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- Committer: Teddy Hogeborn
- Date: 2008-09-07 15:42:11 UTC
- Revision ID: teddy@fukt.bsnet.se-20080907154211-sc90y38lazc4ewfq
* initramfs-tools-script: Fix permissions of "/tmp" in initrd.
* plugin-runner.c (parse_opt): Ignore empty argument strings.
* plugin-runner.c (parse_opt): Ignore empty argument strings.
- 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> /* strsep, 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,
65
65
#include <errno.h> /* errno, EBADF */
66
66
67
67
#define BUFFER_SIZE 256
68
#define CONFFILE "/conf/conf.d/mandos/client.conf"
69
70
const char *argp_program_version = "mandos-client 1.0";
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";
71
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
74
73
struct process;
74
75
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*/
76
86
pid_t pid;
77
87
int fd;
78
88
char *buffer;
79
89
size_t buffer_size;
80
90
size_t buffer_length;
81
91
bool eof;
82
bool completed;
83
int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
bool disabled;
92
volatile bool completed;
93
volatile int status;
92
94
struct plugin *next;
93
95
} plugin;
94
96
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
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){
97
104
if ((p->name == name)
98
105
or (p->name and name and (strcmp(p->name, name) == 0))){
99
106
return p;
102
109
/* Create a new plugin */
103
110
plugin *new_plugin = malloc(sizeof(plugin));
104
111
if (new_plugin == NULL){
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
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
109
127
new_plugin->argv = malloc(sizeof(char *) * 2);
110
128
if (new_plugin->argv == NULL){
111
perror("malloc");
112
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
113
132
}
114
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
115
134
new_plugin->argv[1] = NULL;
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
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
119
145
/* Append the new plugin to the list */
120
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
121
147
return new_plugin;
122
148
}
123
149
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
128
perror("malloc");
129
exit(EXIT_FAILURE);
130
}
131
p->argc++;
132
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));
133
204
}
134
205
135
206
/*
148
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
149
220
}
150
221
151
process *process_list = NULL;
152
222
153
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
154
224
status. */
155
225
void handle_sigchld(__attribute__((unused)) int sig){
156
process *proc = process_list;
157
int status;
158
pid_t pid = wait(&status);
159
if(pid == -1){
160
perror("wait");
161
return;
162
}
163
while(proc != NULL and proc->pid != pid){
164
proc = proc->next;
165
}
166
if(proc == NULL){
167
/* Process not found in process list */
168
return;
169
}
170
proc->status = status;
171
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
}
172
253
}
173
254
255
/* Prints out a password to stdout */
174
256
bool print_out_password(const char *buffer, size_t length){
175
257
ssize_t ret;
176
if(length>0 and buffer[length-1] == '\n'){
177
length--;
178
}
179
258
for(size_t written = 0; written < length; written += (size_t)ret){
180
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
181
260
length - written));
186
265
return true;
187
266
}
188
267
189
char ** addcustomargument(char **argv, int *argc, char *arg){
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);
190
280
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
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
}
196
292
}
197
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
198
argv[1] = NULL;
199
}
200
*argc += 1;
201
argv = realloc(argv, sizeof(char *)
202
* ((unsigned int) *argc + 1));
203
if(argv == NULL){
204
return NULL;
205
}
206
argv[*argc-1] = arg;
207
argv[*argc] = NULL;
208
return argv;
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
}
209
302
}
210
303
211
304
int main(int argc, char *argv[]){
212
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
213
const char *conffile = CONFFILE;
305
char *plugindir = NULL;
306
char *argfile = NULL;
214
307
FILE *conffp;
215
308
size_t d_name_len;
216
309
DIR *dir = NULL;
231
324
/* Establish a signal handler */
232
325
sigemptyset(&sigchld_action.sa_mask);
233
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
234
if(ret < 0){
327
if(ret == -1){
235
328
perror("sigaddset");
236
exit(EXIT_FAILURE);
329
exitstatus = EXIT_FAILURE;
330
goto fallback;
237
331
}
238
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
239
if(ret < 0){
333
if(ret == -1){
240
334
perror("sigaction");
241
exit(EXIT_FAILURE);
335
exitstatus = EXIT_FAILURE;
336
goto fallback;
242
337
}
243
338
244
339
/* The options we understand. */
246
341
{ .name = "global-options", .key = 'g',
247
342
.arg = "OPTION[,OPTION[,...]]",
248
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" },
249
347
{ .name = "options-for", .key = 'o',
250
348
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
251
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" },
252
353
{ .name = "disable", .key = 'd',
253
354
.arg = "PLUGIN",
254
355
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
255
359
{ .name = "plugin-dir", .key = 128,
256
360
.arg = "DIRECTORY",
257
361
.doc = "Specify a different plugin directory", .group = 2 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.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 },
266
373
{ .name = NULL }
267
374
};
268
375
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
273
378
switch (key) {
274
case 'g':
379
case 'g': /* --global-options */
275
380
if (arg != NULL){
276
381
char *p;
277
382
while((p = strsep(&arg, ",")) != NULL){
278
383
if(p[0] == '\0'){
279
384
continue;
280
385
}
281
addargument(getplugin(NULL, plugins), p);
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
389
}
282
390
}
283
391
}
284
392
break;
285
case 'o':
393
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
399
}
400
break;
401
case 'o': /* --options-for */
286
402
if (arg != NULL){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
289
405
break;
290
406
}
291
407
char *opt = strsep(&arg, ":");
292
if(opt[0] == '\0'){
293
break;
294
}
295
if(opt != NULL){
296
char *p;
297
while((p = strsep(&opt, ",")) != NULL){
298
if(p[0] == '\0'){
299
continue;
300
}
301
addargument(getplugin(name, plugins), p);
302
}
303
}
304
}
305
break;
306
case 'd':
307
if (arg != NULL){
308
getplugin(arg, plugins)->disabled = true;
309
}
310
break;
311
case 128:
312
plugindir = arg;
313
break;
314
case 129:
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
419
}
420
}
421
}
422
break;
423
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
427
{
428
char *envdef = strchr(arg, ':');
429
if(envdef == NULL){
430
break;
431
}
432
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
435
}
436
}
437
break;
438
case 'd': /* --disable */
439
if (arg != NULL){
440
plugin *p = getplugin(arg);
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
443
}
444
p->disabled = true;
445
}
446
break;
447
case 'e': /* --enable */
448
if (arg != NULL){
449
plugin *p = getplugin(arg);
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
452
}
453
p->disabled = false;
454
}
455
break;
456
case 128: /* --plugin-dir */
457
free(plugindir);
458
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
462
break;
463
case 129: /* --config-file */
464
/* This is already done by parse_opt_config_file() */
465
break;
466
case 130: /* --userid */
315
467
uid = (uid_t)strtol(arg, NULL, 10);
316
468
break;
317
case 130:
469
case 131: /* --groupid */
318
470
gid = (gid_t)strtol(arg, NULL, 10);
319
471
break;
320
case 131:
472
case 132: /* --debug */
321
473
debug = true;
322
474
break;
323
475
case ARGP_KEY_ARG:
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
325
break;
326
case ARGP_KEY_END:
327
break;
328
default:
329
return ARGP_ERR_UNKNOWN;
330
}
331
return 0;
332
}
333
334
plugin *plugin_list = NULL;
335
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
476
/* Cryptsetup always passes an argument, which is an empty
477
string if "none" was specified in /etc/crypttab. So if
478
argument was empty, we ignore it silently. */
479
if(arg[0] != '\0'){
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
481
}
482
break;
483
case ARGP_KEY_END:
484
break;
485
default:
486
return ARGP_ERR_UNKNOWN;
487
}
488
return 0;
489
}
490
491
/* This option parser is the same as parse_opt() above, except it
492
ignores everything but the --config-file option. */
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
496
switch (key) {
497
case 'g': /* --global-options */
498
case 'G': /* --global-env */
499
case 'o': /* --options-for */
500
case 'E': /* --env-for */
501
case 'd': /* --disable */
502
case 'e': /* --enable */
503
case 128: /* --plugin-dir */
504
break;
505
case 129: /* --config-file */
506
free(argfile);
507
argfile = strdup(arg);
508
if(argfile == NULL){
509
perror("strdup");
510
}
511
break;
512
case 130: /* --userid */
513
case 131: /* --groupid */
514
case 132: /* --debug */
515
case ARGP_KEY_ARG:
516
case ARGP_KEY_END:
517
break;
518
default:
519
return ARGP_ERR_UNKNOWN;
520
}
521
return 0;
522
}
523
524
struct argp argp = { .options = options,
525
.parser = parse_opt_config_file,
526
.args_doc = "",
338
527
.doc = "Mandos plugin runner -- Run plugins" };
339
528
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
529
/* Parse using the parse_opt_config_file in order to get the custom
530
config file location, if any. */
531
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
341
532
if (ret == ARGP_ERR_UNKNOWN){
342
533
fprintf(stderr, "Unknown error while parsing arguments\n");
343
534
exitstatus = EXIT_FAILURE;
344
goto end;
535
goto fallback;
345
536
}
346
347
conffp = fopen(conffile, "r");
537
538
/* Reset to the normal argument parser */
539
argp.parser = parse_opt;
540
541
/* Open the configfile if available */
542
if (argfile == NULL){
543
conffp = fopen(AFILE, "r");
544
} else {
545
conffp = fopen(argfile, "r");
546
}
348
547
if(conffp != NULL){
349
548
char *org_line = NULL;
549
char *p, *arg, *new_arg, *line;
350
550
size_t size = 0;
351
551
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
353
552
const char whitespace_delims[] = " \r\t\f\v\n";
354
553
const char comment_delim[] = "#";
355
554
555
custom_argc = 1;
556
custom_argv = malloc(sizeof(char*) * 2);
557
if(custom_argv == NULL){
558
perror("malloc");
559
exitstatus = EXIT_FAILURE;
560
goto fallback;
561
}
562
custom_argv[0] = argv[0];
563
custom_argv[1] = NULL;
564
565
/* for each line in the config file, strip whitespace and ignore
566
commented text */
356
567
while(true){
357
568
sret = getline(&org_line, &size, conffp);
358
569
if(sret == -1){
366
577
continue;
367
578
}
368
579
new_arg = strdup(p);
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
580
if(new_arg == NULL){
581
perror("strdup");
582
exitstatus = EXIT_FAILURE;
583
free(org_line);
584
goto fallback;
585
}
586
587
custom_argc += 1;
588
custom_argv = realloc(custom_argv, sizeof(char *)
589
* ((unsigned int) custom_argc + 1));
590
if(custom_argv == NULL){
591
perror("realloc");
592
exitstatus = EXIT_FAILURE;
593
free(org_line);
594
goto fallback;
595
}
596
custom_argv[custom_argc-1] = new_arg;
597
custom_argv[custom_argc] = NULL;
375
598
}
376
599
}
377
600
free(org_line);
378
} else{
379
/* check for harmfull errors */
601
} else {
602
/* Check for harmful errors and go to fallback. Other errors might
603
not affect opening plugins */
380
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
381
605
perror("fopen");
382
606
exitstatus = EXIT_FAILURE;
383
goto end;
607
goto fallback;
384
608
}
385
609
}
386
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
387
612
if(custom_argv != NULL){
388
custom_argv[0] = argv[0];
389
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
390
615
if (ret == ARGP_ERR_UNKNOWN){
391
616
fprintf(stderr, "Unknown error while parsing arguments\n");
392
617
exitstatus = EXIT_FAILURE;
393
goto end;
618
goto fallback;
394
619
}
395
620
}
396
621
622
/* Parse actual command line arguments, to let them override the
623
config file */
624
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
625
if (ret == ARGP_ERR_UNKNOWN){
626
fprintf(stderr, "Unknown error while parsing arguments\n");
627
exitstatus = EXIT_FAILURE;
628
goto fallback;
629
}
630
397
631
if(debug){
398
632
for(plugin *p = plugin_list; p != NULL; p=p->next){
399
633
fprintf(stderr, "Plugin: %s has %d arguments\n",
401
635
for(char **a = p->argv; *a != NULL; a++){
402
636
fprintf(stderr, "\tArg: %s\n", *a);
403
637
}
638
fprintf(stderr, "...and %u environment variables\n", p->envc);
639
for(char **a = p->environ; *a != NULL; a++){
640
fprintf(stderr, "\t%s\n", *a);
641
}
404
642
}
405
643
}
406
644
645
/* Strip permissions down to nobody */
407
646
ret = setuid(uid);
408
647
if (ret == -1){
409
648
perror("setuid");
410
}
411
649
}
412
650
setgid(gid);
413
651
if (ret == -1){
414
652
perror("setgid");
415
653
}
416
654
417
dir = opendir(plugindir);
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
418
661
if(dir == NULL){
419
662
perror("Could not open plugin dir");
420
663
exitstatus = EXIT_FAILURE;
421
goto end;
664
goto fallback;
422
665
}
423
666
424
667
/* Set the FD_CLOEXEC flag on the directory, if possible */
429
672
if(ret < 0){
430
673
perror("set_cloexec_flag");
431
674
exitstatus = EXIT_FAILURE;
432
goto end;
675
goto fallback;
433
676
}
434
677
}
435
678
}
436
679
437
680
FD_ZERO(&rfds_all);
438
681
682
/* Read and execute any executable in the plugin directory*/
439
683
while(true){
440
684
dirst = readdir(dir);
441
685
442
// All directory entries have been processed
686
/* All directory entries have been processed */
443
687
if(dirst == NULL){
444
688
if (errno == EBADF){
445
689
perror("readdir");
446
690
exitstatus = EXIT_FAILURE;
447
goto end;
691
goto fallback;
448
692
}
449
693
break;
450
694
}
451
695
452
696
d_name_len = strlen(dirst->d_name);
453
697
454
// Ignore dotfiles, backup files and other junk
698
/* Ignore dotfiles, backup files and other junk */
455
699
{
456
700
bool bad_name = false;
457
701
472
716
break;
473
717
}
474
718
}
475
476
719
if(bad_name){
477
720
continue;
478
721
}
479
480
722
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
481
723
size_t suf_len = strlen(*suf);
482
724
if((d_name_len >= suf_len)
495
737
continue;
496
738
}
497
739
}
498
499
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
500
if (filename == NULL){
501
perror("malloc");
740
741
char *filename;
742
if(plugindir == NULL){
743
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
744
} else {
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
}
747
if(ret < 0){
748
perror("asprintf");
502
749
continue;
503
750
}
504
strcpy(filename, plugindir); /* Spurious warning */
505
strcat(filename, "/"); /* Spurious warning */
506
strcat(filename, dirst->d_name); /* Spurious warning */
507
751
508
752
ret = stat(filename, &st);
509
753
if (ret == -1){
511
755
free(filename);
512
756
continue;
513
757
}
514
758
759
/* Ignore non-executable files */
515
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
516
761
if(debug){
517
762
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
520
765
free(filename);
521
766
continue;
522
767
}
523
if(getplugin(dirst->d_name, &plugin_list)->disabled){
768
769
plugin *p = getplugin(dirst->d_name);
770
if(p == NULL){
771
perror("getplugin");
772
free(filename);
773
continue;
774
}
775
if(p->disabled){
524
776
if(debug){
525
777
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
526
778
dirst->d_name);
528
780
free(filename);
529
781
continue;
530
782
}
531
plugin *p = getplugin(dirst->d_name, &plugin_list);
532
783
{
533
784
/* Add global arguments to argument list for this plugin */
534
plugin *g = getplugin(NULL, &plugin_list);
535
for(char **a = g->argv + 1; *a != NULL; a++){
536
addargument(p, *a);
537
}
538
}
539
int pipefd[2];
785
plugin *g = getplugin(NULL);
786
if(g != NULL){
787
for(char **a = g->argv + 1; *a != NULL; a++){
788
if(not add_argument(p, *a)){
789
perror("add_argument");
790
}
791
}
792
/* Add global environment variables */
793
for(char **e = g->environ; *e != NULL; e++){
794
if(not add_environment(p, *e, false)){
795
perror("add_environment");
796
}
797
}
798
}
799
}
800
/* If this plugin has any environment variables, we will call
801
using execve and need to duplicate the environment from this
802
process, too. */
803
if(p->environ[0] != NULL){
804
for(char **e = environ; *e != NULL; e++){
805
if(not add_environment(p, *e, false)){
806
perror("add_environment");
807
}
808
}
809
}
810
811
int pipefd[2];
540
812
ret = pipe(pipefd);
541
813
if (ret == -1){
542
814
perror("pipe");
543
815
exitstatus = EXIT_FAILURE;
544
goto end;
816
goto fallback;
545
817
}
818
/* Ask OS to automatic close the pipe on exec */
546
819
ret = set_cloexec_flag(pipefd[0]);
547
820
if(ret < 0){
548
821
perror("set_cloexec_flag");
549
822
exitstatus = EXIT_FAILURE;
550
goto end;
823
goto fallback;
551
824
}
552
825
ret = set_cloexec_flag(pipefd[1]);
553
826
if(ret < 0){
554
827
perror("set_cloexec_flag");
555
828
exitstatus = EXIT_FAILURE;
556
goto end;
829
goto fallback;
557
830
}
558
831
/* Block SIGCHLD until process is safely in process list */
559
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
560
833
if(ret < 0){
561
834
perror("sigprocmask");
562
835
exitstatus = EXIT_FAILURE;
563
goto end;
836
goto fallback;
564
837
}
565
// Starting a new process to be watched
838
/* Starting a new process to be watched */
566
839
pid_t pid = fork();
567
840
if(pid == -1){
568
841
perror("fork");
569
842
exitstatus = EXIT_FAILURE;
570
goto end;
843
goto fallback;
571
844
}
572
845
if(pid == 0){
573
846
/* this is the child process */
593
866
above and must now close it manually here. */
594
867
closedir(dir);
595
868
}
596
if(execv(filename, p->argv) < 0){
597
perror("execv");
598
_exit(EXIT_FAILURE);
869
if(p->environ[0] == NULL){
870
if(execv(filename, p->argv) < 0){
871
perror("execv");
872
_exit(EXIT_FAILURE);
873
}
874
} else {
875
if(execve(filename, p->argv, p->environ) < 0){
876
perror("execve");
877
_exit(EXIT_FAILURE);
878
}
599
879
}
600
880
/* no return */
601
881
}
602
/* parent process */
882
/* Parent process */
883
close(pipefd[1]); /* Close unused write end of pipe */
603
884
free(filename);
604
close(pipefd[1]); /* close unused write end of pipe */
605
process *new_process = malloc(sizeof(process));
606
if (new_process == NULL){
607
perror("malloc");
885
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
887
perror("getplugin");
608
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
609
889
if(ret < 0){
610
perror("sigprocmask");
890
perror("sigprocmask");
611
891
}
612
892
exitstatus = EXIT_FAILURE;
613
goto end;
893
goto fallback;
614
894
}
615
895
616
*new_process = (struct process){ .pid = pid,
617
.fd = pipefd[0],
618
.next = process_list };
619
// List handling
620
process_list = new_process;
896
new_plugin->pid = pid;
897
new_plugin->fd = pipefd[0];
898
621
899
/* Unblock SIGCHLD so signal handler can be run if this process
622
900
has already completed */
623
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
624
902
if(ret < 0){
625
903
perror("sigprocmask");
626
904
exitstatus = EXIT_FAILURE;
627
goto end;
628
}
629
630
FD_SET(new_process->fd, &rfds_all);
631
632
if (maxfd < new_process->fd){
633
maxfd = new_process->fd;
634
}
635
636
}
637
638
/* Free the plugin list */
639
for(plugin *next; plugin_list != NULL; plugin_list = next){
640
next = plugin_list->next;
641
free(plugin_list->argv);
642
free(plugin_list);
905
goto fallback;
906
}
907
908
FD_SET(new_plugin->fd, &rfds_all);
909
910
if (maxfd < new_plugin->fd){
911
maxfd = new_plugin->fd;
912
}
913
643
914
}
644
915
645
916
closedir(dir);
646
917
dir = NULL;
647
648
if (process_list == NULL){
649
fprintf(stderr, "No plugin processes started. Incorrect plugin"
650
" directory?\n");
651
process_list = NULL;
918
919
for(plugin *p = plugin_list; p != NULL; p = p->next){
920
if(p->pid != 0){
921
break;
922
}
923
if(p->next == NULL){
924
fprintf(stderr, "No plugin processes started. Incorrect plugin"
925
" directory?\n");
926
free_plugin_list();
927
}
652
928
}
653
while(process_list){
929
930
/* Main loop while running plugins exist */
931
while(plugin_list){
654
932
fd_set rfds = rfds_all;
655
933
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
656
934
if (select_ret == -1){
657
935
perror("select");
658
936
exitstatus = EXIT_FAILURE;
659
goto end;
937
goto fallback;
660
938
}
661
939
/* OK, now either a process completed, or something can be read
662
940
from one of them */
663
for(process *proc = process_list; proc ; proc = proc->next){
941
for(plugin *proc = plugin_list; proc != NULL;){
664
942
/* Is this process completely done? */
665
943
if(proc->eof and proc->completed){
666
944
/* Only accept the plugin output if it exited cleanly */
667
945
if(not WIFEXITED(proc->status)
668
946
or WEXITSTATUS(proc->status) != 0){
669
947
/* Bad exit by plugin */
948
670
949
if(debug){
671
950
if(WIFEXITED(proc->status)){
672
951
fprintf(stderr, "Plugin %u exited with status %d\n",
681
960
(unsigned int) (proc->pid));
682
961
}
683
962
}
963
684
964
/* Remove the plugin */
685
965
FD_CLR(proc->fd, &rfds_all);
966
686
967
/* Block signal while modifying process_list */
687
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
688
969
if(ret < 0){
689
970
perror("sigprocmask");
690
971
exitstatus = EXIT_FAILURE;
691
goto end;
692
}
693
/* Delete this process entry from the list */
694
if(process_list == proc){
695
/* First one - simple */
696
process_list = proc->next;
697
} else {
698
/* Second one or later */
699
for(process *p = process_list; p != NULL; p = p->next){
700
if(p->next == proc){
701
p->next = proc->next;
702
break;
703
}
704
}
705
}
972
goto fallback;
973
}
974
706
975
/* We are done modifying process list, so unblock signal */
707
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
708
977
NULL);
709
978
if(ret < 0){
710
979
perror("sigprocmask");
711
}
712
free(proc->buffer);
713
free(proc);
714
/* We deleted this process from the list, so we can't go
715
proc->next. Therefore, start over from the beginning of
716
the process list */
717
break;
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
986
}
987
988
plugin *next_plugin = proc->next;
989
free_plugin(proc);
990
proc = next_plugin;
991
continue;
718
992
}
993
719
994
/* This process exited nicely, so print its buffer */
720
995
721
bool bret = print_out_password(proc->buffer, proc->buffer_length);
996
bool bret = print_out_password(proc->buffer,
997
proc->buffer_length);
722
998
if(not bret){
723
999
perror("print_out_password");
724
1000
exitstatus = EXIT_FAILURE;
725
1001
}
726
goto end;
1002
goto fallback;
727
1003
}
1004
728
1005
/* This process has not completed. Does it have any output? */
729
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
730
1007
/* This process had nothing to say at this time */
1008
proc = proc->next;
731
1009
continue;
732
1010
}
733
1011
/* Before reading, make the process' data buffer large enough */
737
1015
if (proc->buffer == NULL){
738
1016
perror("malloc");
739
1017
exitstatus = EXIT_FAILURE;
740
goto end;
1018
goto fallback;
741
1019
}
742
1020
proc->buffer_size += BUFFER_SIZE;
743
1021
}
746
1024
BUFFER_SIZE);
747
1025
if(ret < 0){
748
1026
/* Read error from this process; ignore the error */
1027
proc = proc->next;
749
1028
continue;
750
1029
}
751
1030
if(ret == 0){
758
1037
}
759
1038
760
1039
761
end:
1040
fallback:
762
1041
763
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
764
/* Fallback if all plugins failed, none are found or an error occured */
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1043
/* Fallback if all plugins failed, none are found or an error
1044
occured */
765
1045
bool bret;
766
1046
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
767
1047
char *passwordbuffer = getpass("Password: ");
768
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1048
size_t len = strlen(passwordbuffer);
1049
/* Strip trailing newline */
1050
if(len > 0 and passwordbuffer[len-1] == '\n'){
1051
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1052
len--;
1053
}
1054
bret = print_out_password(passwordbuffer, len);
769
1055
if(not bret){
770
1056
perror("print_out_password");
771
1057
exitstatus = EXIT_FAILURE;
772
goto end;
773
1058
}
774
1059
}
775
1060
776
1061
/* Restore old signal handler */
777
sigaction(SIGCHLD, &old_sigchld_action, NULL);
778
779
free(custom_argv);
780
781
/* Free the plugin list */
782
for(plugin *next; plugin_list != NULL; plugin_list = next){
783
next = plugin_list->next;
784
free(plugin_list->argv);
785
free(plugin_list);
1062
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1063
if(ret == -1){
1064
perror("sigaction");
1065
exitstatus = EXIT_FAILURE;
1066
}
1067
1068
if(custom_argv != NULL){
1069
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1070
free(*arg);
1071
}
1072
free(custom_argv);
786
1073
}
787
1074
788
1075
if(dir != NULL){
790
1077
}
791
1078
792
1079
/* Free the process list and kill the processes */
793
for(process *next; process_list != NULL; process_list = next){
794
next = process_list->next;
795
close(process_list->fd);
796
ret = kill(process_list->pid, SIGTERM);
797
if(ret == -1 and errno != ESRCH){
798
/* set-uid proccesses migth not get closed */
799
perror("kill");
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
if(p->pid != 0){
1082
close(p->fd);
1083
ret = kill(p->pid, SIGTERM);
1084
if(ret == -1 and errno != ESRCH){
1085
/* Set-uid proccesses might not get closed */
1086
perror("kill");
1087
}
800
1088
}
801
free(process_list->buffer);
802
free(process_list);
803
1089
}
804
1090
805
1091
/* Wait for any remaining child processes to terminate */
809
1095
if(errno != ECHILD){
810
1096
perror("wait");
811
1097
}
1098
1099
free_plugin_list();
1100
1101
free(plugindir);
1102
free(argfile);
812
1103
813
1104
return exitstatus;
814
1105
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0