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
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
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> /* DIR, fdopendir(), fstat(), 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(),
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
28
44
#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() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
37
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
48
58
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
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() */
75
#include <fnmatch.h> /* fnmatch() */
53
77
#define BUFFER_SIZE 256
57
typedef struct process{
79
#define PDIR "/lib/mandos/plugins.d"
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
85
typedef struct plugin{
86
char *name; /* can be NULL or any plugin name */
93
/* Variables used for running processes*/
61
97
size_t buffer_size;
62
98
size_t buffer_length;
100
volatile sig_atomic_t completed;
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
74
102
struct plugin *next;
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
80
or (p->name and name and (strcmp(p->name, name) == 0))){
105
static plugin *plugin_list = NULL;
107
/* Gets an existing plugin based on name,
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
114
or (p->name and name and (strcmp(p->name, name) == 0))){
84
118
/* Create a new plugin */
85
plugin *new_plugin = malloc(sizeof(plugin));
86
if (new_plugin == NULL){
90
new_plugin->name = name;
91
new_plugin->argv = malloc(sizeof(char *) * 2);
92
if (new_plugin->argv == NULL){
96
new_plugin->argv[0] = name;
119
plugin *new_plugin = NULL;
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
126
char *copy_name = NULL;
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
131
if(copy_name == NULL){
139
*new_plugin = (plugin){ .name = copy_name,
142
.next = plugin_list };
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
154
new_plugin->argv[0] = copy_name;
97
155
new_plugin->argv[1] = NULL;
99
new_plugin->disabled = false;
100
new_plugin->next = *plugin_list;
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
160
if(new_plugin->environ == NULL){
163
free(new_plugin->argv);
168
new_plugin->environ[0] = NULL;
101
170
/* Append the new plugin to the list */
102
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
103
172
return new_plugin;
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
114
p->argv[p->argc] = NULL;
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
static bool add_to_char_array(const char *new, char ***array,
179
/* Resize the pointed-to array to hold one more pointer */
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);
186
if(new_array == NULL){
190
/* Make a copy of the new string */
194
} while(copy == NULL and errno == EINTR);
198
/* Insert the copy */
199
(*array)[*len] = copy;
201
/* Add a new terminating NULL pointer to the last element */
202
(*array)[*len] = NULL;
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
static bool add_argument(plugin *p, const char *arg){
212
return add_to_char_array(arg, &(p->argv), &(p->argc));
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
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);
241
return add_to_char_array(def, &(p->environ), &(p->envc));
118
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
119
246
* Descriptor Flags".
120
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
122
static int set_cloexec_flag(int fd)
124
int ret = fcntl(fd, F_GETFD, 0);
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));
125
252
/* If reading the flags failed, return error indication now. */
129
256
/* Store modified flag word in the descriptor. */
130
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
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
262
/* Mark processes as completed when they exit, and save their exit
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;
264
static void handle_sigchld(__attribute__((unused)) int sig){
265
int old_errno = errno;
267
plugin *proc = plugin_list;
269
pid_t pid = waitpid(-1, &status, WNOHANG);
271
/* Only still running child processes */
276
/* No child processes */
279
error(0, errno, "waitpid");
282
/* A child exited, find it in process_list */
283
while(proc != NULL and proc->pid != pid){
287
/* Process not found in process list */
290
proc->status = status;
296
/* Prints out a password to stdout */
297
__attribute__((nonnull, warn_unused_result))
298
static bool print_out_password(const char *buffer, size_t length){
300
for(size_t written = 0; written < length; written += (size_t)ret){
301
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
310
/* Removes and free a plugin from the plugin list */
311
__attribute__((nonnull))
312
static void free_plugin(plugin *plugin_node){
314
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
free(plugin_node->argv);
318
for(char **env = plugin_node->environ; *env != NULL; env++){
321
free(plugin_node->environ);
322
free(plugin_node->buffer);
324
/* Removes the plugin from the singly-linked list */
325
if(plugin_node == plugin_list){
326
/* First one - simple */
327
plugin_list = plugin_list->next;
329
/* Second one or later */
330
for(plugin *p = plugin_list; p != NULL; p = p->next){
331
if(p->next == plugin_node){
332
p->next = plugin_node->next;
341
static void free_plugin_list(void){
342
while(plugin_list != NULL){
343
free_plugin(plugin_list);
155
347
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
348
char *plugindir = NULL;
349
char *argfile = NULL;
159
352
struct dirent *dirst;
162
355
int ret, maxfd = 0;
163
357
uid_t uid = 65534;
164
358
gid_t gid = 65534;
165
359
bool debug = false;
188
385
{ .name = "global-options", .key = 'g',
189
386
.arg = "OPTION[,OPTION[,...]]",
190
387
.doc = "Options passed to all plugins" },
388
{ .name = "global-env", .key = 'G',
390
.doc = "Environment variable passed to all plugins" },
191
391
{ .name = "options-for", .key = 'o',
192
392
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
193
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" },
194
397
{ .name = "disable", .key = 'd',
196
399
.doc = "Disable a specific plugin", .group = 1 },
400
{ .name = "enable", .key = 'e',
402
.doc = "Enable a specific plugin", .group = 1 },
197
403
{ .name = "plugin-dir", .key = 128,
198
404
.arg = "DIRECTORY",
199
405
.doc = "Specify a different plugin directory", .group = 2 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.doc = "Debug mode", .group = 3 },
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 },
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
212
/* Get the INPUT argument from `argp_parse', which we know is a
213
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
218
char *p = strtok(arg, ",");
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
240
getplugin(arg, plugins)->disabled = true;
247
uid = (uid_t)strtol(arg, NULL, 10);
250
gid = (gid_t)strtol(arg, NULL, 10);
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 */
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
264
return ARGP_ERR_UNKNOWN;
269
plugin *plugin_list = NULL;
271
struct argp argp = { .options = options, .parser = parse_opt,
272
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
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,
273
618
.doc = "Mandos plugin runner -- Run plugins" };
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
288
exitstatus = EXIT_FAILURE;
291
plus_argv[0] = argv[0];
293
arg = strtok(plus_options, delims); /* Get first argument */
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
300
exitstatus = EXIT_FAILURE;
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
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
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;
314
768
for(char **a = p->argv; *a != NULL; a++){
315
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");
320
807
ret = setuid(uid);
330
dir = opendir(plugindir);
332
perror("Could not open plugin dir");
333
exitstatus = EXIT_FAILURE;
337
/* Set the FD_CLOEXEC flag on the directory, if possible */
809
error(0, errno, "setuid");
812
/* Open plugin directory with close_on_exec flag */
339
int dir_fd = dirfd(dir);
341
ret = set_cloexec_flag(dir_fd);
343
perror("set_cloexec_flag");
344
exitstatus = EXIT_FAILURE;
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
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
836
#endif /* O_CLOEXEC */
838
dir = fdopendir(dir_fd);
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
350
847
FD_ZERO(&rfds_all);
849
/* Read and execute any executable in the plugin directory*/
353
dirst = readdir(dir);
852
dirst = readdir(dir);
853
} while(dirst == NULL and errno == EINTR);
355
// All directory entries have been processed
855
/* All directory entries have been processed */
356
856
if(dirst == NULL){
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
360
d_name_len = strlen(dirst->d_name);
362
// Ignore dotfiles, backup files and other junk
865
/* Ignore dotfiles, backup files and other junk */
364
867
bool bad_name = false;
366
const char const *bad_prefixes[] = { ".", "#", NULL };
368
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
370
".dpkg-divert", NULL };
371
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
372
size_t pre_len = strlen(*pre);
373
if((d_name_len >= pre_len)
374
and strncmp((dirst->d_name), *pre, pre_len) == 0){
376
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
377
" with bad prefix %s\n", dirst->d_name, *pre);
388
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
389
size_t suf_len = strlen(*suf);
390
if((d_name_len >= suf_len)
391
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
394
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
395
" with bad suffix %s\n", dirst->d_name, *suf);
407
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
408
if (filename == NULL){
410
exitstatus = EXIT_FAILURE;
413
strcpy(filename, plugindir); /* Spurious warning */
414
strcat(filename, "/"); /* Spurious warning */
415
strcat(filename, dirst->d_name); /* Spurious warning */
419
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
868
const char * const patterns[] = { ".*", "#*#", "*~",
869
"*.dpkg-new", "*.dpkg-old",
870
"*.dpkg-bak", "*.dpkg-divert",
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
879
#pragma GCC diagnostic pop
881
if(fnmatch(*pat, dirst->d_name,
882
FNM_FILE_NAME | FNM_PERIOD) != FNM_NOMATCH){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirst->d_name, *pat);
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
899
#else /* not O_CLOEXEC */
901
#endif /* not O_CLOEXEC */
904
error(0, errno, "Could not open plugin");
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
918
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
923
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
421
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
422
" with bad type or mode\n", filename);
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
932
TEMP_FAILURE_RETRY(close(plugin_fd));
936
plugin *p = getplugin(dirst->d_name);
938
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
429
944
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
947
TEMP_FAILURE_RETRY(close(plugin_fd));
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
437
951
/* Add global arguments to argument list for this plugin */
438
plugin *g = getplugin(NULL, &plugin_list);
439
for(char **a = g->argv + 1; *a != NULL; a++){
447
exitstatus = EXIT_FAILURE;
952
plugin *g = getplugin(NULL);
954
for(char **a = g->argv + 1; *a != NULL; a++){
955
if(not add_argument(p, *a)){
956
error(0, errno, "add_argument");
959
/* Add global environment variables */
960
for(char **e = g->environ; *e != NULL; e++){
961
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
969
if(p->environ[0] != NULL){
970
for(char **e = environ; *e != NULL; e++){
971
if(not add_environment(p, *e, false)){
972
error(0, errno, "add_environment");
978
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
980
error(0, errno, "pipe");
981
exitstatus = EX_OSERR;
984
/* Ask OS to automatic close the pipe on exec */
450
985
ret = set_cloexec_flag(pipefd[0]);
452
perror("set_cloexec_flag");
453
exitstatus = EXIT_FAILURE;
987
error(0, errno, "set_cloexec_flag");
988
TEMP_FAILURE_RETRY(close(pipefd[0]));
989
TEMP_FAILURE_RETRY(close(pipefd[1]));
990
exitstatus = EX_OSERR;
456
993
ret = set_cloexec_flag(pipefd[1]);
458
perror("set_cloexec_flag");
459
exitstatus = EXIT_FAILURE;
995
error(0, errno, "set_cloexec_flag");
996
TEMP_FAILURE_RETRY(close(pipefd[0]));
997
TEMP_FAILURE_RETRY(close(pipefd[1]));
998
exitstatus = EX_OSERR;
462
1001
/* Block SIGCHLD until process is safely in process list */
463
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1002
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1003
&sigchld_action.sa_mask,
465
perror("sigprocmask");
466
exitstatus = EXIT_FAILURE;
469
// Starting a new process to be watched
1006
error(0, errno, "sigprocmask");
1007
exitstatus = EX_OSERR;
1010
/* Starting a new process to be watched */
1014
} while(pid == -1 and errno == EINTR);
1016
error(0, errno, "fork");
1017
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1018
&sigchld_action.sa_mask, NULL));
1019
TEMP_FAILURE_RETRY(close(pipefd[0]));
1020
TEMP_FAILURE_RETRY(close(pipefd[1]));
1021
exitstatus = EX_OSERR;
472
1025
/* this is the child process */
473
1026
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1028
error(0, errno, "sigaction");
478
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1031
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
480
perror("sigprocmask");
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1033
error(0, errno, "sigprocmask");
1037
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1039
error(0, errno, "dup2");
485
1043
if(dirfd(dir) < 0){
486
1044
/* If dir has no file descriptor, we could not set FD_CLOEXEC
487
1045
above and must now close it manually here. */
490
if(execv(filename, p->argv) < 0){
1048
if(fexecve(plugin_fd, p->argv,
1049
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1050
error(0, errno, "fexecve for %s/%s",
1051
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
502
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1056
/* Parent process */
1057
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1059
TEMP_FAILURE_RETRY(close(plugin_fd));
1060
plugin *new_plugin = getplugin(dirst->d_name);
1061
if(new_plugin == NULL){
1062
error(0, errno, "getplugin");
1063
ret = (int)(TEMP_FAILURE_RETRY
1064
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
504
perror("sigprocmask");
1067
error(0, errno, "sigprocmask");
506
exitstatus = EXIT_FAILURE;
1069
exitstatus = EX_OSERR;
510
*new_process = (struct process){ .pid = pid,
512
.next = process_list };
514
process_list = new_process;
1073
new_plugin->pid = pid;
1074
new_plugin->fd = pipefd[0];
515
1076
/* Unblock SIGCHLD so signal handler can be run if this process
516
1077
has already completed */
517
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1078
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1079
&sigchld_action.sa_mask,
519
perror("sigprocmask");
520
exitstatus = EXIT_FAILURE;
524
FD_SET(new_process->fd, &rfds_all);
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
1082
error(0, errno, "sigprocmask");
1083
exitstatus = EX_OSERR;
1087
#if defined (__GNUC__) and defined (__GLIBC__)
1088
#if not __GLIBC_PREREQ(2, 16)
1089
#pragma GCC diagnostic push
1090
#pragma GCC diagnostic ignored "-Wsign-conversion"
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1094
-Wconversion in GNU libc
1096
#if defined (__GNUC__) and defined (__GLIBC__)
1097
#if not __GLIBC_PREREQ(2, 16)
1098
#pragma GCC diagnostic pop
1102
if(maxfd < new_plugin->fd){
1103
maxfd = new_plugin->fd;
1107
TEMP_FAILURE_RETRY(closedir(dir));
1109
free_plugin(getplugin(NULL));
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
1111
for(plugin *p = plugin_list; p != NULL; p = p->next){
1115
if(p->next == NULL){
1116
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1122
/* Main loop while running plugins exist */
548
1124
fd_set rfds = rfds_all;
549
1125
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
550
if (select_ret == -1){
552
exitstatus = EXIT_FAILURE;
1126
if(select_ret == -1 and errno != EINTR){
1127
error(0, errno, "select");
1128
exitstatus = EX_OSERR;
555
1131
/* OK, now either a process completed, or something can be read
556
1132
from one of them */
557
for(process *proc = process_list; proc ; proc = proc->next){
1133
for(plugin *proc = plugin_list; proc != NULL;){
558
1134
/* Is this process completely done? */
559
if(proc->eof and proc->completed){
1135
if(proc->completed and proc->eof){
560
1136
/* Only accept the plugin output if it exited cleanly */
561
1137
if(not WIFEXITED(proc->status)
562
1138
or WEXITSTATUS(proc->status) != 0){
563
1139
/* Bad exit by plugin */
565
1142
if(WIFEXITED(proc->status)){
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
568
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1144
" status %d\n", proc->name,
1145
(intmax_t) (proc->pid),
1146
WEXITSTATUS(proc->status));
1147
} else if(WIFSIGNALED(proc->status)){
1148
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1149
" signal %d: %s\n", proc->name,
1150
(intmax_t) (proc->pid),
1151
WTERMSIG(proc->status),
1152
strsignal(WTERMSIG(proc->status)));
571
1153
} else if(WCOREDUMP(proc->status)){
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
1154
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1155
" core\n", proc->name, (intmax_t) (proc->pid));
575
1159
/* Remove the plugin */
576
FD_CLR(proc->fd, &rfds_all);
1160
#if defined (__GNUC__) and defined (__GLIBC__)
1161
#if not __GLIBC_PREREQ(2, 16)
1162
#pragma GCC diagnostic push
1163
#pragma GCC diagnostic ignored "-Wsign-conversion"
1166
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1167
-Wconversion in GNU libc
1169
#if defined (__GNUC__) and defined (__GLIBC__)
1170
#if not __GLIBC_PREREQ(2, 16)
1171
#pragma GCC diagnostic pop
577
1175
/* Block signal while modifying process_list */
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1176
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1178
&sigchld_action.sa_mask,
580
perror("sigprocmask");
581
exitstatus = EXIT_FAILURE;
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
592
p->next = proc->next;
1181
error(0, errno, "sigprocmask");
1182
exitstatus = EX_OSERR;
1186
plugin *next_plugin = proc->next;
597
1190
/* We are done modifying process list, so unblock signal */
598
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1191
ret = (int)(TEMP_FAILURE_RETRY
1192
(sigprocmask(SIG_UNBLOCK,
1193
&sigchld_action.sa_mask, NULL)));
601
perror("sigprocmask");
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
1195
error(0, errno, "sigprocmask");
1196
exitstatus = EX_OSERR;
1200
if(plugin_list == NULL){
610
1207
/* This process exited nicely, so print its buffer */
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
619
exitstatus = EXIT_FAILURE;
1209
bool bret = print_out_password(proc->buffer,
1210
proc->buffer_length);
1212
error(0, errno, "print_out_password");
1213
exitstatus = EX_IOERR;
625
1218
/* This process has not completed. Does it have any output? */
626
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1219
#if defined (__GNUC__) and defined (__GLIBC__)
1220
#if not __GLIBC_PREREQ(2, 16)
1221
#pragma GCC diagnostic push
1222
#pragma GCC diagnostic ignored "-Wsign-conversion"
1225
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1231
#if defined (__GNUC__) and defined (__GLIBC__)
1232
#if not __GLIBC_PREREQ(2, 16)
1233
#pragma GCC diagnostic pop
627
1236
/* This process had nothing to say at this time */
630
1240
/* Before reading, make the process' data buffer large enough */
631
1241
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
632
proc->buffer = realloc(proc->buffer, proc->buffer_size
633
+ (size_t) BUFFER_SIZE);
634
if (proc->buffer == NULL){
636
exitstatus = EXIT_FAILURE;
1242
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1243
+ (size_t) BUFFER_SIZE);
1244
if(new_buffer == NULL){
1245
error(0, errno, "malloc");
1246
exitstatus = EX_OSERR;
1249
proc->buffer = new_buffer;
639
1250
proc->buffer_size += BUFFER_SIZE;
641
1252
/* Read from the process */
642
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1253
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1255
+ proc->buffer_length,
645
1258
/* Read error from this process; ignore the error */
650
1264
proc->eof = true;
652
proc->buffer_length += (size_t) ret;
1266
proc->buffer_length += (size_t) sret;
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
1274
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1275
and exitstatus != EX_OK)){
1276
/* Fallback if all plugins failed, none are found or an error
1279
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1280
char *passwordbuffer = getpass("Password: ");
1281
size_t len = strlen(passwordbuffer);
1282
/* Strip trailing newline */
1283
if(len > 0 and passwordbuffer[len-1] == '\n'){
1284
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1287
bret = print_out_password(passwordbuffer, len);
1289
error(0, errno, "print_out_password");
1290
exitstatus = EX_IOERR;
662
1294
/* Restore old signal handler */
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
1295
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1297
error(0, errno, "sigaction");
1298
exitstatus = EX_OSERR;
1301
if(custom_argv != NULL){
1302
for(char **arg = custom_argv+1; *arg != NULL; arg++){
674
1308
if(dir != NULL){
678
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
1312
/* Kill the processes */
1313
for(plugin *p = plugin_list; p != NULL; p = p->next){
1316
ret = kill(p->pid, SIGTERM);
1317
if(ret == -1 and errno != ESRCH){
1318
/* Set-uid proccesses might not get closed */
1319
error(0, errno, "kill");
687
1324
/* Wait for any remaining child processes to terminate */
689
1326
ret = wait(NULL);
690
1327
} while(ret >= 0);
691
1328
if(errno != ECHILD){
1329
error(0, errno, "wait");
695
1337
return exitstatus;