38
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#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
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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,
56
#include <string.h> /* strsep, strlen(), asprintf(),
55
#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,
67
SIG_UNBLOCK, kill(), sig_atomic_t
65
SIG_UNBLOCK, kill() */
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#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
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68
#define BUFFER_SIZE 256
103
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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 */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
108
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){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
112
108
/* Create a new plugin */
113
plugin *new_plugin = NULL;
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
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113
char *copy_name = NULL;
121
114
if(name != NULL){
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
125
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if(copy_name == NULL){
131
*new_plugin = (plugin){ .name = copy_name,
134
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
124
.next = plugin_list };
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
139
if(new_plugin->argv == NULL){
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
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129
free(new_plugin);
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132
new_plugin->argv[0] = copy_name;
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133
new_plugin->argv[1] = NULL;
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
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if(new_plugin->environ == NULL){
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138
free(new_plugin->argv);
164
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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 */
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
153
*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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/* Make a copy of the new string */
179
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
180
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if(copy == NULL){
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if(strncmp(*e, def, namelen + 1) == 0){
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/* It already exists */
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
192
char *new = realloc(*e, strlen(def) + 1);
228
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
229
207
* Descriptor Flags".
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
232
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static int set_cloexec_flag(int fd){
233
int ret = TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
234
212
/* If reading the flags failed, return error indication now. */
238
216
/* Store modified flag word in the descriptor. */
239
return TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD, ret | FD_CLOEXEC));
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
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221
/* Mark processes as completed when they exit, and save their exit
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static void handle_sigchld(__attribute__((unused)) int sig){
246
int old_errno = errno;
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plugin *proc = plugin_list;
399
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
struct argp_state *state){
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
404
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case 'g': /* --global-options */
407
while((plugin_option = strsep(&arg, ",")) != NULL){
408
if(plugin_option[0] == '\0'){
381
while((p = strsep(&arg, ",")) != NULL){
411
if(not add_argument(getplugin(NULL), plugin_option)){
385
if(not add_argument(getplugin(NULL), p)){
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386
perror("add_argument");
413
387
return ARGP_ERR_UNKNOWN;
426
400
case 'o': /* --options-for */
428
char *plugin_name = strsep(&arg, ":");
429
if(plugin_name[0] == '\0'){
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(plugin_name), plugin_option)){
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)){
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416
perror("add_argument");
436
417
return ARGP_ERR_UNKNOWN;
476
457
plugindir = strdup(arg);
477
458
if(plugindir == NULL){
478
459
perror("strdup");
481
462
case 129: /* --config-file */
482
463
/* This is already done by parse_opt_config_file() */
484
465
case 130: /* --userid */
486
tmpmax = strtoimax(arg, &tmp, 10);
487
if(errno != 0 or tmp == arg or *tmp != '\0'
488
or tmpmax != (uid_t)tmpmax){
489
fprintf(stderr, "Bad user ID number: \"%s\", using %"
490
PRIdMAX "\n", arg, (intmax_t)uid);
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",
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473
case 131: /* --groupid */
497
tmpmax = strtoimax(arg, &tmp, 10);
498
if(errno != 0 or tmp == arg or *tmp != '\0'
499
or tmpmax != (gid_t)tmpmax){
500
fprintf(stderr, "Bad group ID number: \"%s\", using %"
501
PRIdMAX "\n", arg, (intmax_t)gid);
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",
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481
case 132: /* --debug */
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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. */
531
error_t parse_opt_config_file(int key, char *arg,
532
__attribute__((unused))
533
struct argp_state *state){
506
error_t parse_opt_config_file (int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
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510
case 'g': /* --global-options */
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case 'G': /* --global-env */
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512
case 'o': /* --options-for */
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.doc = "Mandos plugin runner -- Run plugins" };
567
/* Parse using parse_opt_config_file() in order to get the custom
542
/* Parse using the parse_opt_config_file in order to get the custom
568
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config file location, if any. */
569
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
570
if(ret == ARGP_ERR_UNKNOWN){
544
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if (ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unknown error while parsing arguments\n");
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exitstatus = EXIT_FAILURE;
577
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argp.parser = parse_opt;
579
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/* Open the configfile if available */
555
if (argfile == NULL){
581
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conffp = fopen(AFILE, "r");
583
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conffp = fopen(argfile, "r");
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if(conffp != NULL){
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char *org_line = NULL;
587
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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[] = "#";
593
568
custom_argv = malloc(sizeof(char*) * 2);
594
569
if(custom_argv == NULL){
633
608
custom_argv[custom_argc-1] = new_arg;
634
custom_argv[custom_argc] = NULL;
609
custom_argv[custom_argc] = NULL;
638
ret = fclose(conffp);
639
} while(ret == EOF and errno == EINTR);
642
exitstatus = EXIT_FAILURE;
647
614
/* Check for harmful errors and go to fallback. Other errors might
648
615
not affect opening plugins */
649
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
616
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
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exitstatus = EXIT_FAILURE;
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/* If there was any arguments from configuration file,
656
623
pass them to parser as command arguments */
657
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if(custom_argv != NULL){
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
if(ret == ARGP_ERR_UNKNOWN){
625
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
627
if (ret == ARGP_ERR_UNKNOWN){
661
628
fprintf(stderr, "Unknown error while parsing arguments\n");
662
629
exitstatus = EXIT_FAILURE;
667
634
/* Parse actual command line arguments, to let them override the
669
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
670
if(ret == ARGP_ERR_UNKNOWN){
636
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if (ret == ARGP_ERR_UNKNOWN){
671
638
fprintf(stderr, "Unknown error while parsing arguments\n");
672
639
exitstatus = EXIT_FAILURE;
680
647
for(char **a = p->argv; *a != NULL; a++){
681
648
fprintf(stderr, "\tArg: %s\n", *a);
683
fprintf(stderr, "...and %d environment variables\n", p->envc);
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
684
651
for(char **a = p->environ; *a != NULL; a++){
685
652
fprintf(stderr, "\t%s\n", *a);
790
755
if(plugindir == NULL){
791
ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
798
761
perror("asprintf");
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
765
ret = stat(filename, &st);
809
772
/* Ignore non-executable files */
810
if(not S_ISREG(st.st_mode)
811
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
773
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
813
775
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
814
776
" with bad type or mode\n", filename);
882
844
/* Block SIGCHLD until process is safely in process list */
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
845
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
887
847
perror("sigprocmask");
888
848
exitstatus = EXIT_FAILURE;
891
851
/* Starting a new process to be watched */
895
} while(pid == -1 and errno == EINTR);
898
855
exitstatus = EXIT_FAILURE;
938
895
/* Parent process */
939
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
896
close(pipefd[1]); /* Close unused write end of pipe */
942
898
plugin *new_plugin = getplugin(dirst->d_name);
943
if(new_plugin == NULL){
899
if (new_plugin == NULL){
944
900
perror("getplugin");
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
949
903
perror("sigprocmask");
958
912
/* Unblock SIGCHLD so signal handler can be run if this process
959
913
has already completed */
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
914
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
964
916
perror("sigprocmask");
965
917
exitstatus = EXIT_FAILURE;
969
921
FD_SET(new_plugin->fd, &rfds_all);
971
if(maxfd < new_plugin->fd){
923
if (maxfd < new_plugin->fd){
972
924
maxfd = new_plugin->fd;
976
TEMP_FAILURE_RETRY(closedir(dir));
978
free_plugin(getplugin(NULL));
980
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
992
943
while(plugin_list){
993
944
fd_set rfds = rfds_all;
994
945
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
995
if(select_ret == -1 and errno != EINTR){
946
if (select_ret == -1){
996
947
perror("select");
997
948
exitstatus = EXIT_FAILURE;
1001
952
from one of them */
1002
953
for(plugin *proc = plugin_list; proc != NULL;){
1003
954
/* Is this process completely done? */
1004
if(proc->completed and proc->eof){
955
if(proc->eof and proc->completed){
1005
956
/* Only accept the plugin output if it exited cleanly */
1006
957
if(not WIFEXITED(proc->status)
1007
958
or WEXITSTATUS(proc->status) != 0){
1008
959
/* Bad exit by plugin */
1011
962
if(WIFEXITED(proc->status)){
1012
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1013
" status %d\n", proc->name,
1014
(intmax_t) (proc->pid),
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1015
965
WEXITSTATUS(proc->status));
1016
} else if(WIFSIGNALED(proc->status)){
1017
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1018
" signal %d: %s\n", proc->name,
1019
(intmax_t) (proc->pid),
1020
WTERMSIG(proc->status),
1021
strsignal(WTERMSIG(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));
1022
970
} else if(WCOREDUMP(proc->status)){
1023
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1024
" core\n", proc->name, (intmax_t) (proc->pid));
971
fprintf(stderr, "Plugin %d dumped core\n",
972
(unsigned int) (proc->pid));
1028
976
/* Remove the plugin */
1029
977
FD_CLR(proc->fd, &rfds_all);
1031
979
/* Block signal while modifying process_list */
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1036
982
perror("sigprocmask");
1037
983
exitstatus = EXIT_FAILURE;
1043
989
proc = next_plugin;
1045
991
/* We are done modifying process list, so unblock signal */
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
992
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1050
995
perror("sigprocmask");
1051
996
exitstatus = EXIT_FAILURE;
1080
1025
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1081
1026
proc->buffer = realloc(proc->buffer, proc->buffer_size
1082
1027
+ (size_t) BUFFER_SIZE);
1083
if(proc->buffer == NULL){
1028
if (proc->buffer == NULL){
1084
1029
perror("malloc");
1085
1030
exitstatus = EXIT_FAILURE;
1088
1033
proc->buffer_size += BUFFER_SIZE;
1090
1035
/* Read from the process */
1091
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1093
+ proc->buffer_length,
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1096
1039
/* Read error from this process; ignore the error */
1097
1040
proc = proc->next;