1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
3
* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
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* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
13
* This program is distributed in the hope that it will be useful, but
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* General Public License for more details.
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* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@recompile.se>.
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
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stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
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readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
58
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
#include <fnmatch.h> /* fnmatch() */
77
#define BUFFER_SIZE 256
79
#define PDIR "/lib/mandos/plugins.d"
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
85
typedef struct plugin{
86
char *name; /* can be NULL or any plugin name */
93
/* Variables used for running processes*/
1
#include <stdio.h> /* popen, fileno */
2
#include <iso646.h> /* and, or, not */
3
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
4
WIFEXITED, WEXITSTATUS, wait */
5
#include <sys/wait.h> /* wait */
6
#include <dirent.h> /* DIR, opendir */
7
#include <sys/stat.h> /* stat, struct stat */
8
#include <unistd.h> /* stat, struct stat, chdir */
9
#include <stdlib.h> /* EXIT_FAILURE */
10
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET, FD_ISSET */
11
#include <string.h> /* strlen, strcpy, strcat */
12
#include <stdbool.h> /* true */
13
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
14
#include <errno.h> /* errno */
18
typedef struct process{
100
volatile sig_atomic_t completed;
105
static plugin *plugin_list = NULL;
107
/* Gets an existing plugin based on name,
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
114
or (p->name and name and (strcmp(p->name, name) == 0))){
118
/* Create a new plugin */
119
plugin *new_plugin = NULL;
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
126
char *copy_name = NULL;
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
131
if(copy_name == NULL){
139
*new_plugin = (plugin){ .name = copy_name,
142
.next = plugin_list };
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
154
new_plugin->argv[0] = copy_name;
155
new_plugin->argv[1] = NULL;
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
160
if(new_plugin->environ == NULL){
163
free(new_plugin->argv);
168
new_plugin->environ[0] = NULL;
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/* Append the new plugin to the list */
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plugin_list = new_plugin;
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
static bool add_to_char_array(const char *new, char ***array,
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
186
if(new_array == NULL){
190
/* Make a copy of the new string */
194
} while(copy == NULL and errno == EINTR);
198
/* Insert the copy */
199
(*array)[*len] = copy;
201
/* Add a new terminating NULL pointer to the last element */
202
(*array)[*len] = NULL;
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
static bool add_argument(plugin *p, const char *arg){
212
return add_to_char_array(arg, &(p->argv), &(p->argc));
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
221
/* namelen = length of name of environment variable */
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
226
/* It already exists */
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
241
return add_to_char_array(def, &(p->environ), &(p->envc));
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
252
/* If reading the flags failed, return error indication now. */
256
/* Store modified flag word in the descriptor. */
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
262
/* Mark processes as completed when they exit, and save their exit
264
static void handle_sigchld(__attribute__((unused)) int sig){
265
int old_errno = errno;
267
plugin *proc = plugin_list;
269
pid_t pid = waitpid(-1, &status, WNOHANG);
271
/* Only still running child processes */
276
/* No child processes */
279
error(0, errno, "waitpid");
282
/* A child exited, find it in process_list */
283
while(proc != NULL and proc->pid != pid){
287
/* Process not found in process list */
290
proc->status = status;
296
/* Prints out a password to stdout */
297
__attribute__((nonnull, warn_unused_result))
298
static bool print_out_password(const char *buffer, size_t length){
300
for(size_t written = 0; written < length; written += (size_t)ret){
301
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
310
/* Removes and free a plugin from the plugin list */
311
__attribute__((nonnull))
312
static void free_plugin(plugin *plugin_node){
314
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
free(plugin_node->argv);
318
for(char **env = plugin_node->environ; *env != NULL; env++){
321
free(plugin_node->environ);
322
free(plugin_node->buffer);
324
/* Removes the plugin from the singly-linked list */
325
if(plugin_node == plugin_list){
326
/* First one - simple */
327
plugin_list = plugin_list->next;
329
/* Second one or later */
330
for(plugin *p = plugin_list; p != NULL; p = p->next){
331
if(p->next == plugin_node){
332
p->next = plugin_node->next;
341
static void free_plugin_list(void){
342
while(plugin_list != NULL){
343
free_plugin(plugin_list);
27
#define BUFFER_SIZE 256
347
29
int main(int argc, char *argv[]){
348
char *plugindir = NULL;
349
char *argfile = NULL;
30
char plugindir[] = "plugins.d";
31
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
352
33
struct dirent *dirst;
355
36
int ret, maxfd = 0;
360
int exitstatus = EXIT_SUCCESS;
361
struct sigaction old_sigchld_action;
362
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
363
.sa_flags = SA_NOCLDSTOP };
364
char **custom_argv = NULL;
368
/* Establish a signal handler */
369
sigemptyset(&sigchld_action.sa_mask);
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
383
/* The options we understand. */
384
struct argp_option options[] = {
385
{ .name = "global-options", .key = 'g',
386
.arg = "OPTION[,OPTION[,...]]",
387
.doc = "Options passed to all plugins" },
388
{ .name = "global-env", .key = 'G',
390
.doc = "Environment variable passed to all plugins" },
391
{ .name = "options-for", .key = 'o',
392
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
393
.doc = "Options passed only to specified plugin" },
394
{ .name = "env-for", .key = 'E',
395
.arg = "PLUGIN:ENV=value",
396
.doc = "Environment variable passed to specified plugin" },
397
{ .name = "disable", .key = 'd',
399
.doc = "Disable a specific plugin", .group = 1 },
400
{ .name = "enable", .key = 'e',
402
.doc = "Enable a specific plugin", .group = 1 },
403
{ .name = "plugin-dir", .key = 128,
405
.doc = "Specify a different plugin directory", .group = 2 },
406
{ .name = "config-file", .key = 129,
408
.doc = "Specify a different configuration file", .group = 2 },
409
{ .name = "userid", .key = 130,
410
.arg = "ID", .flags = 0,
411
.doc = "User ID the plugins will run as", .group = 3 },
412
{ .name = "groupid", .key = 131,
413
.arg = "ID", .flags = 0,
414
.doc = "Group ID the plugins will run as", .group = 3 },
415
{ .name = "debug", .key = 132,
416
.doc = "Debug mode", .group = 4 },
418
* These reproduce what we would get without ARGP_NO_HELP
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
435
case 'g': /* --global-options */
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
446
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
451
case 'o': /* --options-for */
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
462
argp_error(state, "Empty plugin name");
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
475
case 'E': /* --env-for */
477
char *envdef = strchr(arg, ':');
479
argp_error(state, "No colon in \"%s\"", arg);
486
argp_error(state, "Empty plugin name");
490
if(add_environment(getplugin(arg), envdef, true)){
495
case 'd': /* --disable */
497
plugin *p = getplugin(arg);
504
case 'e': /* --enable */
506
plugin *p = getplugin(arg);
513
case 128: /* --plugin-dir */
515
plugindir = strdup(arg);
516
if(plugindir != NULL){
520
case 129: /* --config-file */
521
/* This is already done by parse_opt_config_file() */
523
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
534
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
545
case 132: /* --debug */
549
* These reproduce what we would get without ARGP_NO_HELP
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
574
return ARGP_ERR_UNKNOWN;
576
return errno; /* Set to 0 at start */
579
/* This option parser is the same as parse_opt() above, except it
580
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
586
case 'g': /* --global-options */
587
case 'G': /* --global-env */
588
case 'o': /* --options-for */
589
case 'E': /* --env-for */
590
case 'd': /* --disable */
591
case 'e': /* --enable */
592
case 128: /* --plugin-dir */
594
case 129: /* --config-file */
596
argfile = strdup(arg);
601
case 130: /* --userid */
602
case 131: /* --groupid */
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
610
return ARGP_ERR_UNKNOWN;
615
struct argp argp = { .options = options,
616
.parser = parse_opt_config_file,
618
.doc = "Mandos plugin runner -- Run plugins" };
620
/* Parse using parse_opt_config_file() in order to get the custom
621
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
635
exitstatus = EX_USAGE;
639
/* Reset to the normal argument parser */
640
argp.parser = parse_opt;
642
/* Open the configfile if available */
644
conffp = fopen(AFILE, "r");
646
conffp = fopen(argfile, "r");
649
char *org_line = NULL;
650
char *p, *arg, *new_arg, *line;
652
const char whitespace_delims[] = " \r\t\f\v\n";
653
const char comment_delim[] = "#";
656
custom_argv = malloc(sizeof(char*) * 2);
657
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
662
custom_argv[0] = argv[0];
663
custom_argv[1] = NULL;
665
/* for each line in the config file, strip whitespace and ignore
668
sret = getline(&org_line, &size, conffp);
674
arg = strsep(&line, comment_delim);
675
while((p = strsep(&arg, whitespace_delims)) != NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
689
char **new_argv = realloc(custom_argv, sizeof(char *)
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
699
custom_argv = new_argv;
702
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
716
/* Check for harmful errors and go to fallback. Other errors might
717
not affect opening plugins */
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
726
if(custom_argv != NULL){
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
740
exitstatus = EX_CONFIG;
745
/* Parse actual command line arguments, to let them override the
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
760
exitstatus = EX_USAGE;
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
766
fprintf(stderr, "Plugin: %s has %d arguments\n",
767
p->name ? p->name : "Global", p->argc - 1);
768
for(char **a = p->argv; *a != NULL; a++){
769
fprintf(stderr, "\tArg: %s\n", *a);
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
772
for(char **a = p->environ; *a != NULL; a++){
773
fprintf(stderr, "\t%s\n", *a);
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
784
error(0, errno, "open(\"" PDIR "\")");
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
789
error(0, errno, "fstat");
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
794
error(0, errno, "fchown");
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
802
/* Lower permissions */
805
error(0, errno, "setgid");
809
error(0, errno, "setuid");
812
/* Open plugin directory with close_on_exec flag */
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
817
#else /* not O_CLOEXEC */
819
#endif /* not O_CLOEXEC */
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
831
error(0, errno, "set_cloexec_flag");
832
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
836
#endif /* O_CLOEXEC */
838
dir = fdopendir(dir_fd);
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
849
/* Read and execute any executable in the plugin directory*/
37
process *process_list = NULL;
39
dir = opendir(plugindir);
42
fprintf(stderr, "Can not open directory\n");
852
dirst = readdir(dir);
853
} while(dirst == NULL and errno == EINTR);
855
/* All directory entries have been processed */
51
// All directory entries have been processed
856
52
if(dirst == NULL){
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
865
/* Ignore dotfiles, backup files and other junk */
867
bool bad_name = false;
868
const char * const patterns[] = { ".*", "#*#", "*~",
869
"*.dpkg-new", "*.dpkg-old",
870
"*.dpkg-bak", "*.dpkg-divert",
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
879
#pragma GCC diagnostic pop
881
if(fnmatch(*pat, dirst->d_name,
882
FNM_FILE_NAME | FNM_PERIOD) != FNM_NOMATCH){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirst->d_name, *pat);
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
899
#else /* not O_CLOEXEC */
901
#endif /* not O_CLOEXEC */
904
error(0, errno, "Could not open plugin");
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
918
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
923
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
932
TEMP_FAILURE_RETRY(close(plugin_fd));
936
plugin *p = getplugin(dirst->d_name);
938
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
944
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
947
TEMP_FAILURE_RETRY(close(plugin_fd));
951
/* Add global arguments to argument list for this plugin */
952
plugin *g = getplugin(NULL);
954
for(char **a = g->argv + 1; *a != NULL; a++){
955
if(not add_argument(p, *a)){
956
error(0, errno, "add_argument");
959
/* Add global environment variables */
960
for(char **e = g->environ; *e != NULL; e++){
961
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
969
if(p->environ[0] != NULL){
970
for(char **e = environ; *e != NULL; e++){
971
if(not add_environment(p, *e, false)){
972
error(0, errno, "add_environment");
978
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
980
error(0, errno, "pipe");
981
exitstatus = EX_OSERR;
984
/* Ask OS to automatic close the pipe on exec */
985
ret = set_cloexec_flag(pipefd[0]);
987
error(0, errno, "set_cloexec_flag");
988
exitstatus = EX_OSERR;
991
ret = set_cloexec_flag(pipefd[1]);
993
error(0, errno, "set_cloexec_flag");
994
exitstatus = EX_OSERR;
997
/* Block SIGCHLD until process is safely in process list */
998
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
999
&sigchld_action.sa_mask,
1002
error(0, errno, "sigprocmask");
1003
exitstatus = EX_OSERR;
1006
/* Starting a new process to be watched */
1010
} while(pid == -1 and errno == EINTR);
1012
error(0, errno, "fork");
1013
exitstatus = EX_OSERR;
1017
/* this is the child process */
1018
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1020
error(0, errno, "sigaction");
1023
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1025
error(0, errno, "sigprocmask");
1029
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1031
error(0, errno, "dup2");
1036
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1037
above and must now close it manually here. */
56
d_name_len = strlen(dirst->d_name);
58
// Ignore dotfiles and backup files
59
if (dirst->d_name[0] == '.'
60
or dirst->d_name[d_name_len - 1] == '~'){
64
char *filename = malloc(d_name_len + plugindir_len + 1);
65
strcpy(filename, plugindir);
66
strcat(filename, "/");
67
strcat(filename, dirst->d_name);
71
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
72
// Starting a new process to be watched
73
process *new_process = malloc(sizeof(process));
76
new_process->pid = fork();
77
if(new_process->pid == 0){
78
/* this is the child process */
1040
if(fexecve(plugin_fd, p->argv,
1041
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1042
error(0, errno, "fexecve for %s/%s",
1043
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1048
/* Parent process */
1049
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1051
TEMP_FAILURE_RETRY(close(plugin_fd));
1052
plugin *new_plugin = getplugin(dirst->d_name);
1053
if(new_plugin == NULL){
1054
error(0, errno, "getplugin");
1055
ret = (int)(TEMP_FAILURE_RETRY
1056
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1059
error(0, errno, "sigprocmask");
1061
exitstatus = EX_OSERR;
1065
new_plugin->pid = pid;
1066
new_plugin->fd = pipefd[0];
1068
/* Unblock SIGCHLD so signal handler can be run if this process
1069
has already completed */
1070
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1071
&sigchld_action.sa_mask,
1074
error(0, errno, "sigprocmask");
1075
exitstatus = EX_OSERR;
1079
#if defined (__GNUC__) and defined (__GLIBC__)
1080
#if not __GLIBC_PREREQ(2, 16)
1081
#pragma GCC diagnostic push
1082
#pragma GCC diagnostic ignored "-Wsign-conversion"
1085
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1086
-Wconversion in GNU libc
1088
#if defined (__GNUC__) and defined (__GLIBC__)
1089
#if not __GLIBC_PREREQ(2, 16)
1090
#pragma GCC diagnostic pop
1094
if(maxfd < new_plugin->fd){
1095
maxfd = new_plugin->fd;
1099
TEMP_FAILURE_RETRY(closedir(dir));
1101
free_plugin(getplugin(NULL));
1103
for(plugin *p = plugin_list; p != NULL; p = p->next){
80
close(pipefd[0]); /* close unused read end of pipe */
81
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
82
/* create a new modified argument list */
83
char **new_argv = malloc(sizeof(char *) * argc + 1);
84
new_argv[0] = filename;
85
for(int i = 1; i < argc; i++){
86
new_argv[i] = argv[i];
88
new_argv[argc] = NULL;
89
if(execv(filename, new_argv) < 0){
96
close(pipefd[1]); /* close unused write end of pipe */
97
new_process->fd = pipefd[0];
98
new_process->buffer = malloc(BUFFER_SIZE);
99
if (new_process->buffer == NULL){
103
new_process->buffer_size = BUFFER_SIZE;
104
new_process->buffer_length = 0;
105
FD_SET(new_process->fd, &rfds_orig);
107
if (maxfd < new_process->fd){
108
maxfd = new_process->fd;
112
new_process->next = process_list;
113
process_list = new_process;
119
if (process_list != NULL){
121
fd_set rfds = rfds_orig;
122
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
123
if (select_ret == -1){
127
for(process *process_itr = process_list; process_itr != NULL;
128
process_itr = process_itr->next){
129
if(FD_ISSET(process_itr->fd, &rfds)){
130
if(process_itr->buffer_length + BUFFER_SIZE
131
> process_itr->buffer_size){
132
process_itr->buffer = realloc(process_itr->buffer,
133
process_itr->buffer_size
135
if (process_itr->buffer == NULL){
139
process_itr->buffer_size += BUFFER_SIZE;
141
ret = read(process_itr->fd, process_itr->buffer
142
+ process_itr->buffer_length, BUFFER_SIZE);
143
process_itr->buffer_length+=ret;
146
/* wait for process exit */
148
waitpid(process_itr->pid, &status, 0);
149
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
150
write(STDOUT_FILENO, process_itr->buffer,
151
process_itr->buffer_length);
154
FD_CLR(process_itr->fd, &rfds_orig);
164
for(process *process_itr = process_list; process_itr != NULL;
165
process_itr = process_itr->next){
166
close(process_itr->fd);
167
kill(process_itr->pid, SIGTERM);
168
free(process_itr->buffer);
1107
if(p->next == NULL){
1108
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1114
/* Main loop while running plugins exist */
1116
fd_set rfds = rfds_all;
1117
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1118
if(select_ret == -1 and errno != EINTR){
1119
error(0, errno, "select");
1120
exitstatus = EX_OSERR;
1123
/* OK, now either a process completed, or something can be read
1125
for(plugin *proc = plugin_list; proc != NULL;){
1126
/* Is this process completely done? */
1127
if(proc->completed and proc->eof){
1128
/* Only accept the plugin output if it exited cleanly */
1129
if(not WIFEXITED(proc->status)
1130
or WEXITSTATUS(proc->status) != 0){
1131
/* Bad exit by plugin */
1134
if(WIFEXITED(proc->status)){
1135
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1136
" status %d\n", proc->name,
1137
(intmax_t) (proc->pid),
1138
WEXITSTATUS(proc->status));
1139
} else if(WIFSIGNALED(proc->status)){
1140
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1141
" signal %d: %s\n", proc->name,
1142
(intmax_t) (proc->pid),
1143
WTERMSIG(proc->status),
1144
strsignal(WTERMSIG(proc->status)));
1145
} else if(WCOREDUMP(proc->status)){
1146
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1147
" core\n", proc->name, (intmax_t) (proc->pid));
1151
/* Remove the plugin */
1152
#if defined (__GNUC__) and defined (__GLIBC__)
1153
#if not __GLIBC_PREREQ(2, 16)
1154
#pragma GCC diagnostic push
1155
#pragma GCC diagnostic ignored "-Wsign-conversion"
1158
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1159
-Wconversion in GNU libc
1161
#if defined (__GNUC__) and defined (__GLIBC__)
1162
#if not __GLIBC_PREREQ(2, 16)
1163
#pragma GCC diagnostic pop
1167
/* Block signal while modifying process_list */
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1170
&sigchld_action.sa_mask,
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
1178
plugin *next_plugin = proc->next;
1182
/* We are done modifying process list, so unblock signal */
1183
ret = (int)(TEMP_FAILURE_RETRY
1184
(sigprocmask(SIG_UNBLOCK,
1185
&sigchld_action.sa_mask, NULL)));
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1192
if(plugin_list == NULL){
1199
/* This process exited nicely, so print its buffer */
1201
bool bret = print_out_password(proc->buffer,
1202
proc->buffer_length);
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
1210
/* This process has not completed. Does it have any output? */
1211
#if defined (__GNUC__) and defined (__GLIBC__)
1212
#if not __GLIBC_PREREQ(2, 16)
1213
#pragma GCC diagnostic push
1214
#pragma GCC diagnostic ignored "-Wsign-conversion"
1217
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1223
#if defined (__GNUC__) and defined (__GLIBC__)
1224
#if not __GLIBC_PREREQ(2, 16)
1225
#pragma GCC diagnostic pop
1228
/* This process had nothing to say at this time */
1232
/* Before reading, make the process' data buffer large enough */
1233
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1234
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1235
+ (size_t) BUFFER_SIZE);
1236
if(new_buffer == NULL){
1237
error(0, errno, "malloc");
1238
exitstatus = EX_OSERR;
1241
proc->buffer = new_buffer;
1242
proc->buffer_size += BUFFER_SIZE;
1244
/* Read from the process */
1245
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1247
+ proc->buffer_length,
1250
/* Read error from this process; ignore the error */
1258
proc->buffer_length += (size_t) sret;
1266
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1267
and exitstatus != EX_OK)){
1268
/* Fallback if all plugins failed, none are found or an error
1271
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1272
char *passwordbuffer = getpass("Password: ");
1273
size_t len = strlen(passwordbuffer);
1274
/* Strip trailing newline */
1275
if(len > 0 and passwordbuffer[len-1] == '\n'){
1276
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1279
bret = print_out_password(passwordbuffer, len);
1281
error(0, errno, "print_out_password");
1282
exitstatus = EX_IOERR;
1286
/* Restore old signal handler */
1287
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1289
error(0, errno, "sigaction");
1290
exitstatus = EX_OSERR;
1293
if(custom_argv != NULL){
1294
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1304
/* Kill the processes */
1305
for(plugin *p = plugin_list; p != NULL; p = p->next){
1308
ret = kill(p->pid, SIGTERM);
1309
if(ret == -1 and errno != ESRCH){
1310
/* Set-uid proccesses might not get closed */
1311
error(0, errno, "kill");
1316
/* Wait for any remaining child processes to terminate */
1320
if(errno != ECHILD){
1321
error(0, errno, "wait");