--- embedaddon/sudo/src/load_plugins.c	2012/05/29 12:26:49	1.1.1.2
+++ embedaddon/sudo/src/load_plugins.c	2014/06/15 16:12:55	1.1.1.5
@@ -1,5 +1,5 @@
 /*
- * 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
  * purpose with or without fee is hereby granted, provided that the above
@@ -17,7 +17,6 @@
 #include <config.h>
 
 #include <sys/types.h>
-#include <sys/param.h>
 #include <sys/stat.h>
 #include <stdio.h>
 #ifdef STDC_HEADERS
@@ -37,121 +36,289 @@
 #ifdef HAVE_UNISTD_H
 # include <unistd.h>
 #endif /* HAVE_UNISTD_H */
-#ifdef HAVE_DLOPEN
-# include <dlfcn.h>
-#else
-# include "compat/dlfcn.h"
-#endif
 #include <errno.h>
 
 #include "sudo.h"
 #include "sudo_plugin.h"
 #include "sudo_plugin_int.h"
 #include "sudo_conf.h"
+#include "sudo_dso.h"
 #include "sudo_debug.h"
 
-#ifndef RTLD_GLOBAL
-# define RTLD_GLOBAL	0
-#endif
+/* We always use the same name for the sudoers plugin, regardless of the OS */
+#define SUDOERS_PLUGIN	"sudoers.so"
 
-/*
- * Load the plugins listed in sudo.conf.
- */
-bool
-sudo_load_plugins(struct plugin_container *policy_plugin,
-    struct plugin_container_list *io_plugins)
+#ifdef _PATH_SUDO_PLUGIN_DIR
+static int
+sudo_stat_plugin(struct plugin_info *info, char *fullpath,
+    size_t pathsize, struct stat *sb)
 {
-    struct plugin_info_list *plugins;
-    struct generic_plugin *plugin;
-    struct plugin_container *container;
-    struct plugin_info *info;
-    struct stat sb;
-    void *handle;
-    char path[PATH_MAX];
-    bool rval = false;
-    debug_decl(sudo_load_plugins, SUDO_DEBUG_PLUGIN)
+    int status = -1;
+    debug_decl(sudo_stat_plugin, SUDO_DEBUG_PLUGIN)
 
-    /* Walk plugin list. */
-    plugins = sudo_conf_plugins();
-    tq_foreach_fwd(plugins, info) {
-	if (info->path[0] == '/') {
-	    if (strlcpy(path, info->path, sizeof(path)) >= sizeof(path)) {
-		warningx(_("%s: %s"), info->path, strerror(ENAMETOOLONG));
+    if (info->path[0] == '/') {
+	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;
+
+#ifdef STATIC_SUDOERS_PLUGIN
+	/* Check static symbols. */
+	if (strcmp(info->path, SUDOERS_PLUGIN) == 0) {
+	    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;
 	    }
-	} else {
-	    if (snprintf(path, sizeof(path), "%s%s", _PATH_SUDO_PLUGIN_DIR,
-		info->path) >= sizeof(path)) {
-		warningx(_("%s%s: %s"), _PATH_SUDO_PLUGIN_DIR, info->path,
-		    strerror(ENAMETOOLONG));
-		goto done;
-	    }
-	}
-	if (stat(path, &sb) != 0) {
-	    warning("%s", path);
+	    /* 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;
 	}
-	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;
-	}
+#endif /* STATIC_SUDOERS_PLUGIN */
 
-	/* Open plugin and map in symbol */
-	handle = dlopen(path, RTLD_LAZY|RTLD_GLOBAL);
-	if (!handle) {
-	    warningx(_("unable to dlopen %s: %s"), path, dlerror());
+	len = snprintf(fullpath, pathsize, "%s%s", _PATH_SUDO_PLUGIN_DIR,
+	    info->path);
+	if (len <= 0 || (size_t)len >= pathsize) {
+	    warningx(U_("error in %s, line %d while loading plugin `%s'"),
+		_PATH_SUDO_CONF, info->lineno, info->symbol_name);
+	    warningx(U_("%s%s: %s"), _PATH_SUDO_PLUGIN_DIR, info->path,
+		strerror(ENAMETOOLONG));
 	    goto done;
 	}
-	plugin = dlsym(handle, info->symbol_name);
-	if (!plugin) {
-	    warningx(_("%s: unable to find symbol %s"), path,
-		info->symbol_name);
-	    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;
+	    }
 	}
+# 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;
 
-	if (plugin->type != SUDO_POLICY_PLUGIN && plugin->type != SUDO_IO_PLUGIN) {
-	    warningx(_("%s: unknown policy type %d"), path, plugin->type);
-	    goto done;
+		slpath[len - 1] = 'l';
+		info->path = slpath;
+		status = sudo_stat_plugin(info, fullpath, pathsize, sb);
+		if (status == 0) {
+		    efree((void *)sopath);
+		} else {
+		    efree(slpath);
+		    info->path = sopath;
+		    errno = serrno;
+		}
+	    }
 	}
-	if (SUDO_API_VERSION_GET_MAJOR(plugin->version) != SUDO_API_VERSION_MAJOR) {
-	    warningx(_("%s: incompatible policy major version %d, expected %d"),
-		path, SUDO_API_VERSION_GET_MAJOR(plugin->version),
-		SUDO_API_VERSION_MAJOR);
-	    goto done;
-	}
-	if (plugin->type == SUDO_POLICY_PLUGIN) {
-	    if (policy_plugin->handle) {
-		warningx(_("%s: only a single policy plugin may be loaded"),
-		    _PATH_SUDO_CONF);
+# endif /* __hpux */
+    }
+done:
+    debug_return_int(status);
+}
+
+static bool
+sudo_check_plugin(struct plugin_info *info, char *fullpath, size_t pathsize)
+{
+    struct stat sb;
+    int rval = false;
+    debug_decl(sudo_check_plugin, SUDO_DEBUG_PLUGIN)
+
+    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;
+
+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 plugin specified by "info".
+ */
+static bool
+sudo_load_plugin(struct plugin_container *policy_plugin,
+    struct plugin_container_list *io_plugins, struct plugin_info *info)
+{
+    struct plugin_container *container;
+    struct generic_plugin *plugin;
+    char path[PATH_MAX];
+    bool rval = false;
+    void *handle;
+    debug_decl(sudo_load_plugin, SUDO_DEBUG_PLUGIN)
+
+    /* Sanity check plugin and fill in path */
+    if (!sudo_check_plugin(info, path, sizeof(path)))
+	goto done;
+
+    /* Open plugin and map in symbol */
+    handle = sudo_dso_load(path, SUDO_DSO_LAZY|SUDO_DSO_GLOBAL);
+    if (!handle) {
+	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;
 	    }
+	    warningx(U_("ignoring duplicate policy plugin `%s' in %s, line %d"),
+		info->symbol_name, _PATH_SUDO_CONF, info->lineno);
+	    sudo_dso_unload(handle);
+	    handle = NULL;
+	}
+	if (handle != NULL) {
 	    policy_plugin->handle = handle;
 	    policy_plugin->name = info->symbol_name;
 	    policy_plugin->options = info->options;
 	    policy_plugin->u.generic = plugin;
-	} else if (plugin->type == SUDO_IO_PLUGIN) {
+	}
+    } else if (plugin->type == SUDO_IO_PLUGIN) {
+	/* Check for duplicate entries. */
+	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 (handle != NULL) {
 	    container = ecalloc(1, sizeof(*container));
-	    container->prev = container;
-	    /* container->next = NULL; */
 	    container->handle = handle;
 	    container->name = info->symbol_name;
 	    container->options = info->options;
 	    container->u.generic = plugin;
-	    tq_append(io_plugins, container);
+	    TAILQ_INSERT_TAIL(io_plugins, container, entries);
 	}
     }
+
+    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();
+    TAILQ_FOREACH(info, plugins, entries) {
+	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) {
-	warningx(_("%s: at least one policy plugin must be specified"),
-	    _PATH_SUDO_CONF);
-	goto done;
+	/* 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;
+
+	/* Default I/O plugin */
+	if (TAILQ_EMPTY(io_plugins)) {
+	    info = ecalloc(1, sizeof(*info));
+	    info->symbol_name = "sudoers_io";
+	    info->path = SUDOERS_PLUGIN;
+	    /* info->options = NULL; */
+	    rval = sudo_load_plugin(policy_plugin, io_plugins, info);
+	    efree(info);
+	    if (!rval)
+		goto done;
+	}
     }
     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);
+	rval = false;
 	goto done;
     }
 
@@ -159,13 +326,13 @@ sudo_load_plugins(struct plugin_container *policy_plug
     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) {
+    }
+    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);
 	}
     }
-
-    rval = true;
 
 done:
     debug_return_bool(rval);