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() */
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strsep, strlen(), strcpy(),
53
FD_CLOEXEC, openat(), scandirat(),
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
56
57
#include <errno.h> /* errno */
57
58
#include <argp.h> /* struct argp_option, struct
58
59
argp_state, struct argp,
59
60
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
ARGP_KEY_END, ARGP_KEY_ARG,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
67
76
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugins.conf"
70
const char *argp_program_version = "plugin-runner 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
typedef struct process{
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
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*/
79
97
size_t buffer_size;
80
98
size_t buffer_length;
100
volatile sig_atomic_t completed;
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
92
102
struct plugin *next;
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
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))){
102
118
/* Create a new plugin */
103
plugin *new_plugin = malloc(sizeof(plugin));
104
if (new_plugin == NULL){
108
new_plugin->name = name;
109
new_plugin->argv = malloc(sizeof(char *) * 2);
110
if (new_plugin->argv == NULL){
114
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;
115
155
new_plugin->argv[1] = NULL;
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
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;
119
170
/* Append the new plugin to the list */
120
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
121
172
return new_plugin;
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
132
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));
136
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
137
247
* Descriptor Flags".
138
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
140
static int set_cloexec_flag(int fd)
142
int ret = fcntl(fd, F_GETFD, 0);
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
143
253
/* If reading the flags failed, return error indication now. */
147
257
/* Store modified flag word in the descriptor. */
148
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
151
process *process_list = NULL;
153
/* Mark a process as completed when it exits, and save its exit
261
#endif /* not O_CLOEXEC */
264
/* Mark processes as completed when they exit, and save their exit
155
void handle_sigchld(__attribute__((unused)) int sig){
156
process *proc = process_list;
158
pid_t pid = wait(&status);
163
while(proc != NULL and proc->pid != pid){
167
/* Process not found in process list */
170
proc->status = status;
171
proc->completed = true;
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
269
plugin *proc = plugin_list;
271
pid_t pid = waitpid(-1, &status, WNOHANG);
273
/* Only still running child processes */
278
/* No child processes */
281
error(0, errno, "waitpid");
284
/* A child exited, find it in process_list */
285
while(proc != NULL and proc->pid != pid){
289
/* Process not found in process list */
292
proc->status = status;
174
bool print_out_password(const char *buffer, size_t length){
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
176
if(length>0 and buffer[length-1] == '\n'){
179
302
for(size_t written = 0; written < length; written += (size_t)ret){
180
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
181
304
length - written));
246
387
{ .name = "global-options", .key = 'g',
247
388
.arg = "OPTION[,OPTION[,...]]",
248
389
.doc = "Options passed to all plugins" },
390
{ .name = "global-env", .key = 'G',
392
.doc = "Environment variable passed to all plugins" },
249
393
{ .name = "options-for", .key = 'o',
250
394
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
251
395
.doc = "Options passed only to specified plugin" },
396
{ .name = "env-for", .key = 'E',
397
.arg = "PLUGIN:ENV=value",
398
.doc = "Environment variable passed to specified plugin" },
252
399
{ .name = "disable", .key = 'd',
254
401
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
404
.doc = "Enable a specific plugin", .group = 1 },
255
405
{ .name = "plugin-dir", .key = 128,
256
406
.arg = "DIRECTORY",
257
407
.doc = "Specify a different plugin directory", .group = 2 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.doc = "Debug mode", .group = 3 },
408
{ .name = "config-file", .key = 129,
410
.doc = "Specify a different configuration file", .group = 2 },
411
{ .name = "userid", .key = 130,
412
.arg = "ID", .flags = 0,
413
.doc = "User ID the plugins will run as", .group = 3 },
414
{ .name = "groupid", .key = 131,
415
.arg = "ID", .flags = 0,
416
.doc = "Group ID the plugins will run as", .group = 3 },
417
{ .name = "debug", .key = 132,
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
421
.doc = "Specify a different plugin helper directory",
424
* These reproduce what we would get without ARGP_NO_HELP
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
277
while((p = strsep(&arg, ",")) != NULL){
281
addargument(getplugin(NULL, plugins), p);
287
char *name = strsep(&arg, ":");
291
char *opt = strsep(&arg, ":");
297
while((p = strsep(&opt, ",")) != NULL){
301
addargument(getplugin(name, plugins), p);
308
getplugin(arg, plugins)->disabled = true;
315
uid = (uid_t)strtol(arg, NULL, 10);
318
gid = (gid_t)strtol(arg, NULL, 10);
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
441
case 'g': /* --global-options */
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
452
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
457
case 'o': /* --options-for */
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
468
argp_error(state, "Empty plugin name");
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
481
case 'E': /* --env-for */
483
char *envdef = strchr(arg, ':');
485
argp_error(state, "No colon in \"%s\"", arg);
492
argp_error(state, "Empty plugin name");
496
if(add_environment(getplugin(arg), envdef, true)){
501
case 'd': /* --disable */
503
plugin *p = getplugin(arg);
510
case 'e': /* --enable */
512
plugin *p = getplugin(arg);
519
case 128: /* --plugin-dir */
521
plugindir = strdup(arg);
522
if(plugindir != NULL){
526
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
529
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
540
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
551
case 132: /* --debug */
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
329
return ARGP_ERR_UNKNOWN;
334
plugin *plugin_list = NULL;
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
562
* These reproduce what we would get without ARGP_NO_HELP
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
587
return ARGP_ERR_UNKNOWN;
589
return errno; /* Set to 0 at start */
592
/* This option parser is the same as parse_opt() above, except it
593
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
599
case 'g': /* --global-options */
600
case 'G': /* --global-env */
601
case 'o': /* --options-for */
602
case 'E': /* --env-for */
603
case 'd': /* --disable */
604
case 'e': /* --enable */
605
case 128: /* --plugin-dir */
607
case 129: /* --config-file */
609
argfile = strdup(arg);
614
case 130: /* --userid */
615
case 131: /* --groupid */
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
624
return ARGP_ERR_UNKNOWN;
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
338
632
.doc = "Mandos plugin runner -- Run plugins" };
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
341
if (ret == ARGP_ERR_UNKNOWN){
342
fprintf(stderr, "Unknown error while parsing arguments\n");
343
exitstatus = EXIT_FAILURE;
347
conffp = fopen(argfile, "r");
634
/* Parse using parse_opt_config_file() in order to get the custom
635
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
649
exitstatus = EX_USAGE;
653
/* Reset to the normal argument parser */
654
argp.parser = parse_opt;
656
/* Open the configfile if available */
658
conffp = fopen(AFILE, "r");
660
conffp = fopen(argfile, "r");
348
662
if(conffp != NULL){
349
663
char *org_line = NULL;
664
char *p, *arg, *new_arg, *line;
352
char *p, *arg, *new_arg, *line;
353
666
const char whitespace_delims[] = " \r\t\f\v\n";
354
667
const char comment_delim[] = "#";
670
custom_argv = malloc(sizeof(char*) * 2);
671
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
676
custom_argv[0] = argv[0];
677
custom_argv[1] = NULL;
679
/* for each line in the config file, strip whitespace and ignore
357
682
sret = getline(&org_line, &size, conffp);
363
688
arg = strsep(&line, comment_delim);
364
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
402
800
for(char **a = p->argv; *a != NULL; a++){
403
801
fprintf(stderr, "\tArg: %s\n", *a);
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
804
for(char **a = p->environ; *a != NULL; a++){
805
fprintf(stderr, "\t%s\n", *a);
811
/* Work around Debian bug #633582:
812
<http://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
816
error(0, errno, "open(\"" PDIR "\")");
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
821
error(0, errno, "fstat");
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
826
error(0, errno, "fchown");
830
TEMP_FAILURE_RETRY(close(plugindir_fd));
834
/* Lower permissions */
837
error(0, errno, "setgid");
408
839
ret = setuid(uid);
418
dir = opendir(plugindir);
420
perror("Could not open plugin dir");
421
exitstatus = EXIT_FAILURE;
425
/* Set the FD_CLOEXEC flag on the directory, if possible */
841
error(0, errno, "setuid");
844
/* Open plugin directory with close_on_exec flag */
427
int dir_fd = dirfd(dir);
429
ret = set_cloexec_flag(dir_fd);
431
perror("set_cloexec_flag");
432
exitstatus = EXIT_FAILURE;
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
849
#else /* not O_CLOEXEC */
851
#endif /* not O_CLOEXEC */
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
867
#endif /* O_CLOEXEC */
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
881
#pragma GCC diagnostic pop
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
896
#if __GLIBC_PREREQ(2, 15)
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
899
#else /* not __GLIBC_PREREQ(2, 15) */
900
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
901
&direntries, good_name, alphasort);
902
#endif /* not __GLIBC_PREREQ(2, 15) */
903
#else /* not __GLIBC__ */
904
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
905
&direntries, good_name, alphasort);
906
#endif /* not __GLIBC__ */
907
if(numplugins == -1){
908
error(0, errno, "Could not scan plugin dir");
910
exitstatus = EX_OSERR;
438
914
FD_ZERO(&rfds_all);
441
dirst = readdir(dir);
443
// All directory entries have been processed
447
exitstatus = EXIT_FAILURE;
453
d_name_len = strlen(dirst->d_name);
455
// Ignore dotfiles, backup files and other junk
457
bool bad_name = false;
459
const char const *bad_prefixes[] = { ".", "#", NULL };
461
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
463
".dpkg-divert", NULL };
464
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
465
size_t pre_len = strlen(*pre);
466
if((d_name_len >= pre_len)
467
and strncmp((dirst->d_name), *pre, pre_len) == 0){
469
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
470
" with bad prefix %s\n", dirst->d_name, *pre);
481
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
482
size_t suf_len = strlen(*suf);
483
if((d_name_len >= suf_len)
484
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
487
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
488
" with bad suffix %s\n", dirst->d_name, *suf);
500
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
501
if (filename == NULL){
505
strcpy(filename, plugindir); /* Spurious warning */
506
strcat(filename, "/"); /* Spurious warning */
507
strcat(filename, dirst->d_name); /* Spurious warning */
509
ret = stat(filename, &st);
516
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
916
/* Read and execute any executable in the plugin directory*/
917
for(int i = 0; i < numplugins; i++){
919
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
921
error(0, errno, "Could not open plugin");
925
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
927
error(0, errno, "stat");
928
TEMP_FAILURE_RETRY(close(plugin_fd));
933
/* Ignore non-executable files */
934
if(not S_ISREG(st.st_mode)
935
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
518
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
519
" with bad type or mode\n", filename);
938
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
939
" with bad type or mode\n",
940
plugindir != NULL ? plugindir : PDIR,
941
direntries[i]->d_name);
524
if(getplugin(dirst->d_name, &plugin_list)->disabled){
943
TEMP_FAILURE_RETRY(close(plugin_fd));
948
plugin *p = getplugin(direntries[i]->d_name);
950
error(0, errno, "getplugin");
951
TEMP_FAILURE_RETRY(close(plugin_fd));
526
957
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
958
direntries[i]->d_name);
960
TEMP_FAILURE_RETRY(close(plugin_fd));
532
plugin *p = getplugin(dirst->d_name, &plugin_list);
534
965
/* Add global arguments to argument list for this plugin */
535
plugin *g = getplugin(NULL, &plugin_list);
536
for(char **a = g->argv + 1; *a != NULL; a++){
544
exitstatus = EXIT_FAILURE;
966
plugin *g = getplugin(NULL);
968
for(char **a = g->argv + 1; *a != NULL; a++){
969
if(not add_argument(p, *a)){
970
error(0, errno, "add_argument");
973
/* Add global environment variables */
974
for(char **e = g->environ; *e != NULL; e++){
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
981
/* If this plugin has any environment variables, we need to
982
duplicate the environment from this process, too. */
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");
993
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
994
#else /* O_CLOEXEC */
995
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
996
#endif /* O_CLOEXEC */
998
error(0, errno, "pipe");
999
exitstatus = EX_OSERR;
1000
free(direntries[i]);
1003
if(pipefd[0] >= FD_SETSIZE){
1004
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1006
TEMP_FAILURE_RETRY(close(pipefd[0]));
1007
TEMP_FAILURE_RETRY(close(pipefd[1]));
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
1013
/* Ask OS to automatic close the pipe on exec */
547
1014
ret = set_cloexec_flag(pipefd[0]);
549
perror("set_cloexec_flag");
550
exitstatus = EXIT_FAILURE;
1016
error(0, errno, "set_cloexec_flag");
1017
TEMP_FAILURE_RETRY(close(pipefd[0]));
1018
TEMP_FAILURE_RETRY(close(pipefd[1]));
1019
exitstatus = EX_OSERR;
1020
free(direntries[i]);
553
1023
ret = set_cloexec_flag(pipefd[1]);
555
perror("set_cloexec_flag");
556
exitstatus = EXIT_FAILURE;
1025
error(0, errno, "set_cloexec_flag");
1026
TEMP_FAILURE_RETRY(close(pipefd[0]));
1027
TEMP_FAILURE_RETRY(close(pipefd[1]));
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
1032
#endif /* not O_CLOEXEC */
559
1033
/* Block SIGCHLD until process is safely in process list */
560
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1035
&sigchld_action.sa_mask,
562
perror("sigprocmask");
563
exitstatus = EXIT_FAILURE;
1038
error(0, errno, "sigprocmask");
1039
exitstatus = EX_OSERR;
1040
free(direntries[i]);
566
// Starting a new process to be watched
1043
/* Starting a new process to be watched */
1047
} while(pid == -1 and errno == EINTR);
570
exitstatus = EXIT_FAILURE;
1049
error(0, errno, "fork");
1050
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL));
1052
TEMP_FAILURE_RETRY(close(pipefd[0]));
1053
TEMP_FAILURE_RETRY(close(pipefd[1]));
1054
exitstatus = EX_OSERR;
1055
free(direntries[i]);
574
1059
/* this is the child process */
575
1060
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1062
error(0, errno, "sigaction");
580
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
582
perror("sigprocmask");
1067
error(0, errno, "sigprocmask");
586
1071
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1073
error(0, errno, "dup2");
593
/* If dir has no file descriptor, we could not set FD_CLOEXEC
594
above and must now close it manually here. */
597
if(execv(filename, p->argv) < 0){
1077
if(fexecve(plugin_fd, p->argv,
1078
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1079
error(0, errno, "fexecve for %s/%s",
1080
plugindir != NULL ? plugindir : PDIR,
1081
direntries[i]->d_name);
605
close(pipefd[1]); /* close unused write end of pipe */
606
process *new_process = malloc(sizeof(process));
607
if (new_process == NULL){
609
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1086
/* Parent process */
1087
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1089
TEMP_FAILURE_RETRY(close(plugin_fd));
1090
plugin *new_plugin = getplugin(direntries[i]->d_name);
1091
if(new_plugin == NULL){
1092
error(0, errno, "getplugin");
1093
ret = (int)(TEMP_FAILURE_RETRY
1094
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
611
perror("sigprocmask");
1097
error(0, errno, "sigprocmask");
613
exitstatus = EXIT_FAILURE;
1099
exitstatus = EX_OSERR;
1100
free(direntries[i]);
617
*new_process = (struct process){ .pid = pid,
619
.next = process_list };
621
process_list = new_process;
1103
free(direntries[i]);
1105
new_plugin->pid = pid;
1106
new_plugin->fd = pipefd[0];
622
1108
/* Unblock SIGCHLD so signal handler can be run if this process
623
1109
has already completed */
624
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1110
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1111
&sigchld_action.sa_mask,
626
perror("sigprocmask");
627
exitstatus = EXIT_FAILURE;
631
FD_SET(new_process->fd, &rfds_all);
633
if (maxfd < new_process->fd){
634
maxfd = new_process->fd;
639
/* Free the plugin list */
640
for(plugin *next; plugin_list != NULL; plugin_list = next){
641
next = plugin_list->next;
642
free(plugin_list->argv);
649
if (process_list == NULL){
650
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1114
error(0, errno, "sigprocmask");
1115
exitstatus = EX_OSERR;
1119
#if defined (__GNUC__) and defined (__GLIBC__)
1120
#if not __GLIBC_PREREQ(2, 16)
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wsign-conversion"
1125
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1126
-Wconversion in GNU libc
1128
#if defined (__GNUC__) and defined (__GLIBC__)
1129
#if not __GLIBC_PREREQ(2, 16)
1130
#pragma GCC diagnostic pop
1134
if(maxfd < new_plugin->fd){
1135
maxfd = new_plugin->fd;
1141
TEMP_FAILURE_RETRY(close(dir_fd));
1143
free_plugin(getplugin(NULL));
1145
for(plugin *p = plugin_list; p != NULL; p = p->next){
1149
if(p->next == NULL){
1150
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1156
/* Main loop while running plugins exist */
655
1158
fd_set rfds = rfds_all;
656
1159
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
657
if (select_ret == -1){
659
exitstatus = EXIT_FAILURE;
1160
if(select_ret == -1 and errno != EINTR){
1161
error(0, errno, "select");
1162
exitstatus = EX_OSERR;
662
1165
/* OK, now either a process completed, or something can be read
663
1166
from one of them */
664
for(process *proc = process_list; proc ; proc = proc->next){
1167
for(plugin *proc = plugin_list; proc != NULL;){
665
1168
/* Is this process completely done? */
666
if(proc->eof and proc->completed){
1169
if(proc->completed and proc->eof){
667
1170
/* Only accept the plugin output if it exited cleanly */
668
1171
if(not WIFEXITED(proc->status)
669
1172
or WEXITSTATUS(proc->status) != 0){
670
1173
/* Bad exit by plugin */
672
1176
if(WIFEXITED(proc->status)){
673
fprintf(stderr, "Plugin %u exited with status %d\n",
674
(unsigned int) (proc->pid),
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1178
" status %d\n", proc->name,
1179
(intmax_t) (proc->pid),
675
1180
WEXITSTATUS(proc->status));
676
} else if(WIFSIGNALED(proc->status)) {
677
fprintf(stderr, "Plugin %u killed by signal %d\n",
678
(unsigned int) (proc->pid),
679
WTERMSIG(proc->status));
1181
} else if(WIFSIGNALED(proc->status)){
1182
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1183
" signal %d: %s\n", proc->name,
1184
(intmax_t) (proc->pid),
1185
WTERMSIG(proc->status),
1186
strsignal(WTERMSIG(proc->status)));
680
1187
} else if(WCOREDUMP(proc->status)){
681
fprintf(stderr, "Plugin %d dumped core\n",
682
(unsigned int) (proc->pid));
1188
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1189
" core\n", proc->name, (intmax_t) (proc->pid));
685
1193
/* Remove the plugin */
686
FD_CLR(proc->fd, &rfds_all);
1194
#if defined (__GNUC__) and defined (__GLIBC__)
1195
#if not __GLIBC_PREREQ(2, 16)
1196
#pragma GCC diagnostic push
1197
#pragma GCC diagnostic ignored "-Wsign-conversion"
1200
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1201
-Wconversion in GNU libc
1203
#if defined (__GNUC__) and defined (__GLIBC__)
1204
#if not __GLIBC_PREREQ(2, 16)
1205
#pragma GCC diagnostic pop
687
1209
/* Block signal while modifying process_list */
688
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1210
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1212
&sigchld_action.sa_mask,
690
perror("sigprocmask");
691
exitstatus = EXIT_FAILURE;
694
/* Delete this process entry from the list */
695
if(process_list == proc){
696
/* First one - simple */
697
process_list = proc->next;
699
/* Second one or later */
700
for(process *p = process_list; p != NULL; p = p->next){
702
p->next = proc->next;
1215
error(0, errno, "sigprocmask");
1216
exitstatus = EX_OSERR;
1220
plugin *next_plugin = proc->next;
707
1224
/* We are done modifying process list, so unblock signal */
708
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1225
ret = (int)(TEMP_FAILURE_RETRY
1226
(sigprocmask(SIG_UNBLOCK,
1227
&sigchld_action.sa_mask, NULL)));
711
perror("sigprocmask");
715
/* We deleted this process from the list, so we can't go
716
proc->next. Therefore, start over from the beginning of
1229
error(0, errno, "sigprocmask");
1230
exitstatus = EX_OSERR;
1234
if(plugin_list == NULL){
720
1241
/* This process exited nicely, so print its buffer */
722
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1243
bool bret = print_out_password(proc->buffer,
1244
proc->buffer_length);
724
perror("print_out_password");
725
exitstatus = EXIT_FAILURE;
1246
error(0, errno, "print_out_password");
1247
exitstatus = EX_IOERR;
729
1252
/* This process has not completed. Does it have any output? */
730
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1253
#if defined (__GNUC__) and defined (__GLIBC__)
1254
#if not __GLIBC_PREREQ(2, 16)
1255
#pragma GCC diagnostic push
1256
#pragma GCC diagnostic ignored "-Wsign-conversion"
1259
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1265
#if defined (__GNUC__) and defined (__GLIBC__)
1266
#if not __GLIBC_PREREQ(2, 16)
1267
#pragma GCC diagnostic pop
731
1270
/* This process had nothing to say at this time */
734
1274
/* Before reading, make the process' data buffer large enough */
735
1275
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
736
proc->buffer = realloc(proc->buffer, proc->buffer_size
737
+ (size_t) BUFFER_SIZE);
738
if (proc->buffer == NULL){
740
exitstatus = EXIT_FAILURE;
1276
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1277
+ (size_t) BUFFER_SIZE);
1278
if(new_buffer == NULL){
1279
error(0, errno, "malloc");
1280
exitstatus = EX_OSERR;
1283
proc->buffer = new_buffer;
743
1284
proc->buffer_size += BUFFER_SIZE;
745
1286
/* Read from the process */
746
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1287
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1289
+ proc->buffer_length,
749
1292
/* Read error from this process; ignore the error */
754
1298
proc->eof = true;
756
proc->buffer_length += (size_t) ret;
1300
proc->buffer_length += (size_t) sret;
764
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
765
/* Fallback if all plugins failed, none are found or an error occured */
1308
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1309
and exitstatus != EX_OK)){
1310
/* Fallback if all plugins failed, none are found or an error
767
1313
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
768
1314
char *passwordbuffer = getpass("Password: ");
769
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1315
size_t len = strlen(passwordbuffer);
1316
/* Strip trailing newline */
1317
if(len > 0 and passwordbuffer[len-1] == '\n'){
1318
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1321
bret = print_out_password(passwordbuffer, len);
771
perror("print_out_password");
772
exitstatus = EXIT_FAILURE;
1323
error(0, errno, "print_out_password");
1324
exitstatus = EX_IOERR;
777
1328
/* Restore old signal handler */
778
sigaction(SIGCHLD, &old_sigchld_action, NULL);
782
/* Free the plugin list */
783
for(plugin *next; plugin_list != NULL; plugin_list = next){
784
next = plugin_list->next;
785
free(plugin_list->argv);
793
/* Free the process list and kill the processes */
794
for(process *next; process_list != NULL; process_list = next){
795
next = process_list->next;
796
close(process_list->fd);
797
ret = kill(process_list->pid, SIGTERM);
798
if(ret == -1 and errno != ESRCH){
799
/* set-uid proccesses migth not get closed */
802
free(process_list->buffer);
1329
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1331
error(0, errno, "sigaction");
1332
exitstatus = EX_OSERR;
1335
if(custom_argv != NULL){
1336
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1345
TEMP_FAILURE_RETRY(close(dir_fd));
1348
/* Kill the processes */
1349
for(plugin *p = plugin_list; p != NULL; p = p->next){
1352
ret = kill(p->pid, SIGTERM);
1353
if(ret == -1 and errno != ESRCH){
1354
/* Set-uid proccesses might not get closed */
1355
error(0, errno, "kill");
806
1360
/* Wait for any remaining child processes to terminate */
808
1362
ret = wait(NULL);
809
1363
} while(ret >= 0);
810
1364
if(errno != ECHILD){
1365
error(0, errno, "wait");
1371
free(pluginhelperdir);
814
1374
return exitstatus;