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
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
32
27
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
33
#include <sys/wait.h> /* wait() */
34
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
43
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
37
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
58
48
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
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
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
55
typedef struct process{
96
59
size_t buffer_size;
97
60
size_t buffer_length;
99
volatile sig_atomic_t completed;
67
typedef struct plugin{
68
char *name; /* can be NULL or any plugin name */
101
72
struct plugin *next;
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
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
or (p->name and name and (strcmp(p->name, name) == 0))){
75
plugin *getplugin(char *name, plugin **plugin_list){
76
for (plugin *p = *plugin_list; p != NULL; p = p->next){
78
or (p->name and name and (strcmp(p->name, name) == 0))){
116
82
/* Create a new plugin */
117
plugin *new_plugin = NULL;
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
124
char *copy_name = NULL;
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
129
if(copy_name == NULL){
137
*new_plugin = (plugin){ .name = copy_name,
140
.next = plugin_list };
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
152
new_plugin->argv[0] = copy_name;
83
plugin *new_plugin = malloc(sizeof(plugin));
84
if (new_plugin == NULL){
88
new_plugin->name = name;
89
new_plugin->argv = malloc(sizeof(char *) * 2);
90
if (new_plugin->argv == NULL){
94
new_plugin->argv[0] = name;
153
95
new_plugin->argv[1] = NULL;
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
158
if(new_plugin->environ == NULL){
161
free(new_plugin->argv);
166
new_plugin->environ[0] = NULL;
97
new_plugin->disabled = false;
98
new_plugin->next = *plugin_list;
168
99
/* Append the new plugin to the list */
169
plugin_list = new_plugin;
100
*plugin_list = new_plugin;
170
101
return new_plugin;
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
static bool add_to_char_array(const char *new, char ***array,
177
/* Resize the pointed-to array to hold one more pointer */
178
char **new_array = NULL;
180
new_array = realloc(*array, sizeof(char *)
181
* (size_t) ((*len) + 2));
182
} while(new_array == NULL and errno == EINTR);
184
if(new_array == NULL){
188
/* Make a copy of the new string */
192
} while(copy == NULL and errno == EINTR);
196
/* Insert the copy */
197
(*array)[*len] = copy;
199
/* Add a new terminating NULL pointer to the last element */
200
(*array)[*len] = NULL;
204
/* Add to a plugin's argument vector */
205
__attribute__((nonnull(2)))
206
static bool add_argument(plugin *p, const char *arg){
210
return add_to_char_array(arg, &(p->argv), &(p->argc));
213
/* Add to a plugin's environment */
214
__attribute__((nonnull(2)))
215
static bool add_environment(plugin *p, const char *def, bool replace){
219
/* namelen = length of name of environment variable */
220
size_t namelen = (size_t)(strchrnul(def, '=') - def);
221
/* Search for this environment variable */
222
for(char **envdef = p->environ; *envdef != NULL; envdef++){
223
if(strncmp(*envdef, def, namelen + 1) == 0){
224
/* It already exists */
228
new_envdef = realloc(*envdef, strlen(def) + 1);
229
} while(new_envdef == NULL and errno == EINTR);
230
if(new_envdef == NULL){
233
*envdef = new_envdef;
234
strcpy(*envdef, def);
239
return add_to_char_array(def, &(p->environ), &(p->envc));
104
void addargument(plugin *p, char *arg){
105
p->argv[p->argc] = arg;
106
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
107
if (p->argv == NULL){
112
p->argv[p->argc] = NULL;
243
116
* Based on the example in the GNU LibC manual chapter 13.13 "File
244
117
* Descriptor Flags".
245
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
118
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
static int set_cloexec_flag(int fd){
248
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
120
int set_cloexec_flag(int fd)
122
int ret = fcntl(fd, F_GETFD, 0);
249
123
/* If reading the flags failed, return error indication now. */
253
127
/* Store modified flag word in the descriptor. */
254
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
128
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
259
/* Mark processes as completed when they exit, and save their exit
131
#define BUFFER_SIZE 256
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
136
process *process_list = NULL;
138
/* Mark a process as completed when it exits, and save its exit
261
static void handle_sigchld(__attribute__((unused)) int sig){
262
int old_errno = errno;
264
plugin *proc = plugin_list;
266
pid_t pid = waitpid(-1, &status, WNOHANG);
268
/* Only still running child processes */
273
/* No child processes */
276
error(0, errno, "waitpid");
279
/* A child exited, find it in process_list */
280
while(proc != NULL and proc->pid != pid){
284
/* Process not found in process list */
287
proc->status = status;
293
/* Prints out a password to stdout */
294
__attribute__((nonnull))
295
static bool print_out_password(const char *buffer, size_t length){
297
for(size_t written = 0; written < length; written += (size_t)ret){
298
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
307
/* Removes and free a plugin from the plugin list */
308
__attribute__((nonnull))
309
static void free_plugin(plugin *plugin_node){
311
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
314
free(plugin_node->argv);
315
for(char **env = plugin_node->environ; *env != NULL; env++){
318
free(plugin_node->environ);
319
free(plugin_node->buffer);
321
/* Removes the plugin from the singly-linked list */
322
if(plugin_node == plugin_list){
323
/* First one - simple */
324
plugin_list = plugin_list->next;
326
/* Second one or later */
327
for(plugin *p = plugin_list; p != NULL; p = p->next){
328
if(p->next == plugin_node){
329
p->next = plugin_node->next;
338
static void free_plugin_list(void){
339
while(plugin_list != NULL){
340
free_plugin(plugin_list);
140
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
148
/* Process not found in process list */
151
proc->status = status;
152
proc->completed = true;
344
155
int main(int argc, char *argv[]){
345
char *plugindir = NULL;
346
char *argfile = NULL;
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
348
157
size_t d_name_len;
350
159
struct dirent *dirst;
353
162
int ret, maxfd = 0;
357
163
bool debug = false;
358
164
int exitstatus = EXIT_SUCCESS;
359
struct sigaction old_sigchld_action;
360
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
361
.sa_flags = SA_NOCLDSTOP };
362
char **custom_argv = NULL;
365
166
/* Establish a signal handler */
167
struct sigaction old_sigchld_action,
168
sigchld_action = { .sa_handler = handle_sigchld,
169
.sa_flags = SA_NOCLDSTOP };
366
170
sigemptyset(&sigchld_action.sa_mask);
367
171
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
369
error(0, errno, "sigaddset");
370
exitstatus = EX_OSERR;
373
176
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
375
error(0, errno, "sigaction");
376
exitstatus = EX_OSERR;
380
182
/* The options we understand. */
382
184
{ .name = "global-options", .key = 'g',
383
185
.arg = "OPTION[,OPTION[,...]]",
384
186
.doc = "Options passed to all plugins" },
385
{ .name = "global-env", .key = 'G',
387
.doc = "Environment variable passed to all plugins" },
388
187
{ .name = "options-for", .key = 'o',
389
188
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
390
189
.doc = "Options passed only to specified plugin" },
391
{ .name = "env-for", .key = 'E',
392
.arg = "PLUGIN:ENV=value",
393
.doc = "Environment variable passed to specified plugin" },
394
190
{ .name = "disable", .key = 'd',
396
192
.doc = "Disable a specific plugin", .group = 1 },
397
{ .name = "enable", .key = 'e',
399
.doc = "Enable a specific plugin", .group = 1 },
400
193
{ .name = "plugin-dir", .key = 128,
401
194
.arg = "DIRECTORY",
402
195
.doc = "Specify a different plugin directory", .group = 2 },
403
{ .name = "config-file", .key = 129,
405
.doc = "Specify a different configuration file", .group = 2 },
406
{ .name = "userid", .key = 130,
407
.arg = "ID", .flags = 0,
408
.doc = "User ID the plugins will run as", .group = 3 },
409
{ .name = "groupid", .key = 131,
410
.arg = "ID", .flags = 0,
411
.doc = "Group ID the plugins will run as", .group = 3 },
412
{ .name = "debug", .key = 132,
413
.doc = "Debug mode", .group = 4 },
415
* These reproduce what we would get without ARGP_NO_HELP
417
{ .name = "help", .key = '?',
418
.doc = "Give this help list", .group = -1 },
419
{ .name = "usage", .key = -3,
420
.doc = "Give a short usage message", .group = -1 },
421
{ .name = "version", .key = 'V',
422
.doc = "Print program version", .group = -1 },
196
{ .name = "debug", .key = 129,
197
.doc = "Debug mode", .group = 3 },
426
__attribute__((nonnull(3)))
427
error_t parse_opt(int key, char *arg, struct argp_state *state){
432
case 'g': /* --global-options */
435
while((plugin_option = strsep(&arg, ",")) != NULL){
436
if(not add_argument(getplugin(NULL), plugin_option)){
442
case 'G': /* --global-env */
443
add_environment(getplugin(NULL), arg, true);
445
case 'o': /* --options-for */
447
char *option_list = strchr(arg, ':');
448
if(option_list == NULL){
449
argp_error(state, "No colon in \"%s\"", arg);
456
argp_error(state, "Empty plugin name");
461
while((option = strsep(&option_list, ",")) != NULL){
462
if(not add_argument(getplugin(arg), option)){
468
case 'E': /* --env-for */
470
char *envdef = strchr(arg, ':');
472
argp_error(state, "No colon in \"%s\"", arg);
479
argp_error(state, "Empty plugin name");
483
add_environment(getplugin(arg), envdef, true);
486
case 'd': /* --disable */
488
plugin *p = getplugin(arg);
494
case 'e': /* --enable */
496
plugin *p = getplugin(arg);
502
case 128: /* --plugin-dir */
504
plugindir = strdup(arg);
506
case 129: /* --config-file */
507
/* This is already done by parse_opt_config_file() */
509
case 130: /* --userid */
510
tmp_id = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmp_id != (uid_t)tmp_id){
513
argp_error(state, "Bad user ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)uid);
519
case 131: /* --groupid */
520
tmp_id = strtoimax(arg, &tmp, 10);
521
if(errno != 0 or tmp == arg or *tmp != '\0'
522
or tmp_id != (gid_t)tmp_id){
523
argp_error(state, "Bad group ID number: \"%s\", using %"
524
PRIdMAX, arg, (intmax_t)gid);
529
case 132: /* --debug */
201
error_t parse_opt (int key, char *arg, struct argp_state *state) {
202
/* Get the INPUT argument from `argp_parse', which we know is a
203
pointer to our plugin list pointer. */
204
plugin **plugins = state->input;
208
char *p = strtok(arg, ",");
210
addargument(getplugin(NULL, plugins), p);
211
p = strtok(NULL, ",");
217
char *name = strtok(arg, ":");
218
char *p = strtok(NULL, ":");
222
addargument(getplugin(name, plugins), p);
223
p = strtok(NULL, ",");
230
getplugin(arg, plugins)->disabled = true;
533
* These reproduce what we would get without ARGP_NO_HELP
535
case '?': /* --help */
536
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
537
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
538
case -3: /* --usage */
539
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
540
argp_state_help(state, state->out_stream,
541
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
542
case 'V': /* --version */
543
fprintf(state->out_stream, "%s\n", argp_program_version);
547
* When adding more options before this line, remember to also add a
548
* "case" to the "parse_opt_config_file" function below.
551
/* Cryptsetup always passes an argument, which is an empty
552
string if "none" was specified in /etc/crypttab. So if
553
argument was empty, we ignore it silently. */
558
return ARGP_ERR_UNKNOWN;
560
return errno; /* Set to 0 at start */
563
/* This option parser is the same as parse_opt() above, except it
564
ignores everything but the --config-file option. */
565
error_t parse_opt_config_file(int key, char *arg,
566
__attribute__((unused))
567
struct argp_state *state){
570
case 'g': /* --global-options */
571
case 'G': /* --global-env */
572
case 'o': /* --options-for */
573
case 'E': /* --env-for */
574
case 'd': /* --disable */
575
case 'e': /* --enable */
576
case 128: /* --plugin-dir */
578
case 129: /* --config-file */
580
argfile = strdup(arg);
582
case 130: /* --userid */
583
case 131: /* --groupid */
584
case 132: /* --debug */
585
case '?': /* --help */
586
case -3: /* --usage */
587
case 'V': /* --version */
591
return ARGP_ERR_UNKNOWN;
596
struct argp argp = { .options = options,
597
.parser = parse_opt_config_file,
245
return ARGP_ERR_UNKNOWN;
250
plugin *plugin_list = NULL;
252
struct argp argp = { .options = options, .parser = parse_opt,
599
254
.doc = "Mandos plugin runner -- Run plugins" };
601
/* Parse using parse_opt_config_file() in order to get the custom
602
config file location, if any. */
603
ret = argp_parse(&argp, argc, argv,
604
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
612
error(0, errno, "argp_parse");
613
exitstatus = EX_OSERR;
616
exitstatus = EX_USAGE;
620
/* Reset to the normal argument parser */
621
argp.parser = parse_opt;
623
/* Open the configfile if available */
625
conffp = fopen(AFILE, "r");
627
conffp = fopen(argfile, "r");
630
char *org_line = NULL;
631
char *p, *arg, *new_arg, *line;
633
const char whitespace_delims[] = " \r\t\f\v\n";
634
const char comment_delim[] = "#";
637
custom_argv = malloc(sizeof(char*) * 2);
638
if(custom_argv == NULL){
639
error(0, errno, "malloc");
640
exitstatus = EX_OSERR;
643
custom_argv[0] = argv[0];
644
custom_argv[1] = NULL;
646
/* for each line in the config file, strip whitespace and ignore
649
sret = getline(&org_line, &size, conffp);
655
arg = strsep(&line, comment_delim);
656
while((p = strsep(&arg, whitespace_delims)) != NULL){
662
error(0, errno, "strdup");
663
exitstatus = EX_OSERR;
670
char **new_argv = realloc(custom_argv, sizeof(char *)
673
if(new_argv == NULL){
674
error(0, errno, "realloc");
675
exitstatus = EX_OSERR;
680
custom_argv = new_argv;
683
custom_argv[custom_argc-1] = new_arg;
684
custom_argv[custom_argc] = NULL;
688
ret = fclose(conffp);
689
} while(ret == EOF and errno == EINTR);
691
error(0, errno, "fclose");
692
exitstatus = EX_IOERR;
697
/* Check for harmful errors and go to fallback. Other errors might
698
not affect opening plugins */
699
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
700
error(0, errno, "fopen");
701
exitstatus = EX_OSERR;
705
/* If there were any arguments from the configuration file, pass
706
them to parser as command line arguments */
707
if(custom_argv != NULL){
708
ret = argp_parse(&argp, custom_argc, custom_argv,
709
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
717
error(0, errno, "argp_parse");
718
exitstatus = EX_OSERR;
721
exitstatus = EX_CONFIG;
726
/* Parse actual command line arguments, to let them override the
728
ret = argp_parse(&argp, argc, argv,
729
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
737
error(0, errno, "argp_parse");
738
exitstatus = EX_OSERR;
741
exitstatus = EX_USAGE;
256
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
746
259
for(plugin *p = plugin_list; p != NULL; p=p->next){
749
262
for(char **a = p->argv; *a != NULL; a++){
750
263
fprintf(stderr, "\tArg: %s\n", *a);
752
fprintf(stderr, "...and %d environment variables\n", p->envc);
753
for(char **a = p->environ; *a != NULL; a++){
754
fprintf(stderr, "\t%s\n", *a);
760
/* Work around Debian bug #633582:
761
<http://bugs.debian.org/633582> */
762
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
763
if(plugindir_fd == -1){
764
error(0, errno, "open");
766
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
768
error(0, errno, "fstat");
770
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
771
ret = fchown(plugindir_fd, uid, gid);
773
error(0, errno, "fchown");
777
TEMP_FAILURE_RETRY(close(plugindir_fd));
781
/* Lower permissions */
784
error(0, errno, "setgid");
788
error(0, errno, "setuid");
791
/* Open plugin directory with close_on_exec flag */
268
dir = opendir(plugindir);
270
perror("Could not open plugin dir");
271
exitstatus = EXIT_FAILURE;
275
/* Set the FD_CLOEXEC flag on the directory, if possible */
794
if(plugindir == NULL){
795
dir_fd = open(PDIR, O_RDONLY |
798
#else /* not O_CLOEXEC */
800
#endif /* not O_CLOEXEC */
803
dir_fd = open(plugindir, O_RDONLY |
806
#else /* not O_CLOEXEC */
808
#endif /* not O_CLOEXEC */
812
error(0, errno, "Could not open plugin dir");
813
exitstatus = EX_UNAVAILABLE;
818
/* Set the FD_CLOEXEC flag on the directory */
819
ret = set_cloexec_flag(dir_fd);
821
error(0, errno, "set_cloexec_flag");
822
TEMP_FAILURE_RETRY(close(dir_fd));
823
exitstatus = EX_OSERR;
826
#endif /* O_CLOEXEC */
828
dir = fdopendir(dir_fd);
830
error(0, errno, "Could not open plugin dir");
831
TEMP_FAILURE_RETRY(close(dir_fd));
832
exitstatus = EX_OSERR;
277
int dir_fd = dirfd(dir);
279
ret = set_cloexec_flag(dir_fd);
281
perror("set_cloexec_flag");
282
exitstatus = EXIT_FAILURE;
837
288
FD_ZERO(&rfds_all);
839
/* Read and execute any executable in the plugin directory*/
842
dirst = readdir(dir);
843
} while(dirst == NULL and errno == EINTR);
291
dirst = readdir(dir);
845
/* All directory entries have been processed */
293
// All directory entries have been processed
846
294
if(dirst == NULL){
848
error(0, errno, "readdir");
849
exitstatus = EX_IOERR;
855
298
d_name_len = strlen(dirst->d_name);
857
/* Ignore dotfiles, backup files and other junk */
300
// Ignore dotfiles, backup files and other junk
859
302
bool bad_name = false;
861
const char * const bad_prefixes[] = { ".", "#", NULL };
304
const char const *bad_prefixes[] = { ".", "#", NULL };
863
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
306
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
866
308
".dpkg-divert", NULL };
868
#pragma GCC diagnostic push
869
#pragma GCC diagnostic ignored "-Wcast-qual"
871
for(const char **pre = (const char **)bad_prefixes;
872
*pre != NULL; pre++){
874
#pragma GCC diagnostic pop
309
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
876
310
size_t pre_len = strlen(*pre);
877
311
if((d_name_len >= pre_len)
878
312
and strncmp((dirst->d_name), *pre, pre_len) == 0){
373
plugin *p = getplugin(dirst->d_name, &plugin_list);
964
375
/* Add global arguments to argument list for this plugin */
965
plugin *g = getplugin(NULL);
967
for(char **a = g->argv + 1; *a != NULL; a++){
968
if(not add_argument(p, *a)){
969
error(0, errno, "add_argument");
972
/* Add global environment variables */
973
for(char **e = g->environ; *e != NULL; e++){
974
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
980
/* If this plugin has any environment variables, we will call
981
using execve and need to duplicate the environment from this
983
if(p->environ[0] != NULL){
984
for(char **e = environ; *e != NULL; e++){
985
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
992
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
994
error(0, errno, "pipe");
995
exitstatus = EX_OSERR;
998
/* Ask OS to automatic close the pipe on exec */
376
plugin *g = getplugin(NULL, &plugin_list);
377
for(char **a = g->argv + 1; *a != NULL; a++){
385
exitstatus = EXIT_FAILURE;
999
388
ret = set_cloexec_flag(pipefd[0]);
1001
error(0, errno, "set_cloexec_flag");
1002
exitstatus = EX_OSERR;
390
perror("set_cloexec_flag");
391
exitstatus = EXIT_FAILURE;
1005
394
ret = set_cloexec_flag(pipefd[1]);
1007
error(0, errno, "set_cloexec_flag");
1008
exitstatus = EX_OSERR;
396
perror("set_cloexec_flag");
397
exitstatus = EXIT_FAILURE;
1011
400
/* Block SIGCHLD until process is safely in process list */
1012
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1013
&sigchld_action.sa_mask,
401
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1016
error(0, errno, "sigprocmask");
1017
exitstatus = EX_OSERR;
1020
/* Starting a new process to be watched */
1024
} while(pid == -1 and errno == EINTR);
1026
error(0, errno, "fork");
1027
exitstatus = EX_OSERR;
403
perror("sigprocmask");
404
exitstatus = EXIT_FAILURE;
407
// Starting a new process to be watched
1031
410
/* this is the child process */
1032
411
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1034
error(0, errno, "sigaction");
1037
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
416
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1039
error(0, errno, "sigprocmask");
1043
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1045
error(0, errno, "dup2");
418
perror("sigprocmask");
421
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1049
423
if(dirfd(dir) < 0){
1050
424
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1051
425
above and must now close it manually here. */
1054
if(p->environ[0] == NULL){
1055
if(execv(filename, p->argv) < 0){
1056
error(0, errno, "execv for %s", filename);
1060
if(execve(filename, p->argv, p->environ) < 0){
1061
error(0, errno, "execve for %s", filename);
428
if(execv(filename, p->argv) < 0){
1067
/* Parent process */
1068
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1071
plugin *new_plugin = getplugin(dirst->d_name);
1072
if(new_plugin == NULL){
1073
error(0, errno, "getplugin");
1074
ret = (int)(TEMP_FAILURE_RETRY
1075
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
436
close(pipefd[1]); /* close unused write end of pipe */
437
process *new_process = malloc(sizeof(process));
438
if (new_process == NULL){
440
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1078
error(0, errno, "sigprocmask");
442
perror("sigprocmask");
1080
exitstatus = EX_OSERR;
444
exitstatus = EXIT_FAILURE;
1084
new_plugin->pid = pid;
1085
new_plugin->fd = pipefd[0];
448
*new_process = (struct process){ .pid = pid,
450
.next = process_list };
452
process_list = new_process;
1087
453
/* Unblock SIGCHLD so signal handler can be run if this process
1088
454
has already completed */
1089
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1090
&sigchld_action.sa_mask,
455
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1093
error(0, errno, "sigprocmask");
1094
exitstatus = EX_OSERR;
1098
#if defined (__GNUC__) and defined (__GLIBC__)
1099
#if not __GLIBC_PREREQ(2, 16)
1100
#pragma GCC diagnostic push
1101
#pragma GCC diagnostic ignored "-Wsign-conversion"
1104
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion in GNU libc
1107
#if defined (__GNUC__) and defined (__GLIBC__)
1108
#if not __GLIBC_PREREQ(2, 16)
1109
#pragma GCC diagnostic pop
1113
if(maxfd < new_plugin->fd){
1114
maxfd = new_plugin->fd;
1118
TEMP_FAILURE_RETRY(closedir(dir));
457
perror("sigprocmask");
458
exitstatus = EXIT_FAILURE;
462
FD_SET(new_process->fd, &rfds_all);
464
if (maxfd < new_process->fd){
465
maxfd = new_process->fd;
470
/* Free the plugin list */
471
for(plugin *next; plugin_list != NULL; plugin_list = next){
472
next = plugin_list->next;
473
free(plugin_list->argv);
1120
free_plugin(getplugin(NULL));
1122
for(plugin *p = plugin_list; p != NULL; p = p->next){
1126
if(p->next == NULL){
1127
fprintf(stderr, "No plugin processes started. Incorrect plugin"
480
if (process_list == NULL){
481
fprintf(stderr, "No plugin processes started, exiting\n");
482
exitstatus = EXIT_FAILURE;
1133
/* Main loop while running plugins exist */
1135
486
fd_set rfds = rfds_all;
1136
487
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1137
if(select_ret == -1 and errno != EINTR){
1138
error(0, errno, "select");
1139
exitstatus = EX_OSERR;
488
if (select_ret == -1){
490
exitstatus = EXIT_FAILURE;
1142
493
/* OK, now either a process completed, or something can be read
1143
494
from one of them */
1144
for(plugin *proc = plugin_list; proc != NULL;){
495
for(process *proc = process_list; proc ; proc = proc->next){
1145
496
/* Is this process completely done? */
1146
if(proc->completed and proc->eof){
497
if(proc->eof and proc->completed){
1147
498
/* Only accept the plugin output if it exited cleanly */
1148
499
if(not WIFEXITED(proc->status)
1149
500
or WEXITSTATUS(proc->status) != 0){
1150
501
/* Bad exit by plugin */
1153
503
if(WIFEXITED(proc->status)){
1154
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1155
" status %d\n", proc->name,
1156
(intmax_t) (proc->pid),
1157
WEXITSTATUS(proc->status));
1158
} else if(WIFSIGNALED(proc->status)){
1159
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1160
" signal %d: %s\n", proc->name,
1161
(intmax_t) (proc->pid),
1162
WTERMSIG(proc->status),
1163
strsignal(WTERMSIG(proc->status)));
504
fprintf(stderr, "Plugin %d exited with status %d\n",
505
proc->pid, WEXITSTATUS(proc->status));
506
} else if(WIFSIGNALED(proc->status)) {
507
fprintf(stderr, "Plugin %d killed by signal %d\n",
508
proc->pid, WTERMSIG(proc->status));
1164
509
} else if(WCOREDUMP(proc->status)){
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1166
" core\n", proc->name, (intmax_t) (proc->pid));
510
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
1170
513
/* Remove the plugin */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic push
1174
#pragma GCC diagnostic ignored "-Wsign-conversion"
1177
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1178
-Wconversion in GNU libc
1180
#if defined (__GNUC__) and defined (__GLIBC__)
1181
#if not __GLIBC_PREREQ(2, 16)
1182
#pragma GCC diagnostic pop
514
FD_CLR(proc->fd, &rfds_all);
1186
515
/* Block signal while modifying process_list */
1187
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1189
&sigchld_action.sa_mask,
516
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1192
error(0, errno, "sigprocmask");
1193
exitstatus = EX_OSERR;
1197
plugin *next_plugin = proc->next;
518
perror("sigprocmask");
519
exitstatus = EXIT_FAILURE;
522
/* Delete this process entry from the list */
523
if(process_list == proc){
524
/* First one - simple */
525
process_list = proc->next;
527
/* Second one or later */
528
for(process *p = process_list; p != NULL; p = p->next){
530
p->next = proc->next;
1201
535
/* We are done modifying process list, so unblock signal */
1202
ret = (int)(TEMP_FAILURE_RETRY
1203
(sigprocmask(SIG_UNBLOCK,
1204
&sigchld_action.sa_mask, NULL)));
536
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1206
error(0, errno, "sigprocmask");
1207
exitstatus = EX_OSERR;
1211
if(plugin_list == NULL){
539
perror("sigprocmask");
543
/* We deleted this process from the list, so we can't go
544
proc->next. Therefore, start over from the beginning of
1218
548
/* This process exited nicely, so print its buffer */
1220
bool bret = print_out_password(proc->buffer,
1221
proc->buffer_length);
1223
error(0, errno, "print_out_password");
1224
exitstatus = EX_IOERR;
549
for(size_t written = 0; written < proc->buffer_length;
550
written += (size_t)ret){
551
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
552
proc->buffer + written,
557
exitstatus = EXIT_FAILURE;
1229
563
/* This process has not completed. Does it have any output? */
1230
#if defined (__GNUC__) and defined (__GLIBC__)
1231
#if not __GLIBC_PREREQ(2, 16)
1232
#pragma GCC diagnostic push
1233
#pragma GCC diagnostic ignored "-Wsign-conversion"
1236
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1242
#if defined (__GNUC__) and defined (__GLIBC__)
1243
#if not __GLIBC_PREREQ(2, 16)
1244
#pragma GCC diagnostic pop
564
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1247
565
/* This process had nothing to say at this time */
1251
568
/* Before reading, make the process' data buffer large enough */
1252
569
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1253
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1254
+ (size_t) BUFFER_SIZE);
1255
if(new_buffer == NULL){
1256
error(0, errno, "malloc");
1257
exitstatus = EX_OSERR;
570
proc->buffer = realloc(proc->buffer, proc->buffer_size
571
+ (size_t) BUFFER_SIZE);
572
if (proc->buffer == NULL){
574
exitstatus = EXIT_FAILURE;
1260
proc->buffer = new_buffer;
1261
577
proc->buffer_size += BUFFER_SIZE;
1263
579
/* Read from the process */
1264
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
+ proc->buffer_length,
580
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1269
583
/* Read error from this process; ignore the error */
1275
588
proc->eof = true;
1277
proc->buffer_length += (size_t) sret;
590
proc->buffer_length += (size_t) ret;
1285
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1286
and exitstatus != EX_OK)){
1287
/* Fallback if all plugins failed, none are found or an error
1290
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1291
char *passwordbuffer = getpass("Password: ");
1292
size_t len = strlen(passwordbuffer);
1293
/* Strip trailing newline */
1294
if(len > 0 and passwordbuffer[len-1] == '\n'){
1295
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1298
bret = print_out_password(passwordbuffer, len);
1300
error(0, errno, "print_out_password");
1301
exitstatus = EX_IOERR;
594
if(process_list == NULL){
595
fprintf(stderr, "All plugin processes failed, exiting\n");
596
exitstatus = EXIT_FAILURE;
1305
600
/* Restore old signal handler */
1306
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1308
error(0, errno, "sigaction");
1309
exitstatus = EX_OSERR;
601
sigaction(SIGCHLD, &old_sigchld_action, NULL);
1312
if(custom_argv != NULL){
1313
for(char **arg = custom_argv+1; *arg != NULL; arg++){
603
/* Free the plugin list */
604
for(plugin *next; plugin_list != NULL; plugin_list = next){
605
next = plugin_list->next;
606
free(plugin_list->argv);
1319
610
if(dir != NULL){
1323
/* Kill the processes */
1324
for(plugin *p = plugin_list; p != NULL; p = p->next){
1327
ret = kill(p->pid, SIGTERM);
1328
if(ret == -1 and errno != ESRCH){
1329
/* Set-uid proccesses might not get closed */
1330
error(0, errno, "kill");
614
/* Free the process list and kill the processes */
615
for(process *next; process_list != NULL; process_list = next){
616
next = process_list->next;
617
close(process_list->fd);
618
kill(process_list->pid, SIGTERM);
619
free(process_list->buffer);
1335
623
/* Wait for any remaining child processes to terminate */
1337
625
ret = wait(NULL);
1338
626
} while(ret >= 0);
1339
627
if(errno != ECHILD){
1340
error(0, errno, "wait");
1348
631
return exitstatus;