/mandos/trunk : revision 294

64

sigprocmask(), SIG_BLOCK, SIGCHLD,

65

SIG_UNBLOCK, kill() */

66

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

67

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

67

68

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#define BUFFER_SIZE 256

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99

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

100

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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){

103

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)

105

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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112

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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break;

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}

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if(pid == -1){

233

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 */

308

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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;

313

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) {

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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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401

}

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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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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'){

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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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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;

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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 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. */

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

530

if (ret == ARGP_ERR_UNKNOWN){

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

552

if(ret == ARGP_ERR_UNKNOWN){

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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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539

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/* Open the configfile if available */

540

if (argfile == NULL){

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if(argfile == NULL){

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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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569

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

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570

size_t size = 0;

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ssize_t sret;

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571

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

551

572

const char comment_delim[] = "#";

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573

599

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} else {

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621

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

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622

not affect opening plugins */

602

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

623

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

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624

perror("fopen");

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625

exitstatus = EXIT_FAILURE;

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626

goto fallback;

608

629

/* If there was any arguments from configuration file,

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pass them to parser as command arguments */

610

631

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){

632

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

633

0, NULL);

634

if(ret == ARGP_ERR_UNKNOWN){

614

635

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

615

636

exitstatus = EXIT_FAILURE;

616

637

goto fallback;

619

640

620

641

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

621

642

config file */

622

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

623

if (ret == ARGP_ERR_UNKNOWN){

643

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

644

if(ret == ARGP_ERR_UNKNOWN){

624

645

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

625

646

exitstatus = EXIT_FAILURE;

626

647

goto fallback;

633

654

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

634

655

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

635

656

}

636

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

657

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

637

658

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

638

659

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

639

660

}

642

663

643

664

/* Strip permissions down to nobody */

644

665

ret = setuid(uid);

645

if (ret == -1){

666

if(ret == -1){

646

667

perror("setuid");

647

668

}

648

669

setgid(gid);

649

if (ret == -1){

670

if(ret == -1){

650

671

perror("setgid");

651

672

}

652

673

653

if (plugindir == NULL){

674

if(plugindir == NULL){

654

675

dir = opendir(PDIR);

655

676

} else {

656

677

dir = opendir(plugindir);

683

704

684

705

/* All directory entries have been processed */

685

706

if(dirst == NULL){

686

if (errno == EBADF){

707

if(errno == EBADF){

687

708

perror("readdir");

688

709

exitstatus = EXIT_FAILURE;

689

710

goto fallback;

749

770

}

750

771

751

772

ret = stat(filename, &st);

752

if (ret == -1){

773

if(ret == -1){

753

774

perror("stat");

754

775

free(filename);

755

776

continue;

756

777

}

757

778

758

779

/* Ignore non-executable files */

759

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

780

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

760

781

if(debug){

761

782

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

762

783

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

809

830

810

831

int pipefd[2];

811

832

ret = pipe(pipefd);

812

if (ret == -1){

833

if(ret == -1){

813

834

perror("pipe");

814

835

exitstatus = EXIT_FAILURE;

815

836

goto fallback;

828

849

goto fallback;

829

850

}

830

851

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

831

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

852

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

832

853

if(ret < 0){

833

854

perror("sigprocmask");

834

855

exitstatus = EXIT_FAILURE;

882

903

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

883

904

free(filename);

884

905

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

885

if (new_plugin == NULL){

906

if(new_plugin == NULL){

886

907

perror("getplugin");

887

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

908

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

888

909

if(ret < 0){

889

910

perror("sigprocmask");

890

911

}

897

918

898

919

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

899

920

has already completed */

900

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

921

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

901

922

if(ret < 0){

902

923

perror("sigprocmask");

903

924

exitstatus = EXIT_FAILURE;

906

927

907

928

FD_SET(new_plugin->fd, &rfds_all);

908

929

909

if (maxfd < new_plugin->fd){

930

if(maxfd < new_plugin->fd){

910

931

maxfd = new_plugin->fd;

911

932

}

912

933

}

929

950

while(plugin_list){

930

951

fd_set rfds = rfds_all;

931

952

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

932

if (select_ret == -1){

953

if(select_ret == -1){

933

954

perror("select");

934

955

exitstatus = EXIT_FAILURE;

935

956

goto fallback;

946

967

947

968

if(debug){

948

969

if(WIFEXITED(proc->status)){

949

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

950

(unsigned int) (proc->pid),

970

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

971

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

951

972

WEXITSTATUS(proc->status));

952

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

953

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

954

(unsigned int) (proc->pid),

973

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

974

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

975

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

955

976

WTERMSIG(proc->status));

956

977

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

957

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

958

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

978

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

979

(intmax_t) (proc->pid));

959

980

}

960

981

}

961

982

975

996

proc = next_plugin;

976

997

977

998

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

978

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

979

NULL);

999

ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

1000

NULL);

980

1001

if(ret < 0){

981

1002

perror("sigprocmask");

982

1003

exitstatus = EXIT_FAILURE;

1011

1032

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

1012

1033

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

1013

1034

+ (size_t) BUFFER_SIZE);

1014

if (proc->buffer == NULL){

1035

if(proc->buffer == NULL){

1015

1036

perror("malloc");

1016

1037

exitstatus = EXIT_FAILURE;

1017

1038

goto fallback;

1019

1040

proc->buffer_size += BUFFER_SIZE;

1020

1041

}

1021

1042

/* Read from the process */

1022

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

1023

BUFFER_SIZE);

1024

if(ret < 0){

1043

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

1044

BUFFER_SIZE);

1045

if(sret < 0){

1025

1046

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

1026

1047

proc = proc->next;

1027

1048

continue;

1028

1049

}

1029

if(ret == 0){

1050

if(sret == 0){

1030

1051

/* got EOF */

1031

1052

proc->eof = true;

1032

1053

} else {

1033

proc->buffer_length += (size_t) ret;

1054

proc->buffer_length += (size_t) sret;

1034

1055

}

1035

1056

}

1036

1057

}