/mandos/trunk : revision 267

99

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

100

static plugin *getplugin(char *name){

101

/* 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))){

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))){

105

return p;

106

}

107

}

108

/* Create a new plugin */

109

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

110

if (new_plugin == NULL){

110

if(new_plugin == NULL){

111

return NULL;

112

}

113

char *copy_name = NULL;

124

.next = plugin_list };

125

126

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

127

if (new_plugin->argv == NULL){

127

if(new_plugin->argv == NULL){

128

free(copy_name);

129

free(new_plugin);

130

return NULL;

230

break;

231

}

232

if(pid == -1){

233

if (errno != ECHILD){

233

if(errno != ECHILD){

234

perror("waitpid");

235

}

236

/* No child processes */

372

{ .name = NULL }

373

};

374

375

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

376

struct argp_state *state) {

377

switch (key) {

375

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

376

struct argp_state *state) {

377

switch(key) {

378

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

379

if (arg != NULL){

379

if(arg != NULL){

380

char *p;

381

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

382

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

398

}

399

break;

400

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

401

if (arg != NULL){

401

if(arg != NULL){

402

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

403

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

404

break;

435

}

436

break;

437

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

438

if (arg != NULL){

438

if(arg != NULL){

439

plugin *p = getplugin(arg);

440

if(p == NULL){

441

return ARGP_ERR_UNKNOWN;

444

}

445

break;

446

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

447

if (arg != NULL){

447

if(arg != NULL){

448

plugin *p = getplugin(arg);

449

if(p == NULL){

450

return ARGP_ERR_UNKNOWN;

463

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

464

break;

465

case 130: /* --userid */

466

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

466

/* In the GNU C library, uid_t is always unsigned int */

467

ret = sscanf(arg, "%u", &uid);

468

if(ret != 1){

469

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

470

uid);

471

}

467

472

break;

468

473

case 131: /* --groupid */

469

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

474

/* In the GNU C library, gid_t is always unsigned int */

475

ret = sscanf(arg, "%u", &gid);

476

if(ret != 1){

477

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

478

arg, gid);

479

}

470

480

break;

471

481

case 132: /* --debug */

472

482

debug = true;

473

483

break;

484

/*

485

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

486

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

487

*/

474

488

case ARGP_KEY_ARG:

475

489

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

476

490

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

489

503

490

504

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

491

505

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) {

506

error_t parse_opt_config_file(int key, char *arg,

507

__attribute__((unused))

508

struct argp_state *state) {

509

switch(key) {

496

510

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

497

511

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

498

512

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

525

539

.args_doc = "",

526

540

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

527

541

528

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

542

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

529

543

config file location, if any. */

530

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

531

if (ret == ARGP_ERR_UNKNOWN){

544

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

545

if(ret == ARGP_ERR_UNKNOWN){

532

546

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

533

547

exitstatus = EXIT_FAILURE;

534

548

goto fallback;

538

552

argp.parser = parse_opt;

539

553

540

554

/* Open the configfile if available */

541

if (argfile == NULL){

555

if(argfile == NULL){

542

556

conffp = fopen(AFILE, "r");

543

557

} else {

544

558

conffp = fopen(argfile, "r");

599

613

} else {

600

614

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

601

615

not affect opening plugins */

602

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

616

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

603

617

perror("fopen");

604

618

exitstatus = EXIT_FAILURE;

605

619

goto fallback;

608

622

/* If there was any arguments from configuration file,

609

623

pass them to parser as command arguments */

610

624

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){

625

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

626

0, NULL);

627

if(ret == ARGP_ERR_UNKNOWN){

614

628

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

615

629

exitstatus = EXIT_FAILURE;

616

630

goto fallback;

619

633

620

634

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

621

635

config file */

622

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

623

if (ret == ARGP_ERR_UNKNOWN){

636

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

637

if(ret == ARGP_ERR_UNKNOWN){

624

638

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

625

639

exitstatus = EXIT_FAILURE;

626

640

goto fallback;

642

656

643

657

/* Strip permissions down to nobody */

644

658

ret = setuid(uid);

645

if (ret == -1){

659

if(ret == -1){

646

660

perror("setuid");

647

661

}

648

662

setgid(gid);

649

if (ret == -1){

663

if(ret == -1){

650

664

perror("setgid");

651

665

}

652

666

653

if (plugindir == NULL){

667

if(plugindir == NULL){

654

668

dir = opendir(PDIR);

655

669

} else {

656

670

dir = opendir(plugindir);

683

697

684

698

/* All directory entries have been processed */

685

699

if(dirst == NULL){

686

if (errno == EBADF){

700

if(errno == EBADF){

687

701

perror("readdir");

688

702

exitstatus = EXIT_FAILURE;

689

703

goto fallback;

749

763

}

750

764

751

765

ret = stat(filename, &st);

752

if (ret == -1){

766

if(ret == -1){

753

767

perror("stat");

754

768

free(filename);

755

769

continue;

756

770

}

757

771

758

772

/* Ignore non-executable files */

759

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

773

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

760

774

if(debug){

761

775

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

762

776

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

809

823

810

824

int pipefd[2];

811

825

ret = pipe(pipefd);

812

if (ret == -1){

826

if(ret == -1){

813

827

perror("pipe");

814

828

exitstatus = EXIT_FAILURE;

815

829

goto fallback;

828

842

goto fallback;

829

843

}

830

844

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

831

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

845

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

832

846

if(ret < 0){

833

847

perror("sigprocmask");

834

848

exitstatus = EXIT_FAILURE;

882

896

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

883

897

free(filename);

884

898

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

885

if (new_plugin == NULL){

899

if(new_plugin == NULL){

886

900

perror("getplugin");

887

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

901

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

888

902

if(ret < 0){

889

903

perror("sigprocmask");

890

904

}

897

911

898

912

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

899

913

has already completed */

900

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

914

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

901

915

if(ret < 0){

902

916

perror("sigprocmask");

903

917

exitstatus = EXIT_FAILURE;

906

920

907

921

FD_SET(new_plugin->fd, &rfds_all);

908

922

909

if (maxfd < new_plugin->fd){

923

if(maxfd < new_plugin->fd){

910

924

maxfd = new_plugin->fd;

911

925

}

912

926

}

929

943

while(plugin_list){

930

944

fd_set rfds = rfds_all;

931

945

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

932

if (select_ret == -1){

946

if(select_ret == -1){

933

947

perror("select");

934

948

exitstatus = EXIT_FAILURE;

935

949

goto fallback;

954

968

(unsigned int) (proc->pid),

955

969

WTERMSIG(proc->status));

956

970

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

957

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

971

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

958

972

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

959

973

}

960

974

}

975

989

proc = next_plugin;

976

990

977

991

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

978

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

979

NULL);

992

ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

993

NULL);

980

994

if(ret < 0){

981

995

perror("sigprocmask");

982

996

exitstatus = EXIT_FAILURE;

1011

1025

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

1012

1026

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

1013

1027

+ (size_t) BUFFER_SIZE);

1014

if (proc->buffer == NULL){

1028

if(proc->buffer == NULL){

1015

1029

perror("malloc");

1016

1030

exitstatus = EXIT_FAILURE;

1017

1031

goto fallback;