/mandos/trunk : revision 261

62

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

63

sigaddset(), sigaction(),

64

sigprocmask(), SIG_BLOCK, SIGCHLD,

65

SIG_UNBLOCK, kill(), sig_atomic_t

66

*/

65

SIG_UNBLOCK, kill() */

67

66

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

68

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

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67

70

68

#define BUFFER_SIZE 256

71

69

90

88

size_t buffer_size;

91

89

size_t buffer_length;

92

90

bool eof;

93

volatile sig_atomic_t completed;

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int status;

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volatile bool completed;

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volatile int status;

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struct plugin *next;

96

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} plugin;

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101

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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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if((p->name == name)

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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))){

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return p;

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}

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}

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/* Create a new plugin */

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

112

if(new_plugin == NULL){

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if (new_plugin == NULL){

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return NULL;

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}

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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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free(new_plugin);

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return NULL;

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}

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}

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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,

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

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if(new_plugin->argv == NULL){

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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;

224

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

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status. */

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

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int old_errno = errno;

228

224

while(true){

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plugin *proc = plugin_list;

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int status;

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break;

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}

236

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if(pid == -1){

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if(errno == ECHILD){

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/* No child processes */

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break;

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if (errno != ECHILD){

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perror("waitpid");

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235

}

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perror("waitpid");

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/* No child processes */

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break;

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}

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

250

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continue;

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}

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proc->status = status;

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proc->completed = 1;

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proc->completed = true;

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}

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errno = old_errno;

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251

}

257

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/* Prints out a password to stdout */

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struct dirent *dirst;

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struct stat st;

315

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fd_set rfds_all;

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int ret, numchars, maxfd = 0;

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int ret, maxfd = 0;

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ssize_t sret;

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intmax_t tmpmax;

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uid_t uid = 65534;

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gid_t gid = 65534;

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bool debug = false;

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{ .name = NULL }

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};

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

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struct argp_state *state){

383

switch(key){

375

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

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struct argp_state *state) {

377

switch (key) {

384

378

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

385

if(arg != NULL){

386

char *plugin_option;

387

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

388

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

379

if (arg != NULL){

380

char *p;

381

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

382

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

389

383

continue;

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}

391

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

385

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

392

386

perror("add_argument");

393

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return ARGP_ERR_UNKNOWN;

394

388

}

404

398

}

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break;

406

400

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

407

if(arg != NULL){

408

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

409

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

410

break;

411

}

412

char *plugin_option;

413

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

414

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

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)){

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perror("add_argument");

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return ARGP_ERR_UNKNOWN;

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}

434

435

}

435

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break;

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

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if(arg != NULL){

438

if (arg != NULL){

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plugin *p = getplugin(arg);

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if(p == NULL){

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return ARGP_ERR_UNKNOWN;

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444

}

444

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break;

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446

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

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if(arg != NULL){

447

if (arg != NULL){

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plugin *p = getplugin(arg);

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if(p == NULL){

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return ARGP_ERR_UNKNOWN;

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

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break;

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465

case 130: /* --userid */

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

466

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

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

468

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

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

470

} else {

471

uid = (uid_t)tmpmax;

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}

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

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467

break;

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case 131: /* --groupid */

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

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

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

478

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

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

480

} else {

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gid = (gid_t)tmpmax;

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}

469

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

483

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break;

484

471

case 132: /* --debug */

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472

debug = true;

486

473

break;

487

/*

488

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

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

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*/

491

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case ARGP_KEY_ARG:

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475

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

493

476

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

506

489

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

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491

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

509

error_t parse_opt_config_file(int key, char *arg,

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__attribute__((unused))

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struct argp_state *state){

512

switch(key){

492

error_t parse_opt_config_file (int key, char *arg,

493

__attribute__((unused))

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struct argp_state *state) {

495

switch (key) {

513

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

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

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498

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

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.args_doc = "",

543

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

544

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

528

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

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529

config file location, if any. */

547

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

548

if(ret == ARGP_ERR_UNKNOWN){

530

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

531

if (ret == ARGP_ERR_UNKNOWN){

549

532

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

550

533

exitstatus = EXIT_FAILURE;

551

534

goto fallback;

555

538

argp.parser = parse_opt;

556

539

557

540

/* Open the configfile if available */

558

if(argfile == NULL){

541

if (argfile == NULL){

559

542

conffp = fopen(AFILE, "r");

560

543

} else {

561

544

conffp = fopen(argfile, "r");

616

599

} else {

617

600

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

618

601

not affect opening plugins */

619

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

602

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

620

603

perror("fopen");

621

604

exitstatus = EXIT_FAILURE;

622

605

goto fallback;

625

608

/* If there was any arguments from configuration file,

626

609

pass them to parser as command arguments */

627

610

if(custom_argv != NULL){

628

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

629

0, NULL);

630

if(ret == ARGP_ERR_UNKNOWN){

611

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

612

0, NULL);

613

if (ret == ARGP_ERR_UNKNOWN){

631

614

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

632

615

exitstatus = EXIT_FAILURE;

633

616

goto fallback;

636

619

637

620

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

638

621

config file */

639

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

640

if(ret == ARGP_ERR_UNKNOWN){

622

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

623

if (ret == ARGP_ERR_UNKNOWN){

641

624

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

642

625

exitstatus = EXIT_FAILURE;

643

626

goto fallback;

650

633

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

651

634

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

652

635

}

653

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

636

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

654

637

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

655

638

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

656

639

}

658

641

}

659

642

660

643

/* Strip permissions down to nobody */

644

ret = setuid(uid);

645

if (ret == -1){

646

perror("setuid");

647

}

661

648

setgid(gid);

662

if(ret == -1){

649

if (ret == -1){

663

650

perror("setgid");

664

651

}

665

ret = setuid(uid);

666

if(ret == -1){

667

perror("setuid");

668

}

669

652

670

if(plugindir == NULL){

653

if (plugindir == NULL){

671

654

dir = opendir(PDIR);

672

655

} else {

673

656

dir = opendir(plugindir);

700

683

701

684

/* All directory entries have been processed */

702

685

if(dirst == NULL){

703

if(errno == EBADF){

686

if (errno == EBADF){

704

687

perror("readdir");

705

688

exitstatus = EXIT_FAILURE;

706

689

goto fallback;

766

749

}

767

750

768

751

ret = stat(filename, &st);

769

if(ret == -1){

752

if (ret == -1){

770

753

perror("stat");

771

754

free(filename);

772

755

continue;

773

756

}

774

757

775

758

/* Ignore non-executable files */

776

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

759

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

777

760

if(debug){

778

761

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

779

762

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

826

809

827

810

int pipefd[2];

828

811

ret = pipe(pipefd);

829

if(ret == -1){

812

if (ret == -1){

830

813

perror("pipe");

831

814

exitstatus = EXIT_FAILURE;

832

815

goto fallback;

845

828

goto fallback;

846

829

}

847

830

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

848

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

831

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

849

832

if(ret < 0){

850

833

perror("sigprocmask");

851

834

exitstatus = EXIT_FAILURE;

899

882

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

900

883

free(filename);

901

884

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

902

if(new_plugin == NULL){

885

if (new_plugin == NULL){

903

886

perror("getplugin");

904

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

887

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

905

888

if(ret < 0){

906

889

perror("sigprocmask");

907

890

}

914

897

915

898

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

916

899

has already completed */

917

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

900

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

918

901

if(ret < 0){

919

902

perror("sigprocmask");

920

903

exitstatus = EXIT_FAILURE;

923

906

924

907

FD_SET(new_plugin->fd, &rfds_all);

925

908

926

if(maxfd < new_plugin->fd){

909

if (maxfd < new_plugin->fd){

927

910

maxfd = new_plugin->fd;

928

911

}

929

912

}

930

913

931

914

closedir(dir);

932

915

dir = NULL;

933

free_plugin(getplugin(NULL));

934

916

935

917

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

936

918

if(p->pid != 0){

947

929

while(plugin_list){

948

930

fd_set rfds = rfds_all;

949

931

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

950

if(select_ret == -1){

932

if (select_ret == -1){

951

933

perror("select");

952

934

exitstatus = EXIT_FAILURE;

953

935

goto fallback;

956

938

from one of them */

957

939

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

958

940

/* Is this process completely done? */

959

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

941

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

960

942

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

961

943

if(not WIFEXITED(proc->status)

962

944

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

964

946

965

947

if(debug){

966

948

if(WIFEXITED(proc->status)){

967

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

968

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

969

(intmax_t) (proc->pid),

949

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

950

(unsigned int) (proc->pid),

970

951

WEXITSTATUS(proc->status));

971

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

972

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

973

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

974

(intmax_t) (proc->pid),

952

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

953

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

954

(unsigned int) (proc->pid),

975

955

WTERMSIG(proc->status));

976

956

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

977

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

978

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

957

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

958

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

979

959

}

980

960

}

981

961

995

975

proc = next_plugin;

996

976

997

977

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

998

ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

999

NULL);

978

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

979

NULL);

1000

980

if(ret < 0){

1001

981

perror("sigprocmask");

1002

982

exitstatus = EXIT_FAILURE;

1031

1011

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

1032

1012

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

1033

1013

+ (size_t) BUFFER_SIZE);

1034

if(proc->buffer == NULL){

1014

if (proc->buffer == NULL){

1035

1015

perror("malloc");

1036

1016

exitstatus = EXIT_FAILURE;

1037

1017

goto fallback;