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
#include <stdio.h> /* popen, fileno */
25
#include <iso646.h> /* and, or, not */
26
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
27
WIFEXITED, WEXITSTATUS, wait */
28
#include <sys/wait.h> /* wait */
29
#include <dirent.h> /* DIR, opendir */
30
#include <sys/stat.h> /* stat, struct stat */
31
#include <unistd.h> /* stat, struct stat, chdir */
32
#include <stdlib.h> /* EXIT_FAILURE */
33
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
35
#include <string.h> /* strlen, strcpy, strcat */
36
#include <stdbool.h> /* true */
37
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
38
#include <errno.h> /* errno */
39
#include <argp.h> /* argp */
43
typedef struct process{
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
58
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
76
#define BUFFER_SIZE 256
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
84
typedef struct plugin{
85
char *name; /* can be NULL or any plugin name */
92
/* Variables used for running processes*/
47
96
size_t buffer_size;
48
97
size_t buffer_length;
52
typedef struct plugin{
53
char *name; /* can be "global" and any plugin name */
99
volatile sig_atomic_t completed;
57
101
struct plugin *next;
60
plugin *getplugin(char *name, plugin **plugin_list){
61
for (plugin *p = *plugin_list; p != NULL; p = p->next){
63
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))){
67
116
/* Create a new plugin */
68
plugin *new_plugin = malloc(sizeof(plugin));
69
if (new_plugin == NULL){
73
new_plugin->name = name;
74
new_plugin->argv = malloc(sizeof(char *) * 2);
75
if (new_plugin->argv == NULL){
79
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;
80
153
new_plugin->argv[1] = NULL;
82
new_plugin->disable = false;
83
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;
84
168
/* Append the new plugin to the list */
85
*plugin_list = new_plugin;
169
plugin_list = new_plugin;
86
170
return new_plugin;
89
void addarguments(plugin *p, char *arg){
90
p->argv[p->argc] = arg;
91
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
97
p->argv[p->argc] = NULL;
100
#define BUFFER_SIZE 256
102
const char *argp_program_version =
103
"plugbasedclient 0.9";
104
const char *argp_program_bug_address =
105
"<mandos@fukt.bsnet.se>";
107
"Mandos plugin runner -- Run Mandos plugins";
108
/* A description of the arguments we accept. */
109
static char args_doc[] = "";
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));
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
245
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
247
/* If reading the flags failed, return error indication now. */
251
/* Store modified flag word in the descriptor. */
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
257
/* Mark processes as completed when they exit, and save their exit
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;
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
static bool print_out_password(const char *buffer, size_t length){
295
for(size_t written = 0; written < length; written += (size_t)ret){
296
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
static void free_plugin(plugin *plugin_node){
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
312
free(plugin_node->argv);
313
for(char **env = plugin_node->environ; *env != NULL; env++){
316
free(plugin_node->environ);
317
free(plugin_node->buffer);
319
/* Removes the plugin from the singly-linked list */
320
if(plugin_node == plugin_list){
321
/* First one - simple */
322
plugin_list = plugin_list->next;
324
/* Second one or later */
325
for(plugin *p = plugin_list; p != NULL; p = p->next){
326
if(p->next == plugin_node){
327
p->next = plugin_node->next;
336
static void free_plugin_list(void){
337
while(plugin_list != NULL){
338
free_plugin(plugin_list);
111
342
int main(int argc, char *argv[]){
112
const char *plugindir = "plugins.d";
343
char *plugindir = NULL;
344
char *argfile = NULL;
113
346
size_t d_name_len;
115
348
struct dirent *dirst;
118
351
int ret, maxfd = 0;
119
process *process_list = NULL;
356
int exitstatus = EXIT_SUCCESS;
357
struct sigaction old_sigchld_action;
358
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
359
.sa_flags = SA_NOCLDSTOP };
360
char **custom_argv = NULL;
363
/* Establish a signal handler */
364
sigemptyset(&sigchld_action.sa_mask);
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
121
378
/* The options we understand. */
122
379
struct argp_option options[] = {
123
380
{ .name = "global-options", .key = 'g',
124
.arg = "option[,option[,...]]", .flags = 0,
125
.doc = "Options effecting all plugins" },
381
.arg = "OPTION[,OPTION[,...]]",
382
.doc = "Options passed to all plugins" },
383
{ .name = "global-env", .key = 'G',
385
.doc = "Environment variable passed to all plugins" },
126
386
{ .name = "options-for", .key = 'o',
127
.arg = "plugin:option[,option[,...]]", .flags = 0,
128
.doc = "Options effecting only specified plugins" },
129
{ .name = "disable-plugin", .key = 'd',
130
.arg = "Plugin[,Plugin[,...]]", .flags = 0,
131
.doc = "Option to disable specififed plugins" },
387
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
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" },
392
{ .name = "disable", .key = 'd',
394
.doc = "Disable a specific plugin", .group = 1 },
395
{ .name = "enable", .key = 'e',
397
.doc = "Enable a specific plugin", .group = 1 },
132
398
{ .name = "plugin-dir", .key = 128,
133
.arg = "Directory", .flags = 0,
134
.doc = "Option to change directory to search for plugins" },
400
.doc = "Specify a different plugin directory", .group = 2 },
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 },
138
error_t parse_opt (int key, char *arg, struct argp_state *state) {
139
/* Get the INPUT argument from `argp_parse', which we
140
know is a pointer to our arguments structure. */
141
plugin **plugins = state->input;
145
char *p = strtok(arg, ",");
147
addarguments(getplugin(NULL, plugins), p);
148
p = strtok(NULL, ",");
154
char *name = strtok(arg, ":");
155
char *p = strtok(NULL, ":");
158
addarguments(getplugin(name, plugins), p);
159
p = strtok(NULL, ",");
165
char *p = strtok(arg, ",");
167
getplugin(p, plugins)->disable = true;
168
p = strtok(NULL, ",");
181
return ARGP_ERR_UNKNOWN;
186
plugin *plugin_list = NULL;
188
struct argp argp = { .options = options, .parser = parse_opt,
189
.args_doc = args_doc, .doc = doc };
191
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
193
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
194
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
195
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
196
/* fprintf(stderr, "\tArg: %s\n", *a); */
202
dir = opendir(plugindir);
205
fprintf(stderr, "Can not open directory\n");
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.
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. */
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,
597
.doc = "Mandos plugin runner -- Run plugins" };
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;
738
for(plugin *p = plugin_list; p != NULL; p=p->next){
739
fprintf(stderr, "Plugin: %s has %d arguments\n",
740
p->name ? p->name : "Global", p->argc - 1);
741
for(char **a = p->argv; *a != NULL; a++){
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");
780
error(0, errno, "setuid");
783
/* Open plugin directory with close_on_exec flag */
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;
831
/* Read and execute any executable in the plugin directory*/
212
dirst = readdir(dir);
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
214
// All directory entries have been processed
837
/* All directory entries have been processed */
215
838
if(dirst == NULL){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
219
847
d_name_len = strlen(dirst->d_name);
221
// Ignore dotfiles and backup files
222
if (dirst->d_name[0] == '.'
223
or dirst->d_name[d_name_len - 1] == '~'){
227
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
228
strcpy(filename, plugindir);
229
strcat(filename, "/");
230
strcat(filename, dirst->d_name);
234
if (S_ISREG(st.st_mode)
235
and (access(filename, X_OK) == 0)
236
and not (getplugin(dirst->d_name, &plugin_list)->disable)){
237
// Starting a new process to be watched
238
process *new_process = malloc(sizeof(process));
245
new_process->pid = fork();
246
if(new_process->pid == 0){
247
/* this is the child process */
849
/* Ignore dotfiles, backup files and other junk */
851
bool bad_name = false;
853
const char const *bad_prefixes[] = { ".", "#", NULL };
855
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
858
".dpkg-divert", NULL };
859
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
860
size_t pre_len = strlen(*pre);
861
if((d_name_len >= pre_len)
862
and strncmp((dirst->d_name), *pre, pre_len) == 0){
864
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
865
" with bad prefix %s\n", dirst->d_name, *pre);
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
size_t suf_len = strlen(*suf);
876
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
881
" with bad suffix %s\n", dirst->d_name, *suf);
894
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
903
error(0, errno, "asprintf");
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
909
error(0, errno, "stat");
914
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
" with bad type or mode\n", filename);
925
plugin *p = getplugin(dirst->d_name);
927
error(0, errno, "getplugin");
933
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
940
/* Add global arguments to argument list for this plugin */
941
plugin *g = getplugin(NULL);
943
for(char **a = g->argv + 1; *a != NULL; a++){
944
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
948
/* Add global environment variables */
949
for(char **e = g->environ; *e != NULL; e++){
950
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
956
/* If this plugin has any environment variables, we will call
957
using execve and need to duplicate the environment from this
959
if(p->environ[0] != NULL){
960
for(char **e = environ; *e != NULL; e++){
961
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
974
/* Ask OS to automatic close the pipe on exec */
975
ret = set_cloexec_flag(pipefd[0]);
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
981
ret = set_cloexec_flag(pipefd[1]);
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
987
/* Block SIGCHLD until process is safely in process list */
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
996
/* Starting a new process to be watched */
1000
} while(pid == -1 and errno == EINTR);
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
1007
/* this is the child process */
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1010
error(0, errno, "sigaction");
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1015
error(0, errno, "sigprocmask");
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1021
error(0, errno, "dup2");
1026
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1027
above and must now close it manually here. */
249
close(pipefd[0]); /* close unused read end of pipe */
250
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
252
plugin *p = getplugin(dirst->d_name, &plugin_list);
253
plugin *g = getplugin(NULL, &plugin_list);
254
for(char **a = g->argv + 1; *a != NULL; a++){
1030
if(p->environ[0] == NULL){
257
1031
if(execv(filename, p->argv) < 0){
264
close(pipefd[1]); /* close unused write end of pipe */
265
new_process->fd = pipefd[0];
266
new_process->buffer = malloc(BUFFER_SIZE);
267
if (new_process->buffer == NULL){
271
new_process->buffer_size = BUFFER_SIZE;
272
new_process->buffer_length = 0;
273
FD_SET(new_process->fd, &rfds_orig);
275
if (maxfd < new_process->fd){
276
maxfd = new_process->fd;
280
new_process->next = process_list;
281
process_list = new_process;
287
if (process_list != NULL){
289
fd_set rfds = rfds_orig;
290
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
291
if (select_ret == -1){
295
for(process *process_itr = process_list; process_itr != NULL;
296
process_itr = process_itr->next){
297
if(FD_ISSET(process_itr->fd, &rfds)){
298
if(process_itr->buffer_length + BUFFER_SIZE
299
> process_itr->buffer_size){
300
process_itr->buffer = realloc(process_itr->buffer,
301
process_itr->buffer_size
302
+ (size_t) BUFFER_SIZE);
303
if (process_itr->buffer == NULL){
307
process_itr->buffer_size += BUFFER_SIZE;
309
ret = read(process_itr->fd, process_itr->buffer
310
+ process_itr->buffer_length, BUFFER_SIZE);
312
/* Read error from this process; ignore it */
315
process_itr->buffer_length += (size_t) ret;
318
/* wait for process exit */
320
waitpid(process_itr->pid, &status, 0);
321
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
322
for(size_t written = 0;
323
written < process_itr->buffer_length;){
324
ret = write(STDOUT_FILENO,
325
process_itr->buffer + written,
326
process_itr->buffer_length - written);
331
written += (size_t)ret;
335
FD_CLR(process_itr->fd, &rfds_orig);
345
for(process *process_itr = process_list; process_itr != NULL;
346
process_itr = process_itr->next){
347
close(process_itr->fd);
348
kill(process_itr->pid, SIGTERM);
349
free(process_itr->buffer);
1032
error(0, errno, "execv for %s", filename);
1036
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1043
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1047
plugin *new_plugin = getplugin(dirst->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1054
error(0, errno, "sigprocmask");
1056
exitstatus = EX_OSERR;
1060
new_plugin->pid = pid;
1061
new_plugin->fd = pipefd[0];
1063
/* Unblock SIGCHLD so signal handler can be run if this process
1064
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1077
if(maxfd < new_plugin->fd){
1078
maxfd = new_plugin->fd;
1082
TEMP_FAILURE_RETRY(closedir(dir));
1084
free_plugin(getplugin(NULL));
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
1090
if(p->next == NULL){
1091
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1097
/* Main loop while running plugins exist */
1099
fd_set rfds = rfds_all;
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
1106
/* OK, now either a process completed, or something can be read
1108
for(plugin *proc = plugin_list; proc != NULL;){
1109
/* Is this process completely done? */
1110
if(proc->completed and proc->eof){
1111
/* Only accept the plugin output if it exited cleanly */
1112
if(not WIFEXITED(proc->status)
1113
or WEXITSTATUS(proc->status) != 0){
1114
/* Bad exit by plugin */
1117
if(WIFEXITED(proc->status)){
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
1121
WEXITSTATUS(proc->status));
1122
} else if(WIFSIGNALED(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1124
" signal %d: %s\n", proc->name,
1125
(intmax_t) (proc->pid),
1126
WTERMSIG(proc->status),
1127
strsignal(WTERMSIG(proc->status)));
1128
} else if(WCOREDUMP(proc->status)){
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
1134
/* Remove the plugin */
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1138
/* Block signal while modifying process_list */
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1141
&sigchld_action.sa_mask,
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
1149
plugin *next_plugin = proc->next;
1153
/* We are done modifying process list, so unblock signal */
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1163
if(plugin_list == NULL){
1170
/* This process exited nicely, so print its buffer */
1172
bool bret = print_out_password(proc->buffer,
1173
proc->buffer_length);
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1181
/* This process has not completed. Does it have any output? */
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1185
/* This process had nothing to say at this time */
1189
/* Before reading, make the process' data buffer large enough */
1190
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
+ (size_t) BUFFER_SIZE);
1193
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1198
proc->buffer_size += BUFFER_SIZE;
1200
/* Read from the process */
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1203
+ proc->buffer_length,
1206
/* Read error from this process; ignore the error */
1214
proc->buffer_length += (size_t) sret;
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1224
/* Fallback if all plugins failed, none are found or an error
1227
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1228
char *passwordbuffer = getpass("Password: ");
1229
size_t len = strlen(passwordbuffer);
1230
/* Strip trailing newline */
1231
if(len > 0 and passwordbuffer[len-1] == '\n'){
1232
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1235
bret = print_out_password(passwordbuffer, len);
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1242
/* Restore old signal handler */
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1249
if(custom_argv != NULL){
1250
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1260
/* Kill the processes */
1261
for(plugin *p = plugin_list; p != NULL; p = p->next){
1264
ret = kill(p->pid, SIGTERM);
1265
if(ret == -1 and errno != ESRCH){
1266
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
1272
/* Wait for any remaining child processes to terminate */
1276
if(errno != ECHILD){
1277
error(0, errno, "wait");