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(),
43
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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(),
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#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#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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64
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 */
104
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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))){
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))){
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){
120
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
116
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){
141
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 *));
150
136
if(new_plugin->environ == NULL){
152
138
free(new_plugin->argv);
164
150
static bool add_to_char_array(const char *new, char ***array,
166
152
/* 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 *)
154
* (size_t) ((*len) + 2));
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/* Malloc check */
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if(*array == NULL){
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159
/* Make a copy of the new string */
179
}while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
180
161
if(copy == NULL){
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189
if(strncmp(*e, def, namelen + 1) == 0){
209
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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
210
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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/* 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;
248
225
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)){
412
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)){
435
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
uid = (uid_t)strtol(arg, NULL, 10);
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468
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);
469
gid = (gid_t)strtol(arg, NULL, 10);
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471
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.
513
474
case ARGP_KEY_ARG:
514
475
/* Cryptsetup always passes an argument, which is an empty
515
476
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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491
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){
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
535
496
case 'g': /* --global-options */
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497
case 'G': /* --global-env */
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498
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
528
/* Parse using the parse_opt_config_file in order to get the custom
568
529
config file location, if any. */
569
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
570
if(ret == ARGP_ERR_UNKNOWN){
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
531
if (ret == ARGP_ERR_UNKNOWN){
571
532
fprintf(stderr, "Unknown error while parsing arguments\n");
572
533
exitstatus = EXIT_FAILURE;
577
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argp.parser = parse_opt;
579
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/* Open the configfile if available */
541
if (argfile == NULL){
581
542
conffp = fopen(AFILE, "r");
583
544
conffp = fopen(argfile, "r");
585
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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
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custom_argv = malloc(sizeof(char*) * 2);
594
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if(custom_argv == NULL){
633
594
custom_argv[custom_argc-1] = new_arg;
634
custom_argv[custom_argc] = NULL;
595
custom_argv[custom_argc] = NULL;
638
ret = fclose(conffp);
639
}while(ret == EOF and errno == EINTR);
642
exitstatus = EXIT_FAILURE;
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600
/* Check for harmful errors and go to fallback. Other errors might
648
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not affect opening plugins */
649
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
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
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pass them to parser as command arguments */
657
610
if(custom_argv != NULL){
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
if(ret == ARGP_ERR_UNKNOWN){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
613
if (ret == ARGP_ERR_UNKNOWN){
661
614
fprintf(stderr, "Unknown error while parsing arguments\n");
662
615
exitstatus = EXIT_FAILURE;
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/* 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){
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
671
624
fprintf(stderr, "Unknown error while parsing arguments\n");
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625
exitstatus = EXIT_FAILURE;
680
633
for(char **a = p->argv; *a != NULL; a++){
681
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fprintf(stderr, "\tArg: %s\n", *a);
683
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
684
637
for(char **a = p->environ; *a != NULL; a++){
685
638
fprintf(stderr, "\t%s\n", *a);
790
741
if(plugindir == NULL){
791
ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
798
747
perror("asprintf");
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
751
ret = stat(filename, &st);
809
758
/* Ignore non-executable files */
810
if(not S_ISREG(st.st_mode)
811
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
813
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
814
762
" with bad type or mode\n", filename);
882
830
/* Block SIGCHLD until process is safely in process list */
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
887
833
perror("sigprocmask");
888
834
exitstatus = EXIT_FAILURE;
891
837
/* Starting a new process to be watched */
895
}while(pid == -1 and errno == EINTR);
898
841
exitstatus = EXIT_FAILURE;
938
881
/* Parent process */
939
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
882
close(pipefd[1]); /* Close unused write end of pipe */
942
884
plugin *new_plugin = getplugin(dirst->d_name);
943
if(new_plugin == NULL){
885
if (new_plugin == NULL){
944
886
perror("getplugin");
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
949
889
perror("sigprocmask");
958
898
/* Unblock SIGCHLD so signal handler can be run if this process
959
899
has already completed */
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
964
902
perror("sigprocmask");
965
903
exitstatus = EXIT_FAILURE;
969
907
FD_SET(new_plugin->fd, &rfds_all);
971
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
972
910
maxfd = new_plugin->fd;
976
TEMP_FAILURE_RETRY(closedir(dir));
978
free_plugin(getplugin(NULL));
980
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
992
929
while(plugin_list){
993
930
fd_set rfds = rfds_all;
994
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
995
if(select_ret == -1 and errno != EINTR){
932
if (select_ret == -1){
996
933
perror("select");
997
934
exitstatus = EXIT_FAILURE;
1001
938
from one of them */
1002
939
for(plugin *proc = plugin_list; proc != NULL;){
1003
940
/* Is this process completely done? */
1004
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
1005
942
/* Only accept the plugin output if it exited cleanly */
1006
943
if(not WIFEXITED(proc->status)
1007
944
or WEXITSTATUS(proc->status) != 0){
1008
945
/* Bad exit by plugin */
1011
948
if(WIFEXITED(proc->status)){
1012
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1013
" status %d\n", proc->name,
1014
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1015
951
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)));
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));
1022
956
} else if(WCOREDUMP(proc->status)){
1023
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1024
" core\n", proc->name, (intmax_t) (proc->pid));
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1028
962
/* Remove the plugin */
1029
963
FD_CLR(proc->fd, &rfds_all);
1031
965
/* Block signal while modifying process_list */
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1036
968
perror("sigprocmask");
1037
969
exitstatus = EXIT_FAILURE;
1043
975
proc = next_plugin;
1045
977
/* We are done modifying process list, so unblock signal */
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1050
981
perror("sigprocmask");
1051
982
exitstatus = EXIT_FAILURE;
1080
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1081
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1082
1013
+ (size_t) BUFFER_SIZE);
1083
if(proc->buffer == NULL){
1014
if (proc->buffer == NULL){
1084
1015
perror("malloc");
1085
1016
exitstatus = EXIT_FAILURE;
1088
1019
proc->buffer_size += BUFFER_SIZE;
1090
1021
/* Read from the process */
1091
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1093
+ proc->buffer_length,
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1096
1025
/* Read error from this process; ignore the error */
1097
1026
proc = proc->next;