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- Committer: Björn Påhlsson
- Date: 2008-08-12 16:29:05 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 69.
- Revision ID: belorn@braxen-20080812162905-6zm7vdvj81wkumwb
mandos-client
Better error handling for failing to start plugins
Handle fork errors
password-request
correct exit routine
Better error handling for failing to start plugins
Handle fork errors
password-request
correct exit routine
- files added:
- network-protocol.txt
- files removed:
- .bzrignore
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- files modified:
- Makefile
added
removed
mandos-client.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
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> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
55
56
#include <errno.h> /* errno */
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, 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
#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";
69
const char *argp_program_version = "mandos-client 1.0";
73
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
71
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*/
72
struct process;
73
74
typedef struct process{
86
75
pid_t pid;
87
76
int fd;
88
77
char *buffer;
89
78
size_t buffer_size;
90
79
size_t buffer_length;
91
80
bool eof;
92
volatile bool completed;
93
volatile int status;
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;
94
91
struct plugin *next;
95
92
} plugin;
96
93
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){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
96
if ((p->name == name)
105
97
or (p->name and name and (strcmp(p->name, name) == 0))){
106
98
return p;
109
101
/* Create a new plugin */
110
102
plugin *new_plugin = malloc(sizeof(plugin));
111
103
if (new_plugin == NULL){
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
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
127
108
new_plugin->argv = malloc(sizeof(char *) * 2);
128
109
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
110
perror("malloc");
111
exit(EXIT_FAILURE);
132
112
}
133
new_plugin->argv[0] = copy_name;
113
new_plugin->argv[0] = name;
134
114
new_plugin->argv[1] = NULL;
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
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
145
118
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
147
120
return new_plugin;
148
121
}
149
122
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));
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;
204
132
}
205
133
206
134
/*
219
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
148
}
221
149
150
process *process_list = NULL;
222
151
223
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
224
153
status. */
225
154
void handle_sigchld(__attribute__((unused)) int sig){
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
}
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;
253
171
}
254
172
255
/* Prints out a password to stdout */
256
173
bool print_out_password(const char *buffer, size_t length){
257
174
ssize_t ret;
258
175
if(length>0 and buffer[length-1] == '\n'){
268
185
return true;
269
186
}
270
187
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
305
}
306
307
188
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
311
190
size_t d_name_len;
312
191
DIR *dir = NULL;
313
192
struct dirent *dirst;
321
200
struct sigaction old_sigchld_action;
322
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
323
202
.sa_flags = SA_NOCLDSTOP };
324
char **custom_argv = NULL;
325
int custom_argc = 0;
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
206
errno = 0;
326
207
327
208
/* Establish a signal handler */
328
209
sigemptyset(&sigchld_action.sa_mask);
329
210
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
if(ret == -1){
211
if(ret < 0){
331
212
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
213
exit(EXIT_FAILURE);
334
214
}
335
215
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
if(ret == -1){
216
if(ret < 0){
337
217
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
218
exit(EXIT_FAILURE);
340
219
}
341
220
342
221
/* The options we understand. */
344
223
{ .name = "global-options", .key = 'g',
345
224
.arg = "OPTION[,OPTION[,...]]",
346
225
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'G',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
350
226
{ .name = "options-for", .key = 'o',
351
227
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
228
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'E',
354
.arg = "PLUGIN:ENV=value",
355
.doc = "Environment variable passed to specified plugin" },
356
229
{ .name = "disable", .key = 'd',
357
230
.arg = "PLUGIN",
358
231
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
362
232
{ .name = "plugin-dir", .key = 128,
363
233
.arg = "DIRECTORY",
364
234
.doc = "Specify a different plugin directory", .group = 2 },
365
{ .name = "config-file", .key = 129,
366
.arg = "FILE",
367
.doc = "Specify a different configuration file", .group = 2 },
368
{ .name = "userid", .key = 130,
369
.arg = "ID", .flags = 0,
370
.doc = "User ID the plugins will run as", .group = 3 },
371
{ .name = "groupid", .key = 131,
372
.arg = "ID", .flags = 0,
373
.doc = "Group ID the plugins will run as", .group = 3 },
374
{ .name = "debug", .key = 132,
375
.doc = "Debug mode", .group = 4 },
235
{ .name = "userid", .key = 129,
236
.arg = "ID", .flags = 0,
237
.doc = "User ID the plugins will run as", .group = 2 },
238
{ .name = "groupid", .key = 130,
239
.arg = "ID", .flags = 0,
240
.doc = "Group ID the plugins will run as", .group = 2 },
241
{ .name = "debug", .key = 131,
242
.doc = "Debug mode", .group = 3 },
376
243
{ .name = NULL }
377
244
};
378
245
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
246
error_t parse_opt (int key, char *arg, struct argp_state *state) {
247
/* Get the INPUT argument from `argp_parse', which we know is a
248
pointer to our plugin list pointer. */
249
plugin **plugins = state->input;
381
250
switch (key) {
382
case 'g': /* --global-options */
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
393
}
394
}
395
break;
396
case 'G': /* --global-env */
397
if(arg == NULL){
398
break;
399
}
400
{
401
char *envdef = strdup(arg);
402
if(envdef == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
407
}
408
}
409
break;
410
case 'o': /* --options-for */
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0' or arg == NULL){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0' or opt == NULL){
418
break;
419
}
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
429
}
430
}
431
break;
432
case 'E': /* --env-for */
433
if(arg == NULL){
434
break;
435
}
436
{
437
char *envdef = strchr(arg, ':');
438
if(envdef == NULL){
439
break;
440
}
441
char *p_name = strndup(arg, (size_t) (envdef-arg));
442
if(p_name == NULL){
443
break;
444
}
445
envdef++;
446
if(not add_environment(getplugin(p_name), envdef, true)){
447
perror("add_environment");
448
}
449
}
450
break;
451
case 'd': /* --disable */
452
if (arg != NULL){
453
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
456
}
457
p->disabled = true;
458
}
459
break;
460
case 'e': /* --enable */
461
if (arg != NULL){
462
plugin *p = getplugin(arg);
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
465
}
466
p->disabled = false;
467
}
468
break;
469
case 128: /* --plugin-dir */
470
plugindir = strdup(arg);
471
if(plugindir == NULL){
472
perror("strdup");
473
}
474
break;
475
case 129: /* --config-file */
476
/* This is already done by parse_opt_config_file() */
477
break;
478
case 130: /* --userid */
251
case 'g':
252
if (arg != NULL){
253
char *p = strtok(arg, ",");
254
do{
255
addargument(getplugin(NULL, plugins), p);
256
p = strtok(NULL, ",");
257
} while (p != NULL);
258
}
259
break;
260
case 'o':
261
if (arg != NULL){
262
char *name = strtok(arg, ":");
263
char *p = strtok(NULL, ":");
264
if(p != NULL){
265
p = strtok(p, ",");
266
do{
267
addargument(getplugin(name, plugins), p);
268
p = strtok(NULL, ",");
269
} while (p != NULL);
270
}
271
}
272
break;
273
case 'd':
274
if (arg != NULL){
275
getplugin(arg, plugins)->disabled = true;
276
}
277
break;
278
case 128:
279
plugindir = arg;
280
break;
281
case 129:
479
282
uid = (uid_t)strtol(arg, NULL, 10);
480
283
break;
481
case 131: /* --groupid */
284
case 130:
482
285
gid = (gid_t)strtol(arg, NULL, 10);
483
286
break;
484
case 132: /* --debug */
287
case 131:
485
288
debug = true;
486
289
break;
487
290
case ARGP_KEY_ARG:
488
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
489
break;
490
case ARGP_KEY_END:
491
break;
492
default:
493
return ARGP_ERR_UNKNOWN;
494
}
495
return 0;
496
}
497
498
/* This option parser is the same as parse_opt() above, except it
499
ignores everything but the --config-file option. */
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
504
case 'g': /* --global-options */
505
case 'G': /* --global-env */
506
case 'o': /* --options-for */
507
case 'E': /* --env-for */
508
case 'd': /* --disable */
509
case 'e': /* --enable */
510
case 128: /* --plugin-dir */
511
break;
512
case 129: /* --config-file */
513
argfile = strdup(arg);
514
if(argfile == NULL){
515
perror("strdup");
291
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
292
argp_usage (state);
516
293
}
517
break;
518
case 130: /* --userid */
519
case 131: /* --groupid */
520
case 132: /* --debug */
521
case ARGP_KEY_ARG:
294
plus_options = arg;
295
break;
522
296
case ARGP_KEY_END:
523
297
break;
524
298
default:
527
301
return 0;
528
302
}
529
303
530
struct argp argp = { .options = options,
531
.parser = parse_opt_config_file,
532
.args_doc = "",
304
plugin *plugin_list = NULL;
305
306
struct argp argp = { .options = options, .parser = parse_opt,
307
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
533
308
.doc = "Mandos plugin runner -- Run plugins" };
534
309
535
/* Parse using the parse_opt_config_file in order to get the custom
536
config file location, if any. */
537
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
310
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
538
311
if (ret == ARGP_ERR_UNKNOWN){
539
312
fprintf(stderr, "Unknown error while parsing arguments\n");
540
313
exitstatus = EXIT_FAILURE;
541
goto fallback;
314
goto end;
542
315
}
543
316
544
/* Reset to the normal argument parser */
545
argp.parser = parse_opt;
546
547
/* Open the configfile if available */
548
if (argfile == NULL){
549
conffp = fopen(AFILE, "r");
550
} else {
551
conffp = fopen(argfile, "r");
552
}
553
if(conffp != NULL){
554
char *org_line = NULL;
555
char *p, *arg, *new_arg, *line;
556
size_t size = 0;
557
ssize_t sret;
558
const char whitespace_delims[] = " \r\t\f\v\n";
559
const char comment_delim[] = "#";
560
561
custom_argc = 1;
562
custom_argv = malloc(sizeof(char*) * 2);
563
if(custom_argv == NULL){
317
if(plus_options){
318
/* This is a mangled argument in the form of
319
"+--option+--other-option=parameter+--yet-another-option", etc */
320
/* Make new argc and argv vars, and call argp_parse() again. */
321
plus_options++; /* skip the first '+' character */
322
const char delims[] = "+";
323
char *arg;
324
int new_argc = 1;
325
plus_argv = malloc(sizeof(char*) * 2);
326
if(plus_argv == NULL){
564
327
perror("malloc");
565
328
exitstatus = EXIT_FAILURE;
566
goto fallback;
567
}
568
custom_argv[0] = argv[0];
569
custom_argv[1] = NULL;
570
571
/* for each line in the config file, strip whitespace and ignore
572
commented text */
573
while(true){
574
sret = getline(&org_line, &size, conffp);
575
if(sret == -1){
576
break;
577
}
578
579
line = org_line;
580
arg = strsep(&line, comment_delim);
581
while((p = strsep(&arg, whitespace_delims)) != NULL){
582
if(p[0] == '\0'){
583
continue;
584
}
585
new_arg = strdup(p);
586
if(new_arg == NULL){
587
perror("strdup");
588
exitstatus = EXIT_FAILURE;
589
free(org_line);
590
goto fallback;
591
}
592
593
custom_argc += 1;
594
custom_argv = realloc(custom_argv, sizeof(char *)
595
* ((unsigned int) custom_argc + 1));
596
if(custom_argv == NULL){
597
perror("realloc");
598
exitstatus = EXIT_FAILURE;
599
free(org_line);
600
goto fallback;
601
}
602
custom_argv[custom_argc-1] = new_arg;
603
custom_argv[custom_argc] = NULL;
604
}
605
}
606
free(org_line);
607
} else {
608
/* Check for harmful errors and go to fallback. Other errors might
609
not affect opening plugins */
610
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
611
perror("fopen");
612
exitstatus = EXIT_FAILURE;
613
goto fallback;
614
}
615
}
616
/* If there was any arguments from configuration file,
617
pass them to parser as command arguments */
618
if(custom_argv != NULL){
619
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
620
0, NULL);
329
goto end;
330
}
331
plus_argv[0] = argv[0];
332
plus_argv[1] = NULL;
333
arg = strtok(plus_options, delims); /* Get first argument */
334
while(arg != NULL){
335
new_argc++;
336
plus_argv = realloc(plus_argv, sizeof(char *)
337
* ((unsigned int) new_argc + 1));
338
if(plus_argv == NULL){
339
perror("realloc");
340
exitstatus = EXIT_FAILURE;
341
goto end;
342
}
343
plus_argv[new_argc-1] = arg;
344
plus_argv[new_argc] = NULL;
345
arg = strtok(NULL, delims); /* Get next argument */
346
}
347
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
621
348
if (ret == ARGP_ERR_UNKNOWN){
622
349
fprintf(stderr, "Unknown error while parsing arguments\n");
623
350
exitstatus = EXIT_FAILURE;
624
goto fallback;
351
goto end;
625
352
}
626
353
}
627
354
628
/* Parse actual command line arguments, to let them override the
629
config file */
630
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
631
if (ret == ARGP_ERR_UNKNOWN){
632
fprintf(stderr, "Unknown error while parsing arguments\n");
633
exitstatus = EXIT_FAILURE;
634
goto fallback;
635
}
636
637
355
if(debug){
638
356
for(plugin *p = plugin_list; p != NULL; p=p->next){
639
357
fprintf(stderr, "Plugin: %s has %d arguments\n",
641
359
for(char **a = p->argv; *a != NULL; a++){
642
360
fprintf(stderr, "\tArg: %s\n", *a);
643
361
}
644
fprintf(stderr, "...and %u environment variables\n", p->envc);
645
for(char **a = p->environ; *a != NULL; a++){
646
fprintf(stderr, "\t%s\n", *a);
647
}
648
362
}
649
363
}
650
364
651
/* Strip permissions down to nobody */
652
365
ret = setuid(uid);
653
366
if (ret == -1){
654
367
perror("setuid");
655
}
368
}
369
656
370
setgid(gid);
657
371
if (ret == -1){
658
372
perror("setgid");
659
373
}
660
374
661
if (plugindir == NULL){
662
dir = opendir(PDIR);
663
} else {
664
dir = opendir(plugindir);
665
}
666
375
dir = opendir(plugindir);
667
376
if(dir == NULL){
668
377
perror("Could not open plugin dir");
669
378
exitstatus = EXIT_FAILURE;
670
goto fallback;
379
goto end;
671
380
}
672
381
673
382
/* Set the FD_CLOEXEC flag on the directory, if possible */
678
387
if(ret < 0){
679
388
perror("set_cloexec_flag");
680
389
exitstatus = EXIT_FAILURE;
681
goto fallback;
390
goto end;
682
391
}
683
392
}
684
393
}
685
394
686
395
FD_ZERO(&rfds_all);
687
396
688
/* Read and execute any executable in the plugin directory*/
689
397
while(true){
690
398
dirst = readdir(dir);
691
399
692
/* All directory entries have been processed */
400
// All directory entries have been processed
693
401
if(dirst == NULL){
694
402
if (errno == EBADF){
695
403
perror("readdir");
696
404
exitstatus = EXIT_FAILURE;
697
goto fallback;
405
goto end;
698
406
}
699
407
break;
700
408
}
701
409
702
410
d_name_len = strlen(dirst->d_name);
703
411
704
/* Ignore dotfiles, backup files and other junk */
412
// Ignore dotfiles, backup files and other junk
705
413
{
706
414
bool bad_name = false;
707
415
722
430
break;
723
431
}
724
432
}
433
725
434
if(bad_name){
726
435
continue;
727
436
}
437
728
438
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
729
439
size_t suf_len = strlen(*suf);
730
440
if((d_name_len >= suf_len)
743
453
continue;
744
454
}
745
455
}
746
747
char *filename;
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
if(ret < 0){
750
perror("asprintf");
456
457
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
458
if (filename == NULL){
459
perror("malloc");
751
460
continue;
752
461
}
462
strcpy(filename, plugindir); /* Spurious warning */
463
strcat(filename, "/"); /* Spurious warning */
464
strcat(filename, dirst->d_name); /* Spurious warning */
753
465
754
466
ret = stat(filename, &st);
755
467
if (ret == -1){
757
469
free(filename);
758
470
continue;
759
471
}
760
761
/* Ignore non-executable files */
472
762
473
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
763
474
if(debug){
764
475
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
478
free(filename);
768
479
continue;
769
480
}
770
771
plugin *p = getplugin(dirst->d_name);
772
if(p == NULL){
773
perror("getplugin");
774
free(filename);
775
continue;
776
}
777
if(p->disabled){
481
if(getplugin(dirst->d_name, &plugin_list)->disabled){
778
482
if(debug){
779
483
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
780
484
dirst->d_name);
782
486
free(filename);
783
487
continue;
784
488
}
489
plugin *p = getplugin(dirst->d_name, &plugin_list);
785
490
{
786
491
/* Add global arguments to argument list for this plugin */
787
plugin *g = getplugin(NULL);
788
if(g != NULL){
789
for(char **a = g->argv + 1; *a != NULL; a++){
790
if(not add_argument(p, *a)){
791
perror("add_argument");
792
}
793
}
794
/* Add global environment variables */
795
for(char **e = g->environ; *e != NULL; e++){
796
if(not add_environment(p, *e, false)){
797
perror("add_environment");
798
}
799
}
800
}
801
}
802
/* If this plugin has any environment variables, we will call
803
using execve and need to duplicate the environment from this
804
process, too. */
805
if(p->environ[0] != NULL){
806
for(char **e = environ; *e != NULL; e++){
807
if(not add_environment(p, *e, false)){
808
perror("add_environment");
809
}
810
}
811
}
812
813
int pipefd[2];
492
plugin *g = getplugin(NULL, &plugin_list);
493
for(char **a = g->argv + 1; *a != NULL; a++){
494
addargument(p, *a);
495
}
496
}
497
int pipefd[2];
814
498
ret = pipe(pipefd);
815
499
if (ret == -1){
816
500
perror("pipe");
817
501
exitstatus = EXIT_FAILURE;
818
goto fallback;
502
goto end;
819
503
}
820
/* Ask OS to automatic close the pipe on exec */
821
504
ret = set_cloexec_flag(pipefd[0]);
822
505
if(ret < 0){
823
506
perror("set_cloexec_flag");
824
507
exitstatus = EXIT_FAILURE;
825
goto fallback;
508
goto end;
826
509
}
827
510
ret = set_cloexec_flag(pipefd[1]);
828
511
if(ret < 0){
829
512
perror("set_cloexec_flag");
830
513
exitstatus = EXIT_FAILURE;
831
goto fallback;
514
goto end;
832
515
}
833
516
/* Block SIGCHLD until process is safely in process list */
834
517
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
835
518
if(ret < 0){
836
519
perror("sigprocmask");
837
520
exitstatus = EXIT_FAILURE;
838
goto fallback;
521
goto end;
839
522
}
840
/* Starting a new process to be watched */
523
// Starting a new process to be watched
841
524
pid_t pid = fork();
842
525
if(pid == -1){
843
526
perror("fork");
844
527
exitstatus = EXIT_FAILURE;
845
goto fallback;
528
goto end;
846
529
}
847
530
if(pid == 0){
848
531
/* this is the child process */
868
551
above and must now close it manually here. */
869
552
closedir(dir);
870
553
}
871
if(p->environ[0] == NULL){
872
if(execv(filename, p->argv) < 0){
873
perror("execv");
874
_exit(EXIT_FAILURE);
875
}
876
} else {
877
if(execve(filename, p->argv, p->environ) < 0){
878
perror("execve");
879
_exit(EXIT_FAILURE);
880
}
554
if(execv(filename, p->argv) < 0){
555
perror("execv");
556
_exit(EXIT_FAILURE);
881
557
}
882
558
/* no return */
883
559
}
884
/* Parent process */
885
close(pipefd[1]); /* Close unused write end of pipe */
560
/* parent process */
886
561
free(filename);
887
plugin *new_plugin = getplugin(dirst->d_name);
888
if (new_plugin == NULL){
889
perror("getplugin");
562
close(pipefd[1]); /* close unused write end of pipe */
563
process *new_process = malloc(sizeof(process));
564
if (new_process == NULL){
565
perror("malloc");
890
566
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
891
567
if(ret < 0){
892
perror("sigprocmask");
568
perror("sigprocmask");
893
569
}
894
570
exitstatus = EXIT_FAILURE;
895
goto fallback;
571
goto end;
896
572
}
897
573
898
new_plugin->pid = pid;
899
new_plugin->fd = pipefd[0];
900
574
*new_process = (struct process){ .pid = pid,
575
.fd = pipefd[0],
576
.next = process_list };
577
// List handling
578
process_list = new_process;
901
579
/* Unblock SIGCHLD so signal handler can be run if this process
902
580
has already completed */
903
581
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
582
if(ret < 0){
905
583
perror("sigprocmask");
906
584
exitstatus = EXIT_FAILURE;
907
goto fallback;
908
}
909
910
FD_SET(new_plugin->fd, &rfds_all);
911
912
if (maxfd < new_plugin->fd){
913
maxfd = new_plugin->fd;
914
}
915
585
goto end;
586
}
587
588
FD_SET(new_process->fd, &rfds_all);
589
590
if (maxfd < new_process->fd){
591
maxfd = new_process->fd;
592
}
593
594
}
595
596
/* Free the plugin list */
597
for(plugin *next; plugin_list != NULL; plugin_list = next){
598
next = plugin_list->next;
599
free(plugin_list->argv);
600
free(plugin_list);
916
601
}
917
602
918
603
closedir(dir);
919
604
dir = NULL;
920
921
for(plugin *p = plugin_list; p != NULL; p = p->next){
922
if(p->pid != 0){
923
break;
924
}
925
if(p->next == NULL){
926
fprintf(stderr, "No plugin processes started. Incorrect plugin"
927
" directory?\n");
928
free_plugin_list();
929
}
605
606
if (process_list == NULL){
607
fprintf(stderr, "No plugin processes started. Incorrect plugin"
608
" directory?\n");
609
process_list = NULL;
930
610
}
931
932
/* Main loop while running plugins exist */
933
while(plugin_list){
611
while(process_list){
934
612
fd_set rfds = rfds_all;
935
613
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
936
614
if (select_ret == -1){
937
615
perror("select");
938
616
exitstatus = EXIT_FAILURE;
939
goto fallback;
617
goto end;
940
618
}
941
619
/* OK, now either a process completed, or something can be read
942
620
from one of them */
943
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
621
for(process *proc = process_list; proc ; proc = proc->next){
944
622
/* Is this process completely done? */
945
623
if(proc->eof and proc->completed){
946
624
/* Only accept the plugin output if it exited cleanly */
947
625
if(not WIFEXITED(proc->status)
948
626
or WEXITSTATUS(proc->status) != 0){
949
627
/* Bad exit by plugin */
950
951
628
if(debug){
952
629
if(WIFEXITED(proc->status)){
953
630
fprintf(stderr, "Plugin %u exited with status %d\n",
962
639
(unsigned int) (proc->pid));
963
640
}
964
641
}
965
966
642
/* Remove the plugin */
967
643
FD_CLR(proc->fd, &rfds_all);
968
969
644
/* Block signal while modifying process_list */
970
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
645
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
971
646
if(ret < 0){
972
647
perror("sigprocmask");
973
648
exitstatus = EXIT_FAILURE;
974
goto fallback;
975
}
976
free_plugin(proc);
649
goto end;
650
}
651
/* Delete this process entry from the list */
652
if(process_list == proc){
653
/* First one - simple */
654
process_list = proc->next;
655
} else {
656
/* Second one or later */
657
for(process *p = process_list; p != NULL; p = p->next){
658
if(p->next == proc){
659
p->next = proc->next;
660
break;
661
}
662
}
663
}
977
664
/* We are done modifying process list, so unblock signal */
978
665
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
666
NULL);
980
667
if(ret < 0){
981
668
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
continue;
669
}
670
free(proc->buffer);
671
free(proc);
672
/* We deleted this process from the list, so we can't go
673
proc->next. Therefore, start over from the beginning of
674
the process list */
675
break;
990
676
}
991
992
677
/* This process exited nicely, so print its buffer */
993
678
994
bool bret = print_out_password(proc->buffer,
995
proc->buffer_length);
679
bool bret = print_out_password(proc->buffer, proc->buffer_length);
996
680
if(not bret){
997
681
perror("print_out_password");
998
682
exitstatus = EXIT_FAILURE;
999
683
}
1000
goto fallback;
684
goto end;
1001
685
}
1002
1003
686
/* This process has not completed. Does it have any output? */
1004
687
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1005
688
/* This process had nothing to say at this time */
1012
695
if (proc->buffer == NULL){
1013
696
perror("malloc");
1014
697
exitstatus = EXIT_FAILURE;
1015
goto fallback;
698
goto end;
1016
699
}
1017
700
proc->buffer_size += BUFFER_SIZE;
1018
701
}
1033
716
}
1034
717
1035
718
1036
fallback:
719
end:
1037
720
1038
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1039
/* Fallback if all plugins failed, none are found or an error
1040
occured */
721
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
722
/* Fallback if all plugins failed, none are found or an error occured */
1041
723
bool bret;
1042
724
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1043
725
char *passwordbuffer = getpass("Password: ");
1045
727
if(not bret){
1046
728
perror("print_out_password");
1047
729
exitstatus = EXIT_FAILURE;
730
goto end;
1048
731
}
1049
732
}
1050
733
1051
734
/* Restore old signal handler */
1052
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitstatus = EXIT_FAILURE;
1056
}
1057
1058
if(custom_argv != NULL){
1059
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1060
free(*arg);
1061
}
1062
free(custom_argv);
735
sigaction(SIGCHLD, &old_sigchld_action, NULL);
736
737
free(plus_argv);
738
739
/* Free the plugin list */
740
for(plugin *next; plugin_list != NULL; plugin_list = next){
741
next = plugin_list->next;
742
free(plugin_list->argv);
743
free(plugin_list);
1063
744
}
1064
745
1065
746
if(dir != NULL){
1067
748
}
1068
749
1069
750
/* Free the process list and kill the processes */
1070
for(plugin *p = plugin_list; p != NULL; p = p->next){
1071
if(p->pid != 0){
1072
close(p->fd);
1073
ret = kill(p->pid, SIGTERM);
1074
if(ret == -1 and errno != ESRCH){
1075
/* Set-uid proccesses might not get closed */
1076
perror("kill");
1077
}
751
for(process *next; process_list != NULL; process_list = next){
752
next = process_list->next;
753
close(process_list->fd);
754
ret = kill(process_list->pid, SIGTERM);
755
if(ret == -1 and errno != ESRCH){
756
/* set-uid proccesses migth not get closed */
757
perror("kill");
1078
758
}
759
free(process_list->buffer);
760
free(process_list);
1079
761
}
1080
762
1081
763
/* Wait for any remaining child processes to terminate */
1085
767
if(errno != ECHILD){
1086
768
perror("wait");
1087
769
}
1088
1089
free_plugin_list();
1090
1091
free(plugindir);
1092
free(argfile);
1093
770
1094
771
return exitstatus;
1095
772
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0