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- Committer: Björn Påhlsson
- Date: 2008-08-09 20:07:37 UTC
- mfrom: (54 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 56.
- Revision ID: belorn@braxen-20080809200737-nkb9rigetzv0ew60
merge
- files added:
- network-protocol.txt
- files removed:
- .bzrignore
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.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";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
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*/
69
struct process;
70
71
typedef struct process{
86
72
pid_t pid;
87
73
int fd;
88
74
char *buffer;
89
75
size_t buffer_size;
90
76
size_t buffer_length;
91
77
bool eof;
92
volatile bool completed;
93
volatile int status;
78
bool completed;
79
int status;
80
struct process *next;
81
} process;
82
83
typedef struct plugin{
84
char *name; /* can be NULL or any plugin name */
85
char **argv;
86
int argc;
87
bool disabled;
94
88
struct plugin *next;
95
89
} plugin;
96
90
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){
91
static plugin *getplugin(char *name, plugin **plugin_list){
92
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
93
if ((p->name == name)
105
94
or (p->name and name and (strcmp(p->name, name) == 0))){
106
95
return p;
109
98
/* Create a new plugin */
110
99
plugin *new_plugin = malloc(sizeof(plugin));
111
100
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
101
perror("malloc");
102
exit(EXIT_FAILURE);
103
}
104
new_plugin->name = name;
127
105
new_plugin->argv = malloc(sizeof(char *) * 2);
128
106
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
107
perror("malloc");
108
exit(EXIT_FAILURE);
132
109
}
133
new_plugin->argv[0] = copy_name;
110
new_plugin->argv[0] = name;
134
111
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
112
new_plugin->argc = 1;
113
new_plugin->disabled = false;
114
new_plugin->next = *plugin_list;
145
115
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
116
*plugin_list = new_plugin;
147
117
return new_plugin;
148
118
}
149
119
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));
120
static void addargument(plugin *p, char *arg){
121
p->argv[p->argc] = arg;
122
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
123
if (p->argv == NULL){
124
perror("malloc");
125
exit(EXIT_FAILURE);
126
}
127
p->argc++;
128
p->argv[p->argc] = NULL;
204
129
}
205
130
206
131
/*
219
144
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
145
}
221
146
222
223
/* Mark processes as completed when they exit, and save their exit
147
const char *argp_program_version = "plugbasedclient 0.9";
148
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
150
process *process_list = NULL;
151
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
}
253
}
254
255
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
257
ssize_t ret;
258
for(size_t written = 0; written < length; written += (size_t)ret){
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
length - written));
261
if(ret < 0){
262
return false;
263
}
264
}
265
return true;
266
}
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
}
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;
302
171
}
303
172
304
173
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
307
FILE *conffp;
174
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
308
175
size_t d_name_len;
309
176
DIR *dir = NULL;
310
177
struct dirent *dirst;
318
185
struct sigaction old_sigchld_action;
319
186
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
320
187
.sa_flags = SA_NOCLDSTOP };
321
char **custom_argv = NULL;
322
int custom_argc = 0;
188
char *plus_options = NULL;
189
char **plus_argv = NULL;
323
190
324
191
/* Establish a signal handler */
325
192
sigemptyset(&sigchld_action.sa_mask);
326
193
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
if(ret == -1){
194
if(ret < 0){
328
195
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
330
goto fallback;
196
exit(EXIT_FAILURE);
331
197
}
332
198
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
if(ret == -1){
199
if(ret < 0){
334
200
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
336
goto fallback;
201
exit(EXIT_FAILURE);
337
202
}
338
203
339
204
/* The options we understand. */
341
206
{ .name = "global-options", .key = 'g',
342
207
.arg = "OPTION[,OPTION[,...]]",
343
208
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
345
.arg = "VAR=value",
346
.doc = "Environment variable passed to all plugins" },
347
209
{ .name = "options-for", .key = 'o',
348
210
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
349
211
.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" },
353
212
{ .name = "disable", .key = 'd',
354
213
.arg = "PLUGIN",
355
214
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
359
215
{ .name = "plugin-dir", .key = 128,
360
216
.arg = "DIRECTORY",
361
217
.doc = "Specify a different plugin directory", .group = 2 },
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 },
218
{ .name = "userid", .key = 129,
219
.arg = "ID", .flags = 0,
220
.doc = "User ID the plugins will run as", .group = 2 },
221
{ .name = "groupid", .key = 130,
222
.arg = "ID", .flags = 0,
223
.doc = "Group ID the plugins will run as", .group = 2 },
224
{ .name = "debug", .key = 131,
225
.doc = "Debug mode", .group = 3 },
373
226
{ .name = NULL }
374
227
};
375
228
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
230
/* Get the INPUT argument from `argp_parse', which we know is a
231
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
378
233
switch (key) {
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
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
399
}
400
break;
401
case 'o': /* --options-for */
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
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 */
234
case 'g':
235
if (arg != NULL){
236
char *p = strtok(arg, ",");
237
do{
238
addargument(getplugin(NULL, plugins), p);
239
p = strtok(NULL, ",");
240
} while (p != NULL);
241
}
242
break;
243
case 'o':
244
if (arg != NULL){
245
char *name = strtok(arg, ":");
246
char *p = strtok(NULL, ":");
247
if(p != NULL){
248
p = strtok(p, ",");
249
do{
250
addargument(getplugin(name, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
}
255
break;
256
case 'd':
257
if (arg != NULL){
258
getplugin(arg, plugins)->disabled = true;
259
}
260
break;
261
case 128:
262
plugindir = arg;
263
break;
264
case 129:
467
265
uid = (uid_t)strtol(arg, NULL, 10);
468
266
break;
469
case 131: /* --groupid */
267
case 130:
470
268
gid = (gid_t)strtol(arg, NULL, 10);
471
269
break;
472
case 132: /* --debug */
270
case 131:
473
271
debug = true;
474
272
break;
475
273
case ARGP_KEY_ARG:
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 = "",
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
275
argp_usage (state);
276
}
277
plus_options = arg;
278
break;
279
case ARGP_KEY_END:
280
break;
281
default:
282
return ARGP_ERR_UNKNOWN;
283
}
284
return 0;
285
}
286
287
plugin *plugin_list = NULL;
288
289
struct argp argp = { .options = options, .parser = parse_opt,
290
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
527
291
.doc = "Mandos plugin runner -- Run plugins" };
528
292
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);
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
532
294
if (ret == ARGP_ERR_UNKNOWN){
533
fprintf(stderr, "Unknown error while parsing arguments\n");
295
fprintf(stderr, "Unkown error while parsing arguments\n");
534
296
exitstatus = EXIT_FAILURE;
535
goto fallback;
297
goto end;
536
298
}
537
299
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
}
547
if(conffp != NULL){
548
char *org_line = NULL;
549
char *p, *arg, *new_arg, *line;
550
size_t size = 0;
551
ssize_t sret;
552
const char whitespace_delims[] = " \r\t\f\v\n";
553
const char comment_delim[] = "#";
554
555
custom_argc = 1;
556
custom_argv = malloc(sizeof(char*) * 2);
557
if(custom_argv == NULL){
300
if(plus_options){
301
/* This is a mangled argument in the form of
302
"+--option+--other-option=parameter+--yet-another-option", etc */
303
/* Make new argc and argv vars, and call argp_parse() again. */
304
plus_options++; /* skip the first '+' character */
305
const char delims[] = "+";
306
char *arg;
307
int new_argc = 1;
308
plus_argv = malloc(sizeof(char*) * 2);
309
if(plus_argv == NULL){
558
310
perror("malloc");
559
311
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 */
567
while(true){
568
sret = getline(&org_line, &size, conffp);
569
if(sret == -1){
570
break;
571
}
572
573
line = org_line;
574
arg = strsep(&line, comment_delim);
575
while((p = strsep(&arg, whitespace_delims)) != NULL){
576
if(p[0] == '\0'){
577
continue;
578
}
579
new_arg = strdup(p);
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;
598
}
599
}
600
free(org_line);
601
} else {
602
/* Check for harmful errors and go to fallback. Other errors might
603
not affect opening plugins */
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
perror("fopen");
606
exitstatus = EXIT_FAILURE;
607
goto fallback;
608
}
609
}
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
612
if(custom_argv != NULL){
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
312
goto end;
313
}
314
plus_argv[0] = argv[0];
315
plus_argv[1] = NULL;
316
arg = strtok(plus_options, delims); /* Get first argument */
317
while(arg != NULL){
318
new_argc++;
319
plus_argv = realloc(plus_argv, sizeof(char *)
320
* ((unsigned int) new_argc + 1));
321
if(plus_argv == NULL){
322
perror("realloc");
323
exitstatus = EXIT_FAILURE;
324
goto end;
325
}
326
plus_argv[new_argc-1] = arg;
327
plus_argv[new_argc] = NULL;
328
arg = strtok(NULL, delims); /* Get next argument */
329
}
330
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
615
331
if (ret == ARGP_ERR_UNKNOWN){
616
fprintf(stderr, "Unknown error while parsing arguments\n");
332
fprintf(stderr, "Unkown error while parsing arguments\n");
617
333
exitstatus = EXIT_FAILURE;
618
goto fallback;
334
goto end;
619
335
}
620
336
}
621
337
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
631
338
if(debug){
632
339
for(plugin *p = plugin_list; p != NULL; p=p->next){
633
340
fprintf(stderr, "Plugin: %s has %d arguments\n",
635
342
for(char **a = p->argv; *a != NULL; a++){
636
343
fprintf(stderr, "\tArg: %s\n", *a);
637
344
}
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
}
642
345
}
643
346
}
644
347
645
/* Strip permissions down to nobody */
646
348
ret = setuid(uid);
647
349
if (ret == -1){
648
350
perror("setuid");
649
}
351
}
352
650
353
setgid(gid);
651
354
if (ret == -1){
652
355
perror("setgid");
653
356
}
654
357
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
358
dir = opendir(plugindir);
661
359
if(dir == NULL){
662
360
perror("Could not open plugin dir");
663
361
exitstatus = EXIT_FAILURE;
664
goto fallback;
362
goto end;
665
363
}
666
364
667
365
/* Set the FD_CLOEXEC flag on the directory, if possible */
672
370
if(ret < 0){
673
371
perror("set_cloexec_flag");
674
372
exitstatus = EXIT_FAILURE;
675
goto fallback;
373
goto end;
676
374
}
677
375
}
678
376
}
679
377
680
378
FD_ZERO(&rfds_all);
681
379
682
/* Read and execute any executable in the plugin directory*/
683
380
while(true){
684
381
dirst = readdir(dir);
685
382
686
/* All directory entries have been processed */
383
// All directory entries have been processed
687
384
if(dirst == NULL){
688
385
if (errno == EBADF){
689
386
perror("readdir");
690
387
exitstatus = EXIT_FAILURE;
691
goto fallback;
388
goto end;
692
389
}
693
390
break;
694
391
}
695
392
696
393
d_name_len = strlen(dirst->d_name);
697
394
698
/* Ignore dotfiles, backup files and other junk */
395
// Ignore dotfiles, backup files and other junk
699
396
{
700
397
bool bad_name = false;
701
398
716
413
break;
717
414
}
718
415
}
416
719
417
if(bad_name){
720
418
continue;
721
419
}
420
722
421
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
723
422
size_t suf_len = strlen(*suf);
724
423
if((d_name_len >= suf_len)
737
436
continue;
738
437
}
739
438
}
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");
749
continue;
750
}
439
440
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
441
if (filename == NULL){
442
perror("malloc");
443
exitstatus = EXIT_FAILURE;
444
goto end;
445
}
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
751
449
752
450
ret = stat(filename, &st);
753
451
if (ret == -1){
754
452
perror("stat");
755
free(filename);
756
continue;
453
exitstatus = EXIT_FAILURE;
454
goto end;
757
455
}
758
759
/* Ignore non-executable files */
456
760
457
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
761
458
if(debug){
762
459
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
765
462
free(filename);
766
463
continue;
767
464
}
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){
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
776
466
if(debug){
777
467
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
778
468
dirst->d_name);
780
470
free(filename);
781
471
continue;
782
472
}
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
783
474
{
784
475
/* Add global arguments to argument list for this plugin */
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];
476
plugin *g = getplugin(NULL, &plugin_list);
477
for(char **a = g->argv + 1; *a != NULL; a++){
478
addargument(p, *a);
479
}
480
}
481
int pipefd[2];
812
482
ret = pipe(pipefd);
813
483
if (ret == -1){
814
484
perror("pipe");
815
485
exitstatus = EXIT_FAILURE;
816
goto fallback;
486
goto end;
817
487
}
818
/* Ask OS to automatic close the pipe on exec */
819
488
ret = set_cloexec_flag(pipefd[0]);
820
489
if(ret < 0){
821
490
perror("set_cloexec_flag");
822
491
exitstatus = EXIT_FAILURE;
823
goto fallback;
492
goto end;
824
493
}
825
494
ret = set_cloexec_flag(pipefd[1]);
826
495
if(ret < 0){
827
496
perror("set_cloexec_flag");
828
497
exitstatus = EXIT_FAILURE;
829
goto fallback;
498
goto end;
830
499
}
831
500
/* Block SIGCHLD until process is safely in process list */
832
501
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
833
502
if(ret < 0){
834
503
perror("sigprocmask");
835
504
exitstatus = EXIT_FAILURE;
836
goto fallback;
505
goto end;
837
506
}
838
/* Starting a new process to be watched */
507
// Starting a new process to be watched
839
508
pid_t pid = fork();
840
if(pid == -1){
841
perror("fork");
842
exitstatus = EXIT_FAILURE;
843
goto fallback;
844
}
845
509
if(pid == 0){
846
510
/* this is the child process */
847
511
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
866
530
above and must now close it manually here. */
867
531
closedir(dir);
868
532
}
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
}
533
if(execv(filename, p->argv) < 0){
534
perror("execv");
535
_exit(EXIT_FAILURE);
879
536
}
880
537
/* no return */
881
538
}
882
/* Parent process */
883
close(pipefd[1]); /* Close unused write end of pipe */
539
/* parent process */
884
540
free(filename);
885
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
887
perror("getplugin");
541
close(pipefd[1]); /* close unused write end of pipe */
542
process *new_process = malloc(sizeof(process));
543
if (new_process == NULL){
544
perror("malloc");
888
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
889
546
if(ret < 0){
890
perror("sigprocmask");
547
perror("sigprocmask");
891
548
}
892
549
exitstatus = EXIT_FAILURE;
893
goto fallback;
550
goto end;
894
551
}
895
552
896
new_plugin->pid = pid;
897
new_plugin->fd = pipefd[0];
898
553
*new_process = (struct process){ .pid = pid,
554
.fd = pipefd[0],
555
.next = process_list };
556
// List handling
557
process_list = new_process;
899
558
/* Unblock SIGCHLD so signal handler can be run if this process
900
559
has already completed */
901
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
902
561
if(ret < 0){
903
562
perror("sigprocmask");
904
563
exitstatus = EXIT_FAILURE;
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
564
goto end;
565
}
566
567
FD_SET(new_process->fd, &rfds_all);
568
569
if (maxfd < new_process->fd){
570
maxfd = new_process->fd;
571
}
572
573
}
574
575
/* Free the plugin list */
576
for(plugin *next; plugin_list != NULL; plugin_list = next){
577
next = plugin_list->next;
578
free(plugin_list->argv);
579
free(plugin_list);
914
580
}
915
581
916
582
closedir(dir);
917
583
dir = 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
}
584
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
588
goto end;
928
589
}
929
930
/* Main loop while running plugins exist */
931
while(plugin_list){
590
while(process_list){
932
591
fd_set rfds = rfds_all;
933
592
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
934
593
if (select_ret == -1){
935
594
perror("select");
936
595
exitstatus = EXIT_FAILURE;
937
goto fallback;
596
goto end;
938
597
}
939
598
/* OK, now either a process completed, or something can be read
940
599
from one of them */
941
for(plugin *proc = plugin_list; proc != NULL;){
600
for(process *proc = process_list; proc ; proc = proc->next){
942
601
/* Is this process completely done? */
943
602
if(proc->eof and proc->completed){
944
603
/* Only accept the plugin output if it exited cleanly */
945
604
if(not WIFEXITED(proc->status)
946
605
or WEXITSTATUS(proc->status) != 0){
947
606
/* Bad exit by plugin */
948
949
607
if(debug){
950
608
if(WIFEXITED(proc->status)){
951
fprintf(stderr, "Plugin %u exited with status %d\n",
952
(unsigned int) (proc->pid),
953
WEXITSTATUS(proc->status));
609
fprintf(stderr, "Plugin %d exited with status %d\n",
610
proc->pid, WEXITSTATUS(proc->status));
954
611
} else if(WIFSIGNALED(proc->status)) {
955
fprintf(stderr, "Plugin %u killed by signal %d\n",
956
(unsigned int) (proc->pid),
957
WTERMSIG(proc->status));
612
fprintf(stderr, "Plugin %d killed by signal %d\n",
613
proc->pid, WTERMSIG(proc->status));
958
614
} else if(WCOREDUMP(proc->status)){
959
fprintf(stderr, "Plugin %d dumped core\n",
960
(unsigned int) (proc->pid));
615
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
961
616
}
962
617
}
963
964
618
/* Remove the plugin */
965
619
FD_CLR(proc->fd, &rfds_all);
966
967
620
/* Block signal while modifying process_list */
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
621
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
622
if(ret < 0){
970
623
perror("sigprocmask");
971
624
exitstatus = EXIT_FAILURE;
972
goto fallback;
973
}
974
625
goto end;
626
}
627
/* Delete this process entry from the list */
628
if(process_list == proc){
629
/* First one - simple */
630
process_list = proc->next;
631
} else {
632
/* Second one or later */
633
for(process *p = process_list; p != NULL; p = p->next){
634
if(p->next == proc){
635
p->next = proc->next;
636
break;
637
}
638
}
639
}
975
640
/* We are done modifying process list, so unblock signal */
976
641
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
642
NULL);
978
643
if(ret < 0){
979
644
perror("sigprocmask");
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;
645
}
646
free(proc->buffer);
647
free(proc);
648
/* We deleted this process from the list, so we can't go
649
proc->next. Therefore, start over from the beginning of
650
the process list */
651
break;
992
652
}
993
994
653
/* This process exited nicely, so print its buffer */
995
996
bool bret = print_out_password(proc->buffer,
997
proc->buffer_length);
998
if(not bret){
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
654
for(size_t written = 0; written < proc->buffer_length;
655
written += (size_t)ret){
656
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
657
proc->buffer + written,
658
proc->buffer_length
659
- written));
660
if(ret < 0){
661
perror("write");
662
exitstatus = EXIT_FAILURE;
663
goto end;
664
}
1001
665
}
1002
goto fallback;
666
goto end;
1003
667
}
1004
1005
668
/* This process has not completed. Does it have any output? */
1006
669
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1007
670
/* This process had nothing to say at this time */
1008
proc = proc->next;
1009
671
continue;
1010
672
}
1011
673
/* Before reading, make the process' data buffer large enough */
1015
677
if (proc->buffer == NULL){
1016
678
perror("malloc");
1017
679
exitstatus = EXIT_FAILURE;
1018
goto fallback;
680
goto end;
1019
681
}
1020
682
proc->buffer_size += BUFFER_SIZE;
1021
683
}
1024
686
BUFFER_SIZE);
1025
687
if(ret < 0){
1026
688
/* Read error from this process; ignore the error */
1027
proc = proc->next;
1028
689
continue;
1029
690
}
1030
691
if(ret == 0){
1035
696
}
1036
697
}
1037
698
}
1038
1039
1040
fallback:
1041
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1043
/* Fallback if all plugins failed, none are found or an error
1044
occured */
1045
bool bret;
1046
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1047
char *passwordbuffer = getpass("Password: ");
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);
1055
if(not bret){
1056
perror("print_out_password");
1057
exitstatus = EXIT_FAILURE;
1058
}
699
if(process_list == NULL){
700
fprintf(stderr, "All plugin processes failed, exiting\n");
701
exitstatus = EXIT_FAILURE;
1059
702
}
1060
703
704
end:
1061
705
/* Restore old signal handler */
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);
706
sigaction(SIGCHLD, &old_sigchld_action, NULL);
707
708
free(plus_argv);
709
710
/* Free the plugin list */
711
for(plugin *next; plugin_list != NULL; plugin_list = next){
712
next = plugin_list->next;
713
free(plugin_list->argv);
714
free(plugin_list);
1073
715
}
1074
716
1075
717
if(dir != NULL){
1077
719
}
1078
720
1079
721
/* Free the process list and kill the processes */
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
}
722
for(process *next; process_list != NULL; process_list = next){
723
next = process_list->next;
724
close(process_list->fd);
725
ret = kill(process_list->pid, SIGTERM);
726
if(ret == -1 and errno != ESRCH){
727
/* set-uid proccesses migth not get closed */
728
perror("kill");
1088
729
}
730
free(process_list->buffer);
731
free(process_list);
1089
732
}
1090
733
1091
734
/* Wait for any remaining child processes to terminate */
1095
738
if(errno != ECHILD){
1096
739
perror("wait");
1097
740
}
1098
1099
free_plugin_list();
1100
1101
free(plugindir);
1102
free(argfile);
1103
741
1104
742
return exitstatus;
1105
743
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0