/mandos/trunk : revision 24.1.65

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

57

argp_state, struct argp,

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argp_parse(), ARGP_ERR_UNKNOWN,

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ARGP_KEY_END, ARGP_KEY_ARG,

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error_t */

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ARGP_KEY_END, ARGP_KEY_ARG, 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 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 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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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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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 *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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120

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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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142

}

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143

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173

}

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/* Add to a plugin's environment */

180

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

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

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if(p == NULL){

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return false;

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}

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

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

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/* Search for this environment variable */

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

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

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/* It already exists */

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if(replace){

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

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if(new == NULL){

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return false;

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}

195

*e = new;

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strcpy(*e, def);

197

}

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return true;

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}

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}

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180

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

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181

}

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/*

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185

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

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186

* Descriptor Flags".

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* *Note File Descriptor Flags:(libc)Descriptor Flags.

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188

*/

209

static int set_cloexec_flag(int fd){

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static int set_cloexec_flag(int fd)

190

{

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191

int ret = fcntl(fd, F_GETFD, 0);

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192

/* If reading the flags failed, return error indication now. */

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193

if(ret < 0){

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197

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

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}

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process *process_list = NULL;

219

201

220

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

202

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

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status. */

222

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

204

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

205

process *proc = process_list;

223

206

while(true){

224

plugin *proc = plugin_list;

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207

int status;

226

208

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

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209

if(pid == 0){

228

/* Only still running child processes */

229

210

break;

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211

}

231

212

if(pid == -1){

232

213

if (errno != ECHILD){

233

214

perror("waitpid");

234

215

}

235

/* No child processes */

236

break;

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return;

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217

}

238

239

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

218

240

219

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

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220

proc = proc->next;

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221

}

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228

}

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}

251

230

252

/* Prints out a password to stdout */

253

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

231

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

254

232

ssize_t ret;

233

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

234

length--;

235

}

255

236

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

256

237

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

257

238

length - written));

262

243

return true;

263

244

}

264

245

265

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

266

static void free_plugin(plugin *plugin_node){

267

268

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

269

free(*arg);

270

}

271

free(plugin_node->argv);

272

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

273

free(*env);

274

}

275

free(plugin_node->environ);

276

free(plugin_node->buffer);

277

278

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

279

if(plugin_node == plugin_list){

280

/* First one - simple */

281

plugin_list = plugin_list->next;

282

} else {

283

/* Second one or later */

284

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

285

if(p->next == plugin_node){

286

p->next = plugin_node->next;

287

break;

288

}

246

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

247

if (argv == NULL){

248

*argc = 1;

249

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

250

if(argv == NULL){

251

return NULL;

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252

}

290

}

291

292

free(plugin_node);

253

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

254

argv[1] = NULL;

255

}

256

*argc += 1;

257

argv = realloc(argv, sizeof(char *)

258

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

259

if(argv == NULL){

260

return NULL;

261

}

262

argv[*argc-1] = arg;

263

argv[*argc] = NULL;

264

return argv;

293

265

}

294

266

295

static void free_plugin_list(void){

296

while(plugin_list != NULL){

297

free_plugin(plugin_list);

267

static void free_plugin_list(plugin *plugin_list){

268

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

269

next = plugin_list->next;

270

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

271

free(*arg);

272

}

273

free(plugin_list->argv);

274

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

275

free(*env);

276

}

277

free(plugin_list->environ);

278

free(plugin_list);

298

279

}

299

280

}

300

281

301

282

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

302

char *plugindir = NULL;

303

char *argfile = NULL;

283

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

284

const char *argfile = ARGFILE;

304

285

FILE *conffp;

305

286

size_t d_name_len;

306

287

DIR *dir = NULL;

338

319

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

339

320

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

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

341

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

322

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

342

323

.arg = "VAR=value",

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

344

325

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

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326

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

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327

.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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329

.arg = "PLUGIN:ENV=value",

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

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

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.arg = "PLUGIN",

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

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

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.arg = "PLUGIN",

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

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

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.arg = "DIRECTORY",

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

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

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.arg = "FILE",

361

.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,

367

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

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

369

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

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

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

339

.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,

342

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

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

344

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

370

345

{ .name = NULL }

371

346

};

372

347

373

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

374

struct argp_state *state) {

348

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

349

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

350

pointer to our plugin list pointer. */

351

plugin **plugins = state->input;

375

352

switch (key) {

376

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

353

case 'g':

377

354

if (arg != NULL){

378

355

char *p;

379

356

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

380

357

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

381

358

continue;

382

359

}

383

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

360

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

384

361

perror("add_argument");

385

362

return ARGP_ERR_UNKNOWN;

386

363

}

387

364

}

388

365

}

389

366

break;

390

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

367

case 'e':

391

368

if(arg == NULL){

392

369

break;

393

370

}

394

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

395

perror("add_environment");

371

{

372

char *envdef = strdup(arg);

373

if(envdef == NULL){

374

break;

375

}

376

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

377

perror("add_environment");

378

}

396

379

}

397

380

break;

398

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

381

case 'o':

399

382

if (arg != NULL){

400

383

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

401

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

384

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

402

385

break;

403

386

}

404

387

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

405

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

388

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

406

389

break;

407

390

}

408

char *p;

409

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

410

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

411

continue;

412

}

413

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

414

perror("add_argument");

415

return ARGP_ERR_UNKNOWN;

391

if(opt != NULL){

392

char *p;

393

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

394

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

395

continue;

396

}

397

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

398

perror("add_argument");

399

return ARGP_ERR_UNKNOWN;

400

}

416

401

}

417

402

}

418

403

}

419

404

break;

420

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

405

case 'f':

421

406

if(arg == NULL){

422

407

break;

423

408

}

426

411

if(envdef == NULL){

427

412

break;

428

413

}

429

*envdef = '\0';

430

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

414

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

415

if(p_name == NULL){

416

break;

417

}

418

envdef++;

419

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

431

420

perror("add_environment");

432

421

}

433

422

}

434

423

break;

435

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

424

case 'd':

436

425

if (arg != NULL){

437

plugin *p = getplugin(arg);

426

plugin *p = getplugin(arg, plugins);

438

427

if(p == NULL){

439

428

return ARGP_ERR_UNKNOWN;

440

429

}

441

430

p->disabled = true;

442

431

}

443

432

break;

444

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

445

if (arg != NULL){

446

plugin *p = getplugin(arg);

447

if(p == NULL){

448

return ARGP_ERR_UNKNOWN;

449

}

450

p->disabled = false;

451

}

452

break;

453

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

454

free(plugindir);

455

plugindir = strdup(arg);

456

if(plugindir == NULL){

457

perror("strdup");

458

}

459

break;

460

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

461

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

462

break;

463

case 130: /* --userid */

433

case 128:

434

plugindir = arg;

435

break;

436

case 129:

464

437

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

465

438

break;

466

case 131: /* --groupid */

439

case 130:

467

440

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

468

441

break;

469

case 132: /* --debug */

442

case 131:

470

443

debug = true;

471

444

break;

472

445

case ARGP_KEY_ARG:

473

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

474

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

475

argument was empty, we ignore it silently. */

476

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

477

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

478

}

479

break;

480

case ARGP_KEY_END:

481

break;

482

default:

483

return ARGP_ERR_UNKNOWN;

484

}

485

return 0;

486

}

487

488

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

489

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

490

error_t parse_opt_config_file (int key, char *arg,

491

__attribute__((unused))

492

struct argp_state *state) {

493

switch (key) {

494

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

495

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

496

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

497

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

498

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

499

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

500

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

501

break;

502

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

503

free(argfile);

504

argfile = strdup(arg);

505

if(argfile == NULL){

506

perror("strdup");

507

}

508

break;

509

case 130: /* --userid */

510

case 131: /* --groupid */

511

case 132: /* --debug */

512

case ARGP_KEY_ARG:

513

case ARGP_KEY_END:

514

break;

515

default:

516

return ARGP_ERR_UNKNOWN;

517

}

518

return 0;

519

}

520

521

struct argp argp = { .options = options,

522

.parser = parse_opt_config_file,

523

.args_doc = "",

446

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

447

break;

448

case ARGP_KEY_END:

449

break;

450

default:

451

return ARGP_ERR_UNKNOWN;

452

}

453

return 0;

454

}

455

456

plugin *plugin_list = NULL;

457

458

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

459

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

524

460

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

525

461

526

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

527

config file location, if any. */

528

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

462

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

529

463

if (ret == ARGP_ERR_UNKNOWN){

530

464

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

531

465

exitstatus = EXIT_FAILURE;

532

466

goto fallback;

533

467

}

534

535

/* Reset to the normal argument parser */

536

argp.parser = parse_opt;

537

538

/* Open the configfile if available */

539

if (argfile == NULL){

540

conffp = fopen(AFILE, "r");

541

} else {

542

conffp = fopen(argfile, "r");

543

}

468

469

conffp = fopen(argfile, "r");

544

470

if(conffp != NULL){

545

471

char *org_line = NULL;

546

472

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

549

475

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

550

476

const char comment_delim[] = "#";

551

477

552

custom_argc = 1;

553

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

554

if(custom_argv == NULL){

555

perror("malloc");

556

exitstatus = EXIT_FAILURE;

557

goto fallback;

558

}

559

custom_argv[0] = argv[0];

560

custom_argv[1] = NULL;

561

562

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

563

commented text */

564

478

while(true){

565

479

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

566

480

if(sret == -1){

574

488

continue;

575

489

}

576

490

new_arg = strdup(p);

577

if(new_arg == NULL){

578

perror("strdup");

579

exitstatus = EXIT_FAILURE;

580

free(org_line);

581

goto fallback;

582

}

583

584

custom_argc += 1;

585

custom_argv = realloc(custom_argv, sizeof(char *)

586

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

587

if(custom_argv == NULL){

588

perror("realloc");

589

exitstatus = EXIT_FAILURE;

590

free(org_line);

591

goto fallback;

592

}

593

custom_argv[custom_argc-1] = new_arg;

594

custom_argv[custom_argc] = NULL;

491

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

492

if (custom_argv == NULL){

493

perror("add_to_argv");

494

exitstatus = EXIT_FAILURE;

495

goto fallback;

496

}

595

497

}

596

498

}

597

499

free(org_line);

598

} else {

500

} else{

599

501

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

600

502

not affect opening plugins */

601

503

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

604

506

goto fallback;

605

507

}

606

508

}

607

/* If there was any arguments from configuration file,

608

pass them to parser as command arguments */

509

609

510

if(custom_argv != NULL){

610

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

611

0, NULL);

511

custom_argv[0] = argv[0];

512

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

612

513

if (ret == ARGP_ERR_UNKNOWN){

613

514

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

614

515

exitstatus = EXIT_FAILURE;

616

517

}

617

518

}

618

519

619

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

620

config file */

621

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

622

if (ret == ARGP_ERR_UNKNOWN){

623

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

624

exitstatus = EXIT_FAILURE;

625

goto fallback;

626

}

627

628

520

if(debug){

629

521

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

630

522

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

639

531

}

640

532

}

641

533

642

/* Strip permissions down to nobody */

643

534

ret = setuid(uid);

644

535

if (ret == -1){

645

536

perror("setuid");

646

}

537

}

538

647

539

setgid(gid);

648

540

if (ret == -1){

649

541

perror("setgid");

650

542

}

651

543

652

if (plugindir == NULL){

653

dir = opendir(PDIR);

654

} else {

655

dir = opendir(plugindir);

656

}

657

544

dir = opendir(plugindir);

658

545

if(dir == NULL){

659

546

perror("Could not open plugin dir");

660

547

exitstatus = EXIT_FAILURE;

676

563

677

564

FD_ZERO(&rfds_all);

678

565

679

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

680

566

while(true){

681

567

dirst = readdir(dir);

682

568

683

/* All directory entries have been processed */

569

// All directory entries have been processed

684

570

if(dirst == NULL){

685

571

if (errno == EBADF){

686

572

perror("readdir");

692

578

693

579

d_name_len = strlen(dirst->d_name);

694

580

695

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

581

// Ignore dotfiles, backup files and other junk

696

582

{

697

583

bool bad_name = false;

698

584

713

599

break;

714

600

}

715

601

}

602

716

603

if(bad_name){

717

604

continue;

718

605

}

606

719

607

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

720

608

size_t suf_len = strlen(*suf);

721

609

if((d_name_len >= suf_len)

736

624

}

737

625

738

626

char *filename;

739

if(plugindir == NULL){

740

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

741

} else {

742

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

743

}

627

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

744

628

if(ret < 0){

745

629

perror("asprintf");

746

630

continue;

752

636

free(filename);

753

637

continue;

754

638

}

755

756

/* Ignore non-executable files */

639

757

640

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

758

641

if(debug){

759

642

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

762

645

free(filename);

763

646

continue;

764

647

}

765

766

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

648

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

767

649

if(p == NULL){

768

650

perror("getplugin");

769

651

free(filename);

779

661

}

780

662

{

781

663

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

782

plugin *g = getplugin(NULL);

664

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

783

665

if(g != NULL){

784

666

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

785

667

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

788

670

}

789

671

/* Add global environment variables */

790

672

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

791

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

673

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

792

674

perror("add_environment");

793

675

}

794

676

}

799

681

process, too. */

800

682

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

801

683

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

802

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

684

char *copy = strdup(*e);

685

if(copy == NULL){

686

perror("strdup");

687

continue;

688

}

689

if(not add_environment(p, copy)){

803

690

perror("add_environment");

804

691

}

805

692

}

812

699

exitstatus = EXIT_FAILURE;

813

700

goto fallback;

814

701

}

815

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

816

702

ret = set_cloexec_flag(pipefd[0]);

817

703

if(ret < 0){

818

704

perror("set_cloexec_flag");

832

718

exitstatus = EXIT_FAILURE;

833

719

goto fallback;

834

720

}

835

/* Starting a new process to be watched */

721

// Starting a new process to be watched

836

722

pid_t pid = fork();

837

723

if(pid == -1){

838

724

perror("fork");

876

762

}

877

763

/* no return */

878

764

}

879

/* Parent process */

880

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

765

/* parent process */

881

766

free(filename);

882

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

883

if (new_plugin == NULL){

884

perror("getplugin");

767

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

768

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

769

if (new_process == NULL){

770

perror("malloc");

885

771

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

886

772

if(ret < 0){

887

perror("sigprocmask");

773

perror("sigprocmask");

888

774

}

889

775

exitstatus = EXIT_FAILURE;

890

776

goto fallback;

891

777

}

892

778

893

new_plugin->pid = pid;

894

new_plugin->fd = pipefd[0];

895

779

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

780

.fd = pipefd[0],

781

.next = process_list };

782

// List handling

783

process_list = new_process;

896

784

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

897

785

has already completed */

898

786

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

902

790

goto fallback;

903

791

}

904

792

905

FD_SET(new_plugin->fd, &rfds_all);

793

FD_SET(new_process->fd, &rfds_all);

906

794

907

if (maxfd < new_plugin->fd){

908

maxfd = new_plugin->fd;

795

if (maxfd < new_process->fd){

796

maxfd = new_process->fd;

909

797

}

910

798

911

799

}

912

800

801

free_plugin_list(plugin_list);

802

plugin_list = NULL;

803

913

804

closedir(dir);

914

805

dir = NULL;

915

916

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

917

if(p->pid != 0){

918

break;

919

}

920

if(p->next == NULL){

921

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

922

" directory?\n");

923

free_plugin_list();

924

}

806

807

if (process_list == NULL){

808

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

809

" directory?\n");

810

process_list = NULL;

925

811

}

926

927

/* Main loop while running plugins exist */

928

while(plugin_list){

812

while(process_list){

929

813

fd_set rfds = rfds_all;

930

814

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

931

815

if (select_ret == -1){

935

819

}

936

820

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

937

821

from one of them */

938

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

822

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

939

823

/* Is this process completely done? */

940

824

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

941

825

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

942

826

if(not WIFEXITED(proc->status)

943

827

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

944

828

/* Bad exit by plugin */

945

946

829

if(debug){

947

830

if(WIFEXITED(proc->status)){

948

831

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

957

840

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

958

841

}

959

842

}

960

961

843

/* Remove the plugin */

962

844

FD_CLR(proc->fd, &rfds_all);

963

964

845

/* Block signal while modifying process_list */

965

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

846

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

966

847

if(ret < 0){

967

848

perror("sigprocmask");

968

849

exitstatus = EXIT_FAILURE;

969

850

goto fallback;

970

851

}

971

852

/* Delete this process entry from the list */

853

if(process_list == proc){

854

/* First one - simple */

855

process_list = proc->next;

856

} else {

857

/* Second one or later */

858

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

859

if(p->next == proc){

860

p->next = proc->next;

861

break;

862

}

863

}

864

}

972

865

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

973

866

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

974

867

NULL);

975

868

if(ret < 0){

976

869

perror("sigprocmask");

977

exitstatus = EXIT_FAILURE;

978

goto fallback;

979

}

980

981

if(plugin_list == NULL){

982

break;

983

}

984

985

plugin *next_plugin = proc->next;

986

free_plugin(proc);

987

proc = next_plugin;

988

continue;

870

}

871

free(proc->buffer);

872

free(proc);

873

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

874

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

875

the process list */

876

break;

989

877

}

990

991

878

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

992

879

993

bool bret = print_out_password(proc->buffer,

994

proc->buffer_length);

880

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

995

881

if(not bret){

996

882

perror("print_out_password");

997

883

exitstatus = EXIT_FAILURE;

998

884

}

999

885

goto fallback;

1000

886

}

1001

1002

887

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

1003

888

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

1004

889

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

1005

proc = proc->next;

1006

890

continue;

1007

891

}

1008

892

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

1021

905

BUFFER_SIZE);

1022

906

if(ret < 0){

1023

907

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

1024

proc = proc->next;

1025

908

continue;

1026

909

}

1027

910

if(ret == 0){

1036

919

1037

920

fallback:

1038

921

1039

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

1040

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

1041

occured */

922

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

923

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

1042

924

bool bret;

1043

925

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

1044

926

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

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);

927

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

1052

928

if(not bret){

1053

929

perror("print_out_password");

1054

930

exitstatus = EXIT_FAILURE;

1063

939

}

1064

940

1065

941

if(custom_argv != NULL){

1066

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

942

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

1067

943

free(*arg);

1068

944

}

1069

945

free(custom_argv);

1070

946

}

947

free_plugin_list(plugin_list);

1071

948

1072

949

if(dir != NULL){

1073

950

closedir(dir);

1074

951

}

1075

952

1076

953

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

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

}

954

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

955

next = process_list->next;

956

close(process_list->fd);

957

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

958

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

959

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

960

perror("kill");

1085

961

}

962

free(process_list->buffer);

963

free(process_list);

1086

964

}

1087

965

1088

966

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

1092

970

if(errno != ECHILD){

1093

971

perror("wait");

1094

972

}

1095

1096

free_plugin_list();

1097

1098

free(plugindir);

1099

free(argfile);

1100

973

1101

974

return exitstatus;

1102

975

}