/mandos/trunk : revision 308

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 */

68

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

67

69

68

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#define BUFFER_SIZE 256

69

71

88

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size_t buffer_size;

89

91

size_t buffer_length;

90

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bool eof;

91

volatile bool completed;

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volatile int status;

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volatile sig_atomic_t completed;

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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));

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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;

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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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perror("waitpid");

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if(errno == ECHILD){

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/* No child processes */

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break;

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}

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/* No child processes */

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break;

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perror("waitpid");

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}

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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 = true;

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proc->completed = 1;

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}

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errno = old_errno;

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}

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/* Prints out a password to stdout */

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struct dirent *dirst;

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struct stat st;

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fd_set rfds_all;

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int ret, maxfd = 0;

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int ret, numchars, 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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switch (key) {

381

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

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struct argp_state *state){

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switch(key){

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

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if (arg != NULL){

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char *p;

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

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

385

if(arg != NULL){

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char *plugin_option;

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

388

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

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continue;

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}

385

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

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

386

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perror("add_argument");

387

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return ARGP_ERR_UNKNOWN;

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394

}

398

404

}

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break;

400

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

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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)){

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)){

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perror("add_argument");

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return ARGP_ERR_UNKNOWN;

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}

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}

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break;

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

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if (arg != NULL){

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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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}

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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);

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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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case 130: /* --userid */

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

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

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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);

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} else {

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uid = (uid_t)tmpmax;

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}

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break;

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case 131: /* --groupid */

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

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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'){

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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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}

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break;

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case 132: /* --debug */

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debug = true;

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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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*/

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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. */

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) {

509

error_t parse_opt_config_file(int key, char *arg,

510

__attribute__((unused))

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struct argp_state *state){

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switch(key){

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

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

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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 the parse_opt_config_file in order to get the custom

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

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config file location, if any. */

530

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

531

if (ret == ARGP_ERR_UNKNOWN){

547

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

548

if(ret == ARGP_ERR_UNKNOWN){

532

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

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550

exitstatus = EXIT_FAILURE;

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goto fallback;

538

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argp.parser = parse_opt;

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540

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/* Open the configfile if available */

541

if (argfile == NULL){

558

if(argfile == NULL){

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conffp = fopen(AFILE, "r");

543

560

} else {

544

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conffp = fopen(argfile, "r");

599

616

} else {

600

617

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

601

618

not affect opening plugins */

602

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

619

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

603

620

perror("fopen");

604

621

exitstatus = EXIT_FAILURE;

605

622

goto fallback;

608

625

/* If there was any arguments from configuration file,

609

626

pass them to parser as command arguments */

610

627

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){

628

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

629

0, NULL);

630

if(ret == ARGP_ERR_UNKNOWN){

614

631

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

615

632

exitstatus = EXIT_FAILURE;

616

633

goto fallback;

619

636

620

637

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

621

638

config file */

622

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

623

if (ret == ARGP_ERR_UNKNOWN){

639

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

640

if(ret == ARGP_ERR_UNKNOWN){

624

641

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

625

642

exitstatus = EXIT_FAILURE;

626

643

goto fallback;

633

650

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

634

651

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

635

652

}

636

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

653

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

637

654

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

638

655

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

639

656

}

641

658

}

642

659

643

660

/* Strip permissions down to nobody */

661

setgid(gid);

662

if(ret == -1){

663

perror("setgid");

664

}

644

665

ret = setuid(uid);

645

if (ret == -1){

666

if(ret == -1){

646

667

perror("setuid");

647

}

648

setgid(gid);

649

if (ret == -1){

650

perror("setgid");

651

668

}

652

669

653

if (plugindir == NULL){

670

if(plugindir == NULL){

654

671

dir = opendir(PDIR);

655

672

} else {

656

673

dir = opendir(plugindir);

683

700

684

701

/* All directory entries have been processed */

685

702

if(dirst == NULL){

686

if (errno == EBADF){

703

if(errno == EBADF){

687

704

perror("readdir");

688

705

exitstatus = EXIT_FAILURE;

689

706

goto fallback;

749

766

}

750

767

751

768

ret = stat(filename, &st);

752

if (ret == -1){

769

if(ret == -1){

753

770

perror("stat");

754

771

free(filename);

755

772

continue;

756

773

}

757

774

758

775

/* Ignore non-executable files */

759

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

776

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

760

777

if(debug){

761

778

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

762

779

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

809

826

810

827

int pipefd[2];

811

828

ret = pipe(pipefd);

812

if (ret == -1){

829

if(ret == -1){

813

830

perror("pipe");

814

831

exitstatus = EXIT_FAILURE;

815

832

goto fallback;

828

845

goto fallback;

829

846

}

830

847

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

831

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

848

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

832

849

if(ret < 0){

833

850

perror("sigprocmask");

834

851

exitstatus = EXIT_FAILURE;

882

899

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

883

900

free(filename);

884

901

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

885

if (new_plugin == NULL){

902

if(new_plugin == NULL){

886

903

perror("getplugin");

887

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

904

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

888

905

if(ret < 0){

889

906

perror("sigprocmask");

890

907

}

897

914

898

915

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

899

916

has already completed */

900

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

917

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

901

918

if(ret < 0){

902

919

perror("sigprocmask");

903

920

exitstatus = EXIT_FAILURE;

906

923

907

924

FD_SET(new_plugin->fd, &rfds_all);

908

925

909

if (maxfd < new_plugin->fd){

926

if(maxfd < new_plugin->fd){

910

927

maxfd = new_plugin->fd;

911

928

}

912

929

}

913

930

914

931

closedir(dir);

915

932

dir = NULL;

933

free_plugin(getplugin(NULL));

916

934

917

935

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

918

936

if(p->pid != 0){

929

947

while(plugin_list){

930

948

fd_set rfds = rfds_all;

931

949

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

932

if (select_ret == -1){

950

if(select_ret == -1){

933

951

perror("select");

934

952

exitstatus = EXIT_FAILURE;

935

953

goto fallback;

938

956

from one of them */

939

957

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

940

958

/* Is this process completely done? */

941

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

959

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

942

960

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

943

961

if(not WIFEXITED(proc->status)

944

962

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

946

964

947

965

if(debug){

948

966

if(WIFEXITED(proc->status)){

949

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

950

(unsigned int) (proc->pid),

967

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

968

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

969

(intmax_t) (proc->pid),

951

970

WEXITSTATUS(proc->status));

952

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

953

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

954

(unsigned int) (proc->pid),

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),

955

975

WTERMSIG(proc->status));

956

976

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

957

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

958

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

977

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

978

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

959

979

}

960

980

}

961

981

975

995

proc = next_plugin;

976

996

977

997

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

978

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

979

NULL);

998

ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

999

NULL);

980

1000

if(ret < 0){

981

1001

perror("sigprocmask");

982

1002

exitstatus = EXIT_FAILURE;

1011

1031

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

1012

1032

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

1013

1033

+ (size_t) BUFFER_SIZE);

1014

if (proc->buffer == NULL){

1034

if(proc->buffer == NULL){

1015

1035

perror("malloc");

1016

1036

exitstatus = EXIT_FAILURE;

1017

1037

goto fallback;