18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
25
#define _FORTIFY_SOURCE 2
27
#include <stdio.h> /* popen, fileno */
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
30
WIFEXITED, WEXITSTATUS, wait */
31
#include <sys/wait.h> /* wait */
32
#include <dirent.h> /* DIR, opendir */
33
#include <sys/stat.h> /* stat, struct stat */
34
#include <unistd.h> /* stat, struct stat, chdir */
35
#include <stdlib.h> /* EXIT_FAILURE */
36
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
38
#include <string.h> /* strlen, strcpy, strcat */
39
#include <stdbool.h> /* true */
40
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
41
#include <errno.h> /* errno */
42
#include <argp.h> /* argp */
46
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> /* perror, 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(),
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 */
74
#define BUFFER_SIZE 256
76
#define PDIR "/lib/mandos/plugins.d"
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
79
const char *argp_program_version = "plugin-runner " VERSION;
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
typedef struct plugin{
83
char *name; /* can be NULL or any plugin name */
90
/* Variables used for running processes*/
50
94
size_t buffer_size;
51
95
size_t buffer_length;
55
typedef struct plugin{
56
char *name; /* can be "global" and any plugin name */
97
volatile sig_atomic_t completed;
59
99
struct plugin *next;
62
plugin *getplugin(char *name, plugin **plugin_list){
63
for (plugin *p = *plugin_list; p != NULL; p = p->next){
65
or (p->name and name and (strcmp(p->name, name) == 0))){
102
static plugin *plugin_list = NULL;
104
/* Gets an existing plugin based on name,
105
or if none is found, creates a new one */
106
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
110
or (p->name and name and (strcmp(p->name, name) == 0))){
69
114
/* Create a new plugin */
70
plugin *new_plugin = malloc(sizeof(plugin));
71
if (new_plugin == NULL){
75
new_plugin->name = name;
76
new_plugin->argv = malloc(sizeof(char *) * 2);
77
if (new_plugin->argv == NULL){
81
new_plugin->argv[0] = name;
115
plugin *new_plugin = NULL;
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
122
char *copy_name = NULL;
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
127
if(copy_name == NULL){
135
*new_plugin = (plugin){ .name = copy_name,
138
.next = plugin_list };
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
150
new_plugin->argv[0] = copy_name;
82
151
new_plugin->argv[1] = NULL;
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
156
if(new_plugin->environ == NULL){
159
free(new_plugin->argv);
164
new_plugin->environ[0] = NULL;
84
166
/* Append the new plugin to the list */
85
new_plugin->next = *plugin_list;
86
*plugin_list = new_plugin;
167
plugin_list = new_plugin;
87
168
return new_plugin;
90
void addarguments(plugin *p, char *arg){
91
p->argv[p->argc] = arg;
92
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
98
p->argv[p->argc] = NULL;
101
#define BUFFER_SIZE 256
103
const char *argp_program_version =
104
"plugbasedclient 0.9";
105
const char *argp_program_bug_address =
106
"<mandos@fukt.bsnet.se>";
108
"Mandos plugin runner -- Run Mandos plugins";
109
/* A description of the arguments we accept. */
110
static char args_doc[] = "";
171
/* Helper function for add_argument and add_environment */
172
static bool add_to_char_array(const char *new, char ***array,
174
/* Resize the pointed-to array to hold one more pointer */
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
183
/* Make a copy of the new string */
187
} while(copy == NULL and errno == EINTR);
191
/* Insert the copy */
192
(*array)[*len] = copy;
194
/* Add a new terminating NULL pointer to the last element */
195
(*array)[*len] = NULL;
199
/* Add to a plugin's argument vector */
200
static bool add_argument(plugin *p, const char *arg){
204
return add_to_char_array(arg, &(p->argv), &(p->argc));
207
/* Add to a plugin's environment */
208
static bool add_environment(plugin *p, const char *def, bool replace){
212
/* namelen = length of name of environment variable */
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
/* Search for this environment variable */
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
217
/* It already exists */
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
232
return add_to_char_array(def, &(p->environ), &(p->envc));
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
240
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
242
/* If reading the flags failed, return error indication now. */
246
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
252
/* Mark processes as completed when they exit, and save their exit
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
257
plugin *proc = plugin_list;
259
pid_t pid = waitpid(-1, &status, WNOHANG);
261
/* Only still running child processes */
266
/* No child processes */
272
/* A child exited, find it in process_list */
273
while(proc != NULL and proc->pid != pid){
277
/* Process not found in process list */
280
proc->status = status;
286
/* Prints out a password to stdout */
287
static bool print_out_password(const char *buffer, size_t length){
289
for(size_t written = 0; written < length; written += (size_t)ret){
290
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
299
/* Removes and free a plugin from the plugin list */
300
static void free_plugin(plugin *plugin_node){
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
305
free(plugin_node->argv);
306
for(char **env = plugin_node->environ; *env != NULL; env++){
309
free(plugin_node->environ);
310
free(plugin_node->buffer);
312
/* Removes the plugin from the singly-linked list */
313
if(plugin_node == plugin_list){
314
/* First one - simple */
315
plugin_list = plugin_list->next;
317
/* Second one or later */
318
for(plugin *p = plugin_list; p != NULL; p = p->next){
319
if(p->next == plugin_node){
320
p->next = plugin_node->next;
329
static void free_plugin_list(void){
330
while(plugin_list != NULL){
331
free_plugin(plugin_list);
112
335
int main(int argc, char *argv[]){
113
char plugindir[] = "plugins.d";
114
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
336
char *plugindir = NULL;
337
char *argfile = NULL;
116
341
struct dirent *dirst;
119
344
int ret, maxfd = 0;
120
process *process_list = NULL;
349
int exitstatus = EXIT_SUCCESS;
350
struct sigaction old_sigchld_action;
351
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
352
.sa_flags = SA_NOCLDSTOP };
353
char **custom_argv = NULL;
356
/* Establish a signal handler */
357
sigemptyset(&sigchld_action.sa_mask);
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
exitstatus = EX_OSERR;
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
exitstatus = EX_OSERR;
122
371
/* The options we understand. */
123
372
struct argp_option options[] = {
124
373
{ .name = "global-options", .key = 'g',
125
.arg = "option[,option[,...]]", .flags = 0,
126
.doc = "Options effecting all plugins" },
374
.arg = "OPTION[,OPTION[,...]]",
375
.doc = "Options passed to all plugins" },
376
{ .name = "global-env", .key = 'G',
378
.doc = "Environment variable passed to all plugins" },
127
379
{ .name = "options-for", .key = 'o',
128
.arg = "plugin:option[,option[,...]]", .flags = 0,
129
.doc = "Options effecting only specified plugins" },
380
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
381
.doc = "Options passed only to specified plugin" },
382
{ .name = "env-for", .key = 'E',
383
.arg = "PLUGIN:ENV=value",
384
.doc = "Environment variable passed to specified plugin" },
385
{ .name = "disable", .key = 'd',
387
.doc = "Disable a specific plugin", .group = 1 },
388
{ .name = "enable", .key = 'e',
390
.doc = "Enable a specific plugin", .group = 1 },
391
{ .name = "plugin-dir", .key = 128,
393
.doc = "Specify a different plugin directory", .group = 2 },
394
{ .name = "config-file", .key = 129,
396
.doc = "Specify a different configuration file", .group = 2 },
397
{ .name = "userid", .key = 130,
398
.arg = "ID", .flags = 0,
399
.doc = "User ID the plugins will run as", .group = 3 },
400
{ .name = "groupid", .key = 131,
401
.arg = "ID", .flags = 0,
402
.doc = "Group ID the plugins will run as", .group = 3 },
403
{ .name = "debug", .key = 132,
404
.doc = "Debug mode", .group = 4 },
406
* These reproduce what we would get without ARGP_NO_HELP
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
133
error_t parse_opt (int key, char *arg, struct argp_state *state) {
134
/* Get the INPUT argument from `argp_parse', which we
135
know is a pointer to our arguments structure. */
136
plugin **plugins = state->input;
140
char *p = strtok(arg, ",");
142
addarguments(getplugin(NULL, plugins), p);
143
p = strtok(NULL, ",");
149
char *name = strtok(arg, ":");
150
char *p = strtok(NULL, ":");
153
addarguments(getplugin(name, plugins), p);
154
p = strtok(NULL, ",");
164
return ARGP_ERR_UNKNOWN;
169
plugin *plugin_list = NULL;
171
struct argp argp = { .options = options, .parser = parse_opt,
172
.args_doc = args_doc, .doc = doc };
174
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
176
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
177
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
178
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
179
/* fprintf(stderr, "\tArg: %s\n", *a); */
185
dir = opendir(plugindir);
188
fprintf(stderr, "Can not open directory\n");
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
422
case 'g': /* --global-options */
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
432
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
435
case 'o': /* --options-for */
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
446
argp_error(state, "Empty plugin name");
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
458
case 'E': /* --env-for */
460
char *envdef = strchr(arg, ':');
462
argp_error(state, "No colon in \"%s\"", arg);
469
argp_error(state, "Empty plugin name");
473
add_environment(getplugin(arg), envdef, true);
476
case 'd': /* --disable */
478
plugin *p = getplugin(arg);
484
case 'e': /* --enable */
486
plugin *p = getplugin(arg);
492
case 128: /* --plugin-dir */
494
plugindir = strdup(arg);
496
case 129: /* --config-file */
497
/* This is already done by parse_opt_config_file() */
499
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
509
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
519
case 132: /* --debug */
523
* These reproduce what we would get without ARGP_NO_HELP
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
541
/* Cryptsetup always passes an argument, which is an empty
542
string if "none" was specified in /etc/crypttab. So if
543
argument was empty, we ignore it silently. */
548
return ARGP_ERR_UNKNOWN;
550
return errno; /* Set to 0 at start */
553
/* This option parser is the same as parse_opt() above, except it
554
ignores everything but the --config-file option. */
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
560
case 'g': /* --global-options */
561
case 'G': /* --global-env */
562
case 'o': /* --options-for */
563
case 'E': /* --env-for */
564
case 'd': /* --disable */
565
case 'e': /* --enable */
566
case 128: /* --plugin-dir */
568
case 129: /* --config-file */
570
argfile = strdup(arg);
572
case 130: /* --userid */
573
case 131: /* --groupid */
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
581
return ARGP_ERR_UNKNOWN;
586
struct argp argp = { .options = options,
587
.parser = parse_opt_config_file,
589
.doc = "Mandos plugin runner -- Run plugins" };
591
/* Parse using parse_opt_config_file() in order to get the custom
592
config file location, if any. */
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
606
exitstatus = EX_USAGE;
610
/* Reset to the normal argument parser */
611
argp.parser = parse_opt;
613
/* Open the configfile if available */
615
conffp = fopen(AFILE, "r");
617
conffp = fopen(argfile, "r");
620
char *org_line = NULL;
621
char *p, *arg, *new_arg, *line;
623
const char whitespace_delims[] = " \r\t\f\v\n";
624
const char comment_delim[] = "#";
627
custom_argv = malloc(sizeof(char*) * 2);
628
if(custom_argv == NULL){
630
exitstatus = EX_OSERR;
633
custom_argv[0] = argv[0];
634
custom_argv[1] = NULL;
636
/* for each line in the config file, strip whitespace and ignore
639
sret = getline(&org_line, &size, conffp);
645
arg = strsep(&line, comment_delim);
646
while((p = strsep(&arg, whitespace_delims)) != NULL){
653
exitstatus = EX_OSERR;
659
custom_argv = realloc(custom_argv, sizeof(char *)
660
* ((unsigned int) custom_argc + 1));
661
if(custom_argv == NULL){
663
exitstatus = EX_OSERR;
667
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
676
exitstatus = EX_IOERR;
681
/* Check for harmful errors and go to fallback. Other errors might
682
not affect opening plugins */
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
685
exitstatus = EX_OSERR;
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
691
if(custom_argv != NULL){
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
705
exitstatus = EX_CONFIG;
710
/* Parse actual command line arguments, to let them override the
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
725
exitstatus = EX_USAGE;
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
731
fprintf(stderr, "Plugin: %s has %d arguments\n",
732
p->name ? p->name : "Global", p->argc - 1);
733
for(char **a = p->argv; *a != NULL; a++){
734
fprintf(stderr, "\tArg: %s\n", *a);
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
737
for(char **a = p->environ; *a != NULL; a++){
738
fprintf(stderr, "\t%s\n", *a);
743
/* Strip permissions down to nobody */
753
/* Open plugin directory with close_on_exec flag */
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
760
#else /* not O_CLOEXEC */
762
#endif /* not O_CLOEXEC */
765
dir_fd = open(plugindir, O_RDONLY |
768
#else /* not O_CLOEXEC */
770
#endif /* not O_CLOEXEC */
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
788
#endif /* O_CLOEXEC */
790
dir = fdopendir(dir_fd);
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
801
/* Read and execute any executable in the plugin directory*/
195
dirst = readdir(dir);
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
197
// All directory entries have been processed
807
/* All directory entries have been processed */
198
808
if(dirst == NULL){
811
exitstatus = EX_IOERR;
202
817
d_name_len = strlen(dirst->d_name);
204
// Ignore dotfiles and backup files
205
if (dirst->d_name[0] == '.'
206
or dirst->d_name[d_name_len - 1] == '~'){
210
char *filename = malloc(d_name_len + plugindir_len + 2);
211
strcpy(filename, plugindir);
212
strcat(filename, "/");
213
strcat(filename, dirst->d_name);
217
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
218
// Starting a new process to be watched
219
process *new_process = malloc(sizeof(process));
226
new_process->pid = fork();
227
if(new_process->pid == 0){
228
/* this is the child process */
819
/* Ignore dotfiles, backup files and other junk */
821
bool bad_name = false;
823
const char const *bad_prefixes[] = { ".", "#", NULL };
825
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
828
".dpkg-divert", NULL };
829
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
size_t pre_len = strlen(*pre);
831
if((d_name_len >= pre_len)
832
and strncmp((dirst->d_name), *pre, pre_len) == 0){
834
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
835
" with bad prefix %s\n", dirst->d_name, *pre);
844
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
size_t suf_len = strlen(*suf);
846
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
850
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
851
" with bad suffix %s\n", dirst->d_name, *suf);
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
884
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" with bad type or mode\n", filename);
895
plugin *p = getplugin(dirst->d_name);
903
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
910
/* Add global arguments to argument list for this plugin */
911
plugin *g = getplugin(NULL);
913
for(char **a = g->argv + 1; *a != NULL; a++){
914
if(not add_argument(p, *a)){
915
perror("add_argument");
918
/* Add global environment variables */
919
for(char **e = g->environ; *e != NULL; e++){
920
if(not add_environment(p, *e, false)){
921
perror("add_environment");
926
/* If this plugin has any environment variables, we will call
927
using execve and need to duplicate the environment from this
929
if(p->environ[0] != NULL){
930
for(char **e = environ; *e != NULL; e++){
931
if(not add_environment(p, *e, false)){
932
perror("add_environment");
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
941
exitstatus = EX_OSERR;
944
/* Ask OS to automatic close the pipe on exec */
945
ret = set_cloexec_flag(pipefd[0]);
947
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
951
ret = set_cloexec_flag(pipefd[1]);
953
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
957
/* Block SIGCHLD until process is safely in process list */
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
962
perror("sigprocmask");
963
exitstatus = EX_OSERR;
966
/* Starting a new process to be watched */
970
} while(pid == -1 and errno == EINTR);
973
exitstatus = EX_OSERR;
977
/* this is the child process */
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
985
perror("sigprocmask");
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
996
/* If dir has no file descriptor, we could not set FD_CLOEXEC
997
above and must now close it manually here. */
230
close(pipefd[0]); /* close unused read end of pipe */
231
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
233
basename = strrchr(filename, '/');
234
if (basename == NULL){
239
plugin *p = getplugin(basename, &plugin_list);
241
plugin *g = getplugin(NULL, &plugin_list);
242
for(char **a = g->argv + 1; *a != NULL; a++){
1000
if(p->environ[0] == NULL){
245
1001
if(execv(filename, p->argv) < 0){
252
close(pipefd[1]); /* close unused write end of pipe */
253
new_process->fd = pipefd[0];
254
new_process->buffer = malloc(BUFFER_SIZE);
255
if (new_process->buffer == NULL){
259
new_process->buffer_size = BUFFER_SIZE;
260
new_process->buffer_length = 0;
261
FD_SET(new_process->fd, &rfds_orig);
263
if (maxfd < new_process->fd){
264
maxfd = new_process->fd;
268
new_process->next = process_list;
269
process_list = new_process;
275
if (process_list != NULL){
277
fd_set rfds = rfds_orig;
278
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
279
if (select_ret == -1){
283
for(process *process_itr = process_list; process_itr != NULL;
284
process_itr = process_itr->next){
285
if(FD_ISSET(process_itr->fd, &rfds)){
286
if(process_itr->buffer_length + BUFFER_SIZE
287
> process_itr->buffer_size){
288
process_itr->buffer = realloc(process_itr->buffer,
289
process_itr->buffer_size
290
+ (size_t) BUFFER_SIZE);
291
if (process_itr->buffer == NULL){
295
process_itr->buffer_size += BUFFER_SIZE;
297
ret = read(process_itr->fd, process_itr->buffer
298
+ process_itr->buffer_length, BUFFER_SIZE);
300
/* Read error from this process; ignore it */
303
process_itr->buffer_length += (size_t) ret;
306
/* wait for process exit */
308
waitpid(process_itr->pid, &status, 0);
309
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
310
for(size_t written = 0;
311
written < process_itr->buffer_length;){
312
ret = write(STDOUT_FILENO,
313
process_itr->buffer + written,
314
process_itr->buffer_length - written);
319
written += (size_t)ret;
323
FD_CLR(process_itr->fd, &rfds_orig);
333
for(process *process_itr = process_list; process_itr != NULL;
334
process_itr = process_itr->next){
335
close(process_itr->fd);
336
kill(process_itr->pid, SIGTERM);
337
free(process_itr->buffer);
1006
if(execve(filename, p->argv, p->environ) < 0){
1013
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
plugin *new_plugin = getplugin(dirst->d_name);
1018
if(new_plugin == NULL){
1019
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
perror("sigprocmask");
1026
exitstatus = EX_OSERR;
1030
new_plugin->pid = pid;
1031
new_plugin->fd = pipefd[0];
1033
/* Unblock SIGCHLD so signal handler can be run if this process
1034
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1039
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
if(maxfd < new_plugin->fd){
1048
maxfd = new_plugin->fd;
1052
TEMP_FAILURE_RETRY(closedir(dir));
1054
free_plugin(getplugin(NULL));
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
1060
if(p->next == NULL){
1061
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1067
/* Main loop while running plugins exist */
1069
fd_set rfds = rfds_all;
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
1073
exitstatus = EX_OSERR;
1076
/* OK, now either a process completed, or something can be read
1078
for(plugin *proc = plugin_list; proc != NULL;){
1079
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
1081
/* Only accept the plugin output if it exited cleanly */
1082
if(not WIFEXITED(proc->status)
1083
or WEXITSTATUS(proc->status) != 0){
1084
/* Bad exit by plugin */
1087
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
1091
WEXITSTATUS(proc->status));
1092
} else if(WIFSIGNALED(proc->status)){
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
1095
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
strsignal(WTERMSIG(proc->status)));
1098
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
1104
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1111
&sigchld_action.sa_mask,
1114
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
1119
plugin *next_plugin = proc->next;
1123
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
1128
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1133
if(plugin_list == NULL){
1140
/* This process exited nicely, so print its buffer */
1142
bool bret = print_out_password(proc->buffer,
1143
proc->buffer_length);
1145
perror("print_out_password");
1146
exitstatus = EX_IOERR;
1151
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
/* This process had nothing to say at this time */
1159
/* Before reading, make the process' data buffer large enough */
1160
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1165
exitstatus = EX_OSERR;
1168
proc->buffer_size += BUFFER_SIZE;
1170
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1173
+ proc->buffer_length,
1176
/* Read error from this process; ignore the error */
1184
proc->buffer_length += (size_t) sret;
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1194
/* Fallback if all plugins failed, none are found or an error
1197
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1198
char *passwordbuffer = getpass("Password: ");
1199
size_t len = strlen(passwordbuffer);
1200
/* Strip trailing newline */
1201
if(len > 0 and passwordbuffer[len-1] == '\n'){
1202
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1205
bret = print_out_password(passwordbuffer, len);
1207
perror("print_out_password");
1208
exitstatus = EX_IOERR;
1212
/* Restore old signal handler */
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1215
perror("sigaction");
1216
exitstatus = EX_OSERR;
1219
if(custom_argv != NULL){
1220
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1230
/* Kill the processes */
1231
for(plugin *p = plugin_list; p != NULL; p = p->next){
1234
ret = kill(p->pid, SIGTERM);
1235
if(ret == -1 and errno != ESRCH){
1236
/* Set-uid proccesses might not get closed */
1242
/* Wait for any remaining child processes to terminate */
1246
if(errno != ECHILD){