/mandos/release : revision 105

65

#include <errno.h> /* errno, EBADF */

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#define BUFFER_SIZE 256

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#define PDIR "/lib/mandos/plugins.d"

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#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"

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#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"

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const char *argp_program_version = "plugin-runner 1.0";

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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

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struct plugin;

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typedef struct plugin{

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char *name; /* can be NULL or any plugin name */

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char **argv;

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int argc;

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char **environ;

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int envc;

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bool disabled;

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/* Variables used for running processes*/

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struct process;

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typedef struct process{

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pid_t pid;

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int fd;

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char *buffer;

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bool eof;

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volatile bool completed;

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volatile int status;

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struct process *next;

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} process;

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typedef struct plugin{

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char *name; /* can be NULL or any plugin name */

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char **argv;

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int argc;

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char **environ;

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int envc;

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bool disabled;

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struct plugin *next;

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} plugin;

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static plugin *plugin_list = NULL;

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

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static plugin *getplugin(char *name, plugin **plugin_list){

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

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if ((p->name == name)

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or (p->name and name and (strcmp(p->name, name) == 0))){

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return p;

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

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.argc = 1,

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.envc = 0,

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.disabled = false,

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.next = plugin_list };

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.next = *plugin_list };

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new_plugin->argv = malloc(sizeof(char *) * 2);

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if (new_plugin->argv == NULL){

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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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*plugin_list = new_plugin;

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return new_plugin;

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}

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}

180

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/* Add to a plugin's environment */

182

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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178

if(p == NULL){

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179

return false;

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180

}

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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 */

192

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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/*

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* Based on the example in the GNU LibC manual chapter 13.13 "File

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* Descriptor Flags".

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return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);

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}

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process *process_list = NULL;

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/* Mark processes as completed when they exit, and save their exit

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status. */

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void handle_sigchld(__attribute__((unused)) int sig){

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while(true){

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plugin *proc = plugin_list;

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process *proc = process_list;

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int status;

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pid_t pid = waitpid(-1, &status, WNOHANG);

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if(pid == 0){

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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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}

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}

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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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236

ssize_t ret;

237

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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return true;

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}

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/* Removes and free a plugin from the plugin list */

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static void free_plugin(plugin *plugin_node){

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for(char **arg = plugin_node->argv; *arg != NULL; arg++){

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free(*arg);

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}

274

free(plugin_node->argv);

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for(char **env = plugin_node->environ; *env != NULL; env++){

276

free(*env);

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}

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free(plugin_node->environ);

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free(plugin_node->buffer);

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/* Removes the plugin from the singly-linked list */

282

if(plugin_node == plugin_list){

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/* First one - simple */

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plugin_list = plugin_list->next;

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} else {

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/* Second one or later */

287

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

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if(p->next == plugin_node){

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p->next = plugin_node->next;

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break;

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}

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char **add_to_argv(char **argv, int *argc, char *arg){

251

if (argv == NULL){

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*argc = 1;

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argv = malloc(sizeof(char*) * 2);

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if(argv == NULL){

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return NULL;

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}

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}

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free(plugin_node);

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argv[0] = NULL; /* Will be set to argv[0] in main before

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parsing */

259

argv[1] = NULL;

260

}

261

*argc += 1;

262

argv = realloc(argv, sizeof(char *)

263

* ((unsigned int) *argc + 1));

264

if(argv == NULL){

265

return NULL;

266

}

267

argv[*argc-1] = arg;

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argv[*argc] = NULL;

269

return argv;

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}

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271

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static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

272

static void free_plugin_list(plugin *plugin_list){

273

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

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next = plugin_list->next;

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for(char **arg = plugin_list->argv; *arg != NULL; arg++){

276

free(*arg);

277

}

278

free(plugin_list->argv);

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for(char **env = plugin_list->environ; *env != NULL; env++){

280

free(*env);

281

}

282

free(plugin_list->environ);

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free(plugin_list);

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284

}

302

285

}

303

286

304

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int main(int argc, char *argv[]){

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char *plugindir = NULL;

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char *argfile = NULL;

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const char *plugindir = "/lib/mandos/plugins.d";

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const char *argfile = ARGFILE;

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FILE *conffp;

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size_t d_name_len;

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DIR *dir = NULL;

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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 },

356

{ .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 },

362

{ .name = "config-file", .key = 129,

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.arg = "FILE",

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.doc = "Specify a different configuration file", .group = 2 },

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{ .name = "userid", .key = 130,

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.arg = "ID", .flags = 0,

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.doc = "User ID the plugins will run as", .group = 3 },

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{ .name = "groupid", .key = 131,

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.arg = "ID", .flags = 0,

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.doc = "Group ID the plugins will run as", .group = 3 },

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{ .name = "debug", .key = 132,

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.doc = "Debug mode", .group = 4 },

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{ .name = "userid", .key = 129,

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.arg = "ID", .flags = 0,

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.doc = "User ID the plugins will run as", .group = 2 },

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{ .name = "groupid", .key = 130,

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.arg = "ID", .flags = 0,

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.doc = "Group ID the plugins will run as", .group = 2 },

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{ .name = "debug", .key = 131,

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.doc = "Debug mode", .group = 3 },

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{ .name = NULL }

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};

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376

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

377

struct argp_state *state) {

353

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

354

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

355

pointer to our plugin list pointer. */

356

plugin **plugins = state->input;

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357

switch (key) {

379

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

358

case 'g':

380

359

if (arg != NULL){

381

360

char *p;

382

361

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

383

362

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

384

363

continue;

385

364

}

386

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

365

if(not add_argument(getplugin(NULL, plugins), p)){

387

366

perror("add_argument");

388

367

return ARGP_ERR_UNKNOWN;

389

368

}

390

369

}

391

370

}

392

371

break;

393

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

372

case 'e':

394

373

if(arg == NULL){

395

374

break;

396

375

}

397

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

398

perror("add_environment");

376

{

377

char *envdef = strdup(arg);

378

if(envdef == NULL){

379

break;

380

}

381

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

382

perror("add_environment");

383

}

399

384

}

400

385

break;

401

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

386

case 'o':

402

387

if (arg != NULL){

403

388

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

404

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

389

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

405

390

break;

406

391

}

407

392

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

408

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

393

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

409

394

break;

410

395

}

411

char *p;

412

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

413

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

414

continue;

415

}

416

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

417

perror("add_argument");

418

return ARGP_ERR_UNKNOWN;

396

if(opt != NULL){

397

char *p;

398

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

399

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

400

continue;

401

}

402

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

403

perror("add_argument");

404

return ARGP_ERR_UNKNOWN;

405

}

419

406

}

420

407

}

421

408

}

422

409

break;

423

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

410

case 'f':

424

411

if(arg == NULL){

425

412

break;

426

413

}

429

416

if(envdef == NULL){

430

417

break;

431

418

}

432

*envdef = '\0';

433

if(not add_environment(getplugin(arg), envdef+1, true)){

419

char *p_name = strndup(arg, (size_t) (envdef-arg));

420

if(p_name == NULL){

421

break;

422

}

423

envdef++;

424

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

434

425

perror("add_environment");

435

426

}

436

427

}

437

428

break;

438

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

429

case 'd':

439

430

if (arg != NULL){

440

plugin *p = getplugin(arg);

431

plugin *p = getplugin(arg, plugins);

441

432

if(p == NULL){

442

433

return ARGP_ERR_UNKNOWN;

443

434

}

444

435

p->disabled = true;

445

436

}

446

437

break;

447

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

448

if (arg != NULL){

449

plugin *p = getplugin(arg);

450

if(p == NULL){

451

return ARGP_ERR_UNKNOWN;

452

}

453

p->disabled = false;

454

}

455

break;

456

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

457

free(plugindir);

458

plugindir = strdup(arg);

459

if(plugindir == NULL){

460

perror("strdup");

461

}

462

break;

463

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

464

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

465

break;

466

case 130: /* --userid */

438

case 128:

439

plugindir = arg;

440

break;

441

case 129:

467

442

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

468

443

break;

469

case 131: /* --groupid */

444

case 130:

470

445

gid = (gid_t)strtol(arg, NULL, 10);

471

446

break;

472

case 132: /* --debug */

447

case 131:

473

448

debug = true;

474

449

break;

475

450

case ARGP_KEY_ARG:

476

/* Cryptsetup always passes an argument, which is an empty

477

string if "none" was specified in /etc/crypttab. So if

478

argument was empty, we ignore it silently. */

479

if(arg[0] != '\0'){

480

fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);

481

}

482

break;

483

case ARGP_KEY_END:

484

break;

485

default:

486

return ARGP_ERR_UNKNOWN;

487

}

488

return 0;

489

}

490

491

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

492

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

493

error_t parse_opt_config_file (int key, char *arg,

494

__attribute__((unused))

495

struct argp_state *state) {

496

switch (key) {

497

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

498

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

499

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

500

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

501

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

502

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

503

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

504

break;

505

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

506

free(argfile);

507

argfile = strdup(arg);

508

if(argfile == NULL){

509

perror("strdup");

510

}

511

break;

512

case 130: /* --userid */

513

case 131: /* --groupid */

514

case 132: /* --debug */

515

case ARGP_KEY_ARG:

516

case ARGP_KEY_END:

517

break;

518

default:

519

return ARGP_ERR_UNKNOWN;

520

}

521

return 0;

522

}

523

524

struct argp argp = { .options = options,

525

.parser = parse_opt_config_file,

526

.args_doc = "",

451

fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);

452

break;

453

case ARGP_KEY_END:

454

break;

455

default:

456

return ARGP_ERR_UNKNOWN;

457

}

458

return 0;

459

}

460

461

plugin *plugin_list = NULL;

462

463

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

464

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

527

465

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

528

466

529

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

530

config file location, if any. */

531

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

467

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

532

468

if (ret == ARGP_ERR_UNKNOWN){

533

469

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

534

470

exitstatus = EXIT_FAILURE;

535

471

goto fallback;

536

472

}

537

538

/* Reset to the normal argument parser */

539

argp.parser = parse_opt;

540

541

/* Open the configfile if available */

542

if (argfile == NULL){

543

conffp = fopen(AFILE, "r");

544

} else {

545

conffp = fopen(argfile, "r");

546

}

473

474

conffp = fopen(argfile, "r");

547

475

if(conffp != NULL){

548

476

char *org_line = NULL;

549

477

char *p, *arg, *new_arg, *line;

552

480

const char whitespace_delims[] = " \r\t\f\v\n";

553

481

const char comment_delim[] = "#";

554

482

555

custom_argc = 1;

556

custom_argv = malloc(sizeof(char*) * 2);

557

if(custom_argv == NULL){

558

perror("malloc");

559

exitstatus = EXIT_FAILURE;

560

goto fallback;

561

}

562

custom_argv[0] = argv[0];

563

custom_argv[1] = NULL;

564

565

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

566

commented text */

567

483

while(true){

568

484

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

569

485

if(sret == -1){

577

493

continue;

578

494

}

579

495

new_arg = strdup(p);

580

if(new_arg == NULL){

581

perror("strdup");

582

exitstatus = EXIT_FAILURE;

583

free(org_line);

584

goto fallback;

585

}

586

587

custom_argc += 1;

588

custom_argv = realloc(custom_argv, sizeof(char *)

589

* ((unsigned int) custom_argc + 1));

590

if(custom_argv == NULL){

591

perror("realloc");

592

exitstatus = EXIT_FAILURE;

593

free(org_line);

594

goto fallback;

595

}

596

custom_argv[custom_argc-1] = new_arg;

597

custom_argv[custom_argc] = NULL;

496

custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);

497

if (custom_argv == NULL){

498

perror("add_to_argv");

499

exitstatus = EXIT_FAILURE;

500

goto fallback;

501

}

598

502

}

599

503

}

600

504

free(org_line);

601

} else {

505

} else{

602

506

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

603

507

not affect opening plugins */

604

508

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

607

511

goto fallback;

608

512

}

609

513

}

610

/* If there was any arguments from configuration file,

611

pass them to parser as command arguments */

514

612

515

if(custom_argv != NULL){

613

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

614

0, NULL);

516

custom_argv[0] = argv[0];

517

ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,

518

&plugin_list);

615

519

if (ret == ARGP_ERR_UNKNOWN){

616

520

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

617

521

exitstatus = EXIT_FAILURE;

619

523

}

620

524

}

621

525

622

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

623

config file */

624

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

625

if (ret == ARGP_ERR_UNKNOWN){

626

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

627

exitstatus = EXIT_FAILURE;

628

goto fallback;

629

}

630

631

526

if(debug){

632

527

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

633

528

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

642

537

}

643

538

}

644

539

645

/* Strip permissions down to nobody */

646

540

ret = setuid(uid);

647

541

if (ret == -1){

648

542

perror("setuid");

649

}

543

}

544

650

545

setgid(gid);

651

546

if (ret == -1){

652

547

perror("setgid");

653

548

}

654

549

655

if (plugindir == NULL){

656

dir = opendir(PDIR);

657

} else {

658

dir = opendir(plugindir);

659

}

660

550

dir = opendir(plugindir);

661

551

if(dir == NULL){

662

552

perror("Could not open plugin dir");

663

553

exitstatus = EXIT_FAILURE;

679

569

680

570

FD_ZERO(&rfds_all);

681

571

682

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

683

572

while(true){

684

573

dirst = readdir(dir);

685

574

686

/* All directory entries have been processed */

575

// All directory entries have been processed

687

576

if(dirst == NULL){

688

577

if (errno == EBADF){

689

578

perror("readdir");

695

584

696

585

d_name_len = strlen(dirst->d_name);

697

586

698

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

587

// Ignore dotfiles, backup files and other junk

699

588

{

700

589

bool bad_name = false;

701

590

716

605

break;

717

606

}

718

607

}

608

719

609

if(bad_name){

720

610

continue;

721

611

}

612

722

613

for(const char **suf = bad_suffixes; *suf != NULL; suf++){

723

614

size_t suf_len = strlen(*suf);

724

615

if((d_name_len >= suf_len)

739

630

}

740

631

741

632

char *filename;

742

if(plugindir == NULL){

743

ret = asprintf(&filename, PDIR "/%s", dirst->d_name);

744

} else {

745

ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);

746

}

633

ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);

747

634

if(ret < 0){

748

635

perror("asprintf");

749

636

continue;

755

642

free(filename);

756

643

continue;

757

644

}

758

759

/* Ignore non-executable files */

645

760

646

if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){

761

647

if(debug){

762

648

fprintf(stderr, "Ignoring plugin dir entry \"%s\""

765

651

free(filename);

766

652

continue;

767

653

}

768

769

plugin *p = getplugin(dirst->d_name);

654

plugin *p = getplugin(dirst->d_name, &plugin_list);

770

655

if(p == NULL){

771

656

perror("getplugin");

772

657

free(filename);

782

667

}

783

668

{

784

669

/* Add global arguments to argument list for this plugin */

785

plugin *g = getplugin(NULL);

670

plugin *g = getplugin(NULL, &plugin_list);

786

671

if(g != NULL){

787

672

for(char **a = g->argv + 1; *a != NULL; a++){

788

673

if(not add_argument(p, *a)){

791

676

}

792

677

/* Add global environment variables */

793

678

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

794

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

679

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

795

680

perror("add_environment");

796

681

}

797

682

}

802

687

process, too. */

803

688

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

804

689

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

805

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

690

char *copy = strdup(*e);

691

if(copy == NULL){

692

perror("strdup");

693

continue;

694

}

695

if(not add_environment(p, copy)){

806

696

perror("add_environment");

807

697

}

808

698

}

815

705

exitstatus = EXIT_FAILURE;

816

706

goto fallback;

817

707

}

818

/* Ask OS to automatic close the pipe on exec */

819

708

ret = set_cloexec_flag(pipefd[0]);

820

709

if(ret < 0){

821

710

perror("set_cloexec_flag");

835

724

exitstatus = EXIT_FAILURE;

836

725

goto fallback;

837

726

}

838

/* Starting a new process to be watched */

727

// Starting a new process to be watched

839

728

pid_t pid = fork();

840

729

if(pid == -1){

841

730

perror("fork");

879

768

}

880

769

/* no return */

881

770

}

882

/* Parent process */

883

close(pipefd[1]); /* Close unused write end of pipe */

771

/* parent process */

884

772

free(filename);

885

plugin *new_plugin = getplugin(dirst->d_name);

886

if (new_plugin == NULL){

887

perror("getplugin");

773

close(pipefd[1]); /* close unused write end of pipe */

774

process *new_process = malloc(sizeof(process));

775

if (new_process == NULL){

776

perror("malloc");

888

777

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);

889

778

if(ret < 0){

890

perror("sigprocmask");

779

perror("sigprocmask");

891

780

}

892

781

exitstatus = EXIT_FAILURE;

893

782

goto fallback;

894

783

}

895

784

896

new_plugin->pid = pid;

897

new_plugin->fd = pipefd[0];

898

785

*new_process = (struct process){ .pid = pid,

786

.fd = pipefd[0],

787

.next = process_list };

788

// List handling

789

process_list = new_process;

899

790

/* Unblock SIGCHLD so signal handler can be run if this process

900

791

has already completed */

901

792

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);

905

796

goto fallback;

906

797

}

907

798

908

FD_SET(new_plugin->fd, &rfds_all);

799

FD_SET(new_process->fd, &rfds_all);

909

800

910

if (maxfd < new_plugin->fd){

911

maxfd = new_plugin->fd;

801

if (maxfd < new_process->fd){

802

maxfd = new_process->fd;

912

803

}

913

804

914

805

}

915

806

807

free_plugin_list(plugin_list);

808

plugin_list = NULL;

809

916

810

closedir(dir);

917

811

dir = NULL;

918

919

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

920

if(p->pid != 0){

921

break;

922

}

923

if(p->next == NULL){

924

fprintf(stderr, "No plugin processes started. Incorrect plugin"

925

" directory?\n");

926

free_plugin_list();

927

}

812

813

if (process_list == NULL){

814

fprintf(stderr, "No plugin processes started. Incorrect plugin"

815

" directory?\n");

816

process_list = NULL;

928

817

}

929

930

/* Main loop while running plugins exist */

931

while(plugin_list){

818

while(process_list){

932

819

fd_set rfds = rfds_all;

933

820

int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);

934

821

if (select_ret == -1){

938

825

}

939

826

/* OK, now either a process completed, or something can be read

940

827

from one of them */

941

for(plugin *proc = plugin_list; proc != NULL;){

828

for(process *proc = process_list; proc ; proc = proc->next){

942

829

/* Is this process completely done? */

943

830

if(proc->eof and proc->completed){

944

831

/* Only accept the plugin output if it exited cleanly */

945

832

if(not WIFEXITED(proc->status)

946

833

or WEXITSTATUS(proc->status) != 0){

947

834

/* Bad exit by plugin */

948

949

835

if(debug){

950

836

if(WIFEXITED(proc->status)){

951

837

fprintf(stderr, "Plugin %u exited with status %d\n",

960

846

(unsigned int) (proc->pid));

961

847

}

962

848

}

963

964

849

/* Remove the plugin */

965

850

FD_CLR(proc->fd, &rfds_all);

966

967

851

/* Block signal while modifying process_list */

968

852

ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);

969

853

if(ret < 0){

971

855

exitstatus = EXIT_FAILURE;

972

856

goto fallback;

973

857

}

974

858

/* Delete this process entry from the list */

859

if(process_list == proc){

860

/* First one - simple */

861

process_list = proc->next;

862

} else {

863

/* Second one or later */

864

for(process *p = process_list; p != NULL; p = p->next){

865

if(p->next == proc){

866

p->next = proc->next;

867

break;

868

}

869

}

870

}

975

871

/* We are done modifying process list, so unblock signal */

976

872

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

977

873

NULL);

978

874

if(ret < 0){

979

875

perror("sigprocmask");

980

exitstatus = EXIT_FAILURE;

981

goto fallback;

982

}

983

984

if(plugin_list == NULL){

985

break;

986

}

987

988

plugin *next_plugin = proc->next;

989

free_plugin(proc);

990

proc = next_plugin;

991

continue;

876

}

877

free(proc->buffer);

878

free(proc);

879

/* We deleted this process from the list, so we can't go

880

proc->next. Therefore, start over from the beginning of

881

the process list */

882

break;

992

883

}

993

994

884

/* This process exited nicely, so print its buffer */

995

885

996

886

bool bret = print_out_password(proc->buffer,

1001

891

}

1002

892

goto fallback;

1003

893

}

1004

1005

894

/* This process has not completed. Does it have any output? */

1006

895

if(proc->eof or not FD_ISSET(proc->fd, &rfds)){

1007

896

/* This process had nothing to say at this time */

1008

proc = proc->next;

1009

897

continue;

1010

898

}

1011

899

/* Before reading, make the process' data buffer large enough */

1024

912

BUFFER_SIZE);

1025

913

if(ret < 0){

1026

914

/* Read error from this process; ignore the error */

1027

proc = proc->next;

1028

915

continue;

1029

916

}

1030

917

if(ret == 0){

1039

926

1040

927

fallback:

1041

928

1042

if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){

929

if(process_list == NULL or exitstatus != EXIT_SUCCESS){

1043

930

/* Fallback if all plugins failed, none are found or an error

1044

931

occured */

1045

932

bool bret;

1046

933

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

1047

934

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

1048

size_t len = strlen(passwordbuffer);

1049

/* Strip trailing newline */

1050

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

1051

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

1052

len--;

1053

}

1054

bret = print_out_password(passwordbuffer, len);

935

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

1055

936

if(not bret){

1056

937

perror("print_out_password");

1057

938

exitstatus = EXIT_FAILURE;

1066

947

}

1067

948

1068

949

if(custom_argv != NULL){

1069

for(char **arg = custom_argv+1; *arg != NULL; arg++){

950

for(char **arg = custom_argv; *arg != NULL; arg++){

1070

951

free(*arg);

1071

952

}

1072

953

free(custom_argv);

1073

954

}

955

free_plugin_list(plugin_list);

1074

956

1075

957

if(dir != NULL){

1076

958

closedir(dir);

1077

959

}

1078

960

1079

961

/* Free the process list and kill the processes */

1080

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

1081

if(p->pid != 0){

1082

close(p->fd);

1083

ret = kill(p->pid, SIGTERM);

1084

if(ret == -1 and errno != ESRCH){

1085

/* Set-uid proccesses might not get closed */

1086

perror("kill");

1087

}

962

for(process *next; process_list != NULL; process_list = next){

963

next = process_list->next;

964

close(process_list->fd);

965

ret = kill(process_list->pid, SIGTERM);

966

if(ret == -1 and errno != ESRCH){

967

/* set-uid proccesses migth not get closed */

968

perror("kill");

1088

969

}

970

free(process_list->buffer);

971

free(process_list);

1089

972

}

1090

973

1091

974

/* Wait for any remaining child processes to terminate */

1095

978

if(errno != ECHILD){

1096

979

perror("wait");

1097

980

}

1098

1099

free_plugin_list();

1100

1101

free(plugindir);

1102

free(argfile);

1103

981

1104

982

return exitstatus;

1105

983

}