38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
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FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
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#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
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#include <iso646.h> /* and, or, not */
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#include <dirent.h> /* DIR, struct dirent, opendir(),
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#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
#include <string.h> /* strsep, strlen(), asprintf() */
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#include <string.h> /* strsep, strlen(), asprintf(),
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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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#include <signal.h> /* struct sigaction, sigemptyset(),
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sigaddset(), sigaction(),
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sigprocmask(), SIG_BLOCK, SIGCHLD,
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SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
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#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
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72
#define BUFFER_SIZE 256
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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 */
102
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))){
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
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or (p->name and name and (strcmp(p->name, name) == 0))){
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112
/* Create a new plugin */
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
113
plugin *new_plugin = NULL;
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
113
120
char *copy_name = NULL;
114
121
if(name != NULL){
115
copy_name = strdup(name);
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
116
125
if(copy_name == NULL){
121
*new_plugin = (plugin) { .name = copy_name,
124
.next = plugin_list };
131
*new_plugin = (plugin){ .name = copy_name,
134
.next = plugin_list };
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
139
if(new_plugin->argv == NULL){
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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;
135
new_plugin->environ = malloc(sizeof(char *));
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
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if(new_plugin->environ == NULL){
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free(new_plugin->argv);
150
164
static bool add_to_char_array(const char *new, char ***array,
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/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
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* (size_t) ((*len) + 2));
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
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/* Malloc check */
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if(*array == NULL){
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/* Make a copy of the new string */
160
char *copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
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if(copy == NULL){
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208
if(strncmp(*e, def, namelen + 1) == 0){
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/* It already exists */
192
char *new = realloc(*e, strlen(def) + 1);
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
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228
* Based on the example in the GNU LibC manual chapter 13.13 "File
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229
* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
232
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
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/* If reading the flags failed, return error indication now. */
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/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
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/* Mark processes as completed when they exit, and save their exit
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static void handle_sigchld(__attribute__((unused)) int sig){
247
int old_errno = errno;
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plugin *proc = plugin_list;
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
378
405
case 'g': /* --global-options */
381
while((p = strsep(&arg, ",")) != NULL){
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
385
if(not add_argument(getplugin(NULL), p)){
412
if(not add_argument(getplugin(NULL), plugin_option)){
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413
perror("add_argument");
387
414
return ARGP_ERR_UNKNOWN;
400
427
case 'o': /* --options-for */
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
411
while((p = strsep(&opt, ",")) != NULL){
415
if(not add_argument(getplugin(p_name), p)){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
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436
perror("add_argument");
417
437
return ARGP_ERR_UNKNOWN;
457
477
plugindir = strdup(arg);
458
478
if(plugindir == NULL){
459
479
perror("strdup");
462
482
case 129: /* --config-file */
463
483
/* This is already done by parse_opt_config_file() */
465
485
case 130: /* --userid */
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%ud", &uid);
469
fprintf(stderr, "Bad user ID number: \"%s\", using %ud\n",
487
tmpmax = strtoimax(arg, &tmp, 10);
488
if(errno != 0 or tmp == arg or *tmp != '\0'
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
473
496
case 131: /* --groupid */
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%ud", &gid);
477
fprintf(stderr, "Bad group ID number: \"%s\", using %ud\n",
498
tmpmax = strtoimax(arg, &tmp, 10);
499
if(errno != 0 or tmp == arg or *tmp != '\0'
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
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507
case 132: /* --debug */
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530
/* This option parser is the same as parse_opt() above, except it
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531
ignores everything but the --config-file option. */
506
error_t parse_opt_config_file (int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
532
error_t parse_opt_config_file(int key, char *arg,
533
__attribute__((unused))
534
struct argp_state *state){
510
536
case 'g': /* --global-options */
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537
case 'G': /* --global-env */
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538
case 'o': /* --options-for */
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566
.doc = "Mandos plugin runner -- Run plugins" };
542
/* Parse using the parse_opt_config_file in order to get the custom
568
/* Parse using parse_opt_config_file() in order to get the custom
543
569
config file location, if any. */
544
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if (ret == ARGP_ERR_UNKNOWN){
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unknown error while parsing arguments\n");
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573
exitstatus = EXIT_FAILURE;
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578
argp.parser = parse_opt;
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/* Open the configfile if available */
555
if (argfile == NULL){
556
582
conffp = fopen(AFILE, "r");
558
584
conffp = fopen(argfile, "r");
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if(conffp != NULL){
561
587
char *org_line = NULL;
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char *p, *arg, *new_arg, *line;
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const char whitespace_delims[] = " \r\t\f\v\n";
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const char comment_delim[] = "#";
568
594
custom_argv = malloc(sizeof(char*) * 2);
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if(custom_argv == NULL){
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634
custom_argv[custom_argc-1] = new_arg;
609
custom_argv[custom_argc] = NULL;
635
custom_argv[custom_argc] = NULL;
639
ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
643
exitstatus = EXIT_FAILURE;
614
648
/* Check for harmful errors and go to fallback. Other errors might
615
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not affect opening plugins */
616
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
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exitstatus = EXIT_FAILURE;
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656
/* If there was any arguments from configuration file,
623
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pass them to parser as command arguments */
624
658
if(custom_argv != NULL){
625
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
627
if (ret == ARGP_ERR_UNKNOWN){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
661
if(ret == ARGP_ERR_UNKNOWN){
628
662
fprintf(stderr, "Unknown error while parsing arguments\n");
629
663
exitstatus = EXIT_FAILURE;
634
668
/* Parse actual command line arguments, to let them override the
636
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if (ret == ARGP_ERR_UNKNOWN){
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
638
672
fprintf(stderr, "Unknown error while parsing arguments\n");
639
673
exitstatus = EXIT_FAILURE;
647
681
for(char **a = p->argv; *a != NULL; a++){
648
682
fprintf(stderr, "\tArg: %s\n", *a);
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
651
685
for(char **a = p->environ; *a != NULL; a++){
652
686
fprintf(stderr, "\t%s\n", *a);
755
791
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
761
800
perror("asprintf");
765
ret = stat(filename, &st);
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
772
811
/* Ignore non-executable files */
773
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
775
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
776
816
" with bad type or mode\n", filename);
844
884
/* Block SIGCHLD until process is safely in process list */
845
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
&sigchld_action.sa_mask,
847
889
perror("sigprocmask");
848
890
exitstatus = EXIT_FAILURE;
851
893
/* Starting a new process to be watched */
897
} while(pid == -1 and errno == EINTR);
855
900
exitstatus = EXIT_FAILURE;
895
940
/* Parent process */
896
close(pipefd[1]); /* Close unused write end of pipe */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
898
944
plugin *new_plugin = getplugin(dirst->d_name);
899
if (new_plugin == NULL){
945
if(new_plugin == NULL){
900
946
perror("getplugin");
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
947
ret = (int)(TEMP_FAILURE_RETRY
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
903
951
perror("sigprocmask");
912
960
/* Unblock SIGCHLD so signal handler can be run if this process
913
961
has already completed */
914
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
916
966
perror("sigprocmask");
917
967
exitstatus = EXIT_FAILURE;
921
971
FD_SET(new_plugin->fd, &rfds_all);
923
if (maxfd < new_plugin->fd){
973
if(maxfd < new_plugin->fd){
924
974
maxfd = new_plugin->fd;
978
TEMP_FAILURE_RETRY(closedir(dir));
980
free_plugin(getplugin(NULL));
931
982
for(plugin *p = plugin_list; p != NULL; p = p->next){
943
994
while(plugin_list){
944
995
fd_set rfds = rfds_all;
945
996
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
946
if (select_ret == -1){
997
if(select_ret == -1 and errno != EINTR){
947
998
perror("select");
948
999
exitstatus = EXIT_FAILURE;
952
1003
from one of them */
953
1004
for(plugin *proc = plugin_list; proc != NULL;){
954
1005
/* Is this process completely done? */
955
if(proc->eof and proc->completed){
1006
if(proc->completed and proc->eof){
956
1007
/* Only accept the plugin output if it exited cleanly */
957
1008
if(not WIFEXITED(proc->status)
958
1009
or WEXITSTATUS(proc->status) != 0){
959
1010
/* Bad exit by plugin */
962
1013
if(WIFEXITED(proc->status)){
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1014
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1015
" status %d\n", proc->name,
1016
(intmax_t) (proc->pid),
965
1017
WEXITSTATUS(proc->status));
966
} else if(WIFSIGNALED(proc->status)) {
967
fprintf(stderr, "Plugin %u killed by signal %d\n",
968
(unsigned int) (proc->pid),
969
WTERMSIG(proc->status));
1018
} else if(WIFSIGNALED(proc->status)){
1019
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1020
" signal %d: %s\n", proc->name,
1021
(intmax_t) (proc->pid),
1022
WTERMSIG(proc->status),
1023
strsignal(WTERMSIG(proc->status)));
970
1024
} else if(WCOREDUMP(proc->status)){
971
fprintf(stderr, "Plugin %d dumped core\n",
972
(unsigned int) (proc->pid));
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
976
1030
/* Remove the plugin */
977
1031
FD_CLR(proc->fd, &rfds_all);
979
1033
/* Block signal while modifying process_list */
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1036
&sigchld_action.sa_mask,
982
1039
perror("sigprocmask");
983
1040
exitstatus = EXIT_FAILURE;
989
1046
proc = next_plugin;
991
1048
/* We are done modifying process list, so unblock signal */
992
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1049
ret = (int)(TEMP_FAILURE_RETRY
1050
(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL)));
995
1053
perror("sigprocmask");
996
1054
exitstatus = EXIT_FAILURE;
1025
1083
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1026
1084
proc->buffer = realloc(proc->buffer, proc->buffer_size
1027
1085
+ (size_t) BUFFER_SIZE);
1028
if (proc->buffer == NULL){
1086
if(proc->buffer == NULL){
1029
1087
perror("malloc");
1030
1088
exitstatus = EXIT_FAILURE;
1033
1091
proc->buffer_size += BUFFER_SIZE;
1035
1093
/* Read from the process */
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1094
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1096
+ proc->buffer_length,
1039
1099
/* Read error from this process; ignore the error */
1040
1100
proc = proc->next;