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Diff for /embedaddon/sudo/src/load_plugins.c between versions 1.1.1.1 and 1.1.1.5

version 1.1.1.1, 2012/02/21 16:23:02 version 1.1.1.5, 2014/06/15 16:12:55
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 37 Line 36
 #ifdef HAVE_UNISTD_H  #ifdef HAVE_UNISTD_H
 # include <unistd.h>  # include <unistd.h>
 #endif /* HAVE_UNISTD_H */  #endif /* HAVE_UNISTD_H */
 #ifdef HAVE_DLOPEN  
 # include <dlfcn.h>  
 #else  
 # include "compat/dlfcn.h"  
 #endif  
 #include <errno.h>  #include <errno.h>
   
 #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_dso.h"
   #include "sudo_debug.h"
   
#ifndef RTLD_GLOBAL/* We always use the same name for the sudoers plugin, regardless of the OS */
# define RTLD_GLOBAL     0#define SUDOERS_PLUGIN  "sudoers.so"
#endif 
   
#ifdef _PATH_SUDO_NOEXEC#ifdef _PATH_SUDO_PLUGIN_DIR
const char *noexec_path = _PATH_SUDO_NOEXEC;static int
#endifsudo_stat_plugin(struct plugin_info *info, char *fullpath,
    size_t pathsize, struct stat *sb)
/* 
 * Read in /etc/sudo.conf 
 * Returns a list of plugins. 
 */ 
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(U_("error in %s, line %d while loading plugin `%s'"),
                 _PATH_SUDO_CONF, info->lineno, info->symbol_name);
             warningx(U_("%s: %s"), info->path, strerror(ENAMETOOLONG));
             goto done;
         }
         status = stat(fullpath, sb);
     } else {
         int len;
   
    while ((cp = sudo_parseln(fp)) != NULL) {#ifdef STATIC_SUDOERS_PLUGIN
        /* Skip blank or comment lines */        /* Check static symbols. */
        if (*cp == '\0')        if (strcmp(info->path, SUDOERS_PLUGIN) == 0) {
            continue;            if (strlcpy(fullpath, info->path, pathsize) >= pathsize) {
                 warningx(U_("error in %s, line %d while loading plugin `%s'"),
                     _PATH_SUDO_CONF, info->lineno, info->symbol_name);
                 warningx(U_("%s: %s"), info->path, strerror(ENAMETOOLONG));
                 goto done;
             }
             /* Plugin is static, fake up struct stat. */
             memset(sb, 0, sizeof(*sb));
             sb->st_uid = ROOT_UID;
             sb->st_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH;
             status = 0;
             goto done;
         }
 #endif /* STATIC_SUDOERS_PLUGIN */
   
        /* Look for a line starting with "Path" */        len = snprintf(fullpath, pathsize, "%s%s", _PATH_SUDO_PLUGIN_DIR,
        if (strncasecmp(cp, "Path", 4) == 0) {            info->path);
            /* Parse line */        if (len <= 0 || (size_t)len >= pathsize) {
            if ((name = strtok(cp + 4, " \t")) == NULL ||            warningx(U_("error in %s, line %d while loading plugin `%s'"),
                (path = strtok(NULL, " \t")) == NULL) {                _PATH_SUDO_CONF, info->lineno, info->symbol_name);
                continue;            warningx(U_("%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(U_("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(U_("error in %s, line %d while loading plugin `%s'"),
               _PATH_SUDO_CONF, info->lineno, info->symbol_name);
           warningx(U_("%s must be owned by uid %d"), fullpath, ROOT_UID);
           goto done;
       }
       if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {
           warningx(U_("error in %s, line %d while loading plugin `%s'"),
               _PATH_SUDO_CONF, info->lineno, info->symbol_name);
           warningx(U_("%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 = sudo_dso_load(path, SUDO_DSO_LAZY|SUDO_DSO_GLOBAL);
            if (strlcpy(path, info->path, sizeof(path)) >= sizeof(path)) {    if (!handle) {
                warningx(_("%s: %s"), info->path, strerror(ENAMETOOLONG));        warningx(U_("error in %s, line %d while loading plugin `%s'"),
             _PATH_SUDO_CONF, info->lineno, info->symbol_name);
         warningx(U_("unable to load %s: %s"), path, sudo_dso_strerror());
         goto done;
     }
     plugin = sudo_dso_findsym(handle, info->symbol_name);
     if (!plugin) {
         warningx(U_("error in %s, line %d while loading plugin `%s'"),
             _PATH_SUDO_CONF, info->lineno, info->symbol_name);
         warningx(U_("unable to find symbol `%s' in %s"), info->symbol_name, path);
         goto done;
     }
 
     if (plugin->type != SUDO_POLICY_PLUGIN && plugin->type != SUDO_IO_PLUGIN) {
         warningx(U_("error in %s, line %d while loading plugin `%s'"),
             _PATH_SUDO_CONF, info->lineno, info->symbol_name);
         warningx(U_("unknown policy type %d found in %s"), plugin->type, path);
         goto done;
     }
     if (SUDO_API_VERSION_GET_MAJOR(plugin->version) != SUDO_API_VERSION_MAJOR) {
         warningx(U_("error in %s, line %d while loading plugin `%s'"),
             _PATH_SUDO_CONF, info->lineno, info->symbol_name);
         warningx(U_("incompatible plugin major version %d (expected %d) found in %s"),
             SUDO_API_VERSION_GET_MAJOR(plugin->version),
             SUDO_API_VERSION_MAJOR, path);
         goto done;
     }
     if (plugin->type == SUDO_POLICY_PLUGIN) {
         if (policy_plugin->handle) {
             /* Ignore duplicate entries. */
             if (strcmp(policy_plugin->name, info->symbol_name) != 0) {
                 warningx(U_("ignoring policy plugin `%s' in %s, line %d"),
                     info->symbol_name, _PATH_SUDO_CONF, info->lineno);
                 warningx(U_("only a single policy plugin may be specified"));
                 goto done;                  goto done;
             }              }
        } else {            warningx(U_("ignoring duplicate policy plugin `%s' in %s, line %d"),
            if (snprintf(path, sizeof(path), "%s%s", _PATH_SUDO_PLUGIN_DIR,                info->symbol_name, _PATH_SUDO_CONF, info->lineno);
                info->path) >= sizeof(path)) {            sudo_dso_unload(handle);
                warningx(_("%s%s: %s"), _PATH_SUDO_PLUGIN_DIR, info->path,            handle = NULL;
                    strerror(ENAMETOOLONG)); 
                goto done; 
            } 
         }          }
        if (stat(path, &sb) != 0) {        if (handle != NULL) {
            warning("%s", path);            policy_plugin->handle = handle;
            goto done;            policy_plugin->name = info->symbol_name;
             policy_plugin->options = info->options;
             policy_plugin->u.generic = plugin;
         }          }
        if (sb.st_uid != ROOT_UID) {    } else if (plugin->type == SUDO_IO_PLUGIN) {
            warningx(_("%s must be owned by uid %d"), path, ROOT_UID);        /* Check for duplicate entries. */
            goto done;        TAILQ_FOREACH(container, io_plugins, entries) {
             if (strcmp(container->name, info->symbol_name) == 0) {
                 warningx(U_("ignoring duplicate I/O plugin `%s' in %s, line %d"),
                     info->symbol_name, _PATH_SUDO_CONF, info->lineno);
                 sudo_dso_unload(handle);
                 handle = NULL;
                 break;
             }
         }          }
        if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {        if (handle != NULL) {
            warningx(_("%s must be only be writable by owner"), path);            container = ecalloc(1, sizeof(*container));
            goto done;            container->handle = handle;
             container->name = info->symbol_name;
             container->options = info->options;
             container->u.generic = plugin;
             TAILQ_INSERT_TAIL(io_plugins, container, entries);
         }          }
       }
   
        /* Open plugin and map in symbol */    rval = true;
        handle = dlopen(path, RTLD_LAZY|RTLD_GLOBAL);done:
        if (!handle) {    debug_return_bool(rval);
            warningx(_("unable to dlopen %s: %s"), path, dlerror());}
 
 /*
  * 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();
     TAILQ_FOREACH(info, plugins, entries) {
         rval = sudo_load_plugin(policy_plugin, io_plugins, info);
         if (!rval)
             goto done;              goto done;
        }    }
        plugin = dlsym(handle, info->symbol_name); 
        if (!plugin) { 
            warningx(_("%s: unable to find symbol %s"), path, 
                info->symbol_name); 
            goto done; 
        } 
   
        if (plugin->type != SUDO_POLICY_PLUGIN && plugin->type != SUDO_IO_PLUGIN) {    /*
            warningx(_("%s: unknown policy type %d"), path, plugin->type);     * 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) {
         /* Default policy plugin */
         info = ecalloc(1, sizeof(*info));
         info->symbol_name = "sudoers_policy";
         info->path = SUDOERS_PLUGIN;
         /* info->options = NULL; */
         rval = sudo_load_plugin(policy_plugin, io_plugins, info);
         efree(info);
         if (!rval)
             goto done;              goto done;
        }
        if (SUDO_API_VERSION_GET_MAJOR(plugin->version) != SUDO_API_VERSION_MAJOR) {        /* Default I/O plugin */
            warningx(_("%s: incompatible policy major version %d, expected %d"),        if (TAILQ_EMPTY(io_plugins)) {
                path, SUDO_API_VERSION_GET_MAJOR(plugin->version),            info = ecalloc(1, sizeof(*info));
                SUDO_API_VERSION_MAJOR);            info->symbol_name = "sudoers_io";
            goto done;            info->path = SUDOERS_PLUGIN;
        }            /* info->options = NULL; */
        if (plugin->type == SUDO_POLICY_PLUGIN) {            rval = sudo_load_plugin(policy_plugin, io_plugins, info);
            if (policy_plugin->handle) {            efree(info);
                warningx(_("%s: only a single policy plugin may be loaded"),            if (!rval)
                    conf_file); 
                 goto done;                  goto done;
             }  
             policy_plugin->handle = handle;  
             policy_plugin->name = info->symbol_name;  
             policy_plugin->u.generic = plugin;  
         } else if (plugin->type == SUDO_IO_PLUGIN) {  
             container = emalloc(sizeof(*container));  
             container->prev = container;  
             container->next = NULL;  
             container->handle = handle;  
             container->name = info->symbol_name;  
             container->u.generic = plugin;  
             tq_append(io_plugins, container);  
         }          }
     }      }
     if (policy_plugin->handle == NULL) {  
         warningx(_("%s: at least one policy plugin must be specified"),  
             conf_file);  
         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(U_("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);
     }
     TAILQ_FOREACH(container, io_plugins, entries) {
         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.1.1.1.5

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