/mandos/trunk : revision 183

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#include <argp.h> /* struct argp_option, struct

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argp_state, struct argp,

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argp_parse(), ARGP_ERR_UNKNOWN,

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ARGP_KEY_END, ARGP_KEY_ARG, error_t */

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ARGP_KEY_END, ARGP_KEY_ARG,

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error_t */

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#include <signal.h> /* struct sigaction, sigemptyset(),

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sigaddset(), sigaction(),

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sigprocmask(), SIG_BLOCK, SIGCHLD,

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#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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pid_t pid;

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int fd;

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char *buffer;

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size_t buffer_size;

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size_t buffer_length;

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bool eof;

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bool completed;

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int status;

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struct process *next;

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} 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 **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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size_t buffer_size;

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size_t buffer_length;

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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 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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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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149

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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){

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

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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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/*

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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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221

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process *process_list = NULL;

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222

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/* Mark a process as completed when it exits, and save its exit

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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){

205

process *proc = process_list;

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int status;

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pid_t pid = wait(&status);

208

if(pid == -1){

209

perror("wait");

210

return;

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}

212

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

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proc = proc->next;

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}

215

if(proc == NULL){

216

/* Process not found in process list */

217

return;

218

}

219

proc->status = status;

220

proc->completed = true;

226

while(true){

227

plugin *proc = plugin_list;

228

int status;

229

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

230

if(pid == 0){

231

/* Only still running child processes */

232

break;

233

}

234

if(pid == -1){

235

if (errno != ECHILD){

236

perror("waitpid");

237

}

238

/* No child processes */

239

break;

240

}

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

243

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

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proc = proc->next;

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}

246

if(proc == NULL){

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/* Process not found in process list */

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continue;

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}

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proc->status = status;

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proc->completed = true;

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}

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}

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/* Prints out a password to stdout */

223

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

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257

ssize_t ret;

225

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

226

length--;

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}

228

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

229

259

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

230

260

length - written));

235

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return true;

236

266

}

237

267

238

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

239

if (argv == NULL){

240

*argc = 1;

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

242

if(argv == NULL){

243

return NULL;

268

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

269

static void free_plugin(plugin *plugin_node){

270

271

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

272

free(*arg);

273

}

274

free(plugin_node->argv);

275

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

276

free(*env);

277

}

278

free(plugin_node->environ);

279

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;

290

break;

291

}

244

292

}

245

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

246

argv[1] = NULL;

247

}

248

*argc += 1;

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argv = realloc(argv, sizeof(char *)

250

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

251

if(argv == NULL){

252

return NULL;

253

}

254

argv[*argc-1] = arg;

255

argv[*argc] = NULL;

256

return argv;

293

}

294

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free(plugin_node);

257

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}

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static void free_plugin_list(plugin *plugin_list){

260

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

261

next = plugin_list->next;

262

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

263

free(*arg);

264

}

265

free(plugin_list->argv);

266

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

267

free(*env);

268

}

269

free(plugin_list->environ);

270

free(plugin_list);

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

271

301

}

272

302

}

273

303

274

304

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

275

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

276

const char *argfile = ARGFILE;

305

char *plugindir = NULL;

306

char *argfile = NULL;

277

307

FILE *conffp;

278

308

size_t d_name_len;

279

309

DIR *dir = NULL;

311

341

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

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

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343

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

314

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

344

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

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.arg = "VAR=value",

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

317

347

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

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

319

349

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

320

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

350

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

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.arg = "PLUGIN:ENV=value",

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

323

353

{ .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 = "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,

333

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

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

335

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

336

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

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

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.arg = "FILE",

364

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

365

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

366

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

367

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

368

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

369

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

370

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

371

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

372

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

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373

{ .name = NULL }

338

374

};

339

375

340

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

341

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

342

pointer to our plugin list pointer. */

343

plugin **plugins = state->input;

376

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

377

struct argp_state *state) {

344

378

switch (key) {

345

case 'g':

379

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

346

380

if (arg != NULL){

347

381

char *p;

348

382

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

349

383

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

350

384

continue;

351

385

}

352

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

386

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

353

387

perror("add_argument");

354

388

return ARGP_ERR_UNKNOWN;

355

389

}

356

390

}

357

391

}

358

392

break;

359

case 'e':

393

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

360

394

if(arg == NULL){

361

395

break;

362

396

}

363

{

364

char *envdef = strdup(arg);

365

if(envdef == NULL){

366

break;

367

}

368

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

369

perror("add_environment");

370

}

397

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

398

perror("add_environment");

371

399

}

372

400

break;

373

case 'o':

401

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

374

402

if (arg != NULL){

375

403

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

376

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

404

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

377

405

break;

378

406

}

379

407

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

380

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

408

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

381

409

break;

382

410

}

383

if(opt != NULL){

384

char *p;

385

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

386

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

387

continue;

388

}

389

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

390

perror("add_argument");

391

return ARGP_ERR_UNKNOWN;

392

}

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;

393

419

}

394

420

}

395

421

}

396

422

break;

397

case 'f':

423

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

398

424

if(arg == NULL){

399

425

break;

400

426

}

403

429

if(envdef == NULL){

404

430

break;

405

431

}

406

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

407

if(p_name == NULL){

408

break;

409

}

410

envdef++;

411

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

432

*envdef = '\0';

433

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

412

434

perror("add_environment");

413

435

}

414

436

}

415

437

break;

416

case 'd':

438

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

417

439

if (arg != NULL){

418

plugin *p = getplugin(arg, plugins);

440

plugin *p = getplugin(arg);

419

441

if(p == NULL){

420

442

return ARGP_ERR_UNKNOWN;

421

443

}

422

444

p->disabled = true;

423

445

}

424

446

break;

425

case 128:

426

plugindir = arg;

427

break;

428

case 129:

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 */

429

467

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

430

468

break;

431

case 130:

469

case 131: /* --groupid */

432

470

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

433

471

break;

434

case 131:

472

case 132: /* --debug */

435

473

debug = true;

436

474

break;

437

475

case ARGP_KEY_ARG:

438

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

439

break;

440

case ARGP_KEY_END:

441

break;

442

default:

443

return ARGP_ERR_UNKNOWN;

444

}

445

return 0;

446

}

447

448

plugin *plugin_list = NULL;

449

450

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

451

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

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 = "",

452

527

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

453

528

454

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

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);

455

532

if (ret == ARGP_ERR_UNKNOWN){

456

533

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

457

534

exitstatus = EXIT_FAILURE;

458

535

goto fallback;

459

536

}

460

461

conffp = fopen(argfile, "r");

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

}

462

547

if(conffp != NULL){

463

548

char *org_line = NULL;

464

549

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

467

552

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

468

553

const char comment_delim[] = "#";

469

554

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 */

470

567

while(true){

471

568

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

472

569

if(sret == -1){

480

577

continue;

481

578

}

482

579

new_arg = strdup(p);

483

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

484

if (custom_argv == NULL){

485

perror("add_to_argv");

486

exitstatus = EXIT_FAILURE;

487

goto fallback;

488

}

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;

489

598

}

490

599

}

491

600

free(org_line);

492

} else{

601

} else {

493

602

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

494

603

not affect opening plugins */

495

604

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

498

607

goto fallback;

499

608

}

500

609

}

501

610

/* If there was any arguments from configuration file,

611

pass them to parser as command arguments */

502

612

if(custom_argv != NULL){

503

custom_argv[0] = argv[0];

504

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

613

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

614

0, NULL);

505

615

if (ret == ARGP_ERR_UNKNOWN){

506

616

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

507

617

exitstatus = EXIT_FAILURE;

509

619

}

510

620

}

511

621

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

512

631

if(debug){

513

632

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

514

633

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

523

642

}

524

643

}

525

644

645

/* Strip permissions down to nobody */

526

646

ret = setuid(uid);

527

647

if (ret == -1){

528

648

perror("setuid");

529

}

530

649

}

531

650

setgid(gid);

532

651

if (ret == -1){

533

652

perror("setgid");

534

653

}

535

654

536

dir = opendir(plugindir);

655

if (plugindir == NULL){

656

dir = opendir(PDIR);

657

} else {

658

dir = opendir(plugindir);

659

}

660

537

661

if(dir == NULL){

538

662

perror("Could not open plugin dir");

539

663

exitstatus = EXIT_FAILURE;

555

679

556

680

FD_ZERO(&rfds_all);

557

681

682

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

558

683

while(true){

559

684

dirst = readdir(dir);

560

685

561

// All directory entries have been processed

686

/* All directory entries have been processed */

562

687

if(dirst == NULL){

563

688

if (errno == EBADF){

564

689

perror("readdir");

570

695

571

696

d_name_len = strlen(dirst->d_name);

572

697

573

// Ignore dotfiles, backup files and other junk

698

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

574

699

{

575

700

bool bad_name = false;

576

701

591

716

break;

592

717

}

593

718

}

594

595

719

if(bad_name){

596

720

continue;

597

721

}

598

599

722

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

600

723

size_t suf_len = strlen(*suf);

601

724

if((d_name_len >= suf_len)

616

739

}

617

740

618

741

char *filename;

619

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

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

}

620

747

if(ret < 0){

621

748

perror("asprintf");

622

749

continue;

628

755

free(filename);

629

756

continue;

630

757

}

631

758

759

/* Ignore non-executable files */

632

760

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

633

761

if(debug){

634

762

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

637

765

free(filename);

638

766

continue;

639

767

}

640

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

768

769

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

641

770

if(p == NULL){

642

771

perror("getplugin");

643

772

free(filename);

653

782

}

654

783

{

655

784

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

656

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

785

plugin *g = getplugin(NULL);

657

786

if(g != NULL){

658

787

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

659

788

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

662

791

}

663

792

/* Add global environment variables */

664

793

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

665

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

794

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

666

795

perror("add_environment");

667

796

}

668

797

}

673

802

process, too. */

674

803

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

675

804

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

676

char *copy = strdup(*e);

677

if(copy == NULL){

678

perror("strdup");

679

continue;

680

}

681

if(not add_environment(p, copy)){

805

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

682

806

perror("add_environment");

683

807

}

684

808

}

691

815

exitstatus = EXIT_FAILURE;

692

816

goto fallback;

693

817

}

818

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

694

819

ret = set_cloexec_flag(pipefd[0]);

695

820

if(ret < 0){

696

821

perror("set_cloexec_flag");

710

835

exitstatus = EXIT_FAILURE;

711

836

goto fallback;

712

837

}

713

// Starting a new process to be watched

838

/* Starting a new process to be watched */

714

839

pid_t pid = fork();

715

840

if(pid == -1){

716

841

perror("fork");

754

879

}

755

880

/* no return */

756

881

}

757

/* parent process */

882

/* Parent process */

883

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

758

884

free(filename);

759

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

760

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

761

if (new_process == NULL){

762

perror("malloc");

885

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

886

if (new_plugin == NULL){

887

perror("getplugin");

763

888

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

764

889

if(ret < 0){

765

perror("sigprocmask");

890

perror("sigprocmask");

766

891

}

767

892

exitstatus = EXIT_FAILURE;

768

893

goto fallback;

769

894

}

770

895

771

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

772

.fd = pipefd[0],

773

.next = process_list };

774

// List handling

775

process_list = new_process;

896

new_plugin->pid = pid;

897

new_plugin->fd = pipefd[0];

898

776

899

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

777

900

has already completed */

778

901

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

782

905

goto fallback;

783

906

}

784

907

785

FD_SET(new_process->fd, &rfds_all);

908

FD_SET(new_plugin->fd, &rfds_all);

786

909

787

if (maxfd < new_process->fd){

788

maxfd = new_process->fd;

910

if (maxfd < new_plugin->fd){

911

maxfd = new_plugin->fd;

789

912

}

790

913

791

914

}

792

915

793

free_plugin_list(plugin_list);

794

plugin_list = NULL;

795

796

916

closedir(dir);

797

917

dir = NULL;

798

799

if (process_list == NULL){

800

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

801

" directory?\n");

802

process_list = 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

}

803

928

}

804

while(process_list){

929

930

/* Main loop while running plugins exist */

931

while(plugin_list){

805

932

fd_set rfds = rfds_all;

806

933

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

807

934

if (select_ret == -1){

811

938

}

812

939

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

813

940

from one of them */

814

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

941

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

815

942

/* Is this process completely done? */

816

943

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

817

944

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

818

945

if(not WIFEXITED(proc->status)

819

946

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

820

947

/* Bad exit by plugin */

948

821

949

if(debug){

822

950

if(WIFEXITED(proc->status)){

823

951

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

832

960

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

833

961

}

834

962

}

963

835

964

/* Remove the plugin */

836

965

FD_CLR(proc->fd, &rfds_all);

966

837

967

/* Block signal while modifying process_list */

838

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

968

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

839

969

if(ret < 0){

840

970

perror("sigprocmask");

841

971

exitstatus = EXIT_FAILURE;

842

972

goto fallback;

843

973

}

844

/* Delete this process entry from the list */

845

if(process_list == proc){

846

/* First one - simple */

847

process_list = proc->next;

848

} else {

849

/* Second one or later */

850

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

851

if(p->next == proc){

852

p->next = proc->next;

853

break;

854

}

855

}

856

}

974

857

975

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

858

976

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

859

977

NULL);

860

978

if(ret < 0){

861

979

perror("sigprocmask");

862

}

863

free(proc->buffer);

864

free(proc);

865

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

866

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

867

the process list */

868

break;

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;

869

992

}

993

870

994

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

871

995

872

bool bret = print_out_password(proc->buffer, proc->buffer_length);

996

bool bret = print_out_password(proc->buffer,

997

proc->buffer_length);

873

998

if(not bret){

874

999

perror("print_out_password");

875

1000

exitstatus = EXIT_FAILURE;

876

1001

}

877

1002

goto fallback;

878

1003

}

1004

879

1005

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

880

1006

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

881

1007

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

1008

proc = proc->next;

882

1009

continue;

883

1010

}

884

1011

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

897

1024

BUFFER_SIZE);

898

1025

if(ret < 0){

899

1026

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

1027

proc = proc->next;

900

1028

continue;

901

1029

}

902

1030

if(ret == 0){

911

1039

912

1040

fallback:

913

1041

914

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

915

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

1042

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

1043

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

1044

occured */

916

1045

bool bret;

917

1046

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

918

1047

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

919

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

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);

920

1055

if(not bret){

921

1056

perror("print_out_password");

922

1057

exitstatus = EXIT_FAILURE;

931

1066

}

932

1067

933

1068

if(custom_argv != NULL){

934

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

1069

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

935

1070

free(*arg);

936

1071

}

937

1072

free(custom_argv);

938

1073

}

939

free_plugin_list(plugin_list);

940

1074

941

1075

if(dir != NULL){

942

1076

closedir(dir);

943

1077

}

944

1078

945

1079

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

946

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

947

next = process_list->next;

948

close(process_list->fd);

949

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

950

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

951

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

952

perror("kill");

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

}

953

1088

}

954

free(process_list->buffer);

955

free(process_list);

956

1089

}

957

1090

958

1091

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

962

1095

if(errno != ECHILD){

963

1096

perror("wait");

964

1097

}

1098

1099

free_plugin_list();

1100

1101

free(plugindir);

1102

free(argfile);

965

1103

966

1104

return exitstatus;

967

1105

}