/mandos/trunk : revision 174

65

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

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#define BUFFER_SIZE 256

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

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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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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 process;

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typedef struct process{

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

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

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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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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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132

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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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}

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/* Add to a plugin's environment */

177

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

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

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183

if(p == NULL){

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return false;

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185

}

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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);

194

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){

206

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while(true){

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process *proc = process_list;

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plugin *proc = plugin_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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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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char **add_to_argv(char **argv, int *argc, char *arg){

251

if (argv == NULL){

252

*argc = 1;

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

254

if(argv == NULL){

255

return NULL;

268

/* 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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}

278

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){

283

/* First one - simple */

284

plugin_list = plugin_list->next;

285

} else {

286

/* Second one or later */

287

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

288

if(p->next == plugin_node){

289

p->next = plugin_node->next;

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break;

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}

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292

}

257

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

258

argv[1] = NULL;

259

}

260

*argc += 1;

261

argv = realloc(argv, sizeof(char *)

262

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

263

if(argv == NULL){

264

return NULL;

265

}

266

argv[*argc-1] = arg;

267

argv[*argc] = NULL;

268

return argv;

293

}

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free(plugin_node);

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}

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static void free_plugin_list(plugin *plugin_list){

272

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

273

next = plugin_list->next;

274

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

275

free(*arg);

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}

277

free(plugin_list->argv);

278

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

279

free(*env);

280

}

281

free(plugin_list->environ);

282

free(plugin_list);

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

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}

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}

285

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

287

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

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const char *argfile = ARGFILE;

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char *plugindir = NULL;

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char *argfile = NULL;

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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-envs", .key = 'e',

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

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

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

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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 },

341

{ .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 },

362

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

363

.arg = "FILE",

364

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

365

{ .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 = NULL }

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374

};

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375

352

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

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

354

pointer to our plugin list pointer. */

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plugin **plugins = state->input;

376

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

377

struct argp_state *state) {

356

378

switch (key) {

357

case 'g':

379

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

358

380

if (arg != NULL){

359

381

char *p;

360

382

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

361

383

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

362

384

continue;

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385

}

364

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

386

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

365

387

perror("add_argument");

366

388

return ARGP_ERR_UNKNOWN;

367

389

}

368

390

}

369

391

}

370

392

break;

371

case 'e':

393

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

372

394

if(arg == NULL){

373

395

break;

374

396

}

377

399

if(envdef == NULL){

378

400

break;

379

401

}

380

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

402

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

381

403

perror("add_environment");

382

404

}

383

405

}

384

406

break;

385

case 'o':

407

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

386

408

if (arg != NULL){

387

409

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

388

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

410

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

389

411

break;

390

412

}

391

413

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

392

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

414

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

393

415

break;

394

416

}

395

if(opt != NULL){

396

char *p;

397

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

398

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

399

continue;

400

}

401

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

402

perror("add_argument");

403

return ARGP_ERR_UNKNOWN;

404

}

417

char *p;

418

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

419

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

420

continue;

421

}

422

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

423

perror("add_argument");

424

return ARGP_ERR_UNKNOWN;

405

425

}

406

426

}

407

427

}

408

428

break;

409

case 'f':

429

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

410

430

if(arg == NULL){

411

431

break;

412

432

}

420

440

break;

421

441

}

422

442

envdef++;

423

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

443

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

424

444

perror("add_environment");

425

445

}

426

446

}

427

447

break;

428

case 'd':

448

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

429

449

if (arg != NULL){

430

plugin *p = getplugin(arg, plugins);

450

plugin *p = getplugin(arg);

431

451

if(p == NULL){

432

452

return ARGP_ERR_UNKNOWN;

433

453

}

434

454

p->disabled = true;

435

455

}

436

456

break;

437

case 128:

438

plugindir = arg;

439

break;

440

case 129:

457

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

458

if (arg != NULL){

459

plugin *p = getplugin(arg);

460

if(p == NULL){

461

return ARGP_ERR_UNKNOWN;

462

}

463

p->disabled = false;

464

}

465

break;

466

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

467

plugindir = strdup(arg);

468

if(plugindir == NULL){

469

perror("strdup");

470

}

471

break;

472

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

473

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

474

break;

475

case 130: /* --userid */

441

476

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

442

477

break;

443

case 130:

478

case 131: /* --groupid */

444

479

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

445

480

break;

446

case 131:

481

case 132: /* --debug */

447

482

debug = true;

448

483

break;

449

484

case ARGP_KEY_ARG:

457

492

return 0;

458

493

}

459

494

460

plugin *plugin_list = NULL;

495

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

496

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

497

error_t parse_opt_config_file (int key, char *arg,

498

__attribute__((unused))

499

struct argp_state *state) {

500

switch (key) {

501

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

502

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

503

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

504

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

505

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

506

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

507

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

508

break;

509

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

510

argfile = strdup(arg);

511

if(argfile == NULL){

512

perror("strdup");

513

}

514

break;

515

case 130: /* --userid */

516

case 131: /* --groupid */

517

case 132: /* --debug */

518

case ARGP_KEY_ARG:

519

case ARGP_KEY_END:

520

break;

521

default:

522

return ARGP_ERR_UNKNOWN;

523

}

524

return 0;

525

}

461

526

462

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

463

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

527

struct argp argp = { .options = options,

528

.parser = parse_opt_config_file,

529

.args_doc = "",

464

530

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

465

531

466

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

532

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

533

config file location, if any. */

534

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

467

535

if (ret == ARGP_ERR_UNKNOWN){

468

536

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

469

537

exitstatus = EXIT_FAILURE;

470

538

goto fallback;

471

539

}

472

473

conffp = fopen(argfile, "r");

540

541

/* Reset to the normal argument parser */

542

argp.parser = parse_opt;

543

544

/* Open the configfile if available */

545

if (argfile == NULL){

546

conffp = fopen(AFILE, "r");

547

} else {

548

conffp = fopen(argfile, "r");

549

}

474

550

if(conffp != NULL){

475

551

char *org_line = NULL;

476

552

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

479

555

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

480

556

const char comment_delim[] = "#";

481

557

558

custom_argc = 1;

559

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

560

if(custom_argv == NULL){

561

perror("malloc");

562

exitstatus = EXIT_FAILURE;

563

goto fallback;

564

}

565

custom_argv[0] = argv[0];

566

custom_argv[1] = NULL;

567

568

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

569

commented text */

482

570

while(true){

483

571

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

484

572

if(sret == -1){

492

580

continue;

493

581

}

494

582

new_arg = strdup(p);

495

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

496

if (custom_argv == NULL){

497

perror("add_to_argv");

498

exitstatus = EXIT_FAILURE;

499

goto fallback;

500

}

583

if(new_arg == NULL){

584

perror("strdup");

585

exitstatus = EXIT_FAILURE;

586

free(org_line);

587

goto fallback;

588

}

589

590

custom_argc += 1;

591

custom_argv = realloc(custom_argv, sizeof(char *)

592

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

593

if(custom_argv == NULL){

594

perror("realloc");

595

exitstatus = EXIT_FAILURE;

596

free(org_line);

597

goto fallback;

598

}

599

custom_argv[custom_argc-1] = new_arg;

600

custom_argv[custom_argc] = NULL;

501

601

}

502

602

}

503

603

free(org_line);

504

} else{

604

} else {

505

605

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

506

606

not affect opening plugins */

507

607

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

510

610

goto fallback;

511

611

}

512

612

}

513

613

/* If there was any arguments from configuration file,

614

pass them to parser as command arguments */

514

615

if(custom_argv != NULL){

515

custom_argv[0] = argv[0];

516

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

616

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

617

0, NULL);

517

618

if (ret == ARGP_ERR_UNKNOWN){

518

619

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

519

620

exitstatus = EXIT_FAILURE;

521

622

}

522

623

}

523

624

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

524

634

if(debug){

525

635

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

526

636

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

535

645

}

536

646

}

537

647

648

/* Strip permissions down to nobody */

538

649

ret = setuid(uid);

539

650

if (ret == -1){

540

651

perror("setuid");

541

}

542

652

}

543

653

setgid(gid);

544

654

if (ret == -1){

545

655

perror("setgid");

546

656

}

547

657

548

dir = opendir(plugindir);

658

if (plugindir == NULL){

659

dir = opendir(PDIR);

660

} else {

661

dir = opendir(plugindir);

662

}

663

549

664

if(dir == NULL){

550

665

perror("Could not open plugin dir");

551

666

exitstatus = EXIT_FAILURE;

567

682

568

683

FD_ZERO(&rfds_all);

569

684

685

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

570

686

while(true){

571

687

dirst = readdir(dir);

572

688

573

// All directory entries have been processed

689

/* All directory entries have been processed */

574

690

if(dirst == NULL){

575

691

if (errno == EBADF){

576

692

perror("readdir");

582

698

583

699

d_name_len = strlen(dirst->d_name);

584

700

585

// Ignore dotfiles, backup files and other junk

701

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

586

702

{

587

703

bool bad_name = false;

588

704

603

719

break;

604

720

}

605

721

}

606

607

722

if(bad_name){

608

723

continue;

609

724

}

610

611

725

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

612

726

size_t suf_len = strlen(*suf);

613

727

if((d_name_len >= suf_len)

628

742

}

629

743

630

744

char *filename;

631

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

745

if(plugindir == NULL){

746

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

747

} else {

748

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

749

}

632

750

if(ret < 0){

633

751

perror("asprintf");

634

752

continue;

640

758

free(filename);

641

759

continue;

642

760

}

643

761

762

/* Ignore non-executable files */

644

763

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

645

764

if(debug){

646

765

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

649

768

free(filename);

650

769

continue;

651

770

}

652

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

771

772

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

653

773

if(p == NULL){

654

774

perror("getplugin");

655

775

free(filename);

665

785

}

666

786

{

667

787

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

668

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

788

plugin *g = getplugin(NULL);

669

789

if(g != NULL){

670

790

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

671

791

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

674

794

}

675

795

/* Add global environment variables */

676

796

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

677

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

797

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

678

798

perror("add_environment");

679

799

}

680

800

}

685

805

process, too. */

686

806

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

687

807

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

688

char *copy = strdup(*e);

689

if(copy == NULL){

690

perror("strdup");

691

continue;

692

}

693

if(not add_environment(p, copy)){

808

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

694

809

perror("add_environment");

695

810

}

696

811

}

703

818

exitstatus = EXIT_FAILURE;

704

819

goto fallback;

705

820

}

821

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

706

822

ret = set_cloexec_flag(pipefd[0]);

707

823

if(ret < 0){

708

824

perror("set_cloexec_flag");

722

838

exitstatus = EXIT_FAILURE;

723

839

goto fallback;

724

840

}

725

// Starting a new process to be watched

841

/* Starting a new process to be watched */

726

842

pid_t pid = fork();

727

843

if(pid == -1){

728

844

perror("fork");

766

882

}

767

883

/* no return */

768

884

}

769

/* parent process */

885

/* Parent process */

886

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

770

887

free(filename);

771

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

772

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

773

if (new_process == NULL){

774

perror("malloc");

888

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

889

if (new_plugin == NULL){

890

perror("getplugin");

775

891

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

776

892

if(ret < 0){

777

perror("sigprocmask");

893

perror("sigprocmask");

778

894

}

779

895

exitstatus = EXIT_FAILURE;

780

896

goto fallback;

781

897

}

782

898

783

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

784

.fd = pipefd[0],

785

.next = process_list };

786

// List handling

787

process_list = new_process;

899

new_plugin->pid = pid;

900

new_plugin->fd = pipefd[0];

901

788

902

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

789

903

has already completed */

790

904

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

794

908

goto fallback;

795

909

}

796

910

797

FD_SET(new_process->fd, &rfds_all);

911

FD_SET(new_plugin->fd, &rfds_all);

798

912

799

if (maxfd < new_process->fd){

800

maxfd = new_process->fd;

913

if (maxfd < new_plugin->fd){

914

maxfd = new_plugin->fd;

801

915

}

802

916

803

917

}

804

918

805

free_plugin_list(plugin_list);

806

plugin_list = NULL;

807

808

919

closedir(dir);

809

920

dir = NULL;

810

811

if (process_list == NULL){

812

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

813

" directory?\n");

814

process_list = NULL;

921

922

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

923

if(p->pid != 0){

924

break;

925

}

926

if(p->next == NULL){

927

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

928

" directory?\n");

929

free_plugin_list();

930

}

815

931

}

816

while(process_list){

932

933

/* Main loop while running plugins exist */

934

while(plugin_list){

817

935

fd_set rfds = rfds_all;

818

936

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

819

937

if (select_ret == -1){

823

941

}

824

942

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

825

943

from one of them */

826

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

944

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

827

945

/* Is this process completely done? */

828

946

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

829

947

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

830

948

if(not WIFEXITED(proc->status)

831

949

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

832

950

/* Bad exit by plugin */

951

833

952

if(debug){

834

953

if(WIFEXITED(proc->status)){

835

954

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

844

963

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

845

964

}

846

965

}

966

847

967

/* Remove the plugin */

848

968

FD_CLR(proc->fd, &rfds_all);

969

849

970

/* Block signal while modifying process_list */

850

971

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

851

972

if(ret < 0){

853

974

exitstatus = EXIT_FAILURE;

854

975

goto fallback;

855

976

}

856

/* Delete this process entry from the list */

857

if(process_list == proc){

858

/* First one - simple */

859

process_list = proc->next;

860

} else {

861

/* Second one or later */

862

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

863

if(p->next == proc){

864

p->next = proc->next;

865

break;

866

}

867

}

868

}

977

free_plugin(proc);

869

978

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

870

979

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

871

980

NULL);

872

981

if(ret < 0){

873

982

perror("sigprocmask");

874

}

875

free(proc->buffer);

876

free(proc);

877

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

878

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

879

the process list */

880

break;

983

exitstatus = EXIT_FAILURE;

984

goto fallback;

985

}

986

987

if(plugin_list == NULL){

988

break;

989

}

990

continue;

881

991

}

992

882

993

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

883

994

884

995

bool bret = print_out_password(proc->buffer,

889

1000

}

890

1001

goto fallback;

891

1002

}

1003

892

1004

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

893

1005

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

894

1006

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

924

1036

925

1037

fallback:

926

1038

927

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

1039

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

928

1040

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

929

1041

occured */

930

1042

bool bret;

931

1043

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

932

1044

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

933

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

1045

size_t len = strlen(passwordbuffer);

1046

/* Strip trailing newline */

1047

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

1048

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

1049

len--;

1050

}

1051

bret = print_out_password(passwordbuffer, len);

934

1052

if(not bret){

935

1053

perror("print_out_password");

936

1054

exitstatus = EXIT_FAILURE;

945

1063

}

946

1064

947

1065

if(custom_argv != NULL){

948

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

1066

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

949

1067

free(*arg);

950

1068

}

951

1069

free(custom_argv);

952

1070

}

953

free_plugin_list(plugin_list);

954

1071

955

1072

if(dir != NULL){

956

1073

closedir(dir);

957

1074

}

958

1075

959

1076

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

960

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

961

next = process_list->next;

962

close(process_list->fd);

963

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

964

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

965

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

966

perror("kill");

1077

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

1078

if(p->pid != 0){

1079

close(p->fd);

1080

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

1081

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

1082

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

1083

perror("kill");

1084

}

967

1085

}

968

free(process_list->buffer);

969

free(process_list);

970

1086

}

971

1087

972

1088

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

976

1092

if(errno != ECHILD){

977

1093

perror("wait");

978

1094

}

1095

1096

free_plugin_list();

1097

1098

free(plugindir);

1099

free(argfile);

979

1100

980

1101

return exitstatus;

981

1102

}