/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, PRIdMAX, strtoimax() */

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67

70

68

#define BUFFER_SIZE 256

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90

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size_t buffer_size;

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size_t buffer_length;

92

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bool eof;

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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;

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} plugin;

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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))){

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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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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;

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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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}

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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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238

}

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

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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

}

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/* Prints out a password to stdout */

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fd_set rfds_all;

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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){

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char *tmp;

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switch(key){

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

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struct argp_state *state) {

377

switch (key) {

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378

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

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if(arg != NULL){

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char *plugin_option;

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

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

379

if (arg != NULL){

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char *p;

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

382

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

390

383

continue;

391

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}

392

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

385

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

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386

perror("add_argument");

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return ARGP_ERR_UNKNOWN;

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388

}

405

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}

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break;

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

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if(arg != NULL){

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

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

411

break;

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}

413

char *plugin_option;

414

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

415

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)){

416

perror("add_argument");

417

return ARGP_ERR_UNKNOWN;

418

}

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);

440

if(p == NULL){

441

return ARGP_ERR_UNKNOWN;

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}

445

break;

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

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if(arg != NULL){

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if (arg != NULL){

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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;

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case 130: /* --userid */

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errno = 0;

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

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

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or tmpmax != (uid_t)tmpmax){

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

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

472

} else {

473

uid = (uid_t)tmpmax;

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}

466

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

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467

break;

476

468

case 131: /* --groupid */

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errno = 0;

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

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

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or tmpmax != (gid_t)tmpmax){

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

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

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} else {

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gid = (gid_t)tmpmax;

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}

469

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

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break;

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471

case 132: /* --debug */

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472

debug = true;

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473

break;

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/*

491

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

492

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

493

*/

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case ARGP_KEY_ARG:

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

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

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

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

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error_t parse_opt_config_file(int key, char *arg,

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__attribute__((unused))

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struct argp_state *state){

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switch(key){

492

error_t parse_opt_config_file (int key, char *arg,

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__attribute__((unused))

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struct argp_state *state) {

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switch (key) {

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496

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 = "",

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

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

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

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config file location, if any. */

550

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

551

if(ret == ARGP_ERR_UNKNOWN){

530

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

531

if (ret == ARGP_ERR_UNKNOWN){

552

532

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

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exitstatus = EXIT_FAILURE;

554

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goto fallback;

558

538

argp.parser = parse_opt;

559

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560

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/* Open the configfile if available */

561

if(argfile == NULL){

541

if (argfile == NULL){

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542

conffp = fopen(AFILE, "r");

563

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} else {

564

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conffp = fopen(argfile, "r");

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599

} else {

620

600

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

621

601

not affect opening plugins */

622

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

602

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

623

603

perror("fopen");

624

604

exitstatus = EXIT_FAILURE;

625

605

goto fallback;

628

608

/* If there was any arguments from configuration file,

629

609

pass them to parser as command arguments */

630

610

if(custom_argv != NULL){

631

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

632

0, NULL);

633

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){

634

614

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

635

615

exitstatus = EXIT_FAILURE;

636

616

goto fallback;

639

619

640

620

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

641

621

config file */

642

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

643

if(ret == ARGP_ERR_UNKNOWN){

622

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

623

if (ret == ARGP_ERR_UNKNOWN){

644

624

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

645

625

exitstatus = EXIT_FAILURE;

646

626

goto fallback;

653

633

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

654

634

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

655

635

}

656

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

636

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

657

637

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

658

638

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

659

639

}

661

641

}

662

642

663

643

/* Strip permissions down to nobody */

644

ret = setuid(uid);

645

if (ret == -1){

646

perror("setuid");

647

}

664

648

setgid(gid);

665

if(ret == -1){

649

if (ret == -1){

666

650

perror("setgid");

667

651

}

668

ret = setuid(uid);

669

if(ret == -1){

670

perror("setuid");

671

}

672

652

673

if(plugindir == NULL){

653

if (plugindir == NULL){

674

654

dir = opendir(PDIR);

675

655

} else {

676

656

dir = opendir(plugindir);

703

683

704

684

/* All directory entries have been processed */

705

685

if(dirst == NULL){

706

if(errno == EBADF){

686

if (errno == EBADF){

707

687

perror("readdir");

708

688

exitstatus = EXIT_FAILURE;

709

689

goto fallback;

769

749

}

770

750

771

751

ret = stat(filename, &st);

772

if(ret == -1){

752

if (ret == -1){

773

753

perror("stat");

774

754

free(filename);

775

755

continue;

776

756

}

777

757

778

758

/* Ignore non-executable files */

779

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)){

780

760

if(debug){

781

761

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

782

762

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

829

809

830

810

int pipefd[2];

831

811

ret = pipe(pipefd);

832

if(ret == -1){

812

if (ret == -1){

833

813

perror("pipe");

834

814

exitstatus = EXIT_FAILURE;

835

815

goto fallback;

848

828

goto fallback;

849

829

}

850

830

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

851

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

831

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

852

832

if(ret < 0){

853

833

perror("sigprocmask");

854

834

exitstatus = EXIT_FAILURE;

902

882

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

903

883

free(filename);

904

884

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

905

if(new_plugin == NULL){

885

if (new_plugin == NULL){

906

886

perror("getplugin");

907

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

887

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

908

888

if(ret < 0){

909

889

perror("sigprocmask");

910

890

}

917

897

918

898

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

919

899

has already completed */

920

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

900

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

921

901

if(ret < 0){

922

902

perror("sigprocmask");

923

903

exitstatus = EXIT_FAILURE;

926

906

927

907

FD_SET(new_plugin->fd, &rfds_all);

928

908

929

if(maxfd < new_plugin->fd){

909

if (maxfd < new_plugin->fd){

930

910

maxfd = new_plugin->fd;

931

911

}

932

912

}

933

913

934

914

closedir(dir);

935

915

dir = NULL;

936

free_plugin(getplugin(NULL));

937

916

938

917

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

939

918

if(p->pid != 0){

950

929

while(plugin_list){

951

930

fd_set rfds = rfds_all;

952

931

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

953

if(select_ret == -1){

932

if (select_ret == -1){

954

933

perror("select");

955

934

exitstatus = EXIT_FAILURE;

956

935

goto fallback;

959

938

from one of them */

960

939

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

961

940

/* Is this process completely done? */

962

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

941

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

963

942

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

964

943

if(not WIFEXITED(proc->status)

965

944

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

967

946

968

947

if(debug){

969

948

if(WIFEXITED(proc->status)){

970

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

971

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

972

(intmax_t) (proc->pid),

949

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

950

(unsigned int) (proc->pid),

973

951

WEXITSTATUS(proc->status));

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),

952

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

953

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

954

(unsigned int) (proc->pid),

978

955

WTERMSIG(proc->status));

979

956

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

980

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

981

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

957

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

958

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

982

959

}

983

960

}

984

961

998

975

proc = next_plugin;

999

976

1000

977

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

1001

ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

1002

NULL);

978

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

979

NULL);

1003

980

if(ret < 0){

1004

981

perror("sigprocmask");

1005

982

exitstatus = EXIT_FAILURE;

1034

1011

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

1035

1012

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

1036

1013

+ (size_t) BUFFER_SIZE);

1037

if(proc->buffer == NULL){

1014

if (proc->buffer == NULL){

1038

1015

perror("malloc");

1039

1016

exitstatus = EXIT_FAILURE;

1040

1017

goto fallback;