18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
30
#include <stdbool.h> /* bool, true, false */
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(),
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(),
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(),
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
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(),
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()
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
89
97
size_t buffer_size;
90
98
size_t buffer_length;
92
volatile bool completed;
100
volatile sig_atomic_t completed;
94
102
struct plugin *next;
97
105
static plugin *plugin_list = NULL;
99
/* Gets a existing plugin based on name,
107
/* Gets an existing plugin based on name,
100
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
101
110
static plugin *getplugin(char *name){
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))){
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))){
109
118
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
114
126
char *copy_name = NULL;
115
127
if(name != NULL){
116
copy_name = strdup(name);
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
117
131
if(copy_name == 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){
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){
130
150
free(new_plugin);
133
154
new_plugin->argv[0] = copy_name;
134
155
new_plugin->argv[1] = NULL;
136
new_plugin->environ = malloc(sizeof(char *));
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
160
if(new_plugin->environ == NULL){
139
163
free(new_plugin->argv);
140
164
free(new_plugin);
143
168
new_plugin->environ[0] = NULL;
145
170
/* Append the new plugin to the list */
146
171
plugin_list = new_plugin;
147
172
return new_plugin;
150
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
151
177
static bool add_to_char_array(const char *new, char ***array,
153
179
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
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);
156
185
/* Malloc check */
186
if(new_array == NULL){
160
190
/* Make a copy of the new string */
161
char *copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
162
195
if(copy == NULL){
181
215
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
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);
186
241
return add_to_char_array(def, &(p->environ), &(p->envc));
190
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
191
247
* Descriptor Flags".
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
194
static int set_cloexec_flag(int fd)
196
int ret = fcntl(fd, F_GETFD, 0);
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));
197
253
/* If reading the flags failed, return error indication now. */
201
257
/* Store modified flag word in the descriptor. */
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
261
#endif /* not O_CLOEXEC */
206
264
/* Mark processes as completed when they exit, and save their exit
208
void handle_sigchld(__attribute__((unused)) int sig){
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
210
269
plugin *proc = plugin_list;
327
387
{ .name = "global-options", .key = 'g',
328
388
.arg = "OPTION[,OPTION[,...]]",
329
389
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
390
{ .name = "global-env", .key = 'G',
331
391
.arg = "VAR=value",
332
392
.doc = "Environment variable passed to all plugins" },
333
393
{ .name = "options-for", .key = 'o',
334
394
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
395
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
396
{ .name = "env-for", .key = 'E',
337
397
.arg = "PLUGIN:ENV=value",
338
398
.doc = "Environment variable passed to specified plugin" },
339
399
{ .name = "disable", .key = 'd',
341
401
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
404
.doc = "Enable a specific plugin", .group = 1 },
342
405
{ .name = "plugin-dir", .key = 128,
343
406
.arg = "DIRECTORY",
344
407
.doc = "Specify a different plugin directory", .group = 2 },
353
416
.doc = "Group ID the plugins will run as", .group = 3 },
354
417
{ .name = "debug", .key = 132,
355
418
.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 },
359
error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {
360
/* Get the INPUT argument from `argp_parse', which we know is a
361
pointer to our plugin list pointer. */
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
363
441
case 'g': /* --global-options */
366
while((p = strsep(&arg, ",")) != NULL){
370
if(not add_argument(getplugin(NULL), p)){
371
perror("add_argument");
372
return ARGP_ERR_UNKNOWN;
377
case 'e': /* --global-envs */
382
char *envdef = strdup(arg);
386
if(not add_environment(getplugin(NULL), envdef)){
387
perror("add_environment");
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)){
391
457
case 'o': /* --options-for */
393
char *p_name = strsep(&arg, ":");
394
if(p_name[0] == '\0'){
397
char *opt = strsep(&arg, ":");
403
while((p = strsep(&opt, ",")) != NULL){
407
if(not add_argument(getplugin(p_name), p)){
408
perror("add_argument");
409
return ARGP_ERR_UNKNOWN;
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)){
415
case 'f': /* --envs-for */
481
case 'E': /* --env-for */
420
483
char *envdef = strchr(arg, ':');
421
484
if(envdef == NULL){
424
char *p_name = strndup(arg, (size_t) (envdef-arg));
485
argp_error(state, "No colon in \"%s\"", arg);
429
if(not add_environment(getplugin(p_name), envdef)){
430
perror("add_environment");
492
argp_error(state, "Empty plugin name");
496
if(add_environment(getplugin(arg), envdef, true)){
434
501
case 'd': /* --disable */
436
plugin *p = getplugin(arg);
438
return ARGP_ERR_UNKNOWN;
503
plugin *p = getplugin(arg);
510
case 'e': /* --enable */
512
plugin *p = getplugin(arg);
443
519
case 128: /* --plugin-dir */
444
521
plugindir = strdup(arg);
445
if(plugindir == NULL){
449
case 129: /* --config-file */
522
if(plugindir != NULL){
526
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
529
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);
540
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);
551
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 */
450
609
argfile = strdup(arg);
455
614
case 130: /* --userid */
456
uid = (uid_t)strtol(arg, NULL, 10);
458
615
case 131: /* --groupid */
459
gid = (gid_t)strtol(arg, NULL, 10);
461
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
464
621
case ARGP_KEY_ARG:
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
470
624
return ARGP_ERR_UNKNOWN;
475
struct argp argp = { .options = options, .parser = parse_opt,
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
477
632
.doc = "Mandos plugin runner -- Run plugins" };
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
480
if (ret == ARGP_ERR_UNKNOWN){
481
fprintf(stderr, "Unknown error while parsing arguments\n");
482
exitstatus = EXIT_FAILURE;
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;
486
/* Opens the configfile if aviable */
487
if (argfile == NULL){
653
/* Reset to the normal argument parser */
654
argp.parser = parse_opt;
656
/* Open the configfile if available */
488
658
conffp = fopen(AFILE, "r");
490
660
conffp = fopen(argfile, "r");
492
662
if(conffp != NULL){
493
663
char *org_line = NULL;
494
664
char *p, *arg, *new_arg, *line;
497
666
const char whitespace_delims[] = " \r\t\f\v\n";
498
667
const char comment_delim[] = "#";
501
670
custom_argv = malloc(sizeof(char*) * 2);
502
671
if(custom_argv == NULL){
504
exitstatus = EXIT_FAILURE;
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
507
676
custom_argv[0] = argv[0];
508
677
custom_argv[1] = NULL;
510
/* for each line in the config file, strip whitespace and ignore commented text */
679
/* for each line in the config file, strip whitespace and ignore
512
682
sret = getline(&org_line, &size, conffp);
518
688
arg = strsep(&line, comment_delim);
519
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
523
693
new_arg = strdup(p);
524
694
if(new_arg == NULL){
526
exitstatus = EXIT_FAILURE;
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
531
701
custom_argc += 1;
532
custom_argv = realloc(custom_argv, sizeof(char *)
533
* ((unsigned int) custom_argc + 1));
534
if(custom_argv == NULL){
536
exitstatus = EXIT_FAILURE;
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;
540
716
custom_argv[custom_argc-1] = new_arg;
541
custom_argv[custom_argc] = NULL;
717
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;
546
730
/* Check for harmful errors and go to fallback. Other errors might
547
731
not affect opening plugins */
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
550
exitstatus = EXIT_FAILURE;
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
554
/* If there was any arguments from configuration file,
555
pass them to parser as command arguments */
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
556
740
if(custom_argv != NULL){
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
558
if (ret == ARGP_ERR_UNKNOWN){
559
fprintf(stderr, "Unknown error while parsing arguments\n");
560
exitstatus = EXIT_FAILURE;
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);
569
800
for(char **a = p->argv; *a != NULL; a++){
570
801
fprintf(stderr, "\tArg: %s\n", *a);
572
fprintf(stderr, "...and %u environment variables\n", p->envc);
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
573
804
for(char **a = p->environ; *a != NULL; a++){
574
805
fprintf(stderr, "\t%s\n", *a);
579
/* Strip permissions down to nobody */
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");
834
/* Lower permissions */
837
error(0, errno, "setgid");
580
839
ret = setuid(uid);
589
if (plugindir == NULL){
592
dir = opendir(plugindir);
596
perror("Could not open plugin dir");
597
exitstatus = EXIT_FAILURE;
601
/* Set the FD_CLOEXEC flag on the directory, if possible */
841
error(0, errno, "setuid");
844
/* Open plugin directory with close_on_exec flag */
603
int dir_fd = dirfd(dir);
605
ret = set_cloexec_flag(dir_fd);
607
perror("set_cloexec_flag");
608
exitstatus = EXIT_FAILURE;
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);
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;
614
914
FD_ZERO(&rfds_all);
616
916
/* Read and execute any executable in the plugin directory*/
618
dirst = readdir(dir);
620
// All directory entries have been processed
624
exitstatus = EXIT_FAILURE;
630
d_name_len = strlen(dirst->d_name);
632
// Ignore dotfiles, backup files and other junk
634
bool bad_name = false;
636
const char const *bad_prefixes[] = { ".", "#", NULL };
638
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
640
".dpkg-divert", NULL };
641
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
642
size_t pre_len = strlen(*pre);
643
if((d_name_len >= pre_len)
644
and strncmp((dirst->d_name), *pre, pre_len) == 0){
646
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
647
" with bad prefix %s\n", dirst->d_name, *pre);
656
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
657
size_t suf_len = strlen(*suf);
658
if((d_name_len >= suf_len)
659
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
662
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
663
" with bad suffix %s\n", dirst->d_name, *suf);
676
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
682
ret = stat(filename, &st);
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");
689
933
/* Ignore non-executable files */
690
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
934
if(not S_ISREG(st.st_mode)
935
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
692
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
693
" with bad type or mode\n", filename);
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);
699
plugin *p = getplugin(dirst->d_name);
948
plugin *p = getplugin(direntries[i]->d_name);
950
error(0, errno, "getplugin");
707
957
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
958
direntries[i]->d_name);
717
968
for(char **a = g->argv + 1; *a != NULL; a++){
718
969
if(not add_argument(p, *a)){
719
perror("add_argument");
970
error(0, errno, "add_argument");
722
973
/* Add global environment variables */
723
974
for(char **e = g->environ; *e != NULL; e++){
724
if(not add_environment(p, *e)){
725
perror("add_environment");
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
730
/* If this plugin has any environment variables, we will call
731
using execve and need to duplicate the environment from this
981
/* If this plugin has any environment variables, we need to
982
duplicate the environment from this process, too. */
733
983
if(p->environ[0] != NULL){
734
984
for(char **e = environ; *e != NULL; e++){
735
char *copy = strdup(*e);
740
if(not add_environment(p, copy)){
741
perror("add_environment");
985
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
750
exitstatus = EXIT_FAILURE;
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],
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
753
1013
/* Ask OS to automatic close the pipe on exec */
754
1014
ret = set_cloexec_flag(pipefd[0]);
756
perror("set_cloexec_flag");
757
exitstatus = EXIT_FAILURE;
1016
error(0, errno, "set_cloexec_flag");
1019
exitstatus = EX_OSERR;
1020
free(direntries[i]);
760
1023
ret = set_cloexec_flag(pipefd[1]);
762
perror("set_cloexec_flag");
763
exitstatus = EXIT_FAILURE;
1025
error(0, errno, "set_cloexec_flag");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
1032
#endif /* not O_CLOEXEC */
766
1033
/* Block SIGCHLD until process is safely in process list */
767
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1035
&sigchld_action.sa_mask,
769
perror("sigprocmask");
770
exitstatus = EXIT_FAILURE;
1038
error(0, errno, "sigprocmask");
1039
exitstatus = EX_OSERR;
1040
free(direntries[i]);
773
// Starting a new process to be watched
1043
/* Starting a new process to be watched */
1047
} while(pid == -1 and errno == EINTR);
777
exitstatus = EXIT_FAILURE;
1049
error(0, errno, "fork");
1050
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL));
1054
exitstatus = EX_OSERR;
1055
free(direntries[i]);
781
1059
/* this is the child process */
782
1060
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1062
error(0, errno, "sigaction");
787
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
789
perror("sigprocmask");
1067
error(0, errno, "sigprocmask");
793
1071
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1073
error(0, errno, "dup2");
800
/* If dir has no file descriptor, we could not set FD_CLOEXEC
801
above and must now close it manually here. */
804
if(p->environ[0] == NULL){
805
if(execv(filename, p->argv) < 0){
810
if(execve(filename, p->argv, p->environ) < 0){
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);
817
1086
/* Parent process */
818
1087
close(pipefd[1]); /* Close unused write end of pipe */
820
plugin *new_plugin = getplugin(dirst->d_name);
821
if (new_plugin == NULL){
823
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1089
plugin *new_plugin = getplugin(direntries[i]->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,
825
perror("sigprocmask");
1096
error(0, errno, "sigprocmask");
827
exitstatus = EXIT_FAILURE;
1098
exitstatus = EX_OSERR;
1099
free(direntries[i]);
1102
free(direntries[i]);
831
1104
new_plugin->pid = pid;
832
1105
new_plugin->fd = pipefd[0];
834
1107
/* Unblock SIGCHLD so signal handler can be run if this process
835
1108
has already completed */
836
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1110
&sigchld_action.sa_mask,
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1113
error(0, errno, "sigprocmask");
1114
exitstatus = EX_OSERR;
843
FD_SET(new_plugin->fd, &rfds_all);
1118
#if defined (__GNUC__) and defined (__GLIBC__)
1119
#if not __GLIBC_PREREQ(2, 16)
1120
#pragma GCC diagnostic push
1121
#pragma GCC diagnostic ignored "-Wsign-conversion"
1124
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1125
-Wconversion in GNU libc
1127
#if defined (__GNUC__) and defined (__GLIBC__)
1128
#if not __GLIBC_PREREQ(2, 16)
1129
#pragma GCC diagnostic pop
845
if (maxfd < new_plugin->fd){
1133
if(maxfd < new_plugin->fd){
846
1134
maxfd = new_plugin->fd;
1142
free_plugin(getplugin(NULL));
854
1144
for(plugin *p = plugin_list; p != NULL; p = p->next){
855
1145
if(p->pid != 0){
861
1151
free_plugin_list();
865
1155
/* Main loop while running plugins exist */
866
1156
while(plugin_list){
867
1157
fd_set rfds = rfds_all;
868
1158
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
869
if (select_ret == -1){
871
exitstatus = EXIT_FAILURE;
1159
if(select_ret == -1 and errno != EINTR){
1160
error(0, errno, "select");
1161
exitstatus = EX_OSERR;
874
1164
/* OK, now either a process completed, or something can be read
875
1165
from one of them */
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1166
for(plugin *proc = plugin_list; proc != NULL;){
877
1167
/* Is this process completely done? */
878
if(proc->eof and proc->completed){
1168
if(proc->completed and proc->eof){
879
1169
/* Only accept the plugin output if it exited cleanly */
880
1170
if(not WIFEXITED(proc->status)
881
1171
or WEXITSTATUS(proc->status) != 0){
882
1172
/* Bad exit by plugin */
885
1175
if(WIFEXITED(proc->status)){
886
fprintf(stderr, "Plugin %u exited with status %d\n",
887
(unsigned int) (proc->pid),
1176
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1177
" status %d\n", proc->name,
1178
(intmax_t) (proc->pid),
888
1179
WEXITSTATUS(proc->status));
889
} else if(WIFSIGNALED(proc->status)) {
890
fprintf(stderr, "Plugin %u killed by signal %d\n",
891
(unsigned int) (proc->pid),
892
WTERMSIG(proc->status));
1180
} else if(WIFSIGNALED(proc->status)){
1181
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1182
" signal %d: %s\n", proc->name,
1183
(intmax_t) (proc->pid),
1184
WTERMSIG(proc->status),
1185
strsignal(WTERMSIG(proc->status)));
893
1186
} else if(WCOREDUMP(proc->status)){
894
fprintf(stderr, "Plugin %d dumped core\n",
895
(unsigned int) (proc->pid));
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1188
" core\n", proc->name, (intmax_t) (proc->pid));
899
1192
/* Remove the plugin */
900
FD_CLR(proc->fd, &rfds_all);
1193
#if defined (__GNUC__) and defined (__GLIBC__)
1194
#if not __GLIBC_PREREQ(2, 16)
1195
#pragma GCC diagnostic push
1196
#pragma GCC diagnostic ignored "-Wsign-conversion"
1199
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1200
-Wconversion in GNU libc
1202
#if defined (__GNUC__) and defined (__GLIBC__)
1203
#if not __GLIBC_PREREQ(2, 16)
1204
#pragma GCC diagnostic pop
902
1208
/* Block signal while modifying process_list */
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1209
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1211
&sigchld_action.sa_mask,
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1214
error(0, errno, "sigprocmask");
1215
exitstatus = EX_OSERR;
1219
plugin *next_plugin = proc->next;
909
1220
free_plugin(proc);
910
1223
/* We are done modifying process list, so unblock signal */
911
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1224
ret = (int)(TEMP_FAILURE_RETRY
1225
(sigprocmask(SIG_UNBLOCK,
1226
&sigchld_action.sa_mask, NULL)));
914
perror("sigprocmask");
915
exitstatus = EXIT_FAILURE;
1228
error(0, errno, "sigprocmask");
1229
exitstatus = EX_OSERR;
919
1233
if(plugin_list == NULL){
925
1240
/* This process exited nicely, so print its buffer */
927
1242
bool bret = print_out_password(proc->buffer,
928
1243
proc->buffer_length);
930
perror("print_out_password");
931
exitstatus = EXIT_FAILURE;
1245
error(0, errno, "print_out_password");
1246
exitstatus = EX_IOERR;
936
1251
/* This process has not completed. Does it have any output? */
937
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1252
#if defined (__GNUC__) and defined (__GLIBC__)
1253
#if not __GLIBC_PREREQ(2, 16)
1254
#pragma GCC diagnostic push
1255
#pragma GCC diagnostic ignored "-Wsign-conversion"
1258
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1264
#if defined (__GNUC__) and defined (__GLIBC__)
1265
#if not __GLIBC_PREREQ(2, 16)
1266
#pragma GCC diagnostic pop
938
1269
/* This process had nothing to say at this time */
941
1273
/* Before reading, make the process' data buffer large enough */
942
1274
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
943
proc->buffer = realloc(proc->buffer, proc->buffer_size
944
+ (size_t) BUFFER_SIZE);
945
if (proc->buffer == NULL){
947
exitstatus = EXIT_FAILURE;
1275
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1276
+ (size_t) BUFFER_SIZE);
1277
if(new_buffer == NULL){
1278
error(0, errno, "malloc");
1279
exitstatus = EX_OSERR;
1282
proc->buffer = new_buffer;
950
1283
proc->buffer_size += BUFFER_SIZE;
952
1285
/* Read from the process */
953
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1286
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1288
+ proc->buffer_length,
956
1291
/* Read error from this process; ignore the error */
961
1297
proc->eof = true;
963
proc->buffer_length += (size_t) ret;
1299
proc->buffer_length += (size_t) sret;
971
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1307
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1308
and exitstatus != EX_OK)){
972
1309
/* Fallback if all plugins failed, none are found or an error
975
1312
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
976
1313
char *passwordbuffer = getpass("Password: ");
977
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1314
size_t len = strlen(passwordbuffer);
1315
/* Strip trailing newline */
1316
if(len > 0 and passwordbuffer[len-1] == '\n'){
1317
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1320
bret = print_out_password(passwordbuffer, len);
979
perror("print_out_password");
980
exitstatus = EXIT_FAILURE;
1322
error(0, errno, "print_out_password");
1323
exitstatus = EX_IOERR;
984
1327
/* Restore old signal handler */
985
1328
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
988
exitstatus = EXIT_FAILURE;
1330
error(0, errno, "sigaction");
1331
exitstatus = EX_OSERR;
991
1334
if(custom_argv != NULL){
992
1335
for(char **arg = custom_argv+1; *arg != NULL; arg++){