/mandos/release : revision 254

62

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

63

sigaddset(), sigaction(),

64

sigprocmask(), SIG_BLOCK, SIGCHLD,

65

SIG_UNBLOCK, kill() */

65

SIG_UNBLOCK, kill(), sig_atomic_t

66

*/

66

67

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

67

#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */

68

#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */

68

69

70

#define BUFFER_SIZE 256

70

71

81

82

char **environ;

82

83

int envc;

83

84

bool disabled;

84

85

86

/* Variables used for running processes*/

86

87

pid_t pid;

87

88

int fd;

89

90

size_t buffer_size;

90

91

size_t buffer_length;

91

92

bool eof;

92

volatile bool completed;

93

volatile int status;

93

volatile sig_atomic_t completed;

94

int status;

94

95

struct plugin *next;

95

96

} plugin;

96

97

120

121

}

121

122

}

122

123

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

124

.argc = 1,

125

.disabled = false,

126

.next = plugin_list };

124

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

125

.argc = 1,

126

.disabled = false,

127

.next = plugin_list };

127

128

129

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

129

130

if(new_plugin->argv == NULL){

223

224

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

224

225

status. */

225

226

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

227

int old_errno = errno;

226

228

while(true){

227

229

plugin *proc = plugin_list;

228

230

int status;

232

234

break;

233

235

}

234

236

if(pid == -1){

235

if(errno != ECHILD){

236

perror("waitpid");

237

if(errno == ECHILD){

238

/* No child processes */

239

break;

237

240

}

238

/* No child processes */

239

break;

241

perror("waitpid");

240

242

}

241

243

242

244

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

248

250

continue;

249

251

}

250

252

proc->status = status;

251

proc->completed = true;

253

proc->completed = 1;

252

254

}

255

errno = old_errno;

253

256

}

254

257

255

258

/* Prints out a password to stdout */

277

280

}

278

281

free(plugin_node->environ);

279

282

free(plugin_node->buffer);

280

283

281

284

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

282

285

if(plugin_node == plugin_list){

283

286

/* First one - simple */

310

313

struct dirent *dirst;

311

314

struct stat st;

312

315

fd_set rfds_all;

313

int ret, numchars, maxfd = 0;

316

int ret, maxfd = 0;

314

317

ssize_t sret;

315

318

intmax_t tmpmax;

316

319

uid_t uid = 65534;

376

379

};

377

380

378

381

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

379

struct argp_state *state) {

380

switch(key) {

382

struct argp_state *state){

383

char *tmp;

384

switch(key){

381

385

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

382

386

if(arg != NULL){

383

char *p;

384

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

385

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

387

char *plugin_option;

388

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

389

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

386

390

continue;

387

391

}

388

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

392

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

389

393

perror("add_argument");

390

394

return ARGP_ERR_UNKNOWN;

391

395

}

402

406

break;

403

407

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

404

408

if(arg != NULL){

405

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

406

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

407

break;

408

}

409

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

410

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

411

break;

412

}

413

char *p;

414

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

415

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

416

continue;

417

}

418

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

409

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

410

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

411

break;

412

}

413

char *plugin_option;

414

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

415

if(not add_argument(getplugin(plugin_name), plugin_option)){

419

416

perror("add_argument");

420

417

return ARGP_ERR_UNKNOWN;

421

418

}

466

463

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

467

464

break;

468

465

case 130: /* --userid */

469

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

470

if(ret < 1 or tmpmax != (uid_t)tmpmax

471

or arg[numchars] != '\0'){

466

errno = 0;

467

tmpmax = strtoimax(arg, &tmp, 10);

468

if(errno != 0 or tmp == arg or *tmp != '\0'

469

or tmpmax != (uid_t)tmpmax){

472

470

fprintf(stderr, "Bad user ID number: \"%s\", using %"

473

471

PRIdMAX "\n", arg, (intmax_t)uid);

474

472

} else {

476

474

}

477

475

break;

478

476

case 131: /* --groupid */

479

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

480

if(ret < 1 or tmpmax != (gid_t)tmpmax

481

or arg[numchars] != '\0'){

477

errno = 0;

478

tmpmax = strtoimax(arg, &tmp, 10);

479

if(errno != 0 or tmp == arg or *tmp != '\0'

480

or tmpmax != (gid_t)tmpmax){

482

481

fprintf(stderr, "Bad group ID number: \"%s\", using %"

483

482

PRIdMAX "\n", arg, (intmax_t)gid);

484

483

} else {

512

511

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

513

512

error_t parse_opt_config_file(int key, char *arg,

514

513

__attribute__((unused))

515

struct argp_state *state) {

516

switch(key) {

514

struct argp_state *state){

515

switch(key){

517

516

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

518

517

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

519

518

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

570

569

size_t size = 0;

571

570

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

572

571

const char comment_delim[] = "#";

573

572

574

573

custom_argc = 1;

575

574

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

576

575

if(custom_argv == NULL){

580

579

}

581

580

custom_argv[0] = argv[0];

582

581

custom_argv[1] = NULL;

583

582

584

583

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

585

584

commented text */

586

585

while(true){

588

587

if(sret == -1){

589

588

break;

590

589

}

591

590

592

591

line = org_line;

593

592

arg = strsep(&line, comment_delim);

594

593

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

662

661

}

663

662

664

663

/* Strip permissions down to nobody */

664

setgid(gid);

665

if(ret == -1){

666

perror("setgid");

667

}

665

668

ret = setuid(uid);

666

669

if(ret == -1){

667

670

perror("setuid");

668

}

669

setgid(gid);

670

if(ret == -1){

671

perror("setgid");

672

671

}

673

672

674

673

if(plugindir == NULL){

757

756

continue;

758

757

}

759

758

}

760

759

761

760

char *filename;

762

761

if(plugindir == NULL){

763

762

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

775

774

free(filename);

776

775

continue;

777

776

}

778

777

779

778

/* Ignore non-executable files */

780

779

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

781

780

if(debug){

934

933

935

934

closedir(dir);

936

935

dir = NULL;

936

free_plugin(getplugin(NULL));

937

938

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

939

if(p->pid != 0){

959

from one of them */

960

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

961

/* Is this process completely done? */

962

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

962

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

963

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

964

if(not WIFEXITED(proc->status)

965

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

966

/* Bad exit by plugin */

967

968

if(debug){

969

if(WIFEXITED(proc->status)){

970

fprintf(stderr, "Plugin %" PRIdMAX " exited with status"

971

" %d\n", (intmax_t) (proc->pid),

970

fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"

971

" status %d\n", proc->name,

972

(intmax_t) (proc->pid),

972

973

WEXITSTATUS(proc->status));

973

} else if(WIFSIGNALED(proc->status)) {

974

fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"

975

" %d\n", (intmax_t) (proc->pid),

974

} else if(WIFSIGNALED(proc->status)){

975

fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"

976

" signal %d\n", proc->name,

977

(intmax_t) (proc->pid),

976

978

WTERMSIG(proc->status));

977

979

} else if(WCOREDUMP(proc->status)){

978

fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",

979

(intmax_t) (proc->pid));

980

fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"

981

" core\n", proc->name, (intmax_t) (proc->pid));

980

982

}

981

983

}

982

984

983

985

/* Remove the plugin */

984

986

FD_CLR(proc->fd, &rfds_all);

985

987

986

988

/* Block signal while modifying process_list */

987

989

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

988

990

if(ret < 0){

1055

1057

}

1056

1058

}

1057

1059

}

1058

1059

1060

1061

1060

1062

fallback:

1061

1063

1062

1064

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