/mandos/release : revision 24.1.134

64

sigprocmask(), SIG_BLOCK, SIGCHLD,

65

SIG_UNBLOCK, kill() */

66

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

67

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

67

68

69

#define BUFFER_SIZE 256

69

70

88

89

size_t buffer_size;

89

90

size_t buffer_length;

90

91

bool eof;

91

volatile bool completed;

92

volatile int status;

92

volatile sig_atomic_t completed;

93

int status;

93

94

struct plugin *next;

94

95

} plugin;

95

96

99

100

or if none is found, creates a new one */

100

101

static plugin *getplugin(char *name){

101

102

/* Check for exiting plugin with that name */

102

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

103

if ((p->name == name)

104

or (p->name and name and (strcmp(p->name, name) == 0))){

103

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

104

if((p->name == name)

105

or (p->name and name and (strcmp(p->name, name) == 0))){

105

106

return p;

106

107

}

107

108

}

108

109

/* Create a new plugin */

109

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plugin *new_plugin = malloc(sizeof(plugin));

110

if (new_plugin == NULL){

111

if(new_plugin == NULL){

111

112

return NULL;

112

113

}

113

114

char *copy_name = NULL;

114

115

if(name != NULL){

115

116

copy_name = strdup(name);

116

117

if(copy_name == NULL){

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free(new_plugin);

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return NULL;

118

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}

119

121

}

120

122

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

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.argc = 1,

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.disabled = false,

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.next = plugin_list };

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

124

.argc = 1,

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.disabled = false,

126

.next = plugin_list };

125

127

126

128

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

127

if (new_plugin->argv == NULL){

129

if(new_plugin->argv == NULL){

128

130

free(copy_name);

129

131

free(new_plugin);

130

132

return NULL;

221

223

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

222

224

status. */

223

225

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

226

int old_errno = errno;

224

227

while(true){

225

228

plugin *proc = plugin_list;

226

229

int status;

230

233

break;

231

234

}

232

235

if(pid == -1){

233

if (errno != ECHILD){

234

perror("waitpid");

236

if(errno == ECHILD){

237

/* No child processes */

238

break;

235

239

}

236

/* No child processes */

237

break;

240

perror("waitpid");

238

241

}

239

242

240

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

246

249

continue;

247

250

}

248

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proc->status = status;

249

proc->completed = true;

252

proc->completed = 1;

250

253

}

254

errno = old_errno;

251

255

}

252

256

253

257

/* Prints out a password to stdout */

308

312

struct dirent *dirst;

309

313

struct stat st;

310

314

fd_set rfds_all;

311

int ret, maxfd = 0;

315

int ret, numchars, maxfd = 0;

312

316

ssize_t sret;

317

intmax_t tmpmax;

313

318

uid_t uid = 65534;

314

319

gid_t gid = 65534;

315

320

bool debug = false;

372

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{ .name = NULL }

373

378

};

374

379

375

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

376

struct argp_state *state) {

377

switch (key) {

380

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

381

struct argp_state *state){

382

switch(key){

378

383

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

379

if (arg != NULL){

380

char *p;

381

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

382

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

384

if(arg != NULL){

385

char *plugin_option;

386

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

387

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

383

388

continue;

384

389

}

385

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

390

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

386

391

perror("add_argument");

387

392

return ARGP_ERR_UNKNOWN;

388

393

}

398

403

}

399

404

break;

400

405

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

401

if (arg != NULL){

402

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

403

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

404

break;

405

}

406

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

407

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

408

break;

409

}

410

char *p;

411

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

412

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

413

continue;

414

}

415

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

406

if(arg != NULL){

407

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

408

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

409

break;

410

}

411

char *plugin_option;

412

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

413

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

416

414

perror("add_argument");

417

415

return ARGP_ERR_UNKNOWN;

418

416

}

435

433

}

436

434

break;

437

435

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

438

if (arg != NULL){

436

if(arg != NULL){

439

437

plugin *p = getplugin(arg);

440

438

if(p == NULL){

441

439

return ARGP_ERR_UNKNOWN;

444

442

}

445

443

break;

446

444

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

447

if (arg != NULL){

445

if(arg != NULL){

448

446

plugin *p = getplugin(arg);

449

447

if(p == NULL){

450

448

return ARGP_ERR_UNKNOWN;

463

461

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

464

462

break;

465

463

case 130: /* --userid */

466

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

464

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

465

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

466

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

467

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

468

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

469

} else {

470

uid = (uid_t)tmpmax;

471

}

467

472

break;

468

473

case 131: /* --groupid */

469

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

474

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

475

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

476

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

477

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

478

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

479

} else {

480

gid = (gid_t)tmpmax;

481

}

470

482

break;

471

483

case 132: /* --debug */

472

484

debug = true;

473

485

break;

486

/*

487

* When adding more options before this line, remember to also add a

488

* "case" to the "parse_opt_config_file" function below.

489

*/

474

490

case ARGP_KEY_ARG:

475

491

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

476

492

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

489

505

490

506

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

491

507

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

492

error_t parse_opt_config_file (int key, char *arg,

493

__attribute__((unused))

494

struct argp_state *state) {

495

switch (key) {

508

error_t parse_opt_config_file(int key, char *arg,

509

__attribute__((unused))

510

struct argp_state *state){

511

switch(key){

496

512

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

497

513

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

498

514

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

525

541

.args_doc = "",

526

542

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

527

543

528

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

544

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

529

545

config file location, if any. */

530

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

531

if (ret == ARGP_ERR_UNKNOWN){

546

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

547

if(ret == ARGP_ERR_UNKNOWN){

532

548

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

533

549

exitstatus = EXIT_FAILURE;

534

550

goto fallback;

538

554

argp.parser = parse_opt;

539

555

540

556

/* Open the configfile if available */

541

if (argfile == NULL){

557

if(argfile == NULL){

542

558

conffp = fopen(AFILE, "r");

543

559

} else {

544

560

conffp = fopen(argfile, "r");

599

615

} else {

600

616

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

601

617

not affect opening plugins */

602

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

618

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

603

619

perror("fopen");

604

620

exitstatus = EXIT_FAILURE;

605

621

goto fallback;

608

624

/* If there was any arguments from configuration file,

609

625

pass them to parser as command arguments */

610

626

if(custom_argv != NULL){

611

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

612

0, NULL);

613

if (ret == ARGP_ERR_UNKNOWN){

627

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

628

0, NULL);

629

if(ret == ARGP_ERR_UNKNOWN){

614

630

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

615

631

exitstatus = EXIT_FAILURE;

616

632

goto fallback;

619

635

620

636

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

621

637

config file */

622

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

623

if (ret == ARGP_ERR_UNKNOWN){

638

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

639

if(ret == ARGP_ERR_UNKNOWN){

624

640

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

625

641

exitstatus = EXIT_FAILURE;

626

642

goto fallback;

633

649

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

634

650

fprintf(stderr, "\tArg: %s\n", *a);

635

651

}

636

fprintf(stderr, "...and %u environment variables\n", p->envc);

652

fprintf(stderr, "...and %d environment variables\n", p->envc);

637

653

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

638

654

fprintf(stderr, "\t%s\n", *a);

639

655

}

641

657

}

642

658

643

659

/* Strip permissions down to nobody */

660

setgid(gid);

661

if(ret == -1){

662

perror("setgid");

663

}

644

664

ret = setuid(uid);

645

if (ret == -1){

665

if(ret == -1){

646

666

perror("setuid");

647

}

648

setgid(gid);

649

if (ret == -1){

650

perror("setgid");

651

667

}

652

668

653

if (plugindir == NULL){

669

if(plugindir == NULL){

654

670

dir = opendir(PDIR);

655

671

} else {

656

672

dir = opendir(plugindir);

683

699

684

700

/* All directory entries have been processed */

685

701

if(dirst == NULL){

686

if (errno == EBADF){

702

if(errno == EBADF){

687

703

perror("readdir");

688

704

exitstatus = EXIT_FAILURE;

689

705

goto fallback;

749

765

}

750

766

751

767

ret = stat(filename, &st);

752

if (ret == -1){

768

if(ret == -1){

753

769

perror("stat");

754

770

free(filename);

755

771

continue;

756

772

}

757

773

758

774

/* Ignore non-executable files */

759

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

775

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

760

776

if(debug){

761

777

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

762

778

" with bad type or mode\n", filename);

809

825

810

826

int pipefd[2];

811

827

ret = pipe(pipefd);

812

if (ret == -1){

828

if(ret == -1){

813

829

perror("pipe");

814

830

exitstatus = EXIT_FAILURE;

815

831

goto fallback;

828

844

goto fallback;

829

845

}

830

846

/* Block SIGCHLD until process is safely in process list */

831

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

847

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

832

848

if(ret < 0){

833

849

perror("sigprocmask");

834

850

exitstatus = EXIT_FAILURE;

882

898

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

883

899

free(filename);

884

900

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

885

if (new_plugin == NULL){

901

if(new_plugin == NULL){

886

902

perror("getplugin");

887

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

903

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

888

904

if(ret < 0){

889

905

perror("sigprocmask");

890

906

}

897

913

898

914

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

899

915

has already completed */

900

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

916

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

901

917

if(ret < 0){

902

918

perror("sigprocmask");

903

919

exitstatus = EXIT_FAILURE;

906

922

907

923

FD_SET(new_plugin->fd, &rfds_all);

908

924

909

if (maxfd < new_plugin->fd){

925

if(maxfd < new_plugin->fd){

910

926

maxfd = new_plugin->fd;

911

927

}

912

928

}

913

929

914

930

closedir(dir);

915

931

dir = NULL;

932

free_plugin(getplugin(NULL));

916

933

917

934

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

918

935

if(p->pid != 0){

929

946

while(plugin_list){

930

947

fd_set rfds = rfds_all;

931

948

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

932

if (select_ret == -1){

949

if(select_ret == -1){

933

950

perror("select");

934

951

exitstatus = EXIT_FAILURE;

935

952

goto fallback;

938

955

from one of them */

939

956

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

940

957

/* Is this process completely done? */

941

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

958

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

942

959

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

943

960

if(not WIFEXITED(proc->status)

944

961

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

946

963

947

964

if(debug){

948

965

if(WIFEXITED(proc->status)){

949

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

950

(unsigned int) (proc->pid),

966

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

967

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

968

(intmax_t) (proc->pid),

951

969

WEXITSTATUS(proc->status));

952

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

953

fprintf(stderr, "Plugin %u killed by signal %d\n",

954

(unsigned int) (proc->pid),

970

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

971

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

972

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

973

(intmax_t) (proc->pid),

955

974

WTERMSIG(proc->status));

956

975

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

957

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

958

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

976

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

977

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

959

978

}

960

979

}

961

980

975

994

proc = next_plugin;

976

995

977

996

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

978

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

979

NULL);

997

ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

998

NULL);

980

999

if(ret < 0){

981

1000

perror("sigprocmask");

982

1001

exitstatus = EXIT_FAILURE;

1011

1030

if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){

1012

1031

proc->buffer = realloc(proc->buffer, proc->buffer_size

1013

1032

+ (size_t) BUFFER_SIZE);

1014

if (proc->buffer == NULL){

1033

if(proc->buffer == NULL){

1015

1034

perror("malloc");

1016

1035

exitstatus = EXIT_FAILURE;

1017

1036

goto fallback;