19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
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@fukt.bsnet.se>";
84
typedef struct plugin{
85
char *name; /* can be NULL or any plugin name */
92
/* Variables used for running processes*/
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{
96
50
size_t buffer_size;
97
51
size_t buffer_length;
99
volatile sig_atomic_t completed;
55
typedef struct plugin{
56
char *name; /* can be "global" and any plugin name */
101
60
struct plugin *next;
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))){
63
plugin *getplugin(char *name, plugin **plugin_list){
64
for (plugin *p = *plugin_list; p != NULL; p = p->next){
66
or (p->name and name and (strcmp(p->name, name) == 0))){
116
70
/* Create a new plugin */
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;
71
plugin *new_plugin = malloc(sizeof(plugin));
72
if (new_plugin == NULL){
76
new_plugin->name = name;
77
new_plugin->argv = malloc(sizeof(char *) * 2);
78
if (new_plugin->argv == NULL){
82
new_plugin->argv[0] = name;
153
83
new_plugin->argv[1] = NULL;
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;
85
new_plugin->disable = false;
86
new_plugin->next = *plugin_list;
168
87
/* Append the new plugin to the list */
169
plugin_list = new_plugin;
88
*plugin_list = new_plugin;
170
89
return new_plugin;
173
/* Helper function for add_argument and add_environment */
174
static bool add_to_char_array(const char *new, char ***array,
176
/* Resize the pointed-to array to hold one more pointer */
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
185
/* Make a copy of the new string */
189
} while(copy == NULL and errno == EINTR);
193
/* Insert the copy */
194
(*array)[*len] = copy;
196
/* Add a new terminating NULL pointer to the last element */
197
(*array)[*len] = NULL;
201
/* Add to a plugin's argument vector */
202
static bool add_argument(plugin *p, const char *arg){
206
return add_to_char_array(arg, &(p->argv), &(p->argc));
209
/* Add to a plugin's environment */
210
static bool add_environment(plugin *p, const char *def, bool replace){
214
/* namelen = length of name of environment variable */
215
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
219
/* It already exists */
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
234
return add_to_char_array(def, &(p->environ), &(p->envc));
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
244
/* If reading the flags failed, return error indication now. */
248
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
254
/* Mark processes as completed when they exit, and save their exit
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
259
plugin *proc = plugin_list;
261
pid_t pid = waitpid(-1, &status, WNOHANG);
263
/* Only still running child processes */
268
/* No child processes */
271
error(0, errno, "waitpid");
274
/* A child exited, find it in process_list */
275
while(proc != NULL and proc->pid != pid){
279
/* Process not found in process list */
282
proc->status = status;
288
/* Prints out a password to stdout */
289
static bool print_out_password(const char *buffer, size_t length){
291
for(size_t written = 0; written < length; written += (size_t)ret){
292
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
301
/* Removes and free a plugin from the plugin list */
302
static void free_plugin(plugin *plugin_node){
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
307
free(plugin_node->argv);
308
for(char **env = plugin_node->environ; *env != NULL; env++){
311
free(plugin_node->environ);
312
free(plugin_node->buffer);
314
/* Removes the plugin from the singly-linked list */
315
if(plugin_node == plugin_list){
316
/* First one - simple */
317
plugin_list = plugin_list->next;
319
/* Second one or later */
320
for(plugin *p = plugin_list; p != NULL; p = p->next){
321
if(p->next == plugin_node){
322
p->next = plugin_node->next;
331
static void free_plugin_list(void){
332
while(plugin_list != NULL){
333
free_plugin(plugin_list);
92
void addarguments(plugin *p, char *arg){
93
p->argv[p->argc] = arg;
94
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
100
p->argv[p->argc] = NULL;
103
#define BUFFER_SIZE 256
105
const char *argp_program_version =
106
"plugbasedclient 0.9";
107
const char *argp_program_bug_address =
108
"<mandos@fukt.bsnet.se>";
110
"Mandos plugin runner -- Run Mandos plugins";
111
/* A description of the arguments we accept. */
112
static char args_doc[] = "";
337
114
int main(int argc, char *argv[]){
338
char *plugindir = NULL;
339
char *argfile = NULL;
115
const char *plugindir = "plugins.d";
341
116
size_t d_name_len;
343
118
struct dirent *dirst;
346
121
int ret, maxfd = 0;
122
process *process_list = NULL;
348
123
uid_t uid = 65534;
349
124
gid_t gid = 65534;
351
int exitstatus = EXIT_SUCCESS;
352
struct sigaction old_sigchld_action;
353
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
354
.sa_flags = SA_NOCLDSTOP };
355
char **custom_argv = NULL;
358
/* Establish a signal handler */
359
sigemptyset(&sigchld_action.sa_mask);
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
373
125
/* The options we understand. */
374
126
struct argp_option options[] = {
375
127
{ .name = "global-options", .key = 'g',
376
.arg = "OPTION[,OPTION[,...]]",
377
.doc = "Options passed to all plugins" },
378
{ .name = "global-env", .key = 'G',
380
.doc = "Environment variable passed to all plugins" },
128
.arg = "option[,option[,...]]", .flags = 0,
129
.doc = "Options effecting all plugins" },
381
130
{ .name = "options-for", .key = 'o',
382
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
383
.doc = "Options passed only to specified plugin" },
384
{ .name = "env-for", .key = 'E',
385
.arg = "PLUGIN:ENV=value",
386
.doc = "Environment variable passed to specified plugin" },
387
{ .name = "disable", .key = 'd',
389
.doc = "Disable a specific plugin", .group = 1 },
390
{ .name = "enable", .key = 'e',
392
.doc = "Enable a specific plugin", .group = 1 },
131
.arg = "plugin:option[,option[,...]]", .flags = 0,
132
.doc = "Options effecting only specified plugins" },
133
{ .name = "disable-plugin", .key = 'd',
134
.arg = "Plugin[,Plugin[,...]]", .flags = 0,
135
.doc = "Option to disable specififed plugins" },
393
136
{ .name = "plugin-dir", .key = 128,
395
.doc = "Specify a different plugin directory", .group = 2 },
396
{ .name = "config-file", .key = 129,
398
.doc = "Specify a different configuration file", .group = 2 },
399
{ .name = "userid", .key = 130,
400
.arg = "ID", .flags = 0,
401
.doc = "User ID the plugins will run as", .group = 3 },
402
{ .name = "groupid", .key = 131,
403
.arg = "ID", .flags = 0,
404
.doc = "Group ID the plugins will run as", .group = 3 },
405
{ .name = "debug", .key = 132,
406
.doc = "Debug mode", .group = 4 },
408
* These reproduce what we would get without ARGP_NO_HELP
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
137
.arg = "Directory", .flags = 0,
138
.doc = "Option to change directory to search for plugins" },
139
{ .name = "userid", .key = 129,
140
.arg = "Id", .flags = 0,
141
.doc = "Option to change which user id the plugins will run as" },
142
{ .name = "groupid", .key = 130,
143
.arg = "Id", .flags = 0,
144
.doc = "Option to change which group id the plugins will run as" },
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
424
case 'g': /* --global-options */
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
434
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
437
case 'o': /* --options-for */
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
448
argp_error(state, "Empty plugin name");
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
460
case 'E': /* --env-for */
462
char *envdef = strchr(arg, ':');
464
argp_error(state, "No colon in \"%s\"", arg);
471
argp_error(state, "Empty plugin name");
475
add_environment(getplugin(arg), envdef, true);
478
case 'd': /* --disable */
480
plugin *p = getplugin(arg);
486
case 'e': /* --enable */
488
plugin *p = getplugin(arg);
494
case 128: /* --plugin-dir */
496
plugindir = strdup(arg);
498
case 129: /* --config-file */
499
/* This is already done by parse_opt_config_file() */
501
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
511
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
521
case 132: /* --debug */
525
* These reproduce what we would get without ARGP_NO_HELP
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
543
/* Cryptsetup always passes an argument, which is an empty
544
string if "none" was specified in /etc/crypttab. So if
545
argument was empty, we ignore it silently. */
550
return ARGP_ERR_UNKNOWN;
552
return errno; /* Set to 0 at start */
555
/* This option parser is the same as parse_opt() above, except it
556
ignores everything but the --config-file option. */
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
562
case 'g': /* --global-options */
563
case 'G': /* --global-env */
564
case 'o': /* --options-for */
565
case 'E': /* --env-for */
566
case 'd': /* --disable */
567
case 'e': /* --enable */
568
case 128: /* --plugin-dir */
570
case 129: /* --config-file */
572
argfile = strdup(arg);
574
case 130: /* --userid */
575
case 131: /* --groupid */
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
583
return ARGP_ERR_UNKNOWN;
588
struct argp argp = { .options = options,
589
.parser = parse_opt_config_file,
591
.doc = "Mandos plugin runner -- Run plugins" };
593
/* Parse using parse_opt_config_file() in order to get the custom
594
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
608
exitstatus = EX_USAGE;
612
/* Reset to the normal argument parser */
613
argp.parser = parse_opt;
615
/* Open the configfile if available */
617
conffp = fopen(AFILE, "r");
619
conffp = fopen(argfile, "r");
622
char *org_line = NULL;
623
char *p, *arg, *new_arg, *line;
625
const char whitespace_delims[] = " \r\t\f\v\n";
626
const char comment_delim[] = "#";
629
custom_argv = malloc(sizeof(char*) * 2);
630
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
635
custom_argv[0] = argv[0];
636
custom_argv[1] = NULL;
638
/* for each line in the config file, strip whitespace and ignore
641
sret = getline(&org_line, &size, conffp);
647
arg = strsep(&line, comment_delim);
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
661
custom_argv = realloc(custom_argv, sizeof(char *)
662
* ((unsigned int) custom_argc + 1));
663
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
669
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
683
/* Check for harmful errors and go to fallback. Other errors might
684
not affect opening plugins */
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
693
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
707
exitstatus = EX_CONFIG;
712
/* Parse actual command line arguments, to let them override the
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
727
exitstatus = EX_USAGE;
732
for(plugin *p = plugin_list; p != NULL; p=p->next){
733
fprintf(stderr, "Plugin: %s has %d arguments\n",
734
p->name ? p->name : "Global", p->argc - 1);
735
for(char **a = p->argv; *a != NULL; a++){
736
fprintf(stderr, "\tArg: %s\n", *a);
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
739
for(char **a = p->environ; *a != NULL; a++){
740
fprintf(stderr, "\t%s\n", *a);
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
754
error(0, errno, "fstat");
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
759
error(0, errno, "fchown");
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
767
/* Lower permissions */
148
error_t parse_opt (int key, char *arg, struct argp_state *state) {
149
/* Get the INPUT argument from `argp_parse', which we
150
know is a pointer to our arguments structure. */
151
plugin **plugins = state->input;
155
char *p = strtok(arg, ",");
157
addarguments(getplugin(NULL, plugins), p);
158
p = strtok(NULL, ",");
164
char *name = strtok(arg, ":");
165
char *p = strtok(NULL, ":");
168
addarguments(getplugin(name, plugins), p);
169
p = strtok(NULL, ",");
175
char *p = strtok(arg, ",");
177
getplugin(p, plugins)->disable = true;
178
p = strtok(NULL, ",");
186
uid = (uid_t)strtol(arg, NULL, 10);
189
gid = (gid_t)strtol(arg, NULL, 10);
197
return ARGP_ERR_UNKNOWN;
202
plugin *plugin_list = NULL;
204
struct argp argp = { .options = options, .parser = parse_opt,
205
.args_doc = args_doc, .doc = doc };
207
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
209
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
210
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
211
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
212
/* fprintf(stderr, "\tArg: %s\n", *a); */
770
error(0, errno, "setgid");
774
error(0, errno, "setuid");
777
/* Open plugin directory with close_on_exec flag */
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
784
#else /* not O_CLOEXEC */
786
#endif /* not O_CLOEXEC */
789
dir_fd = open(plugindir, O_RDONLY |
792
#else /* not O_CLOEXEC */
794
#endif /* not O_CLOEXEC */
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
812
#endif /* O_CLOEXEC */
814
dir = fdopendir(dir_fd);
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
825
/* Read and execute any executable in the plugin directory*/
228
dir = opendir(plugindir);
231
fprintf(stderr, "Can not open directory\n");
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
238
dirst = readdir(dir);
831
/* All directory entries have been processed */
240
// All directory entries have been processed
832
241
if(dirst == NULL){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
841
245
d_name_len = strlen(dirst->d_name);
843
/* Ignore dotfiles, backup files and other junk */
845
bool bad_name = false;
847
const char const *bad_prefixes[] = { ".", "#", NULL };
849
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
852
".dpkg-divert", NULL };
853
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
854
size_t pre_len = strlen(*pre);
855
if((d_name_len >= pre_len)
856
and strncmp((dirst->d_name), *pre, pre_len) == 0){
858
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
859
" with bad prefix %s\n", dirst->d_name, *pre);
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
size_t suf_len = strlen(*suf);
870
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
875
" with bad suffix %s\n", dirst->d_name, *suf);
888
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
897
error(0, errno, "asprintf");
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
903
error(0, errno, "stat");
908
/* Ignore non-executable files */
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
" with bad type or mode\n", filename);
919
plugin *p = getplugin(dirst->d_name);
921
error(0, errno, "getplugin");
927
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
934
/* Add global arguments to argument list for this plugin */
935
plugin *g = getplugin(NULL);
247
// Ignore dotfiles and backup files
248
if (dirst->d_name[0] == '.'
249
or dirst->d_name[d_name_len - 1] == '~'){
253
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
254
strcpy(filename, plugindir);
255
strcat(filename, "/");
256
strcat(filename, dirst->d_name);
260
if (S_ISREG(st.st_mode)
261
and (access(filename, X_OK) == 0)
262
and not (getplugin(dirst->d_name, &plugin_list)->disable)){
263
// Starting a new process to be watched
264
process *new_process = malloc(sizeof(process));
271
new_process->pid = fork();
272
if(new_process->pid == 0){
273
/* this is the child process */
275
close(pipefd[0]); /* close unused read end of pipe */
276
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
278
plugin *p = getplugin(dirst->d_name, &plugin_list);
279
plugin *g = getplugin(NULL, &plugin_list);
937
280
for(char **a = g->argv + 1; *a != NULL; a++){
938
if(not add_argument(p, *a)){
939
error(0, errno, "add_argument");
942
/* Add global environment variables */
943
for(char **e = g->environ; *e != NULL; e++){
944
if(not add_environment(p, *e, false)){
945
error(0, errno, "add_environment");
950
/* If this plugin has any environment variables, we will call
951
using execve and need to duplicate the environment from this
953
if(p->environ[0] != NULL){
954
for(char **e = environ; *e != NULL; e++){
955
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
968
/* Ask OS to automatic close the pipe on exec */
969
ret = set_cloexec_flag(pipefd[0]);
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
975
ret = set_cloexec_flag(pipefd[1]);
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
981
/* Block SIGCHLD until process is safely in process list */
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
990
/* Starting a new process to be watched */
994
} while(pid == -1 and errno == EINTR);
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
1001
/* this is the child process */
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1004
error(0, errno, "sigaction");
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1009
error(0, errno, "sigprocmask");
1013
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1015
error(0, errno, "dup2");
1020
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1021
above and must now close it manually here. */
1024
if(p->environ[0] == NULL){
1025
283
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1030
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1037
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1041
plugin *new_plugin = getplugin(dirst->d_name);
1042
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1048
error(0, errno, "sigprocmask");
1050
exitstatus = EX_OSERR;
1054
new_plugin->pid = pid;
1055
new_plugin->fd = pipefd[0];
1057
/* Unblock SIGCHLD so signal handler can be run if this process
1058
has already completed */
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1071
if(maxfd < new_plugin->fd){
1072
maxfd = new_plugin->fd;
1076
TEMP_FAILURE_RETRY(closedir(dir));
1078
free_plugin(getplugin(NULL));
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
290
close(pipefd[1]); /* close unused write end of pipe */
291
new_process->fd = pipefd[0];
292
new_process->buffer = malloc(BUFFER_SIZE);
293
if (new_process->buffer == NULL){
297
new_process->buffer_size = BUFFER_SIZE;
298
new_process->buffer_length = 0;
299
FD_SET(new_process->fd, &rfds_orig);
301
if (maxfd < new_process->fd){
302
maxfd = new_process->fd;
306
new_process->next = process_list;
307
process_list = new_process;
313
if (process_list != NULL){
315
fd_set rfds = rfds_orig;
316
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
317
if (select_ret == -1){
321
for(process *process_itr = process_list; process_itr != NULL;
322
process_itr = process_itr->next){
323
if(FD_ISSET(process_itr->fd, &rfds)){
324
if(process_itr->buffer_length + BUFFER_SIZE
325
> process_itr->buffer_size){
326
process_itr->buffer = realloc(process_itr->buffer,
327
process_itr->buffer_size
328
+ (size_t) BUFFER_SIZE);
329
if (process_itr->buffer == NULL){
333
process_itr->buffer_size += BUFFER_SIZE;
335
ret = read(process_itr->fd, process_itr->buffer
336
+ process_itr->buffer_length, BUFFER_SIZE);
338
/* Read error from this process; ignore it */
341
process_itr->buffer_length += (size_t) ret;
344
/* wait for process exit */
346
waitpid(process_itr->pid, &status, 0);
347
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
348
for(size_t written = 0;
349
written < process_itr->buffer_length;){
350
ret = write(STDOUT_FILENO,
351
process_itr->buffer + written,
352
process_itr->buffer_length - written);
357
written += (size_t)ret;
361
FD_CLR(process_itr->fd, &rfds_orig);
371
for(process *process_itr = process_list; process_itr != NULL;
372
process_itr = process_itr->next){
373
close(process_itr->fd);
374
kill(process_itr->pid, SIGTERM);
375
free(process_itr->buffer);
1084
if(p->next == NULL){
1085
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1091
/* Main loop while running plugins exist */
1093
fd_set rfds = rfds_all;
1094
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
1100
/* OK, now either a process completed, or something can be read
1102
for(plugin *proc = plugin_list; proc != NULL;){
1103
/* Is this process completely done? */
1104
if(proc->completed and proc->eof){
1105
/* Only accept the plugin output if it exited cleanly */
1106
if(not WIFEXITED(proc->status)
1107
or WEXITSTATUS(proc->status) != 0){
1108
/* Bad exit by plugin */
1111
if(WIFEXITED(proc->status)){
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1113
" status %d\n", proc->name,
1114
(intmax_t) (proc->pid),
1115
WEXITSTATUS(proc->status));
1116
} else if(WIFSIGNALED(proc->status)){
1117
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1118
" signal %d: %s\n", proc->name,
1119
(intmax_t) (proc->pid),
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
1122
} else if(WCOREDUMP(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
1128
/* Remove the plugin */
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1132
/* Block signal while modifying process_list */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1135
&sigchld_action.sa_mask,
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
1143
plugin *next_plugin = proc->next;
1147
/* We are done modifying process list, so unblock signal */
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1157
if(plugin_list == NULL){
1164
/* This process exited nicely, so print its buffer */
1166
bool bret = print_out_password(proc->buffer,
1167
proc->buffer_length);
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
1175
/* This process has not completed. Does it have any output? */
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1179
/* This process had nothing to say at this time */
1183
/* Before reading, make the process' data buffer large enough */
1184
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
+ (size_t) BUFFER_SIZE);
1187
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1192
proc->buffer_size += BUFFER_SIZE;
1194
/* Read from the process */
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1197
+ proc->buffer_length,
1200
/* Read error from this process; ignore the error */
1208
proc->buffer_length += (size_t) sret;
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1218
/* Fallback if all plugins failed, none are found or an error
1221
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1222
char *passwordbuffer = getpass("Password: ");
1223
size_t len = strlen(passwordbuffer);
1224
/* Strip trailing newline */
1225
if(len > 0 and passwordbuffer[len-1] == '\n'){
1226
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1229
bret = print_out_password(passwordbuffer, len);
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1236
/* Restore old signal handler */
1237
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1243
if(custom_argv != NULL){
1244
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1254
/* Kill the processes */
1255
for(plugin *p = plugin_list; p != NULL; p = p->next){
1258
ret = kill(p->pid, SIGTERM);
1259
if(ret == -1 and errno != ESRCH){
1260
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
1266
/* Wait for any remaining child processes to terminate */
1270
if(errno != ECHILD){
1271
error(0, errno, "wait");