/mandos/trunk : revision 24.1.139

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/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */

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/* -*- coding: utf-8 -*- */

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/*

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* Mandos plugin runner - Run Mandos plugins

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*

54

#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,

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FD_CLOEXEC */

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#include <string.h> /* strsep, strlen(), asprintf(),

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strsignal(), strcmp(), strncmp() */

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strsignal() */

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

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#include <argp.h> /* struct argp_option, struct

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argp_state, struct argp,

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}

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}

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/* Create a new plugin */

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plugin *new_plugin = NULL;

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do {

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new_plugin = malloc(sizeof(plugin));

116

} while(new_plugin == NULL and errno == EINTR);

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

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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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do {

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copy_name = strdup(name);

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} while(copy_name == NULL and errno == EINTR);

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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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.disabled = false,

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.next = plugin_list };

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do {

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

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} while(new_plugin->argv == NULL and errno == EINTR);

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

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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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new_plugin->argv[0] = copy_name;

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new_plugin->argv[1] = NULL;

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do {

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new_plugin->environ = malloc(sizeof(char *));

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} while(new_plugin->environ == NULL and errno == EINTR);

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new_plugin->environ = malloc(sizeof(char *));

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if(new_plugin->environ == NULL){

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free(copy_name);

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free(new_plugin->argv);

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static bool add_to_char_array(const char *new, char ***array,

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int *len){

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/* Resize the pointed-to array to hold one more pointer */

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do {

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*array = realloc(*array, sizeof(char *)

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* (size_t) ((*len) + 2));

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} while(*array == NULL and errno == EINTR);

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*array = realloc(*array, sizeof(char *)

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* (size_t) ((*len) + 2));

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/* Malloc check */

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if(*array == NULL){

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return false;

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}

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/* Make a copy of the new string */

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char *copy;

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do {

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copy = strdup(new);

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} while(copy == NULL and errno == EINTR);

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char *copy = strdup(new);

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if(copy == NULL){

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return false;

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}

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if(strncmp(*e, def, namelen + 1) == 0){

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/* It already exists */

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if(replace){

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char *new;

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do {

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new = realloc(*e, strlen(def) + 1);

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} while(new == NULL and errno == EINTR);

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char *new = realloc(*e, strlen(def) + 1);

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if(new == NULL){

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return false;

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}

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/*

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* Based on the example in the GNU LibC manual chapter 13.13 "File

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* Descriptor Flags".

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| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

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* *Note File Descriptor Flags:(libc)Descriptor Flags.

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*/

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static int set_cloexec_flag(int fd){

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int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

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int ret = fcntl(fd, F_GETFD, 0);

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/* If reading the flags failed, return error indication now. */

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if(ret < 0){

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return ret;

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}

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/* Store modified flag word in the descriptor. */

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return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

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ret | FD_CLOEXEC));

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return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);

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}

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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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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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char *tmp;

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intmax_t tmpmax;

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

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if(arg != NULL){

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char *plugin_option;

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custom_argv[custom_argc] = NULL;

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}

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619

}

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do {

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ret = fclose(conffp);

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} while(ret == EOF and errno == EINTR);

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if(ret == EOF){

642

perror("fclose");

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exitstatus = EXIT_FAILURE;

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goto fallback;

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}

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free(org_line);

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} else {

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

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/* Read and execute any executable in the plugin directory*/

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while(true){

730

do {

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dirst = readdir(dir);

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} while(dirst == NULL and errno == EINTR);

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dirst = readdir(dir);

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/* All directory entries have been processed */

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if(dirst == NULL){

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for(const char **suf = bad_suffixes; *suf != NULL; suf++){

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size_t suf_len = strlen(*suf);

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if((d_name_len >= suf_len)

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and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)

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and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)

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== 0)){

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if(debug){

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

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char *filename;

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if(plugindir == NULL){

792

ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",

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dirst->d_name));

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ret = asprintf(&filename, PDIR "/%s", dirst->d_name);

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765

} else {

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ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",

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plugindir,

797

dirst->d_name));

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ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);

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767

}

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if(ret < 0){

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perror("asprintf");

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continue;

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}

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ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));

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ret = stat(filename, &st);

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if(ret == -1){

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perror("stat");

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free(filename);

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}

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/* Ignore non-executable files */

812

if(not S_ISREG(st.st_mode)

813

or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){

781

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

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if(debug){

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783

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

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784

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

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}

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int pipefd[2];

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ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));

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ret = pipe(pipefd);

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if(ret == -1){

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perror("pipe");

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exitstatus = EXIT_FAILURE;

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goto fallback;

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}

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

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ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,

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&sigchld_action.sa_mask,

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NULL));

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

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if(ret < 0){

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perror("sigprocmask");

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exitstatus = EXIT_FAILURE;

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goto fallback;

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}

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/* Starting a new process to be watched */

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pid_t pid;

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do {

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pid = fork();

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} while(pid == -1 and errno == EINTR);

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pid_t pid = fork();

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if(pid == -1){

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perror("fork");

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exitstatus = EXIT_FAILURE;

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/* no return */

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}

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/* Parent process */

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

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pipe */

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

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free(filename);

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

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if(new_plugin == NULL){

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perror("getplugin");

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ret = (int)(TEMP_FAILURE_RETRY

948

(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

949

NULL)));

909

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

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if(ret < 0){

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911

perror("sigprocmask");

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}

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

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has already completed */

962

ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

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&sigchld_action.sa_mask,

964

NULL));

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

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if(ret < 0){

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perror("sigprocmask");

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exitstatus = EXIT_FAILURE;

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goto fallback;

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}

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FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from

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-Wconversion */

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FD_SET(new_plugin->fd, &rfds_all);

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930

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if(maxfd < new_plugin->fd){

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maxfd = new_plugin->fd;

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}

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}

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TEMP_FAILURE_RETRY(closedir(dir));

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closedir(dir);

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dir = NULL;

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free_plugin(getplugin(NULL));

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939

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while(plugin_list){

996

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fd_set rfds = rfds_all;

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

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if(select_ret == -1 and errno != EINTR){

955

if(select_ret == -1){

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perror("select");

1000

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exitstatus = EXIT_FAILURE;

1001

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goto fallback;

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986

}

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/* Remove the plugin */

1032

FD_CLR(proc->fd, &rfds_all); /* Spurious warning from

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-Wconversion */

989

FD_CLR(proc->fd, &rfds_all);

1034

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991

/* Block signal while modifying process_list */

1036

ret = (int)TEMP_FAILURE_RETRY(sigprocmask

1037

(SIG_BLOCK,

1038

&sigchld_action.sa_mask,

1039

NULL));

992

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

1040

993

if(ret < 0){

1041

994

perror("sigprocmask");

1042

995

exitstatus = EXIT_FAILURE;

1048

1001

proc = next_plugin;

1049

1002

1050

1003

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

1051

ret = (int)(TEMP_FAILURE_RETRY

1052

(sigprocmask(SIG_UNBLOCK,

1053

&sigchld_action.sa_mask, NULL)));

1004

ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

1005

NULL);

1054

1006

if(ret < 0){

1055

1007

perror("sigprocmask");

1056

1008

exitstatus = EXIT_FAILURE;

1076

1028

}

1077

1029

1078

1030

/* This process has not completed. Does it have any output? */

1079

if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious

1080

warning from

1081

-Wconversion */

1031

if(proc->eof or not FD_ISSET(proc->fd, &rfds)){

1082

1032

/* This process had nothing to say at this time */

1083

1033

proc = proc->next;

1084

1034

continue;

1095

1045

proc->buffer_size += BUFFER_SIZE;

1096

1046

}

1097

1047

/* Read from the process */

1098

sret = TEMP_FAILURE_RETRY(read(proc->fd,

1099

proc->buffer

1100

+ proc->buffer_length,

1101

BUFFER_SIZE));

1048

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

1049

BUFFER_SIZE);

1102

1050

if(sret < 0){

1103

1051

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

1104

1052

proc = proc->next;

1166

1114

}

1167

1115

1168

1116

/* Wait for any remaining child processes to terminate */

1169

do {

1117

do{

1170

1118

ret = wait(NULL);

1171

1119

} while(ret >= 0);

1172

1120

if(errno != ECHILD){