19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG(),
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
97
89
size_t buffer_size;
98
90
size_t buffer_length;
100
volatile sig_atomic_t completed;
92
volatile bool completed;
102
94
struct plugin *next;
105
97
static plugin *plugin_list = NULL;
107
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
108
100
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
101
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))){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
118
109
/* 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){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
126
114
char *copy_name = NULL;
127
115
if(name != NULL){
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
131
117
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){
122
*new_plugin = (plugin) { .name = copy_name,
125
.next = plugin_list };
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
150
130
free(new_plugin);
154
133
new_plugin->argv[0] = copy_name;
155
134
new_plugin->argv[1] = NULL;
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
160
137
if(new_plugin->environ == NULL){
163
139
free(new_plugin->argv);
164
140
free(new_plugin);
168
143
new_plugin->environ[0] = NULL;
215
181
/* 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){
182
static bool add_environment(plugin *p, const char *def){
221
186
/* namelen = length of name of environment variable */
222
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
188
/* 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);
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* Refuse to add an existing variable */
241
195
return add_to_char_array(def, &(p->environ), &(p->envc));
246
199
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
200
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
201
* *Note File Descriptor Flags:(libc)Descriptor Flags.
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
203
static int set_cloexec_flag(int fd)
205
int ret = fcntl(fd, F_GETFD, 0);
253
206
/* If reading the flags failed, return error indication now. */
257
210
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
211
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
261
#endif /* not O_CLOEXEC */
264
215
/* Mark processes as completed when they exit, and save their exit
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
217
void handle_sigchld(__attribute__((unused)) int sig){
269
219
plugin *proc = plugin_list;
387
336
{ .name = "global-options", .key = 'g',
388
337
.arg = "OPTION[,OPTION[,...]]",
389
338
.doc = "Options passed to all plugins" },
390
{ .name = "global-env", .key = 'G',
339
{ .name = "global-env", .key = 'e',
391
340
.arg = "VAR=value",
392
341
.doc = "Environment variable passed to all plugins" },
393
342
{ .name = "options-for", .key = 'o',
394
343
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
395
344
.doc = "Options passed only to specified plugin" },
396
{ .name = "env-for", .key = 'E',
345
{ .name = "env-for", .key = 'f',
397
346
.arg = "PLUGIN:ENV=value",
398
347
.doc = "Environment variable passed to specified plugin" },
399
348
{ .name = "disable", .key = 'd',
401
350
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
404
.doc = "Enable a specific plugin", .group = 1 },
405
351
{ .name = "plugin-dir", .key = 128,
406
352
.arg = "DIRECTORY",
407
353
.doc = "Specify a different plugin directory", .group = 2 },
416
362
.doc = "Group ID the plugins will run as", .group = 3 },
417
363
{ .name = "debug", .key = 132,
418
364
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
421
.doc = "Specify a different plugin helper directory",
424
* These reproduce what we would get without ARGP_NO_HELP
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
368
error_t parse_opt (int key, char *arg, __attribute__((unused))
369
struct argp_state *state) {
370
/* Get the INPUT argument from `argp_parse', which we know is a
371
pointer to our plugin list pointer. */
441
373
case 'g': /* --global-options */
376
while((p = strsep(&arg, ",")) != NULL){
380
if(not add_argument(getplugin(NULL), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
387
case 'e': /* --global-env */
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
452
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
392
char *envdef = strdup(arg);
396
if(not add_environment(getplugin(NULL), envdef)){
397
perror("add_environment");
457
401
case 'o': /* --options-for */
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
468
argp_error(state, "Empty plugin name");
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0'){
407
char *opt = strsep(&arg, ":");
413
while((p = strsep(&opt, ",")) != NULL){
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
481
case 'E': /* --env-for */
425
case 'f': /* --env-for */
483
430
char *envdef = strchr(arg, ':');
484
431
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
434
char *p_name = strndup(arg, (size_t) (envdef-arg));
492
argp_error(state, "Empty plugin name");
496
if(add_environment(getplugin(arg), envdef, true)){
439
if(not add_environment(getplugin(p_name), envdef)){
440
perror("add_environment");
501
444
case 'd': /* --disable */
503
plugin *p = getplugin(arg);
510
case 'e': /* --enable */
512
plugin *p = getplugin(arg);
446
plugin *p = getplugin(arg);
448
return ARGP_ERR_UNKNOWN;
519
453
case 128: /* --plugin-dir */
521
454
plugindir = strdup(arg);
522
if(plugindir != NULL){
455
if(plugindir == NULL){
526
459
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
460
argfile = strdup(arg);
529
465
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
466
uid = (uid_t)strtol(arg, NULL, 10);
540
468
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
469
gid = (gid_t)strtol(arg, NULL, 10);
551
471
case 132: /* --debug */
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
562
* These reproduce what we would get without ARGP_NO_HELP
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
587
return ARGP_ERR_UNKNOWN;
589
return errno; /* Set to 0 at start */
592
/* This option parser is the same as parse_opt() above, except it
593
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
599
case 'g': /* --global-options */
600
case 'G': /* --global-env */
601
case 'o': /* --options-for */
602
case 'E': /* --env-for */
603
case 'd': /* --disable */
604
case 'e': /* --enable */
605
case 128: /* --plugin-dir */
607
case 129: /* --config-file */
609
argfile = strdup(arg);
614
case 130: /* --userid */
615
case 131: /* --groupid */
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
624
return ARGP_ERR_UNKNOWN;
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
475
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
480
return ARGP_ERR_UNKNOWN;
485
struct argp argp = { .options = options, .parser = parse_opt,
486
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
632
487
.doc = "Mandos plugin runner -- Run plugins" };
634
/* Parse using parse_opt_config_file() in order to get the custom
635
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
649
exitstatus = EX_USAGE;
489
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
490
if (ret == ARGP_ERR_UNKNOWN){
491
fprintf(stderr, "Unknown error while parsing arguments\n");
492
exitstatus = EXIT_FAILURE;
653
/* Reset to the normal argument parser */
654
argp.parser = parse_opt;
656
/* Open the configfile if available */
496
/* Opens the configfile if aviable */
497
if (argfile == NULL){
658
498
conffp = fopen(AFILE, "r");
660
500
conffp = fopen(argfile, "r");
662
502
if(conffp != NULL){
663
503
char *org_line = NULL;
664
504
char *p, *arg, *new_arg, *line;
666
507
const char whitespace_delims[] = " \r\t\f\v\n";
667
508
const char comment_delim[] = "#";
670
511
custom_argv = malloc(sizeof(char*) * 2);
671
512
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
514
exitstatus = EXIT_FAILURE;
676
517
custom_argv[0] = argv[0];
677
518
custom_argv[1] = NULL;
679
520
/* for each line in the config file, strip whitespace and ignore
680
521
commented text */
693
534
new_arg = strdup(p);
694
535
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
537
exitstatus = EXIT_FAILURE;
701
542
custom_argc += 1;
703
char **new_argv = realloc(custom_argv, sizeof(char *)
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
713
custom_argv = new_argv;
543
custom_argv = realloc(custom_argv, sizeof(char *)
544
* ((unsigned int) custom_argc + 1));
545
if(custom_argv == NULL){
547
exitstatus = EXIT_FAILURE;
716
551
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
552
custom_argv[custom_argc] = NULL;
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
730
557
/* Check for harmful errors and go to fallback. Other errors might
731
558
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
559
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
561
exitstatus = EXIT_FAILURE;
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
565
/* If there was any arguments from configuration file,
566
pass them to parser as command arguments */
740
567
if(custom_argv != NULL){
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
754
exitstatus = EX_CONFIG;
759
/* Parse actual command line arguments, to let them override the
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
774
exitstatus = EX_USAGE;
779
char *pluginhelperenv;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
792
free(pluginhelperenv);
568
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
569
if (ret == ARGP_ERR_UNKNOWN){
570
fprintf(stderr, "Unknown error while parsing arguments\n");
571
exitstatus = EXIT_FAILURE;
800
580
for(char **a = p->argv; *a != NULL; a++){
801
581
fprintf(stderr, "\tArg: %s\n", *a);
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
583
fprintf(stderr, "...and %u environment variables\n", p->envc);
804
584
for(char **a = p->environ; *a != NULL; a++){
805
585
fprintf(stderr, "\t%s\n", *a);
811
/* Work around Debian bug #633582:
812
<http://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
816
error(0, errno, "open(\"" PDIR "\")");
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
821
error(0, errno, "fstat");
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
826
error(0, errno, "fchown");
830
TEMP_FAILURE_RETRY(close(plugindir_fd));
834
/* Lower permissions */
837
error(0, errno, "setgid");
590
/* Strip permissions down to nobody */
839
591
ret = setuid(uid);
841
error(0, errno, "setuid");
844
/* Open plugin directory with close_on_exec flag */
600
if (plugindir == NULL){
603
dir = opendir(plugindir);
607
perror("Could not open plugin dir");
608
exitstatus = EXIT_FAILURE;
612
/* Set the FD_CLOEXEC flag on the directory, if possible */
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
849
#else /* not O_CLOEXEC */
851
#endif /* not O_CLOEXEC */
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
867
#endif /* O_CLOEXEC */
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
881
#pragma GCC diagnostic pop
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
614
int dir_fd = dirfd(dir);
616
ret = set_cloexec_flag(dir_fd);
618
perror("set_cloexec_flag");
619
exitstatus = EXIT_FAILURE;
896
#if __GLIBC_PREREQ(2, 15)
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
899
#else /* not __GLIBC_PREREQ(2, 15) */
900
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
901
&direntries, good_name, alphasort);
902
#endif /* not __GLIBC_PREREQ(2, 15) */
903
#else /* not __GLIBC__ */
904
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
905
&direntries, good_name, alphasort);
906
#endif /* not __GLIBC__ */
907
if(numplugins == -1){
908
error(0, errno, "Could not scan plugin dir");
910
exitstatus = EX_OSERR;
914
625
FD_ZERO(&rfds_all);
916
627
/* Read and execute any executable in the plugin directory*/
917
for(int i = 0; i < numplugins; i++){
919
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
921
error(0, errno, "Could not open plugin");
925
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
927
error(0, errno, "stat");
928
TEMP_FAILURE_RETRY(close(plugin_fd));
629
dirst = readdir(dir);
631
// All directory entries have been processed
635
exitstatus = EXIT_FAILURE;
641
d_name_len = strlen(dirst->d_name);
643
// Ignore dotfiles, backup files and other junk
645
bool bad_name = false;
647
const char const *bad_prefixes[] = { ".", "#", NULL };
649
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
651
".dpkg-divert", NULL };
652
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
653
size_t pre_len = strlen(*pre);
654
if((d_name_len >= pre_len)
655
and strncmp((dirst->d_name), *pre, pre_len) == 0){
657
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
658
" with bad prefix %s\n", dirst->d_name, *pre);
667
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
668
size_t suf_len = strlen(*suf);
669
if((d_name_len >= suf_len)
670
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
673
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
674
" with bad suffix %s\n", dirst->d_name, *suf);
687
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
693
ret = stat(filename, &st);
933
700
/* Ignore non-executable files */
934
if(not S_ISREG(st.st_mode)
935
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
701
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
939
" with bad type or mode\n",
940
plugindir != NULL ? plugindir : PDIR,
941
direntries[i]->d_name);
703
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
704
" with bad type or mode\n", filename);
943
TEMP_FAILURE_RETRY(close(plugin_fd));
948
plugin *p = getplugin(direntries[i]->d_name);
710
plugin *p = getplugin(dirst->d_name);
950
error(0, errno, "getplugin");
951
TEMP_FAILURE_RETRY(close(plugin_fd));
957
718
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
958
direntries[i]->d_name);
960
TEMP_FAILURE_RETRY(close(plugin_fd));
968
728
for(char **a = g->argv + 1; *a != NULL; a++){
969
729
if(not add_argument(p, *a)){
970
error(0, errno, "add_argument");
730
perror("add_argument");
973
733
/* Add global environment variables */
974
734
for(char **e = g->environ; *e != NULL; e++){
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
735
if(not add_environment(p, *e)){
736
perror("add_environment");
981
/* If this plugin has any environment variables, we need to
982
duplicate the environment from this process, too. */
741
/* If this plugin has any environment variables, we will call
742
using execve and need to duplicate the environment from this
983
744
if(p->environ[0] != NULL){
984
745
for(char **e = environ; *e != NULL; e++){
985
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
746
char *copy = strdup(*e);
751
if(not add_environment(p, copy)){
752
perror("add_environment");
993
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
994
#else /* O_CLOEXEC */
995
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
996
#endif /* O_CLOEXEC */
998
error(0, errno, "pipe");
999
exitstatus = EX_OSERR;
1000
free(direntries[i]);
1003
if(pipefd[0] >= FD_SETSIZE){
1004
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1006
TEMP_FAILURE_RETRY(close(pipefd[0]));
1007
TEMP_FAILURE_RETRY(close(pipefd[1]));
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
761
exitstatus = EXIT_FAILURE;
1013
764
/* Ask OS to automatic close the pipe on exec */
1014
765
ret = set_cloexec_flag(pipefd[0]);
1016
error(0, errno, "set_cloexec_flag");
1017
TEMP_FAILURE_RETRY(close(pipefd[0]));
1018
TEMP_FAILURE_RETRY(close(pipefd[1]));
1019
exitstatus = EX_OSERR;
1020
free(direntries[i]);
767
perror("set_cloexec_flag");
768
exitstatus = EXIT_FAILURE;
1023
771
ret = set_cloexec_flag(pipefd[1]);
1025
error(0, errno, "set_cloexec_flag");
1026
TEMP_FAILURE_RETRY(close(pipefd[0]));
1027
TEMP_FAILURE_RETRY(close(pipefd[1]));
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
773
perror("set_cloexec_flag");
774
exitstatus = EXIT_FAILURE;
1032
#endif /* not O_CLOEXEC */
1033
777
/* Block SIGCHLD until process is safely in process list */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1035
&sigchld_action.sa_mask,
778
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1038
error(0, errno, "sigprocmask");
1039
exitstatus = EX_OSERR;
1040
free(direntries[i]);
780
perror("sigprocmask");
781
exitstatus = EXIT_FAILURE;
1043
/* Starting a new process to be watched */
1047
} while(pid == -1 and errno == EINTR);
784
// Starting a new process to be watched
1049
error(0, errno, "fork");
1050
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL));
1052
TEMP_FAILURE_RETRY(close(pipefd[0]));
1053
TEMP_FAILURE_RETRY(close(pipefd[1]));
1054
exitstatus = EX_OSERR;
1055
free(direntries[i]);
788
exitstatus = EXIT_FAILURE;
1059
792
/* this is the child process */
1060
793
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1062
error(0, errno, "sigaction");
1065
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
798
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1067
error(0, errno, "sigprocmask");
800
perror("sigprocmask");
1071
804
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1073
error(0, errno, "dup2");
1077
if(fexecve(plugin_fd, p->argv,
1078
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1079
error(0, errno, "fexecve for %s/%s",
1080
plugindir != NULL ? plugindir : PDIR,
1081
direntries[i]->d_name);
811
/* If dir has no file descriptor, we could not set FD_CLOEXEC
812
above and must now close it manually here. */
815
if(p->environ[0] == NULL){
816
if(execv(filename, p->argv) < 0){
821
if(execve(filename, p->argv, p->environ) < 0){
1086
828
/* Parent process */
1087
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1089
TEMP_FAILURE_RETRY(close(plugin_fd));
1090
plugin *new_plugin = getplugin(direntries[i]->d_name);
1091
if(new_plugin == NULL){
1092
error(0, errno, "getplugin");
1093
ret = (int)(TEMP_FAILURE_RETRY
1094
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
829
close(pipefd[1]); /* Close unused write end of pipe */
831
plugin *new_plugin = getplugin(dirst->d_name);
832
if (new_plugin == NULL){
834
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1097
error(0, errno, "sigprocmask");
836
perror("sigprocmask");
1099
exitstatus = EX_OSERR;
1100
free(direntries[i]);
838
exitstatus = EXIT_FAILURE;
1103
free(direntries[i]);
1105
842
new_plugin->pid = pid;
1106
843
new_plugin->fd = pipefd[0];
1108
845
/* Unblock SIGCHLD so signal handler can be run if this process
1109
846
has already completed */
1110
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1111
&sigchld_action.sa_mask,
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1114
error(0, errno, "sigprocmask");
1115
exitstatus = EX_OSERR;
849
perror("sigprocmask");
850
exitstatus = EXIT_FAILURE;
1119
#if defined (__GNUC__) and defined (__GLIBC__)
1120
#if not __GLIBC_PREREQ(2, 16)
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wsign-conversion"
1125
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1126
-Wconversion in GNU libc
1128
#if defined (__GNUC__) and defined (__GLIBC__)
1129
#if not __GLIBC_PREREQ(2, 16)
1130
#pragma GCC diagnostic pop
854
FD_SET(new_plugin->fd, &rfds_all);
1134
if(maxfd < new_plugin->fd){
856
if (maxfd < new_plugin->fd){
1135
857
maxfd = new_plugin->fd;
1141
TEMP_FAILURE_RETRY(close(dir_fd));
1143
free_plugin(getplugin(NULL));
1145
865
for(plugin *p = plugin_list; p != NULL; p = p->next){
1146
866
if(p->pid != 0){
1152
872
free_plugin_list();
1156
876
/* Main loop while running plugins exist */
1157
877
while(plugin_list){
1158
878
fd_set rfds = rfds_all;
1159
879
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1160
if(select_ret == -1 and errno != EINTR){
1161
error(0, errno, "select");
1162
exitstatus = EX_OSERR;
880
if (select_ret == -1){
882
exitstatus = EXIT_FAILURE;
1165
885
/* OK, now either a process completed, or something can be read
1166
886
from one of them */
1167
for(plugin *proc = plugin_list; proc != NULL;){
887
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1168
888
/* Is this process completely done? */
1169
if(proc->completed and proc->eof){
889
if(proc->eof and proc->completed){
1170
890
/* Only accept the plugin output if it exited cleanly */
1171
891
if(not WIFEXITED(proc->status)
1172
892
or WEXITSTATUS(proc->status) != 0){
1173
893
/* Bad exit by plugin */
1176
896
if(WIFEXITED(proc->status)){
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1178
" status %d\n", proc->name,
1179
(intmax_t) (proc->pid),
897
fprintf(stderr, "Plugin %u exited with status %d\n",
898
(unsigned int) (proc->pid),
1180
899
WEXITSTATUS(proc->status));
1181
} else if(WIFSIGNALED(proc->status)){
1182
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1183
" signal %d: %s\n", proc->name,
1184
(intmax_t) (proc->pid),
1185
WTERMSIG(proc->status),
1186
strsignal(WTERMSIG(proc->status)));
900
} else if(WIFSIGNALED(proc->status)) {
901
fprintf(stderr, "Plugin %u killed by signal %d\n",
902
(unsigned int) (proc->pid),
903
WTERMSIG(proc->status));
1187
904
} else if(WCOREDUMP(proc->status)){
1188
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1189
" core\n", proc->name, (intmax_t) (proc->pid));
905
fprintf(stderr, "Plugin %d dumped core\n",
906
(unsigned int) (proc->pid));
1193
910
/* Remove the plugin */
1194
#if defined (__GNUC__) and defined (__GLIBC__)
1195
#if not __GLIBC_PREREQ(2, 16)
1196
#pragma GCC diagnostic push
1197
#pragma GCC diagnostic ignored "-Wsign-conversion"
1200
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1201
-Wconversion in GNU libc
1203
#if defined (__GNUC__) and defined (__GLIBC__)
1204
#if not __GLIBC_PREREQ(2, 16)
1205
#pragma GCC diagnostic pop
911
FD_CLR(proc->fd, &rfds_all);
1209
913
/* Block signal while modifying process_list */
1210
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1212
&sigchld_action.sa_mask,
914
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1215
error(0, errno, "sigprocmask");
1216
exitstatus = EX_OSERR;
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1220
plugin *next_plugin = proc->next;
1221
920
free_plugin(proc);
1224
921
/* We are done modifying process list, so unblock signal */
1225
ret = (int)(TEMP_FAILURE_RETRY
1226
(sigprocmask(SIG_UNBLOCK,
1227
&sigchld_action.sa_mask, NULL)));
922
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1229
error(0, errno, "sigprocmask");
1230
exitstatus = EX_OSERR;
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1234
930
if(plugin_list == NULL){
1241
936
/* This process exited nicely, so print its buffer */
1243
938
bool bret = print_out_password(proc->buffer,
1244
939
proc->buffer_length);
1246
error(0, errno, "print_out_password");
1247
exitstatus = EX_IOERR;
941
perror("print_out_password");
942
exitstatus = EXIT_FAILURE;
1252
947
/* This process has not completed. Does it have any output? */
1253
#if defined (__GNUC__) and defined (__GLIBC__)
1254
#if not __GLIBC_PREREQ(2, 16)
1255
#pragma GCC diagnostic push
1256
#pragma GCC diagnostic ignored "-Wsign-conversion"
1259
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1265
#if defined (__GNUC__) and defined (__GLIBC__)
1266
#if not __GLIBC_PREREQ(2, 16)
1267
#pragma GCC diagnostic pop
948
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1270
949
/* This process had nothing to say at this time */
1274
952
/* Before reading, make the process' data buffer large enough */
1275
953
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1276
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1277
+ (size_t) BUFFER_SIZE);
1278
if(new_buffer == NULL){
1279
error(0, errno, "malloc");
1280
exitstatus = EX_OSERR;
954
proc->buffer = realloc(proc->buffer, proc->buffer_size
955
+ (size_t) BUFFER_SIZE);
956
if (proc->buffer == NULL){
958
exitstatus = EXIT_FAILURE;
1283
proc->buffer = new_buffer;
1284
961
proc->buffer_size += BUFFER_SIZE;
1286
963
/* Read from the process */
1287
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1289
+ proc->buffer_length,
964
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1292
967
/* Read error from this process; ignore the error */
1298
972
proc->eof = true;
1300
proc->buffer_length += (size_t) sret;
974
proc->buffer_length += (size_t) ret;
1308
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1309
and exitstatus != EX_OK)){
982
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1310
983
/* Fallback if all plugins failed, none are found or an error
1313
986
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1314
987
char *passwordbuffer = getpass("Password: ");
1315
size_t len = strlen(passwordbuffer);
1316
/* Strip trailing newline */
1317
if(len > 0 and passwordbuffer[len-1] == '\n'){
1318
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1321
bret = print_out_password(passwordbuffer, len);
988
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1323
error(0, errno, "print_out_password");
1324
exitstatus = EX_IOERR;
990
perror("print_out_password");
991
exitstatus = EXIT_FAILURE;
1328
995
/* Restore old signal handler */
1329
996
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1331
error(0, errno, "sigaction");
1332
exitstatus = EX_OSERR;
999
exitstatus = EXIT_FAILURE;
1335
1002
if(custom_argv != NULL){
1336
1003
for(char **arg = custom_argv+1; *arg != NULL; arg++){