18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
22
* Contact the authors at <mandos@recompile.se>.
25
#define _FORTIFY_SOURCE 2
27
#include <stdio.h> /* popen, fileno */
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
30
WIFEXITED, WEXITSTATUS, wait */
31
#include <sys/wait.h> /* wait */
32
#include <dirent.h> /* DIR, opendir */
33
#include <sys/stat.h> /* stat, struct stat */
34
#include <unistd.h> /* stat, struct stat, chdir */
35
#include <stdlib.h> /* EXIT_FAILURE */
36
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
38
#include <string.h> /* strlen, strcpy, strcat */
39
#include <stdbool.h> /* true */
40
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
41
#include <errno.h> /* errno */
45
typedef struct process{
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
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
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG(),
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
#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()
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
57
#include <errno.h> /* errno */
58
#include <argp.h> /* struct argp_option, struct
59
argp_state, struct argp,
60
argp_parse(), ARGP_ERR_UNKNOWN,
61
ARGP_KEY_END, ARGP_KEY_ARG,
63
#include <signal.h> /* struct sigaction, sigemptyset(),
64
sigaddset(), sigaction(),
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
76
#define BUFFER_SIZE 256
78
#define PDIR "/lib/mandos/plugins.d"
79
#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*/
49
96
size_t buffer_size;
50
97
size_t buffer_length;
54
#define BUFFER_SIZE 256
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){
113
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){
153
new_plugin->argv[0] = copy_name;
154
new_plugin->argv[1] = NULL;
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
159
if(new_plugin->environ == NULL){
162
free(new_plugin->argv);
167
new_plugin->environ[0] = NULL;
169
/* Append the new plugin to the list */
170
plugin_list = new_plugin;
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
static bool add_to_char_array(const char *new, char ***array,
178
/* 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);
197
/* Insert the copy */
198
(*array)[*len] = copy;
200
/* Add a new terminating NULL pointer to the last element */
201
(*array)[*len] = NULL;
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
static bool add_argument(plugin *p, const char *arg){
211
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){
220
/* 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));
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
252
/* If reading the flags failed, return error indication now. */
256
/* Store modified flag word in the descriptor. */
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
260
#endif /* not O_CLOEXEC */
263
/* Mark processes as completed when they exit, and save their exit
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
268
plugin *proc = plugin_list;
270
pid_t pid = waitpid(-1, &status, WNOHANG);
272
/* Only still running child processes */
277
/* No child processes */
280
error(0, errno, "waitpid");
283
/* A child exited, find it in process_list */
284
while(proc != NULL and proc->pid != pid){
288
/* Process not found in process list */
291
proc->status = status;
297
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
static bool print_out_password(const char *buffer, size_t length){
301
for(size_t written = 0; written < length; written += (size_t)ret){
302
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
static void free_plugin(plugin *plugin_node){
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
318
free(plugin_node->argv);
319
for(char **env = plugin_node->environ; *env != NULL; env++){
322
free(plugin_node->environ);
323
free(plugin_node->buffer);
325
/* Removes the plugin from the singly-linked list */
326
if(plugin_node == plugin_list){
327
/* First one - simple */
328
plugin_list = plugin_list->next;
330
/* Second one or later */
331
for(plugin *p = plugin_list; p != NULL; p = p->next){
332
if(p->next == plugin_node){
333
p->next = plugin_node->next;
342
static void free_plugin_list(void){
343
while(plugin_list != NULL){
344
free_plugin(plugin_list);
56
348
int main(int argc, char *argv[]){
57
char plugindir[] = "plugins.d";
58
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
349
char *plugindir = NULL;
350
char *argfile = NULL;
352
struct dirent **direntries = NULL;
63
355
int ret, maxfd = 0;
64
process *process_list = NULL;
66
dir = opendir(plugindir);
69
fprintf(stderr, "Can not open directory\n");
78
// All directory entries have been processed
83
d_name_len = strlen(dirst->d_name);
85
// Ignore dotfiles and backup files
86
if (dirst->d_name[0] == '.'
87
or dirst->d_name[d_name_len - 1] == '~'){
91
char *filename = malloc(d_name_len + plugindir_len + 2);
92
strcpy(filename, plugindir);
93
strcat(filename, "/");
94
strcat(filename, dirst->d_name);
98
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
99
// Starting a new process to be watched
100
process *new_process = malloc(sizeof(process));
103
new_process->pid = fork();
104
if(new_process->pid == 0){
105
/* this is the child process */
107
close(pipefd[0]); /* close unused read end of pipe */
108
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
109
/* create a new modified argument list */
110
char **new_argv = malloc(sizeof(char *)
111
* ((unsigned int) argc + 1));
112
new_argv[0] = filename;
113
for(int i = 1; i < argc; i++){
114
new_argv[i] = argv[i];
116
new_argv[argc] = NULL;
117
if(execv(filename, new_argv) < 0){
124
close(pipefd[1]); /* close unused write end of pipe */
125
new_process->fd = pipefd[0];
126
new_process->buffer = malloc(BUFFER_SIZE);
127
if (new_process->buffer == NULL){
131
new_process->buffer_size = BUFFER_SIZE;
132
new_process->buffer_length = 0;
133
FD_SET(new_process->fd, &rfds_orig);
135
if (maxfd < new_process->fd){
136
maxfd = new_process->fd;
140
new_process->next = process_list;
141
process_list = new_process;
147
if (process_list != NULL){
360
int exitstatus = EXIT_SUCCESS;
361
struct sigaction old_sigchld_action;
362
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
363
.sa_flags = SA_NOCLDSTOP };
364
char **custom_argv = NULL;
368
/* Establish a signal handler */
369
sigemptyset(&sigchld_action.sa_mask);
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
383
/* The options we understand. */
384
struct argp_option options[] = {
385
{ .name = "global-options", .key = 'g',
386
.arg = "OPTION[,OPTION[,...]]",
387
.doc = "Options passed to all plugins" },
388
{ .name = "global-env", .key = 'G',
390
.doc = "Environment variable passed to all plugins" },
391
{ .name = "options-for", .key = 'o',
392
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
393
.doc = "Options passed only to specified plugin" },
394
{ .name = "env-for", .key = 'E',
395
.arg = "PLUGIN:ENV=value",
396
.doc = "Environment variable passed to specified plugin" },
397
{ .name = "disable", .key = 'd',
399
.doc = "Disable a specific plugin", .group = 1 },
400
{ .name = "enable", .key = 'e',
402
.doc = "Enable a specific plugin", .group = 1 },
403
{ .name = "plugin-dir", .key = 128,
405
.doc = "Specify a different plugin directory", .group = 2 },
406
{ .name = "config-file", .key = 129,
408
.doc = "Specify a different configuration file", .group = 2 },
409
{ .name = "userid", .key = 130,
410
.arg = "ID", .flags = 0,
411
.doc = "User ID the plugins will run as", .group = 3 },
412
{ .name = "groupid", .key = 131,
413
.arg = "ID", .flags = 0,
414
.doc = "Group ID the plugins will run as", .group = 3 },
415
{ .name = "debug", .key = 132,
416
.doc = "Debug mode", .group = 4 },
418
* These reproduce what we would get without ARGP_NO_HELP
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
435
case 'g': /* --global-options */
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
446
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
451
case 'o': /* --options-for */
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
462
argp_error(state, "Empty plugin name");
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
475
case 'E': /* --env-for */
477
char *envdef = strchr(arg, ':');
479
argp_error(state, "No colon in \"%s\"", arg);
486
argp_error(state, "Empty plugin name");
490
if(add_environment(getplugin(arg), envdef, true)){
495
case 'd': /* --disable */
497
plugin *p = getplugin(arg);
504
case 'e': /* --enable */
506
plugin *p = getplugin(arg);
513
case 128: /* --plugin-dir */
515
plugindir = strdup(arg);
516
if(plugindir != NULL){
520
case 129: /* --config-file */
521
/* This is already done by parse_opt_config_file() */
523
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
534
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
545
case 132: /* --debug */
549
* These reproduce what we would get without ARGP_NO_HELP
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
574
return ARGP_ERR_UNKNOWN;
576
return errno; /* Set to 0 at start */
579
/* This option parser is the same as parse_opt() above, except it
580
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
586
case 'g': /* --global-options */
587
case 'G': /* --global-env */
588
case 'o': /* --options-for */
589
case 'E': /* --env-for */
590
case 'd': /* --disable */
591
case 'e': /* --enable */
592
case 128: /* --plugin-dir */
594
case 129: /* --config-file */
596
argfile = strdup(arg);
601
case 130: /* --userid */
602
case 131: /* --groupid */
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
610
return ARGP_ERR_UNKNOWN;
615
struct argp argp = { .options = options,
616
.parser = parse_opt_config_file,
618
.doc = "Mandos plugin runner -- Run plugins" };
620
/* Parse using parse_opt_config_file() in order to get the custom
621
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
635
exitstatus = EX_USAGE;
639
/* Reset to the normal argument parser */
640
argp.parser = parse_opt;
642
/* Open the configfile if available */
644
conffp = fopen(AFILE, "r");
646
conffp = fopen(argfile, "r");
649
char *org_line = NULL;
650
char *p, *arg, *new_arg, *line;
652
const char whitespace_delims[] = " \r\t\f\v\n";
653
const char comment_delim[] = "#";
656
custom_argv = malloc(sizeof(char*) * 2);
657
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
662
custom_argv[0] = argv[0];
663
custom_argv[1] = NULL;
665
/* for each line in the config file, strip whitespace and ignore
149
fd_set rfds = rfds_orig;
150
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
151
if (select_ret == -1){
155
for(process *process_itr = process_list; process_itr != NULL;
156
process_itr = process_itr->next){
157
if(FD_ISSET(process_itr->fd, &rfds)){
158
if(process_itr->buffer_length + BUFFER_SIZE
159
> process_itr->buffer_size){
160
process_itr->buffer = realloc(process_itr->buffer,
161
process_itr->buffer_size
162
+ (size_t) BUFFER_SIZE);
163
if (process_itr->buffer == NULL){
167
process_itr->buffer_size += BUFFER_SIZE;
169
ret = read(process_itr->fd, process_itr->buffer
170
+ process_itr->buffer_length, BUFFER_SIZE);
172
/* Read error from this process; ignore it */
175
process_itr->buffer_length += (size_t) ret;
178
/* wait for process exit */
180
waitpid(process_itr->pid, &status, 0);
181
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
182
write(STDOUT_FILENO, process_itr->buffer,
183
process_itr->buffer_length);
186
FD_CLR(process_itr->fd, &rfds_orig);
196
for(process *process_itr = process_list; process_itr != NULL;
197
process_itr = process_itr->next){
198
close(process_itr->fd);
199
kill(process_itr->pid, SIGTERM);
200
free(process_itr->buffer);
668
sret = getline(&org_line, &size, conffp);
674
arg = strsep(&line, comment_delim);
675
while((p = strsep(&arg, whitespace_delims)) != NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
689
char **new_argv = realloc(custom_argv, sizeof(char *)
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
699
custom_argv = new_argv;
702
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
716
/* Check for harmful errors and go to fallback. Other errors might
717
not affect opening plugins */
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
726
if(custom_argv != NULL){
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
740
exitstatus = EX_CONFIG;
745
/* Parse actual command line arguments, to let them override the
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
760
exitstatus = EX_USAGE;
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
766
fprintf(stderr, "Plugin: %s has %d arguments\n",
767
p->name ? p->name : "Global", p->argc - 1);
768
for(char **a = p->argv; *a != NULL; a++){
769
fprintf(stderr, "\tArg: %s\n", *a);
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
772
for(char **a = p->environ; *a != NULL; a++){
773
fprintf(stderr, "\t%s\n", *a);
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
784
error(0, errno, "open(\"" PDIR "\")");
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
789
error(0, errno, "fstat");
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
794
error(0, errno, "fchown");
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
802
/* Lower permissions */
805
error(0, errno, "setgid");
809
error(0, errno, "setuid");
812
/* Open plugin directory with close_on_exec flag */
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
817
#else /* not O_CLOEXEC */
819
#endif /* not O_CLOEXEC */
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
831
error(0, errno, "set_cloexec_flag");
832
exitstatus = EX_OSERR;
835
#endif /* O_CLOEXEC */
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
849
#pragma GCC diagnostic pop
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
878
exitstatus = EX_OSERR;
884
/* Read and execute any executable in the plugin directory*/
885
for(int i = 0; i < numplugins; i++){
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
889
error(0, errno, "Could not open plugin");
892
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
894
error(0, errno, "stat");
895
TEMP_FAILURE_RETRY(close(plugin_fd));
899
/* Ignore non-executable files */
900
if(not S_ISREG(st.st_mode)
901
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
904
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
905
" with bad type or mode\n",
906
plugindir != NULL ? plugindir : PDIR,
907
direntries[i]->d_name);
909
TEMP_FAILURE_RETRY(close(plugin_fd));
913
plugin *p = getplugin(direntries[i]->d_name);
915
error(0, errno, "getplugin");
916
TEMP_FAILURE_RETRY(close(plugin_fd));
921
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
922
direntries[i]->d_name);
924
TEMP_FAILURE_RETRY(close(plugin_fd));
928
/* Add global arguments to argument list for this plugin */
929
plugin *g = getplugin(NULL);
931
for(char **a = g->argv + 1; *a != NULL; a++){
932
if(not add_argument(p, *a)){
933
error(0, errno, "add_argument");
936
/* Add global environment variables */
937
for(char **e = g->environ; *e != NULL; e++){
938
if(not add_environment(p, *e, false)){
939
error(0, errno, "add_environment");
944
/* If this plugin has any environment variables, we need to
945
duplicate the environment from this process, too. */
946
if(p->environ[0] != NULL){
947
for(char **e = environ; *e != NULL; e++){
948
if(not add_environment(p, *e, false)){
949
error(0, errno, "add_environment");
956
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
957
#else /* O_CLOEXEC */
958
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
959
#endif /* O_CLOEXEC */
961
error(0, errno, "pipe");
962
exitstatus = EX_OSERR;
965
if(pipefd[0] >= FD_SETSIZE){
966
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
968
TEMP_FAILURE_RETRY(close(pipefd[0]));
969
TEMP_FAILURE_RETRY(close(pipefd[1]));
970
exitstatus = EX_OSERR;
974
/* Ask OS to automatic close the pipe on exec */
975
ret = set_cloexec_flag(pipefd[0]);
977
error(0, errno, "set_cloexec_flag");
978
TEMP_FAILURE_RETRY(close(pipefd[0]));
979
TEMP_FAILURE_RETRY(close(pipefd[1]));
980
exitstatus = EX_OSERR;
983
ret = set_cloexec_flag(pipefd[1]);
985
error(0, errno, "set_cloexec_flag");
986
TEMP_FAILURE_RETRY(close(pipefd[0]));
987
TEMP_FAILURE_RETRY(close(pipefd[1]));
988
exitstatus = EX_OSERR;
991
#endif /* not O_CLOEXEC */
992
/* Block SIGCHLD until process is safely in process list */
993
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
994
&sigchld_action.sa_mask,
997
error(0, errno, "sigprocmask");
998
exitstatus = EX_OSERR;
1001
/* Starting a new process to be watched */
1005
} while(pid == -1 and errno == EINTR);
1007
error(0, errno, "fork");
1008
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1009
&sigchld_action.sa_mask, NULL));
1010
TEMP_FAILURE_RETRY(close(pipefd[0]));
1011
TEMP_FAILURE_RETRY(close(pipefd[1]));
1012
exitstatus = EX_OSERR;
1016
/* this is the child process */
1017
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1019
error(0, errno, "sigaction");
1022
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1024
error(0, errno, "sigprocmask");
1028
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1030
error(0, errno, "dup2");
1034
if(fexecve(plugin_fd, p->argv,
1035
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1036
error(0, errno, "fexecve for %s/%s",
1037
plugindir != NULL ? plugindir : PDIR,
1038
direntries[i]->d_name);
1043
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1046
TEMP_FAILURE_RETRY(close(plugin_fd));
1047
plugin *new_plugin = getplugin(direntries[i]->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1054
error(0, errno, "sigprocmask");
1056
exitstatus = EX_OSERR;
1060
new_plugin->pid = pid;
1061
new_plugin->fd = pipefd[0];
1063
/* Unblock SIGCHLD so signal handler can be run if this process
1064
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
1074
#if defined (__GNUC__) and defined (__GLIBC__)
1075
#if not __GLIBC_PREREQ(2, 16)
1076
#pragma GCC diagnostic push
1077
#pragma GCC diagnostic ignored "-Wsign-conversion"
1080
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1081
-Wconversion in GNU libc
1083
#if defined (__GNUC__) and defined (__GLIBC__)
1084
#if not __GLIBC_PREREQ(2, 16)
1085
#pragma GCC diagnostic pop
1089
if(maxfd < new_plugin->fd){
1090
maxfd = new_plugin->fd;
1096
TEMP_FAILURE_RETRY(close(dir_fd));
1098
free_plugin(getplugin(NULL));
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1104
if(p->next == NULL){
1105
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1111
/* Main loop while running plugins exist */
1113
fd_set rfds = rfds_all;
1114
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1115
if(select_ret == -1 and errno != EINTR){
1116
error(0, errno, "select");
1117
exitstatus = EX_OSERR;
1120
/* OK, now either a process completed, or something can be read
1122
for(plugin *proc = plugin_list; proc != NULL;){
1123
/* Is this process completely done? */
1124
if(proc->completed and proc->eof){
1125
/* Only accept the plugin output if it exited cleanly */
1126
if(not WIFEXITED(proc->status)
1127
or WEXITSTATUS(proc->status) != 0){
1128
/* Bad exit by plugin */
1131
if(WIFEXITED(proc->status)){
1132
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1133
" status %d\n", proc->name,
1134
(intmax_t) (proc->pid),
1135
WEXITSTATUS(proc->status));
1136
} else if(WIFSIGNALED(proc->status)){
1137
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1138
" signal %d: %s\n", proc->name,
1139
(intmax_t) (proc->pid),
1140
WTERMSIG(proc->status),
1141
strsignal(WTERMSIG(proc->status)));
1142
} else if(WCOREDUMP(proc->status)){
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1144
" core\n", proc->name, (intmax_t) (proc->pid));
1148
/* Remove the plugin */
1149
#if defined (__GNUC__) and defined (__GLIBC__)
1150
#if not __GLIBC_PREREQ(2, 16)
1151
#pragma GCC diagnostic push
1152
#pragma GCC diagnostic ignored "-Wsign-conversion"
1155
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1156
-Wconversion in GNU libc
1158
#if defined (__GNUC__) and defined (__GLIBC__)
1159
#if not __GLIBC_PREREQ(2, 16)
1160
#pragma GCC diagnostic pop
1164
/* Block signal while modifying process_list */
1165
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1167
&sigchld_action.sa_mask,
1170
error(0, errno, "sigprocmask");
1171
exitstatus = EX_OSERR;
1175
plugin *next_plugin = proc->next;
1179
/* We are done modifying process list, so unblock signal */
1180
ret = (int)(TEMP_FAILURE_RETRY
1181
(sigprocmask(SIG_UNBLOCK,
1182
&sigchld_action.sa_mask, NULL)));
1184
error(0, errno, "sigprocmask");
1185
exitstatus = EX_OSERR;
1189
if(plugin_list == NULL){
1196
/* This process exited nicely, so print its buffer */
1198
bool bret = print_out_password(proc->buffer,
1199
proc->buffer_length);
1201
error(0, errno, "print_out_password");
1202
exitstatus = EX_IOERR;
1207
/* This process has not completed. Does it have any output? */
1208
#if defined (__GNUC__) and defined (__GLIBC__)
1209
#if not __GLIBC_PREREQ(2, 16)
1210
#pragma GCC diagnostic push
1211
#pragma GCC diagnostic ignored "-Wsign-conversion"
1214
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1220
#if defined (__GNUC__) and defined (__GLIBC__)
1221
#if not __GLIBC_PREREQ(2, 16)
1222
#pragma GCC diagnostic pop
1225
/* This process had nothing to say at this time */
1229
/* Before reading, make the process' data buffer large enough */
1230
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1231
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1232
+ (size_t) BUFFER_SIZE);
1233
if(new_buffer == NULL){
1234
error(0, errno, "malloc");
1235
exitstatus = EX_OSERR;
1238
proc->buffer = new_buffer;
1239
proc->buffer_size += BUFFER_SIZE;
1241
/* Read from the process */
1242
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1244
+ proc->buffer_length,
1247
/* Read error from this process; ignore the error */
1255
proc->buffer_length += (size_t) sret;
1263
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1264
and exitstatus != EX_OK)){
1265
/* Fallback if all plugins failed, none are found or an error
1268
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1269
char *passwordbuffer = getpass("Password: ");
1270
size_t len = strlen(passwordbuffer);
1271
/* Strip trailing newline */
1272
if(len > 0 and passwordbuffer[len-1] == '\n'){
1273
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1276
bret = print_out_password(passwordbuffer, len);
1278
error(0, errno, "print_out_password");
1279
exitstatus = EX_IOERR;
1283
/* Restore old signal handler */
1284
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1286
error(0, errno, "sigaction");
1287
exitstatus = EX_OSERR;
1290
if(custom_argv != NULL){
1291
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1300
TEMP_FAILURE_RETRY(close(dir_fd));
1303
/* Kill the processes */
1304
for(plugin *p = plugin_list; p != NULL; p = p->next){
1307
ret = kill(p->pid, SIGTERM);
1308
if(ret == -1 and errno != ESRCH){
1309
/* Set-uid proccesses might not get closed */
1310
error(0, errno, "kill");
1315
/* Wait for any remaining child processes to terminate */
1319
if(errno != ECHILD){
1320
error(0, errno, "wait");