1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
3
* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 2008-2013 Teddy Hogeborn
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* 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.
18
* 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/>.
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* Contact the authors at <mandos@recompile.se>.
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
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 */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
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stat, waitpid(), WIFEXITED(),
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WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
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#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
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FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
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WEXITSTATUS(), WTERMSIG(),
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), 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,
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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,
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EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
76
#define BUFFER_SIZE 256
78
#define PDIR "/lib/mandos/plugins.d"
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#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
84
typedef struct plugin{
85
char *name; /* can be NULL or any plugin name */
92
/* Variables used for running processes*/
99
volatile sig_atomic_t completed;
104
static plugin *plugin_list = NULL;
106
/* Gets an existing plugin based on name,
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
111
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))){
117
/* Create a new plugin */
118
plugin *new_plugin = NULL;
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
125
char *copy_name = NULL;
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
130
if(copy_name == NULL){
138
*new_plugin = (plugin){ .name = copy_name,
141
.next = plugin_list };
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
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new_plugin->argv[0] = copy_name;
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new_plugin->argv[1] = NULL;
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new_plugin->environ = malloc(sizeof(char *));
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} 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);
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new_plugin->environ[0] = NULL;
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/* Append the new plugin to the list */
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plugin_list = new_plugin;
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/* Helper function for add_argument and add_environment */
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__attribute__((nonnull, warn_unused_result))
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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 */
179
char **new_array = NULL;
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
185
if(new_array == NULL){
189
/* Make a copy of the new string */
193
} while(copy == NULL and errno == EINTR);
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/* Insert the copy */
198
(*array)[*len] = copy;
200
/* Add a new terminating NULL pointer to the last element */
201
(*array)[*len] = NULL;
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/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
static bool add_argument(plugin *p, const char *arg){
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return add_to_char_array(arg, &(p->argv), &(p->argc));
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
static bool add_environment(plugin *p, const char *def, bool replace){
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/* namelen = length of name of environment variable */
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
225
/* It already exists */
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
240
return add_to_char_array(def, &(p->environ), &(p->envc));
244
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
248
__attribute__((warn_unused_result))
249
static int set_cloexec_flag(int fd){
250
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
251
/* If reading the flags failed, return error indication now. */
255
/* Store modified flag word in the descriptor. */
256
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
261
/* Mark processes as completed when they exit, and save their exit
263
static void handle_sigchld(__attribute__((unused)) int sig){
264
int old_errno = errno;
266
plugin *proc = plugin_list;
268
pid_t pid = waitpid(-1, &status, WNOHANG);
270
/* Only still running child processes */
275
/* No child processes */
278
error(0, errno, "waitpid");
281
/* A child exited, find it in process_list */
282
while(proc != NULL and proc->pid != pid){
286
/* Process not found in process list */
289
proc->status = status;
295
/* Prints out a password to stdout */
296
__attribute__((nonnull, warn_unused_result))
297
static bool print_out_password(const char *buffer, size_t length){
299
for(size_t written = 0; written < length; written += (size_t)ret){
300
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
309
/* Removes and free a plugin from the plugin list */
310
__attribute__((nonnull))
311
static void free_plugin(plugin *plugin_node){
313
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
free(plugin_node->argv);
317
for(char **env = plugin_node->environ; *env != NULL; env++){
320
free(plugin_node->environ);
321
free(plugin_node->buffer);
323
/* Removes the plugin from the singly-linked list */
324
if(plugin_node == plugin_list){
325
/* First one - simple */
326
plugin_list = plugin_list->next;
328
/* Second one or later */
329
for(plugin *p = plugin_list; p != NULL; p = p->next){
330
if(p->next == plugin_node){
331
p->next = plugin_node->next;
340
static void free_plugin_list(void){
341
while(plugin_list != NULL){
342
free_plugin(plugin_list);
346
int main(int argc, char *argv[]){
347
char *plugindir = NULL;
348
char *argfile = NULL;
352
struct dirent *dirst;
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;
367
/* Establish a signal handler */
368
sigemptyset(&sigchld_action.sa_mask);
369
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
371
error(0, errno, "sigaddset");
372
exitstatus = EX_OSERR;
375
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
377
error(0, errno, "sigaction");
378
exitstatus = EX_OSERR;
382
/* The options we understand. */
383
struct argp_option options[] = {
384
{ .name = "global-options", .key = 'g',
385
.arg = "OPTION[,OPTION[,...]]",
386
.doc = "Options passed to all plugins" },
387
{ .name = "global-env", .key = 'G',
389
.doc = "Environment variable passed to all plugins" },
390
{ .name = "options-for", .key = 'o',
391
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
392
.doc = "Options passed only to specified plugin" },
393
{ .name = "env-for", .key = 'E',
394
.arg = "PLUGIN:ENV=value",
395
.doc = "Environment variable passed to specified plugin" },
396
{ .name = "disable", .key = 'd',
398
.doc = "Disable a specific plugin", .group = 1 },
399
{ .name = "enable", .key = 'e',
401
.doc = "Enable a specific plugin", .group = 1 },
402
{ .name = "plugin-dir", .key = 128,
404
.doc = "Specify a different plugin directory", .group = 2 },
405
{ .name = "config-file", .key = 129,
407
.doc = "Specify a different configuration file", .group = 2 },
408
{ .name = "userid", .key = 130,
409
.arg = "ID", .flags = 0,
410
.doc = "User ID the plugins will run as", .group = 3 },
411
{ .name = "groupid", .key = 131,
412
.arg = "ID", .flags = 0,
413
.doc = "Group ID the plugins will run as", .group = 3 },
414
{ .name = "debug", .key = 132,
415
.doc = "Debug mode", .group = 4 },
417
* These reproduce what we would get without ARGP_NO_HELP
419
{ .name = "help", .key = '?',
420
.doc = "Give this help list", .group = -1 },
421
{ .name = "usage", .key = -3,
422
.doc = "Give a short usage message", .group = -1 },
423
{ .name = "version", .key = 'V',
424
.doc = "Print program version", .group = -1 },
428
__attribute__((nonnull(3)))
429
error_t parse_opt(int key, char *arg, struct argp_state *state){
434
case 'g': /* --global-options */
437
while((plugin_option = strsep(&arg, ",")) != NULL){
438
if(not add_argument(getplugin(NULL), plugin_option)){
445
case 'G': /* --global-env */
446
if(add_environment(getplugin(NULL), arg, true)){
450
case 'o': /* --options-for */
452
char *option_list = strchr(arg, ':');
453
if(option_list == NULL){
454
argp_error(state, "No colon in \"%s\"", arg);
461
argp_error(state, "Empty plugin name");
466
while((option = strsep(&option_list, ",")) != NULL){
467
if(not add_argument(getplugin(arg), option)){
474
case 'E': /* --env-for */
476
char *envdef = strchr(arg, ':');
478
argp_error(state, "No colon in \"%s\"", arg);
485
argp_error(state, "Empty plugin name");
489
if(add_environment(getplugin(arg), envdef, true)){
494
case 'd': /* --disable */
496
plugin *p = getplugin(arg);
503
case 'e': /* --enable */
505
plugin *p = getplugin(arg);
512
case 128: /* --plugin-dir */
514
plugindir = strdup(arg);
515
if(plugindir != NULL){
519
case 129: /* --config-file */
520
/* This is already done by parse_opt_config_file() */
522
case 130: /* --userid */
523
tmp_id = strtoimax(arg, &tmp, 10);
524
if(errno != 0 or tmp == arg or *tmp != '\0'
525
or tmp_id != (uid_t)tmp_id){
526
argp_error(state, "Bad user ID number: \"%s\", using %"
527
PRIdMAX, arg, (intmax_t)uid);
533
case 131: /* --groupid */
534
tmp_id = strtoimax(arg, &tmp, 10);
535
if(errno != 0 or tmp == arg or *tmp != '\0'
536
or tmp_id != (gid_t)tmp_id){
537
argp_error(state, "Bad group ID number: \"%s\", using %"
538
PRIdMAX, arg, (intmax_t)gid);
544
case 132: /* --debug */
548
* These reproduce what we would get without ARGP_NO_HELP
550
case '?': /* --help */
551
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
552
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
553
case -3: /* --usage */
554
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
555
argp_state_help(state, state->out_stream,
556
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
557
case 'V': /* --version */
558
fprintf(state->out_stream, "%s\n", argp_program_version);
562
* When adding more options before this line, remember to also add a
563
* "case" to the "parse_opt_config_file" function below.
566
/* Cryptsetup always passes an argument, which is an empty
567
string if "none" was specified in /etc/crypttab. So if
568
argument was empty, we ignore it silently. */
573
return ARGP_ERR_UNKNOWN;
575
return errno; /* Set to 0 at start */
578
/* This option parser is the same as parse_opt() above, except it
579
ignores everything but the --config-file option. */
580
error_t parse_opt_config_file(int key, char *arg,
581
__attribute__((unused))
582
struct argp_state *state){
585
case 'g': /* --global-options */
586
case 'G': /* --global-env */
587
case 'o': /* --options-for */
588
case 'E': /* --env-for */
589
case 'd': /* --disable */
590
case 'e': /* --enable */
591
case 128: /* --plugin-dir */
593
case 129: /* --config-file */
595
argfile = strdup(arg);
600
case 130: /* --userid */
601
case 131: /* --groupid */
602
case 132: /* --debug */
603
case '?': /* --help */
604
case -3: /* --usage */
605
case 'V': /* --version */
609
return ARGP_ERR_UNKNOWN;
614
struct argp argp = { .options = options,
615
.parser = parse_opt_config_file,
617
.doc = "Mandos plugin runner -- Run plugins" };
619
/* Parse using parse_opt_config_file() in order to get the custom
620
config file location, if any. */
621
ret = argp_parse(&argp, argc, argv,
622
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
630
error(0, errno, "argp_parse");
631
exitstatus = EX_OSERR;
634
exitstatus = EX_USAGE;
638
/* Reset to the normal argument parser */
639
argp.parser = parse_opt;
641
/* Open the configfile if available */
643
conffp = fopen(AFILE, "r");
645
conffp = fopen(argfile, "r");
648
char *org_line = NULL;
649
char *p, *arg, *new_arg, *line;
651
const char whitespace_delims[] = " \r\t\f\v\n";
652
const char comment_delim[] = "#";
655
custom_argv = malloc(sizeof(char*) * 2);
656
if(custom_argv == NULL){
657
error(0, errno, "malloc");
658
exitstatus = EX_OSERR;
661
custom_argv[0] = argv[0];
662
custom_argv[1] = NULL;
664
/* for each line in the config file, strip whitespace and ignore
667
sret = getline(&org_line, &size, conffp);
673
arg = strsep(&line, comment_delim);
674
while((p = strsep(&arg, whitespace_delims)) != NULL){
680
error(0, errno, "strdup");
681
exitstatus = EX_OSERR;
688
char **new_argv = realloc(custom_argv, sizeof(char *)
691
if(new_argv == NULL){
692
error(0, errno, "realloc");
693
exitstatus = EX_OSERR;
698
custom_argv = new_argv;
701
custom_argv[custom_argc-1] = new_arg;
702
custom_argv[custom_argc] = NULL;
706
ret = fclose(conffp);
707
} while(ret == EOF and errno == EINTR);
709
error(0, errno, "fclose");
710
exitstatus = EX_IOERR;
715
/* Check for harmful errors and go to fallback. Other errors might
716
not affect opening plugins */
717
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
718
error(0, errno, "fopen");
719
exitstatus = EX_OSERR;
723
/* If there were any arguments from the configuration file, pass
724
them to parser as command line arguments */
725
if(custom_argv != NULL){
726
ret = argp_parse(&argp, custom_argc, custom_argv,
727
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
735
error(0, errno, "argp_parse");
736
exitstatus = EX_OSERR;
739
exitstatus = EX_CONFIG;
744
/* Parse actual command line arguments, to let them override the
746
ret = argp_parse(&argp, argc, argv,
747
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
755
error(0, errno, "argp_parse");
756
exitstatus = EX_OSERR;
759
exitstatus = EX_USAGE;
764
for(plugin *p = plugin_list; p != NULL; p=p->next){
765
fprintf(stderr, "Plugin: %s has %d arguments\n",
766
p->name ? p->name : "Global", p->argc - 1);
767
for(char **a = p->argv; *a != NULL; a++){
768
fprintf(stderr, "\tArg: %s\n", *a);
770
fprintf(stderr, "...and %d environment variables\n", p->envc);
771
for(char **a = p->environ; *a != NULL; a++){
772
fprintf(stderr, "\t%s\n", *a);
778
/* Work around Debian bug #633582:
779
<http://bugs.debian.org/633582> */
780
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
781
if(plugindir_fd == -1){
782
error(0, errno, "open");
784
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
786
error(0, errno, "fstat");
788
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
789
ret = fchown(plugindir_fd, uid, gid);
791
error(0, errno, "fchown");
795
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
/* Lower permissions */
802
error(0, errno, "setgid");
806
error(0, errno, "setuid");
809
/* Open plugin directory with close_on_exec flag */
812
if(plugindir == NULL){
813
dir_fd = open(PDIR, O_RDONLY |
816
#else /* not O_CLOEXEC */
818
#endif /* not O_CLOEXEC */
821
dir_fd = open(plugindir, O_RDONLY |
824
#else /* not O_CLOEXEC */
826
#endif /* not O_CLOEXEC */
830
error(0, errno, "Could not open plugin dir");
831
exitstatus = EX_UNAVAILABLE;
836
/* Set the FD_CLOEXEC flag on the directory */
837
ret = set_cloexec_flag(dir_fd);
839
error(0, errno, "set_cloexec_flag");
840
TEMP_FAILURE_RETRY(close(dir_fd));
841
exitstatus = EX_OSERR;
844
#endif /* O_CLOEXEC */
846
dir = fdopendir(dir_fd);
848
error(0, errno, "Could not open plugin dir");
849
TEMP_FAILURE_RETRY(close(dir_fd));
850
exitstatus = EX_OSERR;
857
/* Read and execute any executable in the plugin directory*/
860
dirst = readdir(dir);
861
} while(dirst == NULL and errno == EINTR);
863
/* All directory entries have been processed */
866
error(0, errno, "readdir");
867
exitstatus = EX_IOERR;
873
d_name_len = strlen(dirst->d_name);
875
/* Ignore dotfiles, backup files and other junk */
877
bool bad_name = false;
879
const char * const bad_prefixes[] = { ".", "#", NULL };
881
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
884
".dpkg-divert", NULL };
886
#pragma GCC diagnostic push
887
#pragma GCC diagnostic ignored "-Wcast-qual"
889
for(const char **pre = (const char **)bad_prefixes;
890
*pre != NULL; pre++){
892
#pragma GCC diagnostic pop
894
size_t pre_len = strlen(*pre);
895
if((d_name_len >= pre_len)
896
and strncmp((dirst->d_name), *pre, pre_len) == 0){
898
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
899
" with bad prefix %s\n", dirst->d_name, *pre);
909
#pragma GCC diagnostic push
910
#pragma GCC diagnostic ignored "-Wcast-qual"
912
for(const char **suf = (const char **)bad_suffixes;
913
*suf != NULL; suf++){
915
#pragma GCC diagnostic pop
917
size_t suf_len = strlen(*suf);
918
if((d_name_len >= suf_len)
919
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
922
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
923
" with bad suffix %s\n", dirst->d_name, *suf);
936
if(plugindir == NULL){
937
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
940
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
945
error(0, errno, "asprintf");
949
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
951
error(0, errno, "stat");
956
/* Ignore non-executable files */
957
if(not S_ISREG(st.st_mode)
958
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
960
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
961
" with bad type or mode\n", filename);
967
plugin *p = getplugin(dirst->d_name);
969
error(0, errno, "getplugin");
975
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
982
/* Add global arguments to argument list for this plugin */
983
plugin *g = getplugin(NULL);
985
for(char **a = g->argv + 1; *a != NULL; a++){
986
if(not add_argument(p, *a)){
987
error(0, errno, "add_argument");
990
/* Add global environment variables */
991
for(char **e = g->environ; *e != NULL; e++){
992
if(not add_environment(p, *e, false)){
993
error(0, errno, "add_environment");
998
/* If this plugin has any environment variables, we will call
999
using execve and need to duplicate the environment from this
1001
if(p->environ[0] != NULL){
1002
for(char **e = environ; *e != NULL; e++){
1003
if(not add_environment(p, *e, false)){
1004
error(0, errno, "add_environment");
1010
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1012
error(0, errno, "pipe");
1013
exitstatus = EX_OSERR;
1016
/* Ask OS to automatic close the pipe on exec */
1017
ret = set_cloexec_flag(pipefd[0]);
1019
error(0, errno, "set_cloexec_flag");
1020
exitstatus = EX_OSERR;
1023
ret = set_cloexec_flag(pipefd[1]);
1025
error(0, errno, "set_cloexec_flag");
1026
exitstatus = EX_OSERR;
1029
/* Block SIGCHLD until process is safely in process list */
1030
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1031
&sigchld_action.sa_mask,
1034
error(0, errno, "sigprocmask");
1035
exitstatus = EX_OSERR;
1038
/* Starting a new process to be watched */
1042
} while(pid == -1 and errno == EINTR);
1044
error(0, errno, "fork");
1045
exitstatus = EX_OSERR;
1049
/* this is the child process */
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1052
error(0, errno, "sigaction");
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1057
error(0, errno, "sigprocmask");
1061
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1063
error(0, errno, "dup2");
1068
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1069
above and must now close it manually here. */
1072
if(p->environ[0] == NULL){
1073
if(execv(filename, p->argv) < 0){
1074
error(0, errno, "execv for %s", filename);
1078
if(execve(filename, p->argv, p->environ) < 0){
1079
error(0, errno, "execve for %s", filename);
1085
/* Parent process */
1086
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1089
plugin *new_plugin = getplugin(dirst->d_name);
1090
if(new_plugin == NULL){
1091
error(0, errno, "getplugin");
1092
ret = (int)(TEMP_FAILURE_RETRY
1093
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1096
error(0, errno, "sigprocmask");
1098
exitstatus = EX_OSERR;
1102
new_plugin->pid = pid;
1103
new_plugin->fd = pipefd[0];
1105
/* Unblock SIGCHLD so signal handler can be run if this process
1106
has already completed */
1107
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1108
&sigchld_action.sa_mask,
1111
error(0, errno, "sigprocmask");
1112
exitstatus = EX_OSERR;
1116
#if defined (__GNUC__) and defined (__GLIBC__)
1117
#if not __GLIBC_PREREQ(2, 16)
1118
#pragma GCC diagnostic push
1119
#pragma GCC diagnostic ignored "-Wsign-conversion"
1122
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1123
-Wconversion in GNU libc
1125
#if defined (__GNUC__) and defined (__GLIBC__)
1126
#if not __GLIBC_PREREQ(2, 16)
1127
#pragma GCC diagnostic pop
1131
if(maxfd < new_plugin->fd){
1132
maxfd = new_plugin->fd;
1136
TEMP_FAILURE_RETRY(closedir(dir));
1138
free_plugin(getplugin(NULL));
1140
for(plugin *p = plugin_list; p != NULL; p = p->next){
1144
if(p->next == NULL){
1145
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1151
/* Main loop while running plugins exist */
1153
fd_set rfds = rfds_all;
1154
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1155
if(select_ret == -1 and errno != EINTR){
1156
error(0, errno, "select");
1157
exitstatus = EX_OSERR;
1160
/* OK, now either a process completed, or something can be read
1162
for(plugin *proc = plugin_list; proc != NULL;){
1163
/* Is this process completely done? */
1164
if(proc->completed and proc->eof){
1165
/* Only accept the plugin output if it exited cleanly */
1166
if(not WIFEXITED(proc->status)
1167
or WEXITSTATUS(proc->status) != 0){
1168
/* Bad exit by plugin */
1171
if(WIFEXITED(proc->status)){
1172
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1173
" status %d\n", proc->name,
1174
(intmax_t) (proc->pid),
1175
WEXITSTATUS(proc->status));
1176
} else if(WIFSIGNALED(proc->status)){
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1178
" signal %d: %s\n", proc->name,
1179
(intmax_t) (proc->pid),
1180
WTERMSIG(proc->status),
1181
strsignal(WTERMSIG(proc->status)));
1182
} else if(WCOREDUMP(proc->status)){
1183
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1184
" core\n", proc->name, (intmax_t) (proc->pid));
1188
/* Remove the plugin */
1189
#if defined (__GNUC__) and defined (__GLIBC__)
1190
#if not __GLIBC_PREREQ(2, 16)
1191
#pragma GCC diagnostic push
1192
#pragma GCC diagnostic ignored "-Wsign-conversion"
1195
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1196
-Wconversion in GNU libc
1198
#if defined (__GNUC__) and defined (__GLIBC__)
1199
#if not __GLIBC_PREREQ(2, 16)
1200
#pragma GCC diagnostic pop
1204
/* Block signal while modifying process_list */
1205
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1207
&sigchld_action.sa_mask,
1210
error(0, errno, "sigprocmask");
1211
exitstatus = EX_OSERR;
1215
plugin *next_plugin = proc->next;
1219
/* We are done modifying process list, so unblock signal */
1220
ret = (int)(TEMP_FAILURE_RETRY
1221
(sigprocmask(SIG_UNBLOCK,
1222
&sigchld_action.sa_mask, NULL)));
1224
error(0, errno, "sigprocmask");
1225
exitstatus = EX_OSERR;
1229
if(plugin_list == NULL){
1236
/* This process exited nicely, so print its buffer */
1238
bool bret = print_out_password(proc->buffer,
1239
proc->buffer_length);
1241
error(0, errno, "print_out_password");
1242
exitstatus = EX_IOERR;
1247
/* This process has not completed. Does it have any output? */
1248
#if defined (__GNUC__) and defined (__GLIBC__)
1249
#if not __GLIBC_PREREQ(2, 16)
1250
#pragma GCC diagnostic push
1251
#pragma GCC diagnostic ignored "-Wsign-conversion"
1254
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1260
#if defined (__GNUC__) and defined (__GLIBC__)
1261
#if not __GLIBC_PREREQ(2, 16)
1262
#pragma GCC diagnostic pop
1265
/* This process had nothing to say at this time */
1269
/* Before reading, make the process' data buffer large enough */
1270
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1271
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1272
+ (size_t) BUFFER_SIZE);
1273
if(new_buffer == NULL){
1274
error(0, errno, "malloc");
1275
exitstatus = EX_OSERR;
1278
proc->buffer = new_buffer;
1279
proc->buffer_size += BUFFER_SIZE;
1281
/* Read from the process */
1282
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1284
+ proc->buffer_length,
1287
/* Read error from this process; ignore the error */
1295
proc->buffer_length += (size_t) sret;
1303
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1304
and exitstatus != EX_OK)){
1305
/* Fallback if all plugins failed, none are found or an error
1308
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1309
char *passwordbuffer = getpass("Password: ");
1310
size_t len = strlen(passwordbuffer);
1311
/* Strip trailing newline */
1312
if(len > 0 and passwordbuffer[len-1] == '\n'){
1313
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1316
bret = print_out_password(passwordbuffer, len);
1318
error(0, errno, "print_out_password");
1319
exitstatus = EX_IOERR;
1323
/* Restore old signal handler */
1324
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1326
error(0, errno, "sigaction");
1327
exitstatus = EX_OSERR;
1330
if(custom_argv != NULL){
1331
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1341
/* Kill the processes */
1342
for(plugin *p = plugin_list; p != NULL; p = p->next){
1345
ret = kill(p->pid, SIGTERM);
1346
if(ret == -1 and errno != ESRCH){
1347
/* Set-uid proccesses might not get closed */
1348
error(0, errno, "kill");
1353
/* Wait for any remaining child processes to terminate */
1357
if(errno != ECHILD){
1358
error(0, errno, "wait");