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> /* 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() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
28
42
#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(),
43
#include <dirent.h> /* struct dirent, scandirat() */
44
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
45
FD_CLOEXEC, write(), STDOUT_FILENO,
46
struct stat, fstat(), close(),
47
setgid(), setuid(), S_ISREG(),
48
faccessat() pipe2(), fork(),
49
_exit(), dup2(), fexecve(), read()
51
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
52
FD_CLOEXEC, openat(), scandirat(),
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
48
56
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
55
typedef struct process{
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
62
#include <signal.h> /* struct sigaction, sigemptyset(),
63
sigaddset(), sigaction(),
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
69
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
70
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
71
#include <errno.h> /* errno */
72
#include <error.h> /* error() */
73
#include <fnmatch.h> /* fnmatch() */
75
#define BUFFER_SIZE 256
77
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
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*/
59
96
size_t buffer_size;
60
97
size_t buffer_length;
99
volatile sig_atomic_t completed;
67
typedef struct plugin{
68
char *name; /* can be NULL or any plugin name */
72
101
struct plugin *next;
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))){
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))){
82
117
/* Create a new plugin */
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;
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;
95
154
new_plugin->argv[1] = NULL;
97
new_plugin->disabled = false;
98
new_plugin->next = *plugin_list;
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;
99
169
/* Append the new plugin to the list */
100
*plugin_list = new_plugin;
170
plugin_list = new_plugin;
101
171
return new_plugin;
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;
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));
116
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
117
246
* Descriptor Flags".
118
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
120
int set_cloexec_flag(int fd)
122
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));
123
252
/* If reading the flags failed, return error indication now. */
127
256
/* Store modified flag word in the descriptor. */
128
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
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
260
#endif /* not O_CLOEXEC */
263
/* 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;
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);
155
348
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
159
struct dirent *dirst;
349
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
351
char *argfile = NULL;
353
struct dirent **direntries = NULL;
162
356
int ret, maxfd = 0;
163
358
uid_t uid = 65534;
164
359
gid_t gid = 65534;
165
360
bool debug = false;
186
386
{ .name = "global-options", .key = 'g',
187
387
.arg = "OPTION[,OPTION[,...]]",
188
388
.doc = "Options passed to all plugins" },
389
{ .name = "global-env", .key = 'G',
391
.doc = "Environment variable passed to all plugins" },
189
392
{ .name = "options-for", .key = 'o',
190
393
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
191
394
.doc = "Options passed only to specified plugin" },
395
{ .name = "env-for", .key = 'E',
396
.arg = "PLUGIN:ENV=value",
397
.doc = "Environment variable passed to specified plugin" },
192
398
{ .name = "disable", .key = 'd',
194
400
.doc = "Disable a specific plugin", .group = 1 },
401
{ .name = "enable", .key = 'e',
403
.doc = "Enable a specific plugin", .group = 1 },
195
404
{ .name = "plugin-dir", .key = 128,
196
405
.arg = "DIRECTORY",
197
406
.doc = "Specify a different plugin directory", .group = 2 },
198
{ .name = "userid", .key = 129,
199
.arg = "ID", .flags = 0,
200
.doc = "User ID the plugins will run as", .group = 2 },
201
{ .name = "groupid", .key = 130,
202
.arg = "ID", .flags = 0,
203
.doc = "Group ID the plugins will run as", .group = 2 },
204
{ .name = "debug", .key = 131,
205
.doc = "Debug mode", .group = 3 },
407
{ .name = "config-file", .key = 129,
409
.doc = "Specify a different configuration file", .group = 2 },
410
{ .name = "userid", .key = 130,
411
.arg = "ID", .flags = 0,
412
.doc = "User ID the plugins will run as", .group = 3 },
413
{ .name = "groupid", .key = 131,
414
.arg = "ID", .flags = 0,
415
.doc = "Group ID the plugins will run as", .group = 3 },
416
{ .name = "debug", .key = 132,
417
.doc = "Debug mode", .group = 4 },
418
{ .name = "plugin-helper-dir", .key = 133,
420
.doc = "Specify a different plugin helper directory",
423
* These reproduce what we would get without ARGP_NO_HELP
425
{ .name = "help", .key = '?',
426
.doc = "Give this help list", .group = -1 },
427
{ .name = "usage", .key = -3,
428
.doc = "Give a short usage message", .group = -1 },
429
{ .name = "version", .key = 'V',
430
.doc = "Print program version", .group = -1 },
209
error_t parse_opt (int key, char *arg, struct argp_state *state) {
210
/* Get the INPUT argument from `argp_parse', which we know is a
211
pointer to our plugin list pointer. */
212
plugin **plugins = state->input;
216
char *p = strtok(arg, ",");
218
addargument(getplugin(NULL, plugins), p);
219
p = strtok(NULL, ",");
225
char *name = strtok(arg, ":");
226
char *p = strtok(NULL, ":");
230
addargument(getplugin(name, plugins), p);
231
p = strtok(NULL, ",");
238
getplugin(arg, plugins)->disabled = true;
245
uid = (uid_t)strtol(arg, NULL, 10);
248
gid = (gid_t)strtol(arg, NULL, 10);
434
__attribute__((nonnull(3)))
435
error_t parse_opt(int key, char *arg, struct argp_state *state){
440
case 'g': /* --global-options */
443
while((plugin_option = strsep(&arg, ",")) != NULL){
444
if(not add_argument(getplugin(NULL), plugin_option)){
451
case 'G': /* --global-env */
452
if(add_environment(getplugin(NULL), arg, true)){
456
case 'o': /* --options-for */
458
char *option_list = strchr(arg, ':');
459
if(option_list == NULL){
460
argp_error(state, "No colon in \"%s\"", arg);
467
argp_error(state, "Empty plugin name");
472
while((option = strsep(&option_list, ",")) != NULL){
473
if(not add_argument(getplugin(arg), option)){
480
case 'E': /* --env-for */
482
char *envdef = strchr(arg, ':');
484
argp_error(state, "No colon in \"%s\"", arg);
491
argp_error(state, "Empty plugin name");
495
if(add_environment(getplugin(arg), envdef, true)){
500
case 'd': /* --disable */
502
plugin *p = getplugin(arg);
509
case 'e': /* --enable */
511
plugin *p = getplugin(arg);
518
case 128: /* --plugin-dir */
520
plugindir = strdup(arg);
521
if(plugindir != NULL){
525
case 129: /* --config-file */
526
/* This is already done by parse_opt_config_file() */
528
case 130: /* --userid */
529
tmp_id = strtoimax(arg, &tmp, 10);
530
if(errno != 0 or tmp == arg or *tmp != '\0'
531
or tmp_id != (uid_t)tmp_id){
532
argp_error(state, "Bad user ID number: \"%s\", using %"
533
PRIdMAX, arg, (intmax_t)uid);
539
case 131: /* --groupid */
540
tmp_id = strtoimax(arg, &tmp, 10);
541
if(errno != 0 or tmp == arg or *tmp != '\0'
542
or tmp_id != (gid_t)tmp_id){
543
argp_error(state, "Bad group ID number: \"%s\", using %"
544
PRIdMAX, arg, (intmax_t)gid);
550
case 132: /* --debug */
259
return ARGP_ERR_UNKNOWN;
264
plugin *plugin_list = NULL;
266
struct argp argp = { .options = options, .parser = parse_opt,
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
561
* These reproduce what we would get without ARGP_NO_HELP
563
case '?': /* --help */
564
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
565
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
566
case -3: /* --usage */
567
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
568
argp_state_help(state, state->out_stream,
569
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
570
case 'V': /* --version */
571
fprintf(state->out_stream, "%s\n", argp_program_version);
575
* When adding more options before this line, remember to also add a
576
* "case" to the "parse_opt_config_file" function below.
579
/* Cryptsetup always passes an argument, which is an empty
580
string if "none" was specified in /etc/crypttab. So if
581
argument was empty, we ignore it silently. */
586
return ARGP_ERR_UNKNOWN;
588
return errno; /* Set to 0 at start */
591
/* This option parser is the same as parse_opt() above, except it
592
ignores everything but the --config-file option. */
593
error_t parse_opt_config_file(int key, char *arg,
594
__attribute__((unused))
595
struct argp_state *state){
598
case 'g': /* --global-options */
599
case 'G': /* --global-env */
600
case 'o': /* --options-for */
601
case 'E': /* --env-for */
602
case 'd': /* --disable */
603
case 'e': /* --enable */
604
case 128: /* --plugin-dir */
606
case 129: /* --config-file */
608
argfile = strdup(arg);
613
case 130: /* --userid */
614
case 131: /* --groupid */
615
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
617
case '?': /* --help */
618
case -3: /* --usage */
619
case 'V': /* --version */
623
return ARGP_ERR_UNKNOWN;
628
struct argp argp = { .options = options,
629
.parser = parse_opt_config_file,
268
631
.doc = "Mandos plugin runner -- Run plugins" };
270
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
633
/* Parse using parse_opt_config_file() in order to get the custom
634
config file location, if any. */
635
ret = argp_parse(&argp, argc, argv,
636
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
644
error(0, errno, "argp_parse");
645
exitstatus = EX_OSERR;
648
exitstatus = EX_USAGE;
652
/* Reset to the normal argument parser */
653
argp.parser = parse_opt;
655
/* Open the configfile if available */
657
conffp = fopen(AFILE, "r");
659
conffp = fopen(argfile, "r");
662
char *org_line = NULL;
663
char *p, *arg, *new_arg, *line;
665
const char whitespace_delims[] = " \r\t\f\v\n";
666
const char comment_delim[] = "#";
669
custom_argv = malloc(sizeof(char*) * 2);
670
if(custom_argv == NULL){
671
error(0, errno, "malloc");
672
exitstatus = EX_OSERR;
675
custom_argv[0] = argv[0];
676
custom_argv[1] = NULL;
678
/* for each line in the config file, strip whitespace and ignore
681
sret = getline(&org_line, &size, conffp);
687
arg = strsep(&line, comment_delim);
688
while((p = strsep(&arg, whitespace_delims)) != NULL){
694
error(0, errno, "strdup");
695
exitstatus = EX_OSERR;
702
char **new_argv = realloc(custom_argv, sizeof(char *)
703
* ((size_t)custom_argc + 1));
704
if(new_argv == NULL){
705
error(0, errno, "realloc");
706
exitstatus = EX_OSERR;
711
custom_argv = new_argv;
714
custom_argv[custom_argc-1] = new_arg;
715
custom_argv[custom_argc] = NULL;
719
ret = fclose(conffp);
720
} while(ret == EOF and errno == EINTR);
722
error(0, errno, "fclose");
723
exitstatus = EX_IOERR;
728
/* Check for harmful errors and go to fallback. Other errors might
729
not affect opening plugins */
730
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
736
/* If there were any arguments from the configuration file, pass
737
them to parser as command line arguments */
738
if(custom_argv != NULL){
739
ret = argp_parse(&argp, custom_argc, custom_argv,
740
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
748
error(0, errno, "argp_parse");
749
exitstatus = EX_OSERR;
752
exitstatus = EX_CONFIG;
757
/* Parse actual command line arguments, to let them override the
759
ret = argp_parse(&argp, argc, argv,
760
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
768
error(0, errno, "argp_parse");
769
exitstatus = EX_OSERR;
772
exitstatus = EX_USAGE;
777
char *pluginhelperenv;
779
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
780
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
if(ret == -1 or not bret){
785
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
786
" environment variable to \"%s\" for all plugins\n",
787
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
free(pluginhelperenv);
273
795
for(plugin *p = plugin_list; p != NULL; p=p->next){
274
796
fprintf(stderr, "Plugin: %s has %d arguments\n",
276
798
for(char **a = p->argv; *a != NULL; a++){
277
799
fprintf(stderr, "\tArg: %s\n", *a);
801
fprintf(stderr, "...and %d environment variables\n", p->envc);
802
for(char **a = p->environ; *a != NULL; a++){
803
fprintf(stderr, "\t%s\n", *a);
809
/* Work around Debian bug #633582:
810
<https://bugs.debian.org/633582> */
811
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
812
if(plugindir_fd == -1){
814
error(0, errno, "open(\"" PDIR "\")");
817
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
819
error(0, errno, "fstat");
821
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
822
ret = fchown(plugindir_fd, uid, gid);
824
error(0, errno, "fchown");
832
/* Lower permissions */
835
error(0, errno, "setgid");
282
837
ret = setuid(uid);
292
dir = opendir(plugindir);
294
perror("Could not open plugin dir");
295
exitstatus = EXIT_FAILURE;
299
/* Set the FD_CLOEXEC flag on the directory, if possible */
839
error(0, errno, "setuid");
842
/* Open plugin directory with close_on_exec flag */
301
int dir_fd = dirfd(dir);
303
ret = set_cloexec_flag(dir_fd);
305
perror("set_cloexec_flag");
306
exitstatus = EXIT_FAILURE;
844
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#else /* not O_CLOEXEC */
849
#endif /* not O_CLOEXEC */
852
error(0, errno, "Could not open plugin dir");
853
exitstatus = EX_UNAVAILABLE;
858
/* Set the FD_CLOEXEC flag on the directory */
859
ret = set_cloexec_flag(dir_fd);
861
error(0, errno, "set_cloexec_flag");
862
exitstatus = EX_OSERR;
865
#endif /* O_CLOEXEC */
868
int good_name(const struct dirent * const dirent){
869
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
870
"*.dpkg-old", "*.dpkg-bak",
871
"*.dpkg-divert", NULL };
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, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirent->d_name, *pat);
893
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
if(numplugins == -1){
896
error(0, errno, "Could not scan plugin dir");
898
exitstatus = EX_OSERR;
312
902
FD_ZERO(&rfds_all);
315
dirst = readdir(dir);
317
// All directory entries have been processed
322
d_name_len = strlen(dirst->d_name);
324
// Ignore dotfiles, backup files and other junk
326
bool bad_name = false;
328
const char const *bad_prefixes[] = { ".", "#", NULL };
330
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
332
".dpkg-divert", NULL };
333
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
334
size_t pre_len = strlen(*pre);
335
if((d_name_len >= pre_len)
336
and strncmp((dirst->d_name), *pre, pre_len) == 0){
338
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
339
" with bad prefix %s\n", dirst->d_name, *pre);
350
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
351
size_t suf_len = strlen(*suf);
352
if((d_name_len >= suf_len)
353
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
356
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
357
" with bad suffix %s\n", dirst->d_name, *suf);
369
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
370
if (filename == NULL){
372
exitstatus = EXIT_FAILURE;
375
strcpy(filename, plugindir); /* Spurious warning */
376
strcat(filename, "/"); /* Spurious warning */
377
strcat(filename, dirst->d_name); /* Spurious warning */
381
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
904
/* Read and execute any executable in the plugin directory*/
905
for(int i = 0; i < numplugins; i++){
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
909
error(0, errno, "Could not open plugin");
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
915
error(0, errno, "stat");
921
/* Ignore non-executable files */
922
if(not S_ISREG(st.st_mode)
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
383
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
384
" with bad type or mode\n", filename);
926
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
927
" with bad type or mode\n",
928
plugindir != NULL ? plugindir : PDIR,
929
direntries[i]->d_name);
389
if(getplugin(dirst->d_name, &plugin_list)->disabled){
936
plugin *p = getplugin(direntries[i]->d_name);
938
error(0, errno, "getplugin");
391
945
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
946
direntries[i]->d_name);
397
plugin *p = getplugin(dirst->d_name, &plugin_list);
399
953
/* Add global arguments to argument list for this plugin */
400
plugin *g = getplugin(NULL, &plugin_list);
401
for(char **a = g->argv + 1; *a != NULL; a++){
409
exitstatus = EXIT_FAILURE;
954
plugin *g = getplugin(NULL);
956
for(char **a = g->argv + 1; *a != NULL; a++){
957
if(not add_argument(p, *a)){
958
error(0, errno, "add_argument");
961
/* Add global environment variables */
962
for(char **e = g->environ; *e != NULL; e++){
963
if(not add_environment(p, *e, false)){
964
error(0, errno, "add_environment");
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
971
if(p->environ[0] != NULL){
972
for(char **e = environ; *e != NULL; e++){
973
if(not add_environment(p, *e, false)){
974
error(0, errno, "add_environment");
981
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
982
#else /* O_CLOEXEC */
983
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
984
#endif /* O_CLOEXEC */
986
error(0, errno, "pipe");
987
exitstatus = EX_OSERR;
991
if(pipefd[0] >= FD_SETSIZE){
992
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
996
exitstatus = EX_OSERR;
1001
/* Ask OS to automatic close the pipe on exec */
412
1002
ret = set_cloexec_flag(pipefd[0]);
414
perror("set_cloexec_flag");
415
exitstatus = EXIT_FAILURE;
1004
error(0, errno, "set_cloexec_flag");
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
418
1011
ret = set_cloexec_flag(pipefd[1]);
420
perror("set_cloexec_flag");
421
exitstatus = EXIT_FAILURE;
1013
error(0, errno, "set_cloexec_flag");
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
1020
#endif /* not O_CLOEXEC */
424
1021
/* Block SIGCHLD until process is safely in process list */
425
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1023
&sigchld_action.sa_mask,
427
perror("sigprocmask");
428
exitstatus = EXIT_FAILURE;
431
// Starting a new process to be watched
1026
error(0, errno, "sigprocmask");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1031
/* Starting a new process to be watched */
1035
} while(pid == -1 and errno == EINTR);
1037
error(0, errno, "fork");
1038
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1039
&sigchld_action.sa_mask, NULL));
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
434
1047
/* this is the child process */
435
1048
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1050
error(0, errno, "sigaction");
440
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
442
perror("sigprocmask");
445
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
448
/* If dir has no file descriptor, we could not set FD_CLOEXEC
449
above and must now close it manually here. */
452
if(execv(filename, p->argv) < 0){
1055
error(0, errno, "sigprocmask");
1059
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1061
error(0, errno, "dup2");
1065
if(fexecve(plugin_fd, p->argv,
1066
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1067
error(0, errno, "fexecve for %s/%s",
1068
plugindir != NULL ? plugindir : PDIR,
1069
direntries[i]->d_name);
460
close(pipefd[1]); /* close unused write end of pipe */
461
process *new_process = malloc(sizeof(process));
462
if (new_process == NULL){
464
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1074
/* Parent process */
1075
close(pipefd[1]); /* Close unused write end of pipe */
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
1078
if(new_plugin == NULL){
1079
error(0, errno, "getplugin");
1080
ret = (int)(TEMP_FAILURE_RETRY
1081
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
466
perror("sigprocmask");
1084
error(0, errno, "sigprocmask");
468
exitstatus = EXIT_FAILURE;
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
472
*new_process = (struct process){ .pid = pid,
474
.next = process_list };
476
process_list = new_process;
1090
free(direntries[i]);
1092
new_plugin->pid = pid;
1093
new_plugin->fd = pipefd[0];
477
1095
/* Unblock SIGCHLD so signal handler can be run if this process
478
1096
has already completed */
479
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1097
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1098
&sigchld_action.sa_mask,
481
perror("sigprocmask");
482
exitstatus = EXIT_FAILURE;
486
FD_SET(new_process->fd, &rfds_all);
488
if (maxfd < new_process->fd){
489
maxfd = new_process->fd;
494
/* Free the plugin list */
495
for(plugin *next; plugin_list != NULL; plugin_list = next){
496
next = plugin_list->next;
497
free(plugin_list->argv);
504
if (process_list == NULL){
505
fprintf(stderr, "No plugin processes started, exiting\n");
506
exitstatus = EXIT_FAILURE;
1101
error(0, errno, "sigprocmask");
1102
exitstatus = EX_OSERR;
1106
FD_SET(new_plugin->fd, &rfds_all);
1108
if(maxfd < new_plugin->fd){
1109
maxfd = new_plugin->fd;
1117
free_plugin(getplugin(NULL));
1119
for(plugin *p = plugin_list; p != NULL; p = p->next){
1123
if(p->next == NULL){
1124
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1130
/* Main loop while running plugins exist */
510
1132
fd_set rfds = rfds_all;
511
1133
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
512
if (select_ret == -1){
514
exitstatus = EXIT_FAILURE;
1134
if(select_ret == -1 and errno != EINTR){
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
517
1139
/* OK, now either a process completed, or something can be read
518
1140
from one of them */
519
for(process *proc = process_list; proc ; proc = proc->next){
1141
for(plugin *proc = plugin_list; proc != NULL;){
520
1142
/* Is this process completely done? */
521
if(proc->eof and proc->completed){
1143
if(proc->completed and proc->eof){
522
1144
/* Only accept the plugin output if it exited cleanly */
523
1145
if(not WIFEXITED(proc->status)
524
1146
or WEXITSTATUS(proc->status) != 0){
525
1147
/* Bad exit by plugin */
527
1150
if(WIFEXITED(proc->status)){
528
fprintf(stderr, "Plugin %d exited with status %d\n",
529
proc->pid, WEXITSTATUS(proc->status));
530
} else if(WIFSIGNALED(proc->status)) {
531
fprintf(stderr, "Plugin %d killed by signal %d\n",
532
proc->pid, WTERMSIG(proc->status));
533
} else if(WCOREDUMP(proc->status)){
534
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
1151
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1152
" status %d\n", proc->name,
1153
(intmax_t) (proc->pid),
1154
WEXITSTATUS(proc->status));
1155
} else if(WIFSIGNALED(proc->status)){
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1157
" signal %d: %s\n", proc->name,
1158
(intmax_t) (proc->pid),
1159
WTERMSIG(proc->status),
1160
strsignal(WTERMSIG(proc->status)));
537
1164
/* Remove the plugin */
538
1165
FD_CLR(proc->fd, &rfds_all);
539
1167
/* Block signal while modifying process_list */
540
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1170
&sigchld_action.sa_mask,
542
perror("sigprocmask");
543
exitstatus = EXIT_FAILURE;
546
/* Delete this process entry from the list */
547
if(process_list == proc){
548
/* First one - simple */
549
process_list = proc->next;
551
/* Second one or later */
552
for(process *p = process_list; p != NULL; p = p->next){
554
p->next = proc->next;
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
1178
plugin *next_plugin = proc->next;
559
1182
/* We are done modifying process list, so unblock signal */
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1183
ret = (int)(TEMP_FAILURE_RETRY
1184
(sigprocmask(SIG_UNBLOCK,
1185
&sigchld_action.sa_mask, NULL)));
563
perror("sigprocmask");
567
/* We deleted this process from the list, so we can't go
568
proc->next. Therefore, start over from the beginning of
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1192
if(plugin_list == NULL){
572
1199
/* This process exited nicely, so print its buffer */
573
for(size_t written = 0; written < proc->buffer_length;
574
written += (size_t)ret){
575
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
576
proc->buffer + written,
581
exitstatus = EXIT_FAILURE;
1201
bool bret = print_out_password(proc->buffer,
1202
proc->buffer_length);
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
587
1210
/* This process has not completed. Does it have any output? */
588
1211
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
589
1212
/* This process had nothing to say at this time */
592
1216
/* Before reading, make the process' data buffer large enough */
593
1217
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
594
proc->buffer = realloc(proc->buffer, proc->buffer_size
595
+ (size_t) BUFFER_SIZE);
596
if (proc->buffer == NULL){
598
exitstatus = EXIT_FAILURE;
1218
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1219
+ (size_t) BUFFER_SIZE);
1220
if(new_buffer == NULL){
1221
error(0, errno, "malloc");
1222
exitstatus = EX_OSERR;
1225
proc->buffer = new_buffer;
601
1226
proc->buffer_size += BUFFER_SIZE;
603
1228
/* Read from the process */
604
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1229
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1231
+ proc->buffer_length,
607
1234
/* Read error from this process; ignore the error */
612
1240
proc->eof = true;
614
proc->buffer_length += (size_t) ret;
1242
proc->buffer_length += (size_t) sret;
618
if(process_list == NULL){
619
fprintf(stderr, "All plugin processes failed, exiting\n");
620
exitstatus = EXIT_FAILURE;
1250
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1251
and exitstatus != EX_OK)){
1252
/* Fallback if all plugins failed, none are found or an error
1255
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1256
char *passwordbuffer = getpass("Password: ");
1257
size_t len = strlen(passwordbuffer);
1258
/* Strip trailing newline */
1259
if(len > 0 and passwordbuffer[len-1] == '\n'){
1260
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1263
bret = print_out_password(passwordbuffer, len);
1265
error(0, errno, "print_out_password");
1266
exitstatus = EX_IOERR;
624
1270
/* Restore old signal handler */
625
sigaction(SIGCHLD, &old_sigchld_action, NULL);
627
/* Free the plugin list */
628
for(plugin *next; plugin_list != NULL; plugin_list = next){
629
next = plugin_list->next;
630
free(plugin_list->argv);
638
/* Free the process list and kill the processes */
639
for(process *next; process_list != NULL; process_list = next){
640
next = process_list->next;
641
close(process_list->fd);
642
kill(process_list->pid, SIGTERM);
643
free(process_list->buffer);
1271
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1273
error(0, errno, "sigaction");
1274
exitstatus = EX_OSERR;
1277
if(custom_argv != NULL){
1278
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1290
/* Kill the processes */
1291
for(plugin *p = plugin_list; p != NULL; p = p->next){
1294
ret = kill(p->pid, SIGTERM);
1295
if(ret == -1 and errno != ESRCH){
1296
/* Set-uid proccesses might not get closed */
1297
error(0, errno, "kill");
647
1302
/* Wait for any remaining child processes to terminate */
649
1304
ret = wait(NULL);
650
1305
} while(ret >= 0);
651
1306
if(errno != ECHILD){
1307
error(0, errno, "wait");
1313
free(pluginhelperdir);
655
1316
return exitstatus;