38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
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44
#include <iso646.h> /* and, or, not */
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45
#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() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
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58
#include <errno.h> /* errno */
57
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#include <argp.h> /* struct argp_option, struct
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argp_state, struct argp,
62
64
#include <signal.h> /* struct sigaction, sigemptyset(),
63
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sigaddset(), sigaction(),
64
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sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
66
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
68
72
#define BUFFER_SIZE 256
99
103
or if none is found, creates a new one */
100
104
static plugin *getplugin(char *name){
101
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/* Check for exiting plugin with that name */
102
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))){
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
108
or (p->name and name and (strcmp(p->name, name) == 0))){
108
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){
129
141
free(new_plugin);
132
144
new_plugin->argv[0] = copy_name;
133
145
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);
136
150
if(new_plugin->environ == NULL){
138
152
free(new_plugin->argv);
150
164
static bool add_to_char_array(const char *new, char ***array,
152
166
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
}while(*array == NULL and errno == EINTR);
155
171
/* Malloc check */
156
172
if(*array == NULL){
159
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/* Make a copy of the new string */
160
char *copy = strdup(new);
179
}while(copy == NULL and errno == EINTR);
161
180
if(copy == NULL){
189
208
if(strncmp(*e, def, namelen + 1) == 0){
190
209
/* 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);
206
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
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 = TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
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234
/* If reading the flags failed, return error indication now. */
216
238
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
239
return TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD, ret | FD_CLOEXEC));
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/* Mark processes as completed when they exit, and save their exit
223
245
static void handle_sigchld(__attribute__((unused)) int sig){
246
int old_errno = errno;
225
248
plugin *proc = plugin_list;
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
399
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
struct argp_state *state){
377
404
case 'g': /* --global-options */
380
while((p = strsep(&arg, ",")) != NULL){
407
while((plugin_option = strsep(&arg, ",")) != NULL){
408
if(plugin_option[0] == '\0'){
384
if(not add_argument(getplugin(NULL), p)){
411
if(not add_argument(getplugin(NULL), plugin_option)){
385
412
perror("add_argument");
386
413
return ARGP_ERR_UNKNOWN;
399
426
case 'o': /* --options-for */
401
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
405
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
410
while((p = strsep(&opt, ",")) != NULL){
414
if(not add_argument(getplugin(p_name), p)){
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)){
415
435
perror("add_argument");
416
436
return ARGP_ERR_UNKNOWN;
456
476
plugindir = strdup(arg);
457
477
if(plugindir == NULL){
458
478
perror("strdup");
461
481
case 129: /* --config-file */
462
482
/* This is already done by parse_opt_config_file() */
464
484
case 130: /* --userid */
465
uid = (uid_t)strtol(arg, NULL, 10);
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);
467
495
case 131: /* --groupid */
468
gid = (gid_t)strtol(arg, NULL, 10);
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);
470
506
case 132: /* --debug */
510
* When adding more options before this line, remember to also add a
511
* "case" to the "parse_opt_config_file" function below.
473
513
case ARGP_KEY_ARG:
474
514
/* Cryptsetup always passes an argument, which is an empty
475
515
string if "none" was specified in /etc/crypttab. So if
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529
/* This option parser is the same as parse_opt() above, except it
490
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ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
531
error_t parse_opt_config_file(int key, char *arg,
532
__attribute__((unused))
533
struct argp_state *state){
495
535
case 'g': /* --global-options */
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536
case 'G': /* --global-env */
497
537
case 'o': /* --options-for */
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.doc = "Mandos plugin runner -- Run plugins" };
527
/* Parse using the parse_opt_config_file in order to get the custom
567
/* Parse using parse_opt_config_file() in order to get the custom
528
568
config file location, if any. */
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
530
if (ret == ARGP_ERR_UNKNOWN){
569
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
570
if(ret == ARGP_ERR_UNKNOWN){
531
571
fprintf(stderr, "Unknown error while parsing arguments\n");
532
572
exitstatus = EXIT_FAILURE;
537
577
argp.parser = parse_opt;
539
579
/* Open the configfile if available */
540
if (argfile == NULL){
541
581
conffp = fopen(AFILE, "r");
543
583
conffp = fopen(argfile, "r");
545
585
if(conffp != NULL){
546
586
char *org_line = NULL;
547
587
char *p, *arg, *new_arg, *line;
550
589
const char whitespace_delims[] = " \r\t\f\v\n";
551
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const char comment_delim[] = "#";
554
593
custom_argv = malloc(sizeof(char*) * 2);
555
594
if(custom_argv == NULL){
594
633
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
634
custom_argv[custom_argc] = NULL;
638
ret = fclose(conffp);
639
}while(ret == EOF and errno == EINTR);
642
exitstatus = EXIT_FAILURE;
600
647
/* Check for harmful errors and go to fallback. Other errors might
601
648
not affect opening plugins */
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
649
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
604
651
exitstatus = EXIT_FAILURE;
608
655
/* If there was any arguments from configuration file,
609
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pass them to parser as command arguments */
610
657
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
613
if (ret == ARGP_ERR_UNKNOWN){
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
if(ret == ARGP_ERR_UNKNOWN){
614
661
fprintf(stderr, "Unknown error while parsing arguments\n");
615
662
exitstatus = EXIT_FAILURE;
620
667
/* Parse actual command line arguments, to let them override the
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
669
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
670
if(ret == ARGP_ERR_UNKNOWN){
624
671
fprintf(stderr, "Unknown error while parsing arguments\n");
625
672
exitstatus = EXIT_FAILURE;
633
680
for(char **a = p->argv; *a != NULL; a++){
634
681
fprintf(stderr, "\tArg: %s\n", *a);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
683
fprintf(stderr, "...and %d environment variables\n", p->envc);
637
684
for(char **a = p->environ; *a != NULL; a++){
638
685
fprintf(stderr, "\t%s\n", *a);
741
790
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
791
ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
747
798
perror("asprintf");
751
ret = stat(filename, &st);
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
758
809
/* Ignore non-executable files */
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
810
if(not S_ISREG(st.st_mode)
811
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
761
813
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
814
" with bad type or mode\n", filename);
830
882
/* Block SIGCHLD until process is safely in process list */
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
833
887
perror("sigprocmask");
834
888
exitstatus = EXIT_FAILURE;
837
891
/* Starting a new process to be watched */
895
}while(pid == -1 and errno == EINTR);
841
898
exitstatus = EXIT_FAILURE;
881
938
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
939
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
884
942
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
943
if(new_plugin == NULL){
886
944
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
889
949
perror("sigprocmask");
898
958
/* Unblock SIGCHLD so signal handler can be run if this process
899
959
has already completed */
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
902
964
perror("sigprocmask");
903
965
exitstatus = EXIT_FAILURE;
907
969
FD_SET(new_plugin->fd, &rfds_all);
909
if (maxfd < new_plugin->fd){
971
if(maxfd < new_plugin->fd){
910
972
maxfd = new_plugin->fd;
976
TEMP_FAILURE_RETRY(closedir(dir));
978
free_plugin(getplugin(NULL));
917
980
for(plugin *p = plugin_list; p != NULL; p = p->next){
929
992
while(plugin_list){
930
993
fd_set rfds = rfds_all;
931
994
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
if (select_ret == -1){
995
if(select_ret == -1 and errno != EINTR){
933
996
perror("select");
934
997
exitstatus = EXIT_FAILURE;
938
1001
from one of them */
939
1002
for(plugin *proc = plugin_list; proc != NULL;){
940
1003
/* Is this process completely done? */
941
if(proc->eof and proc->completed){
1004
if(proc->completed and proc->eof){
942
1005
/* Only accept the plugin output if it exited cleanly */
943
1006
if(not WIFEXITED(proc->status)
944
1007
or WEXITSTATUS(proc->status) != 0){
945
1008
/* Bad exit by plugin */
948
1011
if(WIFEXITED(proc->status)){
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1012
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1013
" status %d\n", proc->name,
1014
(intmax_t) (proc->pid),
951
1015
WEXITSTATUS(proc->status));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(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)));
956
1022
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1023
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1024
" core\n", proc->name, (intmax_t) (proc->pid));
962
1028
/* Remove the plugin */
963
1029
FD_CLR(proc->fd, &rfds_all);
965
1031
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
968
1036
perror("sigprocmask");
969
1037
exitstatus = EXIT_FAILURE;
975
1043
proc = next_plugin;
977
1045
/* We are done modifying process list, so unblock signal */
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
981
1050
perror("sigprocmask");
982
1051
exitstatus = EXIT_FAILURE;
1011
1080
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1012
1081
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
1082
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1083
if(proc->buffer == NULL){
1015
1084
perror("malloc");
1016
1085
exitstatus = EXIT_FAILURE;
1019
1088
proc->buffer_size += BUFFER_SIZE;
1021
1090
/* Read from the process */
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1091
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1093
+ proc->buffer_length,
1025
1096
/* Read error from this process; ignore the error */
1026
1097
proc = proc->next;
1031
1102
proc->eof = true;
1033
proc->buffer_length += (size_t) ret;
1104
proc->buffer_length += (size_t) sret;
1041
1112
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){