("only a single policy plugin may be specified"));
            goto done; 
        } 
        if (plugin->type == SUDO_POLICY_PLUGIN) { 
            if (policy_plugin->handle) { 
                warningx(_("%s: only a single policy plugin may be loaded"), 
                    conf_file); 
                 goto done;                  goto done;
             }              }
               warningx(_("ignoring duplicate policy plugin `%s' in %s, line %d"),
                   info->symbol_name, _PATH_SUDO_CONF, info->lineno);
               dlclose(handle);
               handle = NULL;
           }
           if (handle != NULL) {
             policy_plugin->handle = handle;              policy_plugin->handle = handle;
             policy_plugin->name = info->symbol_name;              policy_plugin->name = info->symbol_name;
               policy_plugin->options = info->options;
             policy_plugin->u.generic = plugin;              policy_plugin->u.generic = plugin;
        } else if (plugin->type == SUDO_IO_PLUGIN) {        }
            container = emalloc(sizeof(*container));    } else if (plugin->type == SUDO_IO_PLUGIN) {
         /* Check for duplicate entries. */
         tq_foreach_fwd(io_plugins, container) {
             if (strcmp(container->name, info->symbol_name) == 0) {
                 warningx(_("ignoring duplicate I/O plugin `%s' in %s, line %d"),
                     info->symbol_name, _PATH_SUDO_CONF, info->lineno);
                 dlclose(handle);
                 handle = NULL;
                 break;
             }
         }
         if (handle != NULL) {
             container = ecalloc(1, sizeof(*container));
             container->prev = container;              container->prev = container;
            container->next = NULL;            /* container->next = NULL; */
             container->handle = handle;              container->handle = handle;
             container->name = info->symbol_name;              container->name = info->symbol_name;
               container->options = info->options;
             container->u.generic = plugin;              container->u.generic = plugin;
             tq_append(io_plugins, container);              tq_append(io_plugins, container);
         }          }
     }      }
   
       rval = true;
   done:
       debug_return_bool(rval);
   }
   
   /*
    * Load the plugins listed in sudo.conf.
    */
   bool
   sudo_load_plugins(struct plugin_container *policy_plugin,
       struct plugin_container_list *io_plugins)
   {
       struct plugin_container *container;
       struct plugin_info_list *plugins;
       struct plugin_info *info;
       bool rval = false;
       debug_decl(sudo_load_plugins, SUDO_DEBUG_PLUGIN)
   
       /* Walk the plugin list from sudo.conf, if any. */
       plugins = sudo_conf_plugins();
       tq_foreach_fwd(plugins, info) {
           rval = sudo_load_plugin(policy_plugin, io_plugins, info);
           if (!rval)
               goto done;
       }
   
       /*
        * If no policy plugin, fall back to the default (sudoers).
        * If there is also no I/O log plugin, sudoers for that too.
        */
     if (policy_plugin->handle == NULL) {      if (policy_plugin->handle == NULL) {
        warningx(_("%s: at least one policy plugin must be specified"),        /* Default policy plugin */
            conf_file);        info = ecalloc(1, sizeof(*info));
        goto done;        info->symbol_name = "sudoers_policy";
         info->path = SUDOERS_PLUGIN;
         /* info->options = NULL; */
         info->prev = info;
         /* info->next = NULL; */
         rval = sudo_load_plugin(policy_plugin, io_plugins, info);
         efree(info);
         if (!rval)
             goto done;
 
         /* Default I/O plugin */
         if (tq_empty(io_plugins)) {
             info = ecalloc(1, sizeof(*info));
             info->symbol_name = "sudoers_io";
             info->path = SUDOERS_PLUGIN;
             /* info->options = NULL; */
             info->prev = info;
             /* info->next = NULL; */
             rval = sudo_load_plugin(policy_plugin, io_plugins, info);
             efree(info);
             if (!rval)
                 goto done;
         }
     }      }
     if (policy_plugin->u.policy->check_policy == NULL) {      if (policy_plugin->u.policy->check_policy == NULL) {
         warningx(_("policy plugin %s does not include a check_policy method"),          warningx(_("policy plugin %s does not include a check_policy method"),
             policy_plugin->name);              policy_plugin->name);
           rval = false;
         goto done;          goto done;
     }      }
   
    rval = TRUE;    /* Install hooks (XXX - later). */
     if (policy_plugin->u.policy->version >= SUDO_API_MKVERSION(1, 2)) {
         if (policy_plugin->u.policy->register_hooks != NULL)
             policy_plugin->u.policy->register_hooks(SUDO_HOOK_VERSION, register_hook);
     }
     tq_foreach_fwd(io_plugins, container) {
         if (container->u.io->version >= SUDO_API_MKVERSION(1, 2)) {
             if (container->u.io->register_hooks != NULL)
                 container->u.io->register_hooks(SUDO_HOOK_VERSION, register_hook);
         }
     }
   
 done:  done:
    return rval;    debug_return_bool(rval);
 }  }
Removed from v.1.1.1.1  
changed lines
  Added in v.1.1.1.4

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>