/mandos/trunk : revision 132

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static plugin *plugin_list = NULL;

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/* Gets an existing plugin based on name,

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/* Gets a existing plugin based on name,

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or if none is found, creates a new one */

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static plugin *getplugin(char *name){

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/* Check for exiting plugin with that name */

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return NULL;

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}

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}

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*new_plugin = (plugin) { .name = copy_name,

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.argc = 1,

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.disabled = false,

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}

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new_plugin->argv[0] = copy_name;

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new_plugin->argv[1] = NULL;

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new_plugin->environ = malloc(sizeof(char *));

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if(new_plugin->environ == NULL){

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free(copy_name);

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return NULL;

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}

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new_plugin->environ[0] = NULL;

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/* Append the new plugin to the list */

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plugin_list = new_plugin;

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return new_plugin;

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}

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/* Add to a plugin's environment */

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static bool add_environment(plugin *p, const char *def, bool replace){

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static bool add_environment(plugin *p, const char *def){

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if(p == NULL){

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return false;

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}

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/* namelen = length of name of environment variable */

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size_t namelen = (size_t)(strchrnul(def, '=') - def);

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/* Search for this environment variable */

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for(char **e = p->environ; *e != NULL; e++){

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if(strncmp(*e, def, namelen + 1) == 0){

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/* It already exists */

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if(replace){

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char *new = realloc(*e, strlen(def) + 1);

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if(new == NULL){

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return false;

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}

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*e = new;

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strcpy(*e, def);

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}

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return true;

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}

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}

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return add_to_char_array(def, &(p->environ), &(p->envc));

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}

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/* No child processes */

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break;

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}

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/* A child exited, find it in process_list */

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while(proc != NULL and proc->pid != pid){

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proc = proc->next;

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/* Prints out a password to stdout */

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bool print_out_password(const char *buffer, size_t length){

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ssize_t ret;

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if(length>0 and buffer[length-1] == '\n'){

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length--;

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}

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for(size_t written = 0; written < length; written += (size_t)ret){

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ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,

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length - written));

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{ .name = "global-options", .key = 'g',

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.arg = "OPTION[,OPTION[,...]]",

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.doc = "Options passed to all plugins" },

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{ .name = "global-env", .key = 'G',

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{ .name = "global-envs", .key = 'e',

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.arg = "VAR=value",

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.doc = "Environment variable passed to all plugins" },

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{ .name = "options-for", .key = 'o',

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.arg = "PLUGIN:OPTION[,OPTION[,...]]",

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.doc = "Options passed only to specified plugin" },

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{ .name = "env-for", .key = 'E',

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{ .name = "envs-for", .key = 'f',

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.arg = "PLUGIN:ENV=value",

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.doc = "Environment variable passed to specified plugin" },

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{ .name = "disable", .key = 'd',

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.arg = "PLUGIN",

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.doc = "Disable a specific plugin", .group = 1 },

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{ .name = "enable", .key = 'e',

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.arg = "PLUGIN",

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.doc = "Enable a specific plugin", .group = 1 },

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{ .name = "plugin-dir", .key = 128,

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.arg = "DIRECTORY",

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.doc = "Specify a different plugin directory", .group = 2 },

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{ .name = NULL }

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};

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error_t parse_opt (int key, char *arg, __attribute__((unused))

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struct argp_state *state) {

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error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {

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/* Get the INPUT argument from `argp_parse', which we know is a

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pointer to our plugin list pointer. */

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switch (key) {

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case 'g': /* --global-options */

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if (arg != NULL){

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}

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}

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break;

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case 'G': /* --global-env */

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case 'e': /* --global-envs */

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if(arg == NULL){

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break;

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}

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if(envdef == NULL){

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break;

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}

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if(not add_environment(getplugin(NULL), envdef, true)){

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if(not add_environment(getplugin(NULL), envdef)){

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perror("add_environment");

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}

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}

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case 'o': /* --options-for */

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if (arg != NULL){

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char *p_name = strsep(&arg, ":");

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if(p_name[0] == '\0' or arg == NULL){

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if(p_name[0] == '\0'){

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break;

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}

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char *opt = strsep(&arg, ":");

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if(opt[0] == '\0' or opt == NULL){

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if(opt[0] == '\0'){

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break;

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}

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char *p;

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while((p = strsep(&opt, ",")) != NULL){

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if(p[0] == '\0'){

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continue;

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}

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if(not add_argument(getplugin(p_name), p)){

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perror("add_argument");

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return ARGP_ERR_UNKNOWN;

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if(opt != NULL){

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char *p;

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while((p = strsep(&opt, ",")) != NULL){

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if(p[0] == '\0'){

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continue;

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}

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if(not add_argument(getplugin(p_name), p)){

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perror("add_argument");

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return ARGP_ERR_UNKNOWN;

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}

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}

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}

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}

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break;

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case 'E': /* --env-for */

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case 'f': /* --envs-for */

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if(arg == NULL){

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break;

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}

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break;

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}

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envdef++;

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if(not add_environment(getplugin(p_name), envdef, true)){

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if(not add_environment(getplugin(p_name), envdef)){

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perror("add_environment");

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}

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}

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p->disabled = true;

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}

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break;

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case 'e': /* --enable */

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if (arg != NULL){

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plugin *p = getplugin(arg);

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if(p == NULL){

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return ARGP_ERR_UNKNOWN;

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}

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p->disabled = false;

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}

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break;

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case 128: /* --plugin-dir */

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plugindir = strdup(arg);

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if(plugindir == NULL){

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}

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break;

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case 129: /* --config-file */

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/* This is already done by parse_opt_config_file() */

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break;

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argfile = strdup(arg);

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if(argfile == NULL){

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perror("strdup");

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}

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break;

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case 130: /* --userid */

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uid = (uid_t)strtol(arg, NULL, 10);

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break;

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return 0;

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}

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/* This option parser is the same as parse_opt() above, except it

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ignores everything but the --config-file option. */

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error_t parse_opt_config_file (int key, char *arg,

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__attribute__((unused))

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struct argp_state *state) {

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switch (key) {

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case 'g': /* --global-options */

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case 'G': /* --global-env */

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case 'o': /* --options-for */

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case 'E': /* --env-for */

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case 'd': /* --disable */

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case 'e': /* --enable */

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case 128: /* --plugin-dir */

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break;

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case 129: /* --config-file */

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argfile = strdup(arg);

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if(argfile == NULL){

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perror("strdup");

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}

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break;

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case 130: /* --userid */

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case 131: /* --groupid */

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case 132: /* --debug */

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case ARGP_KEY_ARG:

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case ARGP_KEY_END:

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break;

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default:

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return ARGP_ERR_UNKNOWN;

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}

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return 0;

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}

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struct argp argp = { .options = options,

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.parser = parse_opt_config_file,

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.args_doc = "",

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struct argp argp = { .options = options, .parser = parse_opt,

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.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

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477

.doc = "Mandos plugin runner -- Run plugins" };

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/* Parse using the parse_opt_config_file in order to get the custom

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config file location, if any. */

534

ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);

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ret = argp_parse (&argp, argc, argv, 0, 0, NULL);

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if (ret == ARGP_ERR_UNKNOWN){

536

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fprintf(stderr, "Unknown error while parsing arguments\n");

537

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exitstatus = EXIT_FAILURE;

538

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goto fallback;

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}

540

541

/* Reset to the normal argument parser */

542

argp.parser = parse_opt;

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/* Open the configfile if available */

485

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/* Opens the configfile if aviable */

545

487

if (argfile == NULL){

546

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conffp = fopen(AFILE, "r");

547

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} else {

565

507

custom_argv[0] = argv[0];

566

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custom_argv[1] = NULL;

567

509

568

/* for each line in the config file, strip whitespace and ignore

569

commented text */

510

/* for each line in the config file, strip whitespace and ignore commented text */

570

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while(true){

571

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sret = getline(&org_line, &size, conffp);

572

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if(sret == -1){

601

542

}

602

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}

603

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free(org_line);

604

} else {

545

} else{

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/* Check for harmful errors and go to fallback. Other errors might

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not affect opening plugins */

607

548

if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){

613

554

/* If there was any arguments from configuration file,

614

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pass them to parser as command arguments */

615

556

if(custom_argv != NULL){

616

ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,

617

0, NULL);

557

ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);

618

558

if (ret == ARGP_ERR_UNKNOWN){

619

559

fprintf(stderr, "Unknown error while parsing arguments\n");

620

560

exitstatus = EXIT_FAILURE;

622

562

}

623

563

}

624

564

625

/* Parse actual command line arguments, to let them override the

626

config file */

627

ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);

628

if (ret == ARGP_ERR_UNKNOWN){

629

fprintf(stderr, "Unknown error while parsing arguments\n");

630

exitstatus = EXIT_FAILURE;

631

goto fallback;

632

}

633

634

565

if(debug){

635

566

for(plugin *p = plugin_list; p != NULL; p=p->next){

636

567

fprintf(stderr, "Plugin: %s has %d arguments\n",

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}

645

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}

646

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}

647

578

648

579

/* Strip permissions down to nobody */

649

580

ret = setuid(uid);

650

581

if (ret == -1){

654

585

if (ret == -1){

655

586

perror("setgid");

656

587

}

657

588

658

589

if (plugindir == NULL){

659

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dir = opendir(PDIR);

660

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} else {

681

612

}

682

613

683

614

FD_ZERO(&rfds_all);

684

615

685

616

/* Read and execute any executable in the plugin directory*/

686

617

while(true){

687

618

dirst = readdir(dir);

688

619

689

/* All directory entries have been processed */

620

// All directory entries have been processed

690

621

if(dirst == NULL){

691

622

if (errno == EBADF){

692

623

perror("readdir");

698

629

699

630

d_name_len = strlen(dirst->d_name);

700

631

701

/* Ignore dotfiles, backup files and other junk */

632

// Ignore dotfiles, backup files and other junk

702

633

{

703

634

bool bad_name = false;

704

635

790

721

}

791

722

/* Add global environment variables */

792

723

for(char **e = g->environ; *e != NULL; e++){

793

if(not add_environment(p, *e, false)){

724

if(not add_environment(p, *e)){

794

725

perror("add_environment");

795

726

}

796

727

}

801

732

process, too. */

802

733

if(p->environ[0] != NULL){

803

734

for(char **e = environ; *e != NULL; e++){

804

if(not add_environment(p, *e, false)){

735

char *copy = strdup(*e);

736

if(copy == NULL){

737

perror("strdup");

738

continue;

739

}

740

if(not add_environment(p, copy)){

805

741

perror("add_environment");

806

742

}

807

743

}

834

770

exitstatus = EXIT_FAILURE;

835

771

goto fallback;

836

772

}

837

/* Starting a new process to be watched */

773

// Starting a new process to be watched

838

774

pid_t pid = fork();

839

775

if(pid == -1){

840

776

perror("fork");

1038

974

bool bret;

1039

975

fprintf(stderr, "Going to fallback mode using getpass(3)\n");

1040

976

char *passwordbuffer = getpass("Password: ");

1041

size_t len = strlen(passwordbuffer);

1042

/* Strip trailing newline */

1043

if(len > 0 and passwordbuffer[len-1] == '\n'){

1044

passwordbuffer[len-1] = '\0'; /* not strictly necessary */

1045

len--;

1046

}

1047

bret = print_out_password(passwordbuffer, len);

977

bret = print_out_password(passwordbuffer, strlen(passwordbuffer));

1048

978

if(not bret){

1049

979

perror("print_out_password");

1050

980

exitstatus = EXIT_FAILURE;