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- Committer: Teddy Hogeborn
- Date: 2008-09-06 16:33:08 UTC
- Revision ID: teddy@fukt.bsnet.se-20080906163308-ciy82qw6jollqrjd
* plugins.d/mandos-client.xml (NAME, OVERVIEW, EXIT STATUS): Improved
wording.
wording.
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
26
#include <stddef.h> /* size_t, NULL */
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
51
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
53
FD_CLOEXEC */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
55
#include <errno.h> /* errno */
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
62
sigaddset(), sigaction(),
63
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
66
67
67
#define BUFFER_SIZE 256
68
68
69
const char *argp_program_version = "mandos-client 1.0";
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner 1.0";
70
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
74
72
struct process;
73
74
typedef struct process{
75
struct plugin;
76
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
84
85
/* Variables used for running processes*/
75
86
pid_t pid;
76
87
int fd;
77
88
char *buffer;
78
89
size_t buffer_size;
79
90
size_t buffer_length;
80
91
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
92
volatile bool completed;
93
volatile int status;
91
94
struct plugin *next;
92
95
} plugin;
93
96
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
96
104
if ((p->name == name)
97
105
or (p->name and name and (strcmp(p->name, name) == 0))){
98
106
return p;
101
109
/* Create a new plugin */
102
110
plugin *new_plugin = malloc(sizeof(plugin));
103
111
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
108
127
new_plugin->argv = malloc(sizeof(char *) * 2);
109
128
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
112
132
}
113
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
114
134
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
118
145
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
120
147
return new_plugin;
121
148
}
122
149
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
183
if(p == NULL){
184
return false;
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
return add_to_char_array(def, &(p->environ), &(p->envc));
132
204
}
133
205
134
206
/*
147
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
220
}
149
221
150
process *process_list = NULL;
151
222
152
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
153
224
status. */
154
225
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
171
253
}
172
254
255
/* Prints out a password to stdout */
173
256
bool print_out_password(const char *buffer, size_t length){
174
257
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
178
258
for(size_t written = 0; written < length; written += (size_t)ret){
179
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
260
length - written));
185
265
return true;
186
266
}
187
267
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
292
}
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
302
}
303
188
304
int main(int argc, char *argv[]){
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
305
char *plugindir = NULL;
306
char *argfile = NULL;
307
FILE *conffp;
190
308
size_t d_name_len;
191
309
DIR *dir = NULL;
192
310
struct dirent *dirst;
200
318
struct sigaction old_sigchld_action;
201
319
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
320
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
321
char **custom_argv = NULL;
322
int custom_argc = 0;
323
206
324
/* Establish a signal handler */
207
325
sigemptyset(&sigchld_action.sa_mask);
208
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
327
if(ret == -1){
210
328
perror("sigaddset");
211
exit(EXIT_FAILURE);
329
exitstatus = EXIT_FAILURE;
330
goto fallback;
212
331
}
213
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
333
if(ret == -1){
215
334
perror("sigaction");
216
exit(EXIT_FAILURE);
335
exitstatus = EXIT_FAILURE;
336
goto fallback;
217
337
}
218
338
219
339
/* The options we understand. */
221
341
{ .name = "global-options", .key = 'g',
222
342
.arg = "OPTION[,OPTION[,...]]",
223
343
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
345
.arg = "VAR=value",
346
.doc = "Environment variable passed to all plugins" },
224
347
{ .name = "options-for", .key = 'o',
225
348
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
349
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
351
.arg = "PLUGIN:ENV=value",
352
.doc = "Environment variable passed to specified plugin" },
227
353
{ .name = "disable", .key = 'd',
228
354
.arg = "PLUGIN",
229
355
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
230
359
{ .name = "plugin-dir", .key = 128,
231
360
.arg = "DIRECTORY",
232
361
.doc = "Specify a different plugin directory", .group = 2 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
362
{ .name = "config-file", .key = 129,
363
.arg = "FILE",
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
241
373
{ .name = NULL }
242
374
};
243
375
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
248
378
switch (key) {
249
case 'g':
250
if (arg != NULL){
251
char *p = strtok(arg, ",");
252
do{
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
255
} while (p != NULL);
256
}
257
break;
258
case 'o':
259
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
262
if(p != NULL){
263
p = strtok(p, ",");
264
do{
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
267
} while (p != NULL);
268
}
269
}
270
break;
271
case 'd':
272
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
274
}
275
break;
276
case 128:
277
plugindir = arg;
278
break;
279
case 129:
379
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
389
}
390
}
391
}
392
break;
393
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
405
}
406
break;
407
case 'o': /* --options-for */
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
415
break;
416
}
417
char *p;
418
while((p = strsep(&opt, ",")) != NULL){
419
if(p[0] == '\0'){
420
continue;
421
}
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
425
}
426
}
427
}
428
break;
429
case 'E': /* --env-for */
430
if(arg == NULL){
431
break;
432
}
433
{
434
char *envdef = strchr(arg, ':');
435
if(envdef == NULL){
436
break;
437
}
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
439
if(p_name == NULL){
440
break;
441
}
442
envdef++;
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
445
}
446
}
447
break;
448
case 'd': /* --disable */
449
if (arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = true;
455
}
456
break;
457
case 'e': /* --enable */
458
if (arg != NULL){
459
plugin *p = getplugin(arg);
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
462
}
463
p->disabled = false;
464
}
465
break;
466
case 128: /* --plugin-dir */
467
plugindir = strdup(arg);
468
if(plugindir == NULL){
469
perror("strdup");
470
}
471
break;
472
case 129: /* --config-file */
473
/* This is already done by parse_opt_config_file() */
474
break;
475
case 130: /* --userid */
280
476
uid = (uid_t)strtol(arg, NULL, 10);
281
477
break;
282
case 130:
478
case 131: /* --groupid */
283
479
gid = (gid_t)strtol(arg, NULL, 10);
284
480
break;
285
case 131:
481
case 132: /* --debug */
286
482
debug = true;
287
483
break;
288
484
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
break;
487
case ARGP_KEY_END:
488
break;
489
default:
490
return ARGP_ERR_UNKNOWN;
491
}
492
return 0;
493
}
494
495
/* This option parser is the same as parse_opt() above, except it
496
ignores everything but the --config-file option. */
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
switch (key) {
501
case 'g': /* --global-options */
502
case 'G': /* --global-env */
503
case 'o': /* --options-for */
504
case 'E': /* --env-for */
505
case 'd': /* --disable */
506
case 'e': /* --enable */
507
case 128: /* --plugin-dir */
508
break;
509
case 129: /* --config-file */
510
argfile = strdup(arg);
511
if(argfile == NULL){
512
perror("strdup");
291
513
}
292
plus_options = arg;
293
break;
514
break;
515
case 130: /* --userid */
516
case 131: /* --groupid */
517
case 132: /* --debug */
518
case ARGP_KEY_ARG:
294
519
case ARGP_KEY_END:
295
520
break;
296
521
default:
299
524
return 0;
300
525
}
301
526
302
plugin *plugin_list = NULL;
303
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
527
struct argp argp = { .options = options,
528
.parser = parse_opt_config_file,
529
.args_doc = "",
306
530
.doc = "Mandos plugin runner -- Run plugins" };
307
531
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
532
/* Parse using the parse_opt_config_file in order to get the custom
533
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
309
535
if (ret == ARGP_ERR_UNKNOWN){
310
536
fprintf(stderr, "Unknown error while parsing arguments\n");
311
537
exitstatus = EXIT_FAILURE;
312
goto end;
538
goto fallback;
313
539
}
314
540
315
if(plus_options){
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
321
char *arg;
322
int new_argc = 1;
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
541
/* Reset to the normal argument parser */
542
argp.parser = parse_opt;
543
544
/* Open the configfile if available */
545
if (argfile == NULL){
546
conffp = fopen(AFILE, "r");
547
} else {
548
conffp = fopen(argfile, "r");
549
}
550
if(conffp != NULL){
551
char *org_line = NULL;
552
char *p, *arg, *new_arg, *line;
553
size_t size = 0;
554
ssize_t sret;
555
const char whitespace_delims[] = " \r\t\f\v\n";
556
const char comment_delim[] = "#";
557
558
custom_argc = 1;
559
custom_argv = malloc(sizeof(char*) * 2);
560
if(custom_argv == NULL){
325
561
perror("malloc");
326
562
exitstatus = EXIT_FAILURE;
327
goto end;
328
}
329
plus_argv[0] = argv[0];
330
plus_argv[1] = NULL;
331
arg = strtok(plus_options, delims); /* Get first argument */
332
while(arg != NULL){
333
new_argc++;
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
337
perror("realloc");
338
exitstatus = EXIT_FAILURE;
339
goto end;
340
}
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
344
}
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
563
goto fallback;
564
}
565
custom_argv[0] = argv[0];
566
custom_argv[1] = NULL;
567
568
/* for each line in the config file, strip whitespace and ignore
569
commented text */
570
while(true){
571
sret = getline(&org_line, &size, conffp);
572
if(sret == -1){
573
break;
574
}
575
576
line = org_line;
577
arg = strsep(&line, comment_delim);
578
while((p = strsep(&arg, whitespace_delims)) != NULL){
579
if(p[0] == '\0'){
580
continue;
581
}
582
new_arg = strdup(p);
583
if(new_arg == NULL){
584
perror("strdup");
585
exitstatus = EXIT_FAILURE;
586
free(org_line);
587
goto fallback;
588
}
589
590
custom_argc += 1;
591
custom_argv = realloc(custom_argv, sizeof(char *)
592
* ((unsigned int) custom_argc + 1));
593
if(custom_argv == NULL){
594
perror("realloc");
595
exitstatus = EXIT_FAILURE;
596
free(org_line);
597
goto fallback;
598
}
599
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
601
}
602
}
603
free(org_line);
604
} else {
605
/* Check for harmful errors and go to fallback. Other errors might
606
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
608
perror("fopen");
609
exitstatus = EXIT_FAILURE;
610
goto fallback;
611
}
612
}
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
615
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
617
0, NULL);
346
618
if (ret == ARGP_ERR_UNKNOWN){
347
619
fprintf(stderr, "Unknown error while parsing arguments\n");
348
620
exitstatus = EXIT_FAILURE;
349
goto end;
621
goto fallback;
350
622
}
351
623
}
352
624
625
/* Parse actual command line arguments, to let them override the
626
config file */
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
631
goto fallback;
632
}
633
353
634
if(debug){
354
635
for(plugin *p = plugin_list; p != NULL; p=p->next){
355
636
fprintf(stderr, "Plugin: %s has %d arguments\n",
357
638
for(char **a = p->argv; *a != NULL; a++){
358
639
fprintf(stderr, "\tArg: %s\n", *a);
359
640
}
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
642
for(char **a = p->environ; *a != NULL; a++){
643
fprintf(stderr, "\t%s\n", *a);
644
}
360
645
}
361
646
}
362
647
648
/* Strip permissions down to nobody */
363
649
ret = setuid(uid);
364
650
if (ret == -1){
365
651
perror("setuid");
366
}
367
652
}
368
653
setgid(gid);
369
654
if (ret == -1){
370
655
perror("setgid");
371
656
}
372
657
373
dir = opendir(plugindir);
658
if (plugindir == NULL){
659
dir = opendir(PDIR);
660
} else {
661
dir = opendir(plugindir);
662
}
663
374
664
if(dir == NULL){
375
665
perror("Could not open plugin dir");
376
666
exitstatus = EXIT_FAILURE;
377
goto end;
667
goto fallback;
378
668
}
379
669
380
670
/* Set the FD_CLOEXEC flag on the directory, if possible */
385
675
if(ret < 0){
386
676
perror("set_cloexec_flag");
387
677
exitstatus = EXIT_FAILURE;
388
goto end;
678
goto fallback;
389
679
}
390
680
}
391
681
}
392
682
393
683
FD_ZERO(&rfds_all);
394
684
685
/* Read and execute any executable in the plugin directory*/
395
686
while(true){
396
687
dirst = readdir(dir);
397
688
398
// All directory entries have been processed
689
/* All directory entries have been processed */
399
690
if(dirst == NULL){
400
691
if (errno == EBADF){
401
692
perror("readdir");
402
693
exitstatus = EXIT_FAILURE;
403
goto end;
694
goto fallback;
404
695
}
405
696
break;
406
697
}
407
698
408
699
d_name_len = strlen(dirst->d_name);
409
700
410
// Ignore dotfiles, backup files and other junk
701
/* Ignore dotfiles, backup files and other junk */
411
702
{
412
703
bool bad_name = false;
413
704
428
719
break;
429
720
}
430
721
}
431
432
722
if(bad_name){
433
723
continue;
434
724
}
435
436
725
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
726
size_t suf_len = strlen(*suf);
438
727
if((d_name_len >= suf_len)
451
740
continue;
452
741
}
453
742
}
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
743
744
char *filename;
745
if(plugindir == NULL){
746
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
747
} else {
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
}
750
if(ret < 0){
751
perror("asprintf");
458
752
continue;
459
753
}
460
strcpy(filename, plugindir); /* Spurious warning */
461
strcat(filename, "/"); /* Spurious warning */
462
strcat(filename, dirst->d_name); /* Spurious warning */
463
754
464
755
ret = stat(filename, &st);
465
756
if (ret == -1){
467
758
free(filename);
468
759
continue;
469
760
}
470
761
762
/* Ignore non-executable files */
471
763
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
472
764
if(debug){
473
765
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
476
768
free(filename);
477
769
continue;
478
770
}
479
if(getplugin(dirst->d_name, &plugin_list)->disabled){
771
772
plugin *p = getplugin(dirst->d_name);
773
if(p == NULL){
774
perror("getplugin");
775
free(filename);
776
continue;
777
}
778
if(p->disabled){
480
779
if(debug){
481
780
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
482
781
dirst->d_name);
484
783
free(filename);
485
784
continue;
486
785
}
487
plugin *p = getplugin(dirst->d_name, &plugin_list);
488
786
{
489
787
/* Add global arguments to argument list for this plugin */
490
plugin *g = getplugin(NULL, &plugin_list);
491
for(char **a = g->argv + 1; *a != NULL; a++){
492
addargument(p, *a);
493
}
494
}
495
int pipefd[2];
788
plugin *g = getplugin(NULL);
789
if(g != NULL){
790
for(char **a = g->argv + 1; *a != NULL; a++){
791
if(not add_argument(p, *a)){
792
perror("add_argument");
793
}
794
}
795
/* Add global environment variables */
796
for(char **e = g->environ; *e != NULL; e++){
797
if(not add_environment(p, *e, false)){
798
perror("add_environment");
799
}
800
}
801
}
802
}
803
/* If this plugin has any environment variables, we will call
804
using execve and need to duplicate the environment from this
805
process, too. */
806
if(p->environ[0] != NULL){
807
for(char **e = environ; *e != NULL; e++){
808
if(not add_environment(p, *e, false)){
809
perror("add_environment");
810
}
811
}
812
}
813
814
int pipefd[2];
496
815
ret = pipe(pipefd);
497
816
if (ret == -1){
498
817
perror("pipe");
499
818
exitstatus = EXIT_FAILURE;
500
goto end;
819
goto fallback;
501
820
}
821
/* Ask OS to automatic close the pipe on exec */
502
822
ret = set_cloexec_flag(pipefd[0]);
503
823
if(ret < 0){
504
824
perror("set_cloexec_flag");
505
825
exitstatus = EXIT_FAILURE;
506
goto end;
826
goto fallback;
507
827
}
508
828
ret = set_cloexec_flag(pipefd[1]);
509
829
if(ret < 0){
510
830
perror("set_cloexec_flag");
511
831
exitstatus = EXIT_FAILURE;
512
goto end;
832
goto fallback;
513
833
}
514
834
/* Block SIGCHLD until process is safely in process list */
515
835
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
516
836
if(ret < 0){
517
837
perror("sigprocmask");
518
838
exitstatus = EXIT_FAILURE;
519
goto end;
839
goto fallback;
520
840
}
521
// Starting a new process to be watched
841
/* Starting a new process to be watched */
522
842
pid_t pid = fork();
523
843
if(pid == -1){
524
844
perror("fork");
525
845
exitstatus = EXIT_FAILURE;
526
goto end;
846
goto fallback;
527
847
}
528
848
if(pid == 0){
529
849
/* this is the child process */
549
869
above and must now close it manually here. */
550
870
closedir(dir);
551
871
}
552
if(execv(filename, p->argv) < 0){
553
perror("execv");
554
_exit(EXIT_FAILURE);
872
if(p->environ[0] == NULL){
873
if(execv(filename, p->argv) < 0){
874
perror("execv");
875
_exit(EXIT_FAILURE);
876
}
877
} else {
878
if(execve(filename, p->argv, p->environ) < 0){
879
perror("execve");
880
_exit(EXIT_FAILURE);
881
}
555
882
}
556
883
/* no return */
557
884
}
558
/* parent process */
885
/* Parent process */
886
close(pipefd[1]); /* Close unused write end of pipe */
559
887
free(filename);
560
close(pipefd[1]); /* close unused write end of pipe */
561
process *new_process = malloc(sizeof(process));
562
if (new_process == NULL){
563
perror("malloc");
888
plugin *new_plugin = getplugin(dirst->d_name);
889
if (new_plugin == NULL){
890
perror("getplugin");
564
891
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
565
892
if(ret < 0){
566
perror("sigprocmask");
893
perror("sigprocmask");
567
894
}
568
895
exitstatus = EXIT_FAILURE;
569
goto end;
896
goto fallback;
570
897
}
571
898
572
*new_process = (struct process){ .pid = pid,
573
.fd = pipefd[0],
574
.next = process_list };
575
// List handling
576
process_list = new_process;
899
new_plugin->pid = pid;
900
new_plugin->fd = pipefd[0];
901
577
902
/* Unblock SIGCHLD so signal handler can be run if this process
578
903
has already completed */
579
904
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
905
if(ret < 0){
581
906
perror("sigprocmask");
582
907
exitstatus = EXIT_FAILURE;
583
goto end;
584
}
585
586
FD_SET(new_process->fd, &rfds_all);
587
588
if (maxfd < new_process->fd){
589
maxfd = new_process->fd;
590
}
591
592
}
593
594
/* Free the plugin list */
595
for(plugin *next; plugin_list != NULL; plugin_list = next){
596
next = plugin_list->next;
597
free(plugin_list->argv);
598
free(plugin_list);
908
goto fallback;
909
}
910
911
FD_SET(new_plugin->fd, &rfds_all);
912
913
if (maxfd < new_plugin->fd){
914
maxfd = new_plugin->fd;
915
}
916
599
917
}
600
918
601
919
closedir(dir);
602
920
dir = NULL;
603
604
if (process_list == NULL){
605
fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
" directory?\n");
607
process_list = NULL;
921
922
for(plugin *p = plugin_list; p != NULL; p = p->next){
923
if(p->pid != 0){
924
break;
925
}
926
if(p->next == NULL){
927
fprintf(stderr, "No plugin processes started. Incorrect plugin"
928
" directory?\n");
929
free_plugin_list();
930
}
608
931
}
609
while(process_list){
932
933
/* Main loop while running plugins exist */
934
while(plugin_list){
610
935
fd_set rfds = rfds_all;
611
936
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
612
937
if (select_ret == -1){
613
938
perror("select");
614
939
exitstatus = EXIT_FAILURE;
615
goto end;
940
goto fallback;
616
941
}
617
942
/* OK, now either a process completed, or something can be read
618
943
from one of them */
619
for(process *proc = process_list; proc ; proc = proc->next){
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
620
945
/* Is this process completely done? */
621
946
if(proc->eof and proc->completed){
622
947
/* Only accept the plugin output if it exited cleanly */
623
948
if(not WIFEXITED(proc->status)
624
949
or WEXITSTATUS(proc->status) != 0){
625
950
/* Bad exit by plugin */
951
626
952
if(debug){
627
953
if(WIFEXITED(proc->status)){
628
954
fprintf(stderr, "Plugin %u exited with status %d\n",
637
963
(unsigned int) (proc->pid));
638
964
}
639
965
}
966
640
967
/* Remove the plugin */
641
968
FD_CLR(proc->fd, &rfds_all);
969
642
970
/* Block signal while modifying process_list */
643
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
971
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
644
972
if(ret < 0){
645
973
perror("sigprocmask");
646
974
exitstatus = EXIT_FAILURE;
647
goto end;
648
}
649
/* Delete this process entry from the list */
650
if(process_list == proc){
651
/* First one - simple */
652
process_list = proc->next;
653
} else {
654
/* Second one or later */
655
for(process *p = process_list; p != NULL; p = p->next){
656
if(p->next == proc){
657
p->next = proc->next;
658
break;
659
}
660
}
661
}
975
goto fallback;
976
}
977
free_plugin(proc);
662
978
/* We are done modifying process list, so unblock signal */
663
979
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
664
980
NULL);
665
981
if(ret < 0){
666
982
perror("sigprocmask");
667
}
668
free(proc->buffer);
669
free(proc);
670
/* We deleted this process from the list, so we can't go
671
proc->next. Therefore, start over from the beginning of
672
the process list */
673
break;
983
exitstatus = EXIT_FAILURE;
984
goto fallback;
985
}
986
987
if(plugin_list == NULL){
988
break;
989
}
990
continue;
674
991
}
992
675
993
/* This process exited nicely, so print its buffer */
676
994
677
bool bret = print_out_password(proc->buffer, proc->buffer_length);
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
678
997
if(not bret){
679
998
perror("print_out_password");
680
999
exitstatus = EXIT_FAILURE;
681
1000
}
682
goto end;
1001
goto fallback;
683
1002
}
1003
684
1004
/* This process has not completed. Does it have any output? */
685
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
686
1006
/* This process had nothing to say at this time */
693
1013
if (proc->buffer == NULL){
694
1014
perror("malloc");
695
1015
exitstatus = EXIT_FAILURE;
696
goto end;
1016
goto fallback;
697
1017
}
698
1018
proc->buffer_size += BUFFER_SIZE;
699
1019
}
714
1034
}
715
1035
716
1036
717
end:
1037
fallback:
718
1038
719
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
720
/* Fallback if all plugins failed, none are found or an error occured */
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1041
occured */
721
1042
bool bret;
722
1043
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
723
1044
char *passwordbuffer = getpass("Password: ");
724
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1045
size_t len = strlen(passwordbuffer);
1046
/* Strip trailing newline */
1047
if(len > 0 and passwordbuffer[len-1] == '\n'){
1048
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1049
len--;
1050
}
1051
bret = print_out_password(passwordbuffer, len);
725
1052
if(not bret){
726
1053
perror("print_out_password");
727
1054
exitstatus = EXIT_FAILURE;
728
goto end;
729
1055
}
730
1056
}
731
1057
732
1058
/* Restore old signal handler */
733
sigaction(SIGCHLD, &old_sigchld_action, NULL);
734
735
free(plus_argv);
736
737
/* Free the plugin list */
738
for(plugin *next; plugin_list != NULL; plugin_list = next){
739
next = plugin_list->next;
740
free(plugin_list->argv);
741
free(plugin_list);
1059
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
if(ret == -1){
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1063
}
1064
1065
if(custom_argv != NULL){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
free(*arg);
1068
}
1069
free(custom_argv);
742
1070
}
743
1071
744
1072
if(dir != NULL){
746
1074
}
747
1075
748
1076
/* Free the process list and kill the processes */
749
for(process *next; process_list != NULL; process_list = next){
750
next = process_list->next;
751
close(process_list->fd);
752
ret = kill(process_list->pid, SIGTERM);
753
if(ret == -1 and errno != ESRCH){
754
/* set-uid proccesses migth not get closed */
755
perror("kill");
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
if(p->pid != 0){
1079
close(p->fd);
1080
ret = kill(p->pid, SIGTERM);
1081
if(ret == -1 and errno != ESRCH){
1082
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1084
}
756
1085
}
757
free(process_list->buffer);
758
free(process_list);
759
1086
}
760
1087
761
1088
/* Wait for any remaining child processes to terminate */
765
1092
if(errno != ECHILD){
766
1093
perror("wait");
767
1094
}
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
768
1100
769
1101
return exitstatus;
770
1102
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0