/mandos/trunk : revision 252

64

sigprocmask(), SIG_BLOCK, SIGCHLD,

65

SIG_UNBLOCK, kill() */

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

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

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#define BUFFER_SIZE 256

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100

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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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.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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break;

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}

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if(pid == -1){

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if(errno != ECHILD){

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if (errno != ECHILD){

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perror("waitpid");

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}

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/* No child processes */

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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, numchars, maxfd = 0;

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ssize_t sret;

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intmax_t tmpmax;

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int ret, maxfd = 0;

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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) {

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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) {

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

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if(arg != NULL){

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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'){

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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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if (arg != NULL){

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

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

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break;

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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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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'){

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

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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'){

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

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break;

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case 132: /* --debug */

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debug = true;

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break;

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/*

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* 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. */

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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) {

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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) {

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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 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. */

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

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if(ret == ARGP_ERR_UNKNOWN){

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

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if (ret == ARGP_ERR_UNKNOWN){

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531

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

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exitstatus = EXIT_FAILURE;

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goto fallback;

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argp.parser = parse_opt;

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/* Open the configfile if available */

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if(argfile == NULL){

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if (argfile == NULL){

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541

conffp = fopen(AFILE, "r");

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} else {

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conffp = fopen(argfile, "r");

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char *org_line = NULL;

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char *p, *arg, *new_arg, *line;

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size_t size = 0;

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ssize_t sret;

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const char whitespace_delims[] = " \r\t\f\v\n";

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const char comment_delim[] = "#";

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} else {

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

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not affect opening plugins */

623

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

602

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

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perror("fopen");

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exitstatus = EXIT_FAILURE;

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goto fallback;

629

608

/* If there was any arguments from configuration file,

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pass them to parser as command arguments */

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if(custom_argv != NULL){

632

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

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0, NULL);

634

if(ret == ARGP_ERR_UNKNOWN){

611

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

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0, NULL);

613

if (ret == ARGP_ERR_UNKNOWN){

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

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615

exitstatus = EXIT_FAILURE;

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goto fallback;

640

619

641

620

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

642

621

config file */

643

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

644

if(ret == ARGP_ERR_UNKNOWN){

622

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

623

if (ret == ARGP_ERR_UNKNOWN){

645

624

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

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625

exitstatus = EXIT_FAILURE;

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626

goto fallback;

654

633

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

655

634

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

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635

}

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

636

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

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

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638

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

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639

}

663

642

664

643

/* Strip permissions down to nobody */

665

644

ret = setuid(uid);

666

if(ret == -1){

645

if (ret == -1){

667

646

perror("setuid");

668

647

}

669

648

setgid(gid);

670

if(ret == -1){

649

if (ret == -1){

671

650

perror("setgid");

672

651

}

673

652

674

if(plugindir == NULL){

653

if (plugindir == NULL){

675

654

dir = opendir(PDIR);

676

655

} else {

677

656

dir = opendir(plugindir);

704

683

705

684

/* All directory entries have been processed */

706

685

if(dirst == NULL){

707

if(errno == EBADF){

686

if (errno == EBADF){

708

687

perror("readdir");

709

688

exitstatus = EXIT_FAILURE;

710

689

goto fallback;

770

749

}

771

750

772

751

ret = stat(filename, &st);

773

if(ret == -1){

752

if (ret == -1){

774

753

perror("stat");

775

754

free(filename);

776

755

continue;

777

756

}

778

757

779

758

/* Ignore non-executable files */

780

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)){

781

760

if(debug){

782

761

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

783

762

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

830

809

831

810

int pipefd[2];

832

811

ret = pipe(pipefd);

833

if(ret == -1){

812

if (ret == -1){

834

813

perror("pipe");

835

814

exitstatus = EXIT_FAILURE;

836

815

goto fallback;

849

828

goto fallback;

850

829

}

851

830

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

852

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

831

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

853

832

if(ret < 0){

854

833

perror("sigprocmask");

855

834

exitstatus = EXIT_FAILURE;

903

882

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

904

883

free(filename);

905

884

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

906

if(new_plugin == NULL){

885

if (new_plugin == NULL){

907

886

perror("getplugin");

908

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

887

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

909

888

if(ret < 0){

910

889

perror("sigprocmask");

911

890

}

918

897

919

898

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

920

899

has already completed */

921

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

900

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

922

901

if(ret < 0){

923

902

perror("sigprocmask");

924

903

exitstatus = EXIT_FAILURE;

927

906

928

907

FD_SET(new_plugin->fd, &rfds_all);

929

908

930

if(maxfd < new_plugin->fd){

909

if (maxfd < new_plugin->fd){

931

910

maxfd = new_plugin->fd;

932

911

}

933

912

}

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;

967

946

968

947

if(debug){

969

948

if(WIFEXITED(proc->status)){

970

fprintf(stderr, "Plugin %" PRIdMAX " exited with status"

971

" %d\n", (intmax_t) (proc->pid),

949

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

950

(unsigned int) (proc->pid),

972

951

WEXITSTATUS(proc->status));

973

952

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

974

fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"

975

" %d\n", (intmax_t) (proc->pid),

953

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

954

(unsigned int) (proc->pid),

976

955

WTERMSIG(proc->status));

977

956

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

978

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

979

(intmax_t) (proc->pid));

957

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

958

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

980

959

}

981

960

}

982

961

996

975

proc = next_plugin;

997

976

998

977

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

999

ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

1000

NULL);

978

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

979

NULL);

1001

980

if(ret < 0){

1002

981

perror("sigprocmask");

1003

982

exitstatus = EXIT_FAILURE;

1032

1011

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

1033

1012

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

1034

1013

+ (size_t) BUFFER_SIZE);

1035

if(proc->buffer == NULL){

1014

if (proc->buffer == NULL){

1036

1015

perror("malloc");

1037

1016

exitstatus = EXIT_FAILURE;

1038

1017

goto fallback;

1040

1019

proc->buffer_size += BUFFER_SIZE;

1041

1020

}

1042

1021

/* Read from the process */

1043

sret = read(proc->fd, proc->buffer + proc->buffer_length,

1044

BUFFER_SIZE);

1045

if(sret < 0){

1022

ret = read(proc->fd, proc->buffer + proc->buffer_length,

1023

BUFFER_SIZE);

1024

if(ret < 0){

1046

1025

/* Read error from this process; ignore the error */

1047

1026

proc = proc->next;

1048

1027

continue;

1049

1028

}

1050

if(sret == 0){

1029

if(ret == 0){

1051

1030

/* got EOF */

1052

1031

proc->eof = true;

1053

1032

} else {

1054

proc->buffer_length += (size_t) sret;

1033

proc->buffer_length += (size_t) ret;

1055

1034

}

1056

1035

}

1057

1036

}