/mandos/trunk : revision 88

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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,

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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 plugin;

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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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90

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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100

return p;

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105

if (new_plugin == NULL){

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return NULL;

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107

}

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char *copy_name = NULL;

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if(name != NULL){

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copy_name = strdup(name);

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if(copy_name == NULL){

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return NULL;

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}

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char *copy_name = strdup(name);

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if(copy_name == NULL){

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return NULL;

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111

}

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

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114

.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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118

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

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if (new_plugin->argv == NULL){

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free(copy_name);

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free(new_plugin);

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return NULL;

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123

}

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124

new_plugin->argv[0] = copy_name;

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125

new_plugin->argv[1] = NULL;

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126

136

127

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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129

free(new_plugin->argv);

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free(new_plugin);

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131

return NULL;

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132

}

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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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137

}

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168

}

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/* Add to a plugin's environment */

182

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

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

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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 */

192

if(replace){

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

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if(new == NULL){

195

return false;

196

}

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*e = new;

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strcpy(*e, def);

199

}

200

return true;

201

}

202

}

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175

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

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176

}

205

177

178

206

179

/*

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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);

220

193

}

221

194

195

process *process_list = NULL;

222

196

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

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

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status. */

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

226

while(true){

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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){

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perror("waitpid");

237

}

238

/* No child processes */

239

break;

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}

241

242

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

243

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

244

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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}

250

proc->status = status;

251

proc->completed = true;

252

}

200

process *proc = process_list;

201

int status;

202

pid_t pid = wait(&status);

203

if(pid == -1){

204

perror("wait");

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return;

206

}

207

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

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proc = proc->next;

209

}

210

if(proc == NULL){

211

/* Process not found in process list */

212

return;

213

}

214

proc->status = status;

215

proc->completed = true;

253

216

}

254

217

255

/* Prints out a password to stdout */

256

218

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

257

219

ssize_t ret;

220

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

221

length--;

222

}

258

223

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

259

224

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

260

225

length - written));

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230

return true;

266

231

}

267

232

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

269

static void free_plugin(plugin *plugin_node){

270

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

272

free(*arg);

273

}

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free(plugin_node->argv);

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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

}

233

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

234

if (argv == NULL){

235

*argc = 1;

236

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

237

if(argv == NULL){

238

return NULL;

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239

}

293

}

294

295

free(plugin_node);

240

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

241

argv[1] = NULL;

242

}

243

*argc += 1;

244

argv = realloc(argv, sizeof(char *)

245

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

246

if(argv == NULL){

247

return NULL;

248

}

249

argv[*argc-1] = arg;

250

argv[*argc] = NULL;

251

return argv;

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252

}

297

253

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

301

}

254

static void free_plugin_list(plugin *plugin_list){

255

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

256

next = plugin_list->next;

257

free(plugin_list->name);

258

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

259

free(*arg);

260

}

261

free(plugin_list->argv);

262

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

263

free(*env);

264

}

265

free(plugin_list->environ);

266

free(plugin_list);

267

}

302

268

}

303

269

304

270

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

305

char *plugindir = NULL;

306

char *argfile = NULL;

271

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

272

const char *argfile = ARGFILE;

307

273

FILE *conffp;

308

274

size_t d_name_len;

309

275

DIR *dir = NULL;

332

298

ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);

333

299

if(ret == -1){

334

300

perror("sigaction");

335

exitstatus = EXIT_FAILURE;

301

exitstatus = EXIT_FAILURE;

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302

goto fallback;

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303

}

338

304

341

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

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

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

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

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

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.arg = "VAR=value",

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312

.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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315

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

350

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

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

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.arg = "PLUGIN:ENV=value",

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

353

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

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320

.arg = "PLUGIN",

355

321

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

356

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

357

.arg = "PLUGIN",

358

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

359

322

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

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323

.arg = "DIRECTORY",

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324

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

362

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

363

.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 },

325

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

326

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

327

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

328

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

329

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

330

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

331

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

332

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

373

333

{ .name = NULL }

374

334

};

375

335

376

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

377

struct argp_state *state) {

336

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

337

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

338

pointer to our plugin list pointer. */

339

plugin **plugins = state->input;

378

340

switch (key) {

379

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

341

case 'g':

380

342

if (arg != NULL){

381

343

char *p;

382

344

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

383

345

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

384

346

continue;

385

347

}

386

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

348

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

387

349

perror("add_argument");

388

350

return ARGP_ERR_UNKNOWN;

389

351

}

390

352

}

391

353

}

392

354

break;

393

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

355

case 'e':

394

356

if(arg == NULL){

395

357

break;

396

358

}

399

361

if(envdef == NULL){

400

362

break;

401

363

}

402

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

364

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

403

365

perror("add_environment");

404

366

}

405

367

}

406

368

break;

407

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

369

case 'o':

408

370

if (arg != NULL){

409

371

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

410

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

372

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

411

373

break;

412

374

}

413

375

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

414

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

376

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

415

377

break;

416

378

}

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;

379

if(opt != NULL){

380

char *p;

381

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

382

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

383

continue;

384

}

385

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

386

perror("add_argument");

387

return ARGP_ERR_UNKNOWN;

388

}

425

389

}

426

390

}

427

391

}

428

392

break;

429

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

393

case 'f':

430

394

if(arg == NULL){

431

395

break;

432

396

}

440

404

break;

441

405

}

442

406

envdef++;

443

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

407

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

444

408

perror("add_environment");

445

409

}

446

410

}

447

411

break;

448

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

412

case 'd':

449

413

if (arg != NULL){

450

plugin *p = getplugin(arg);

414

plugin *p = getplugin(arg, plugins);

451

415

if(p == NULL){

452

416

return ARGP_ERR_UNKNOWN;

453

417

}

454

418

p->disabled = true;

455

419

}

456

420

break;

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 */

421

case 128:

422

plugindir = arg;

423

break;

424

case 129:

476

425

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

477

426

break;

478

case 131: /* --groupid */

427

case 130:

479

428

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

480

429

break;

481

case 132: /* --debug */

430

case 131:

482

431

debug = true;

483

432

break;

484

433

case ARGP_KEY_ARG:

492

441

return 0;

493

442

}

494

443

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

}

444

plugin *plugin_list = NULL;

526

445

527

struct argp argp = { .options = options,

528

.parser = parse_opt_config_file,

529

.args_doc = "",

446

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

447

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

530

448

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

531

449

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);

450

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

535

451

if (ret == ARGP_ERR_UNKNOWN){

536

452

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

537

453

exitstatus = EXIT_FAILURE;

538

454

goto fallback;

539

455

}

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

}

456

457

conffp = fopen(argfile, "r");

550

458

if(conffp != NULL){

551

459

char *org_line = NULL;

552

460

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

555

463

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

556

464

const char comment_delim[] = "#";

557

465

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 */

570

466

while(true){

571

467

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

572

468

if(sret == -1){

580

476

continue;

581

477

}

582

478

new_arg = strdup(p);

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;

479

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

480

if (custom_argv == NULL){

481

perror("add_to_argv");

482

exitstatus = EXIT_FAILURE;

483

goto fallback;

484

}

601

485

}

602

486

}

603

487

free(org_line);

604

} else {

488

} else{

605

489

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

606

490

not affect opening plugins */

607

491

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

610

494

goto fallback;

611

495

}

612

496

}

613

/* If there was any arguments from configuration file,

614

pass them to parser as command arguments */

497

615

498

if(custom_argv != NULL){

616

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

617

0, NULL);

499

custom_argv[0] = argv[0];

500

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

618

501

if (ret == ARGP_ERR_UNKNOWN){

619

502

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

620

503

exitstatus = EXIT_FAILURE;

622

505

}

623

506

}

624

507

625

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

626

config file */

627

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

628

if (ret == ARGP_ERR_UNKNOWN){

629

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

630

exitstatus = EXIT_FAILURE;

631

goto fallback;

632

}

633

634

508

if(debug){

635

509

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

636

510

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

645

519

}

646

520

}

647

521

648

/* Strip permissions down to nobody */

649

522

ret = setuid(uid);

650

523

if (ret == -1){

651

524

perror("setuid");

652

}

525

}

526

653

527

setgid(gid);

654

528

if (ret == -1){

655

529

perror("setgid");

656

530

}

657

531

658

if (plugindir == NULL){

659

dir = opendir(PDIR);

660

} else {

661

dir = opendir(plugindir);

662

}

663

532

dir = opendir(plugindir);

664

533

if(dir == NULL){

665

534

perror("Could not open plugin dir");

666

535

exitstatus = EXIT_FAILURE;

682

551

683

552

FD_ZERO(&rfds_all);

684

553

685

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

686

554

while(true){

687

555

dirst = readdir(dir);

688

556

689

/* All directory entries have been processed */

557

// All directory entries have been processed

690

558

if(dirst == NULL){

691

559

if (errno == EBADF){

692

560

perror("readdir");

698

566

699

567

d_name_len = strlen(dirst->d_name);

700

568

701

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

569

// Ignore dotfiles, backup files and other junk

702

570

{

703

571

bool bad_name = false;

704

572

719

587

break;

720

588

}

721

589

}

590

722

591

if(bad_name){

723

592

continue;

724

593

}

594

725

595

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

726

596

size_t suf_len = strlen(*suf);

727

597

if((d_name_len >= suf_len)

742

612

}

743

613

744

614

char *filename;

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

}

615

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

750

616

if(ret < 0){

751

617

perror("asprintf");

752

618

continue;

758

624

free(filename);

759

625

continue;

760

626

}

761

762

/* Ignore non-executable files */

627

763

628

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

764

629

if(debug){

765

630

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

768

633

free(filename);

769

634

continue;

770

635

}

771

772

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

636

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

773

637

if(p == NULL){

774

638

perror("getplugin");

775

639

free(filename);

785

649

}

786

650

{

787

651

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

788

plugin *g = getplugin(NULL);

652

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

789

653

if(g != NULL){

790

654

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

791

655

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

794

658

}

795

659

/* Add global environment variables */

796

660

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

797

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

661

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

798

662

perror("add_environment");

799

663

}

800

664

}

805

669

process, too. */

806

670

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

807

671

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

808

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

672

char *copy = strdup(*e);

673

if(copy == NULL){

674

perror("strdup");

675

continue;

676

}

677

if(not add_environment(p, copy)){

809

678

perror("add_environment");

810

679

}

811

680

}

812

681

}

813

682

814

int pipefd[2];

683

int pipefd[2];

815

684

ret = pipe(pipefd);

816

685

if (ret == -1){

817

686

perror("pipe");

818

687

exitstatus = EXIT_FAILURE;

819

688

goto fallback;

820

689

}

821

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

822

690

ret = set_cloexec_flag(pipefd[0]);

823

691

if(ret < 0){

824

692

perror("set_cloexec_flag");

838

706

exitstatus = EXIT_FAILURE;

839

707

goto fallback;

840

708

}

841

/* Starting a new process to be watched */

709

// Starting a new process to be watched

842

710

pid_t pid = fork();

843

711

if(pid == -1){

844

712

perror("fork");

882

750

}

883

751

/* no return */

884

752

}

885

/* Parent process */

886

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

753

/* parent process */

887

754

free(filename);

888

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

889

if (new_plugin == NULL){

890

perror("getplugin");

755

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

756

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

757

if (new_process == NULL){

758

perror("malloc");

891

759

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

892

760

if(ret < 0){

893

perror("sigprocmask");

761

perror("sigprocmask");

894

762

}

895

763

exitstatus = EXIT_FAILURE;

896

764

goto fallback;

897

765

}

898

766

899

new_plugin->pid = pid;

900

new_plugin->fd = pipefd[0];

901

767

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

768

.fd = pipefd[0],

769

.next = process_list };

770

// List handling

771

process_list = new_process;

902

772

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

903

773

has already completed */

904

774

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

908

778

goto fallback;

909

779

}

910

780

911

FD_SET(new_plugin->fd, &rfds_all);

781

FD_SET(new_process->fd, &rfds_all);

912

782

913

if (maxfd < new_plugin->fd){

914

maxfd = new_plugin->fd;

783

if (maxfd < new_process->fd){

784

maxfd = new_process->fd;

915

785

}

916

786

917

787

}

918

788

789

free_plugin_list(plugin_list);

790

919

791

closedir(dir);

920

792

dir = 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

}

793

794

if (process_list == NULL){

795

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

796

" directory?\n");

797

process_list = NULL;

931

798

}

932

933

/* Main loop while running plugins exist */

934

while(plugin_list){

799

while(process_list){

935

800

fd_set rfds = rfds_all;

936

801

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

937

802

if (select_ret == -1){

941

806

}

942

807

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

943

808

from one of them */

944

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

809

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

945

810

/* Is this process completely done? */

946

811

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

947

812

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

948

813

if(not WIFEXITED(proc->status)

949

814

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

950

815

/* Bad exit by plugin */

951

952

816

if(debug){

953

817

if(WIFEXITED(proc->status)){

954

818

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

963

827

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

964

828

}

965

829

}

966

967

830

/* Remove the plugin */

968

831

FD_CLR(proc->fd, &rfds_all);

969

970

832

/* Block signal while modifying process_list */

971

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

833

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

972

834

if(ret < 0){

973

835

perror("sigprocmask");

974

836

exitstatus = EXIT_FAILURE;

975

837

goto fallback;

976

838

}

977

free_plugin(proc);

839

/* Delete this process entry from the list */

840

if(process_list == proc){

841

/* First one - simple */

842

process_list = proc->next;

843

} else {

844

/* Second one or later */

845

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

846

if(p->next == proc){

847

p->next = proc->next;

848

break;

849

}

850

}

851

}

978

852

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

979

853

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

980

854

NULL);

981

855

if(ret < 0){

982

856

perror("sigprocmask");

983

exitstatus = EXIT_FAILURE;

984

goto fallback;

985

}

986

987

if(plugin_list == NULL){

988

break;

989

}

990

continue;

857

}

858

free(proc->buffer);

859

free(proc);

860

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

861

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

862

the process list */

863

break;

991

864

}

992

993

865

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

994

866

995

bool bret = print_out_password(proc->buffer,

996

proc->buffer_length);

867

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

997

868

if(not bret){

998

869

perror("print_out_password");

999

870

exitstatus = EXIT_FAILURE;

1000

871

}

1001

872

goto fallback;

1002

873

}

1003

1004

874

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

1005

875

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

1006

876

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

1036

906

1037

907

fallback:

1038

908

1039

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

1040

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

1041

occured */

909

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

910

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

1042

911

bool bret;

1043

912

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

1044

913

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);

914

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

1052

915

if(not bret){

1053

916

perror("print_out_password");

1054

917

exitstatus = EXIT_FAILURE;

1063

926

}

1064

927

1065

928

if(custom_argv != NULL){

1066

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

929

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

1067

930

free(*arg);

1068

931

}

1069

932

free(custom_argv);

1070

933

}

934

free_plugin_list(plugin_list);

1071

935

1072

936

if(dir != NULL){

1073

937

closedir(dir);

1074

938

}

1075

939

1076

940

/* 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

}

941

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

942

next = process_list->next;

943

close(process_list->fd);

944

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

945

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

946

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

947

perror("kill");

1085

948

}

949

free(process_list->buffer);

950

free(process_list);

1086

951

}

1087

952

1088

953

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

1092

957

if(errno != ECHILD){

1093

958

perror("wait");

1094

959

}

1095

1096

free_plugin_list();

1097

1098

free(plugindir);

1099

free(argfile);

1100

960

1101

961

return exitstatus;

1102

962

}