37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strsep, strlen(), strcpy(),
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
59
61
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
ARGP_KEY_END, ARGP_KEY_ARG,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
65
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() */
67
76
#define BUFFER_SIZE 256
69
const char *argp_program_version = "mandos-client 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
typedef struct process{
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
84
typedef struct plugin{
85
char *name; /* can be NULL or any plugin name */
92
/* Variables used for running processes*/
78
96
size_t buffer_size;
79
97
size_t buffer_length;
99
volatile sig_atomic_t completed;
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
91
101
struct plugin *next;
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
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
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
or (p->name and name and (strcmp(p->name, name) == 0))){
101
116
/* Create a new plugin */
102
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
107
new_plugin->name = name;
108
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
113
new_plugin->argv[0] = name;
117
plugin *new_plugin = NULL;
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
124
char *copy_name = NULL;
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
129
if(copy_name == NULL){
137
*new_plugin = (plugin){ .name = copy_name,
140
.next = plugin_list };
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
152
new_plugin->argv[0] = copy_name;
114
153
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
158
if(new_plugin->environ == NULL){
161
free(new_plugin->argv);
166
new_plugin->environ[0] = NULL;
118
168
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
169
plugin_list = new_plugin;
120
170
return new_plugin;
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
131
p->argv[p->argc] = NULL;
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
static bool add_to_char_array(const char *new, char ***array,
177
/* Resize the pointed-to array to hold one more pointer */
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
186
/* Make a copy of the new string */
190
} while(copy == NULL and errno == EINTR);
194
/* Insert the copy */
195
(*array)[*len] = copy;
197
/* Add a new terminating NULL pointer to the last element */
198
(*array)[*len] = NULL;
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
static bool add_argument(plugin *p, const char *arg){
208
return add_to_char_array(arg, &(p->argv), &(p->argc));
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
static bool add_environment(plugin *p, const char *def, bool replace){
217
/* namelen = length of name of environment variable */
218
size_t namelen = (size_t)(strchrnul(def, '=') - def);
219
/* Search for this environment variable */
220
for(char **e = p->environ; *e != NULL; e++){
221
if(strncmp(*e, def, namelen + 1) == 0){
222
/* It already exists */
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
237
return add_to_char_array(def, &(p->environ), &(p->envc));
135
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
136
242
* Descriptor Flags".
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
139
static int set_cloexec_flag(int fd)
141
int ret = fcntl(fd, F_GETFD, 0);
245
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
142
247
/* If reading the flags failed, return error indication now. */
146
251
/* Store modified flag word in the descriptor. */
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
150
process *process_list = NULL;
152
/* Mark a process as completed when it exits, and save its exit
257
/* Mark processes as completed when they exit, and save their exit
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
157
pid_t pid = wait(&status);
162
while(proc != NULL and proc->pid != pid){
166
/* Process not found in process list */
169
proc->status = status;
170
proc->completed = true;
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
262
plugin *proc = plugin_list;
264
pid_t pid = waitpid(-1, &status, WNOHANG);
266
/* Only still running child processes */
271
/* No child processes */
274
error(0, errno, "waitpid");
277
/* A child exited, find it in process_list */
278
while(proc != NULL and proc->pid != pid){
282
/* Process not found in process list */
285
proc->status = status;
173
bool print_out_password(const char *buffer, size_t length){
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
static bool print_out_password(const char *buffer, size_t length){
175
if(length>0 and buffer[length-1] == '\n'){
178
295
for(size_t written = 0; written < length; written += (size_t)ret){
179
296
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
297
length - written));
221
380
{ .name = "global-options", .key = 'g',
222
381
.arg = "OPTION[,OPTION[,...]]",
223
382
.doc = "Options passed to all plugins" },
383
{ .name = "global-env", .key = 'G',
385
.doc = "Environment variable passed to all plugins" },
224
386
{ .name = "options-for", .key = 'o',
225
387
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
388
.doc = "Options passed only to specified plugin" },
389
{ .name = "env-for", .key = 'E',
390
.arg = "PLUGIN:ENV=value",
391
.doc = "Environment variable passed to specified plugin" },
227
392
{ .name = "disable", .key = 'd',
229
394
.doc = "Disable a specific plugin", .group = 1 },
395
{ .name = "enable", .key = 'e',
397
.doc = "Enable a specific plugin", .group = 1 },
230
398
{ .name = "plugin-dir", .key = 128,
231
399
.arg = "DIRECTORY",
232
400
.doc = "Specify a different plugin directory", .group = 2 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
401
{ .name = "config-file", .key = 129,
403
.doc = "Specify a different configuration file", .group = 2 },
404
{ .name = "userid", .key = 130,
405
.arg = "ID", .flags = 0,
406
.doc = "User ID the plugins will run as", .group = 3 },
407
{ .name = "groupid", .key = 131,
408
.arg = "ID", .flags = 0,
409
.doc = "Group ID the plugins will run as", .group = 3 },
410
{ .name = "debug", .key = 132,
411
.doc = "Debug mode", .group = 4 },
413
* These reproduce what we would get without ARGP_NO_HELP
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
252
while((p = strsep(&arg, ",")) != NULL){
253
if(strcmp(p, "") == 0){
256
addargument(getplugin(NULL, plugins), p);
262
char *name = strsep(&arg, ":");
263
if(strcmp(name, "") == 0){
266
char *opt = strsep(&arg, ":");
267
if(strcmp(opt, "") == 0){
272
while((p = strsep(&opt, ",")) != NULL){
273
if(strcmp(p, "") == 0){
276
addargument(getplugin(name, plugins), p);
283
getplugin(arg, plugins)->disabled = true;
290
uid = (uid_t)strtol(arg, NULL, 10);
293
gid = (gid_t)strtol(arg, NULL, 10);
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
430
case 'g': /* --global-options */
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
440
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
443
case 'o': /* --options-for */
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
454
argp_error(state, "Empty plugin name");
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
466
case 'E': /* --env-for */
468
char *envdef = strchr(arg, ':');
470
argp_error(state, "No colon in \"%s\"", arg);
477
argp_error(state, "Empty plugin name");
481
add_environment(getplugin(arg), envdef, true);
484
case 'd': /* --disable */
486
plugin *p = getplugin(arg);
492
case 'e': /* --enable */
494
plugin *p = getplugin(arg);
500
case 128: /* --plugin-dir */
502
plugindir = strdup(arg);
504
case 129: /* --config-file */
505
/* This is already done by parse_opt_config_file() */
507
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
517
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
527
case 132: /* --debug */
531
* These reproduce what we would get without ARGP_NO_HELP
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
545
* When adding more options before this line, remember to also add a
546
* "case" to the "parse_opt_config_file" function below.
298
548
case ARGP_KEY_ARG:
299
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
549
/* Cryptsetup always passes an argument, which is an empty
550
string if "none" was specified in /etc/crypttab. So if
551
argument was empty, we ignore it silently. */
307
return ARGP_ERR_UNKNOWN;
312
plugin *plugin_list = NULL;
314
struct argp argp = { .options = options, .parser = parse_opt,
315
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
556
return ARGP_ERR_UNKNOWN;
558
return errno; /* Set to 0 at start */
561
/* This option parser is the same as parse_opt() above, except it
562
ignores everything but the --config-file option. */
563
error_t parse_opt_config_file(int key, char *arg,
564
__attribute__((unused))
565
struct argp_state *state){
568
case 'g': /* --global-options */
569
case 'G': /* --global-env */
570
case 'o': /* --options-for */
571
case 'E': /* --env-for */
572
case 'd': /* --disable */
573
case 'e': /* --enable */
574
case 128: /* --plugin-dir */
576
case 129: /* --config-file */
578
argfile = strdup(arg);
580
case 130: /* --userid */
581
case 131: /* --groupid */
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
589
return ARGP_ERR_UNKNOWN;
594
struct argp argp = { .options = options,
595
.parser = parse_opt_config_file,
316
597
.doc = "Mandos plugin runner -- Run plugins" };
318
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
319
if (ret == ARGP_ERR_UNKNOWN){
320
fprintf(stderr, "Unknown error while parsing arguments\n");
321
exitstatus = EXIT_FAILURE;
326
/* This is a mangled argument in the form of
327
"+--option+--other-option=parameter+--yet-another-option", etc */
328
/* Make new argc and argv vars, and call argp_parse() again. */
329
plus_options++; /* skip the first '+' character */
330
const char delims[] = "+";
333
plus_argv = malloc(sizeof(char*) * 2);
334
if(plus_argv == NULL){
336
exitstatus = EXIT_FAILURE;
339
plus_argv[0] = argv[0];
342
while((arg = strsep(&plus_options, delims)) != NULL){
344
plus_argv = realloc(plus_argv, sizeof(char *)
345
* ((unsigned int) new_argc + 1));
346
if(plus_argv == NULL){
348
exitstatus = EXIT_FAILURE;
351
plus_argv[new_argc-1] = arg;
352
plus_argv[new_argc] = NULL;
355
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
356
if (ret == ARGP_ERR_UNKNOWN){
357
fprintf(stderr, "Unknown error while parsing arguments\n");
358
exitstatus = EXIT_FAILURE;
599
/* Parse using parse_opt_config_file() in order to get the custom
600
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
614
exitstatus = EX_USAGE;
618
/* Reset to the normal argument parser */
619
argp.parser = parse_opt;
621
/* Open the configfile if available */
623
conffp = fopen(AFILE, "r");
625
conffp = fopen(argfile, "r");
628
char *org_line = NULL;
629
char *p, *arg, *new_arg, *line;
631
const char whitespace_delims[] = " \r\t\f\v\n";
632
const char comment_delim[] = "#";
635
custom_argv = malloc(sizeof(char*) * 2);
636
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
641
custom_argv[0] = argv[0];
642
custom_argv[1] = NULL;
644
/* for each line in the config file, strip whitespace and ignore
647
sret = getline(&org_line, &size, conffp);
653
arg = strsep(&line, comment_delim);
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
667
custom_argv = realloc(custom_argv, sizeof(char *)
668
* ((unsigned int) custom_argc + 1));
669
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
675
custom_argv[custom_argc-1] = new_arg;
676
custom_argv[custom_argc] = NULL;
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
689
/* Check for harmful errors and go to fallback. Other errors might
690
not affect opening plugins */
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
699
if(custom_argv != NULL){
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
713
exitstatus = EX_CONFIG;
718
/* Parse actual command line arguments, to let them override the
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
733
exitstatus = EX_USAGE;
367
741
for(char **a = p->argv; *a != NULL; a++){
368
742
fprintf(stderr, "\tArg: %s\n", *a);
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
745
for(char **a = p->environ; *a != NULL; a++){
746
fprintf(stderr, "\t%s\n", *a);
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
760
error(0, errno, "fstat");
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
765
error(0, errno, "fchown");
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
773
/* Lower permissions */
776
error(0, errno, "setgid");
373
778
ret = setuid(uid);
383
dir = opendir(plugindir);
385
perror("Could not open plugin dir");
386
exitstatus = EXIT_FAILURE;
390
/* Set the FD_CLOEXEC flag on the directory, if possible */
780
error(0, errno, "setuid");
783
/* Open plugin directory with close_on_exec flag */
392
int dir_fd = dirfd(dir);
394
ret = set_cloexec_flag(dir_fd);
396
perror("set_cloexec_flag");
397
exitstatus = EXIT_FAILURE;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
790
#else /* not O_CLOEXEC */
792
#endif /* not O_CLOEXEC */
795
dir_fd = open(plugindir, O_RDONLY |
798
#else /* not O_CLOEXEC */
800
#endif /* not O_CLOEXEC */
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
818
#endif /* O_CLOEXEC */
820
dir = fdopendir(dir_fd);
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
403
829
FD_ZERO(&rfds_all);
831
/* Read and execute any executable in the plugin directory*/
406
dirst = readdir(dir);
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
408
// All directory entries have been processed
837
/* All directory entries have been processed */
409
838
if(dirst == NULL){
412
exitstatus = EXIT_FAILURE;
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
418
847
d_name_len = strlen(dirst->d_name);
420
// Ignore dotfiles, backup files and other junk
849
/* Ignore dotfiles, backup files and other junk */
422
851
bool bad_name = false;
424
const char const *bad_prefixes[] = { ".", "#", NULL };
853
const char * const bad_prefixes[] = { ".", "#", NULL };
426
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
855
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
428
858
".dpkg-divert", NULL };
429
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
859
#pragma GCC diagnostic push
860
#pragma GCC diagnostic ignored "-Wcast-qual"
861
for(const char **pre = (const char **)bad_prefixes;
862
*pre != NULL; pre++){
863
#pragma GCC diagnostic pop
430
864
size_t pre_len = strlen(*pre);
431
865
if((d_name_len >= pre_len)
432
866
and strncmp((dirst->d_name), *pre, pre_len) == 0){
497
plugin *p = getplugin(dirst->d_name, &plugin_list);
499
948
/* Add global arguments to argument list for this plugin */
500
plugin *g = getplugin(NULL, &plugin_list);
501
for(char **a = g->argv + 1; *a != NULL; a++){
509
exitstatus = EXIT_FAILURE;
949
plugin *g = getplugin(NULL);
951
for(char **a = g->argv + 1; *a != NULL; a++){
952
if(not add_argument(p, *a)){
953
error(0, errno, "add_argument");
956
/* Add global environment variables */
957
for(char **e = g->environ; *e != NULL; e++){
958
if(not add_environment(p, *e, false)){
959
error(0, errno, "add_environment");
964
/* If this plugin has any environment variables, we will call
965
using execve and need to duplicate the environment from this
967
if(p->environ[0] != NULL){
968
for(char **e = environ; *e != NULL; e++){
969
if(not add_environment(p, *e, false)){
970
error(0, errno, "add_environment");
976
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
978
error(0, errno, "pipe");
979
exitstatus = EX_OSERR;
982
/* Ask OS to automatic close the pipe on exec */
512
983
ret = set_cloexec_flag(pipefd[0]);
514
perror("set_cloexec_flag");
515
exitstatus = EXIT_FAILURE;
985
error(0, errno, "set_cloexec_flag");
986
exitstatus = EX_OSERR;
518
989
ret = set_cloexec_flag(pipefd[1]);
520
perror("set_cloexec_flag");
521
exitstatus = EXIT_FAILURE;
991
error(0, errno, "set_cloexec_flag");
992
exitstatus = EX_OSERR;
524
995
/* Block SIGCHLD until process is safely in process list */
525
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
996
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
997
&sigchld_action.sa_mask,
527
perror("sigprocmask");
528
exitstatus = EXIT_FAILURE;
1000
error(0, errno, "sigprocmask");
1001
exitstatus = EX_OSERR;
531
// Starting a new process to be watched
1004
/* Starting a new process to be watched */
1008
} while(pid == -1 and errno == EINTR);
535
exitstatus = EXIT_FAILURE;
1010
error(0, errno, "fork");
1011
exitstatus = EX_OSERR;
539
1015
/* this is the child process */
540
1016
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1018
error(0, errno, "sigaction");
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1021
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
547
perror("sigprocmask");
1023
error(0, errno, "sigprocmask");
551
1027
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1029
error(0, errno, "dup2");
557
1033
if(dirfd(dir) < 0){
559
1035
above and must now close it manually here. */
562
if(execv(filename, p->argv) < 0){
1038
if(p->environ[0] == NULL){
1039
if(execv(filename, p->argv) < 0){
1040
error(0, errno, "execv for %s", filename);
1044
if(execve(filename, p->argv, p->environ) < 0){
1045
error(0, errno, "execve for %s", filename);
1051
/* Parent process */
1052
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
570
close(pipefd[1]); /* close unused write end of pipe */
571
process *new_process = malloc(sizeof(process));
572
if (new_process == NULL){
574
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1055
plugin *new_plugin = getplugin(dirst->d_name);
1056
if(new_plugin == NULL){
1057
error(0, errno, "getplugin");
1058
ret = (int)(TEMP_FAILURE_RETRY
1059
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
576
perror("sigprocmask");
1062
error(0, errno, "sigprocmask");
578
exitstatus = EXIT_FAILURE;
1064
exitstatus = EX_OSERR;
582
*new_process = (struct process){ .pid = pid,
584
.next = process_list };
586
process_list = new_process;
1068
new_plugin->pid = pid;
1069
new_plugin->fd = pipefd[0];
587
1071
/* Unblock SIGCHLD so signal handler can be run if this process
588
1072
has already completed */
589
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1073
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1074
&sigchld_action.sa_mask,
591
perror("sigprocmask");
592
exitstatus = EXIT_FAILURE;
596
FD_SET(new_process->fd, &rfds_all);
598
if (maxfd < new_process->fd){
599
maxfd = new_process->fd;
604
/* Free the plugin list */
605
for(plugin *next; plugin_list != NULL; plugin_list = next){
606
next = plugin_list->next;
607
free(plugin_list->argv);
1077
error(0, errno, "sigprocmask");
1078
exitstatus = EX_OSERR;
1082
#if defined (__GNUC__) and defined (__GLIBC__)
1083
#if not __GLIBC_PREREQ(2, 16)
1084
#pragma GCC diagnostic push
1085
#pragma GCC diagnostic ignored "-Wsign-conversion"
1088
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1089
-Wconversion in GNU libc
1091
#if defined (__GNUC__) and defined (__GLIBC__)
1092
#if not __GLIBC_PREREQ(2, 16)
1093
#pragma GCC diagnostic pop
1097
if(maxfd < new_plugin->fd){
1098
maxfd = new_plugin->fd;
1102
TEMP_FAILURE_RETRY(closedir(dir));
614
if (process_list == NULL){
615
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1104
free_plugin(getplugin(NULL));
1106
for(plugin *p = plugin_list; p != NULL; p = p->next){
1110
if(p->next == NULL){
1111
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1117
/* Main loop while running plugins exist */
620
1119
fd_set rfds = rfds_all;
621
1120
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
622
if (select_ret == -1){
624
exitstatus = EXIT_FAILURE;
1121
if(select_ret == -1 and errno != EINTR){
1122
error(0, errno, "select");
1123
exitstatus = EX_OSERR;
627
1126
/* OK, now either a process completed, or something can be read
628
1127
from one of them */
629
for(process *proc = process_list; proc ; proc = proc->next){
1128
for(plugin *proc = plugin_list; proc != NULL;){
630
1129
/* Is this process completely done? */
631
if(proc->eof and proc->completed){
1130
if(proc->completed and proc->eof){
632
1131
/* Only accept the plugin output if it exited cleanly */
633
1132
if(not WIFEXITED(proc->status)
634
1133
or WEXITSTATUS(proc->status) != 0){
635
1134
/* Bad exit by plugin */
637
1137
if(WIFEXITED(proc->status)){
638
fprintf(stderr, "Plugin %u exited with status %d\n",
639
(unsigned int) (proc->pid),
1138
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1139
" status %d\n", proc->name,
1140
(intmax_t) (proc->pid),
640
1141
WEXITSTATUS(proc->status));
641
} else if(WIFSIGNALED(proc->status)) {
642
fprintf(stderr, "Plugin %u killed by signal %d\n",
643
(unsigned int) (proc->pid),
644
WTERMSIG(proc->status));
1142
} else if(WIFSIGNALED(proc->status)){
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1144
" signal %d: %s\n", proc->name,
1145
(intmax_t) (proc->pid),
1146
WTERMSIG(proc->status),
1147
strsignal(WTERMSIG(proc->status)));
645
1148
} else if(WCOREDUMP(proc->status)){
646
fprintf(stderr, "Plugin %d dumped core\n",
647
(unsigned int) (proc->pid));
1149
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1150
" core\n", proc->name, (intmax_t) (proc->pid));
650
1154
/* Remove the plugin */
651
FD_CLR(proc->fd, &rfds_all);
1155
#if defined (__GNUC__) and defined (__GLIBC__)
1156
#if not __GLIBC_PREREQ(2, 16)
1157
#pragma GCC diagnostic push
1158
#pragma GCC diagnostic ignored "-Wsign-conversion"
1161
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1162
-Wconversion in GNU libc
1164
#if defined (__GNUC__) and defined (__GLIBC__)
1165
#if not __GLIBC_PREREQ(2, 16)
1166
#pragma GCC diagnostic pop
652
1170
/* Block signal while modifying process_list */
653
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1171
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1173
&sigchld_action.sa_mask,
655
perror("sigprocmask");
656
exitstatus = EXIT_FAILURE;
659
/* Delete this process entry from the list */
660
if(process_list == proc){
661
/* First one - simple */
662
process_list = proc->next;
664
/* Second one or later */
665
for(process *p = process_list; p != NULL; p = p->next){
667
p->next = proc->next;
1176
error(0, errno, "sigprocmask");
1177
exitstatus = EX_OSERR;
1181
plugin *next_plugin = proc->next;
672
1185
/* We are done modifying process list, so unblock signal */
673
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1186
ret = (int)(TEMP_FAILURE_RETRY
1187
(sigprocmask(SIG_UNBLOCK,
1188
&sigchld_action.sa_mask, NULL)));
676
perror("sigprocmask");
680
/* We deleted this process from the list, so we can't go
681
proc->next. Therefore, start over from the beginning of
1190
error(0, errno, "sigprocmask");
1191
exitstatus = EX_OSERR;
1195
if(plugin_list == NULL){
685
1202
/* This process exited nicely, so print its buffer */
687
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1204
bool bret = print_out_password(proc->buffer,
1205
proc->buffer_length);
689
perror("print_out_password");
690
exitstatus = EXIT_FAILURE;
1207
error(0, errno, "print_out_password");
1208
exitstatus = EX_IOERR;
694
1213
/* This process has not completed. Does it have any output? */
695
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1214
#if defined (__GNUC__) and defined (__GLIBC__)
1215
#if not __GLIBC_PREREQ(2, 16)
1216
#pragma GCC diagnostic push
1217
#pragma GCC diagnostic ignored "-Wsign-conversion"
1220
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1226
#if defined (__GNUC__) and defined (__GLIBC__)
1227
#if not __GLIBC_PREREQ(2, 16)
1228
#pragma GCC diagnostic pop
696
1231
/* This process had nothing to say at this time */
699
1235
/* Before reading, make the process' data buffer large enough */
700
1236
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
701
1237
proc->buffer = realloc(proc->buffer, proc->buffer_size
702
1238
+ (size_t) BUFFER_SIZE);
703
if (proc->buffer == NULL){
705
exitstatus = EXIT_FAILURE;
1239
if(proc->buffer == NULL){
1240
error(0, errno, "malloc");
1241
exitstatus = EX_OSERR;
708
1244
proc->buffer_size += BUFFER_SIZE;
710
1246
/* Read from the process */
711
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1247
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1249
+ proc->buffer_length,
714
1252
/* Read error from this process; ignore the error */
719
1258
proc->eof = true;
721
proc->buffer_length += (size_t) ret;
1260
proc->buffer_length += (size_t) sret;
729
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
730
/* Fallback if all plugins failed, none are found or an error occured */
1268
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1269
and exitstatus != EX_OK)){
1270
/* Fallback if all plugins failed, none are found or an error
732
1273
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
733
1274
char *passwordbuffer = getpass("Password: ");
734
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1275
size_t len = strlen(passwordbuffer);
1276
/* Strip trailing newline */
1277
if(len > 0 and passwordbuffer[len-1] == '\n'){
1278
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1281
bret = print_out_password(passwordbuffer, len);
736
perror("print_out_password");
737
exitstatus = EXIT_FAILURE;
1283
error(0, errno, "print_out_password");
1284
exitstatus = EX_IOERR;
742
1288
/* Restore old signal handler */
743
sigaction(SIGCHLD, &old_sigchld_action, NULL);
747
/* Free the plugin list */
748
for(plugin *next; plugin_list != NULL; plugin_list = next){
749
next = plugin_list->next;
750
free(plugin_list->argv);
1289
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1291
error(0, errno, "sigaction");
1292
exitstatus = EX_OSERR;
1295
if(custom_argv != NULL){
1296
for(char **arg = custom_argv+1; *arg != NULL; arg++){
754
1302
if(dir != NULL){
758
/* Free the process list and kill the processes */
759
for(process *next; process_list != NULL; process_list = next){
760
next = process_list->next;
761
close(process_list->fd);
762
ret = kill(process_list->pid, SIGTERM);
763
if(ret == -1 and errno != ESRCH){
764
/* set-uid proccesses migth not get closed */
1306
/* Kill the processes */
1307
for(plugin *p = plugin_list; p != NULL; p = p->next){
1310
ret = kill(p->pid, SIGTERM);
1311
if(ret == -1 and errno != ESRCH){
1312
/* Set-uid proccesses might not get closed */
1313
error(0, errno, "kill");
767
free(process_list->buffer);
771
1318
/* Wait for any remaining child processes to terminate */
773
1320
ret = wait(NULL);
774
1321
} while(ret >= 0);
775
1322
if(errno != ECHILD){
1323
error(0, errno, "wait");
779
1331
return exitstatus;