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- Committer: Björn Påhlsson
- Date: 2008-08-11 16:35:32 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 66.
- Revision ID: belorn@braxen-20080811163532-er1zd4q2j4ykfv11
Fixed fallback on error in mandos-client
fixed a bug in password-request
fixed a bug in password-request
- 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;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
258
178
for(size_t written = 0; written < length; written += (size_t)ret){
259
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
180
length - written));
265
185
return true;
266
186
}
267
187
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
292
}
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
302
}
303
304
188
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
307
FILE *conffp;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
308
190
size_t d_name_len;
309
191
DIR *dir = NULL;
310
192
struct dirent *dirst;
318
200
struct sigaction old_sigchld_action;
319
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
320
202
.sa_flags = SA_NOCLDSTOP };
321
char **custom_argv = NULL;
322
int custom_argc = 0;
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
206
errno = 0;
323
207
324
208
/* Establish a signal handler */
325
209
sigemptyset(&sigchld_action.sa_mask);
326
210
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
if(ret == -1){
211
if(ret < 0){
328
212
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
330
goto fallback;
213
exit(EXIT_FAILURE);
331
214
}
332
215
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
if(ret == -1){
216
if(ret < 0){
334
217
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
336
goto fallback;
218
exit(EXIT_FAILURE);
337
219
}
338
220
339
221
/* The options we understand. */
341
223
{ .name = "global-options", .key = 'g',
342
224
.arg = "OPTION[,OPTION[,...]]",
343
225
.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
226
{ .name = "options-for", .key = 'o',
348
227
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
349
228
.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
229
{ .name = "disable", .key = 'd',
354
230
.arg = "PLUGIN",
355
231
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
359
232
{ .name = "plugin-dir", .key = 128,
360
233
.arg = "DIRECTORY",
361
234
.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 },
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 },
373
243
{ .name = NULL }
374
244
};
375
245
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
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;
378
250
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
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
405
}
406
break;
407
case 'o': /* --options-for */
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
415
break;
416
}
417
char *p;
418
while((p = strsep(&opt, ",")) != NULL){
419
if(p[0] == '\0'){
420
continue;
421
}
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
425
}
426
}
427
}
428
break;
429
case 'E': /* --env-for */
430
if(arg == NULL){
431
break;
432
}
433
{
434
char *envdef = strchr(arg, ':');
435
if(envdef == NULL){
436
break;
437
}
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
439
if(p_name == NULL){
440
break;
441
}
442
envdef++;
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
445
}
446
}
447
break;
448
case 'd': /* --disable */
449
if (arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = true;
455
}
456
break;
457
case 'e': /* --enable */
458
if (arg != NULL){
459
plugin *p = getplugin(arg);
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
462
}
463
p->disabled = false;
464
}
465
break;
466
case 128: /* --plugin-dir */
467
plugindir = strdup(arg);
468
if(plugindir == NULL){
469
perror("strdup");
470
}
471
break;
472
case 129: /* --config-file */
473
/* This is already done by parse_opt_config_file() */
474
break;
475
case 130: /* --userid */
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:
476
282
uid = (uid_t)strtol(arg, NULL, 10);
477
283
break;
478
case 131: /* --groupid */
284
case 130:
479
285
gid = (gid_t)strtol(arg, NULL, 10);
480
286
break;
481
case 132: /* --debug */
287
case 131:
482
288
debug = true;
483
289
break;
484
290
case ARGP_KEY_ARG:
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
break;
487
case ARGP_KEY_END:
488
break;
489
default:
490
return ARGP_ERR_UNKNOWN;
491
}
492
return 0;
493
}
494
495
/* This option parser is the same as parse_opt() above, except it
496
ignores everything but the --config-file option. */
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
switch (key) {
501
case 'g': /* --global-options */
502
case 'G': /* --global-env */
503
case 'o': /* --options-for */
504
case 'E': /* --env-for */
505
case 'd': /* --disable */
506
case 'e': /* --enable */
507
case 128: /* --plugin-dir */
508
break;
509
case 129: /* --config-file */
510
argfile = strdup(arg);
511
if(argfile == NULL){
512
perror("strdup");
291
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
292
argp_usage (state);
513
293
}
514
break;
515
case 130: /* --userid */
516
case 131: /* --groupid */
517
case 132: /* --debug */
518
case ARGP_KEY_ARG:
294
plus_options = arg;
295
break;
519
296
case ARGP_KEY_END:
520
297
break;
521
298
default:
524
301
return 0;
525
302
}
526
303
527
struct argp argp = { .options = options,
528
.parser = parse_opt_config_file,
529
.args_doc = "",
304
plugin *plugin_list = NULL;
305
306
struct argp argp = { .options = options, .parser = parse_opt,
307
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
530
308
.doc = "Mandos plugin runner -- Run plugins" };
531
309
532
/* Parse using the parse_opt_config_file in order to get the custom
533
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
310
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
535
311
if (ret == ARGP_ERR_UNKNOWN){
536
312
fprintf(stderr, "Unknown error while parsing arguments\n");
537
313
exitstatus = EXIT_FAILURE;
538
goto fallback;
314
goto end;
539
315
}
540
316
541
/* Reset to the normal argument parser */
542
argp.parser = parse_opt;
543
544
/* Open the configfile if available */
545
if (argfile == NULL){
546
conffp = fopen(AFILE, "r");
547
} else {
548
conffp = fopen(argfile, "r");
549
}
550
if(conffp != NULL){
551
char *org_line = NULL;
552
char *p, *arg, *new_arg, *line;
553
size_t size = 0;
554
ssize_t sret;
555
const char whitespace_delims[] = " \r\t\f\v\n";
556
const char comment_delim[] = "#";
557
558
custom_argc = 1;
559
custom_argv = malloc(sizeof(char*) * 2);
560
if(custom_argv == NULL){
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){
561
327
perror("malloc");
562
328
exitstatus = EXIT_FAILURE;
563
goto fallback;
564
}
565
custom_argv[0] = argv[0];
566
custom_argv[1] = NULL;
567
568
/* for each line in the config file, strip whitespace and ignore
569
commented text */
570
while(true){
571
sret = getline(&org_line, &size, conffp);
572
if(sret == -1){
573
break;
574
}
575
576
line = org_line;
577
arg = strsep(&line, comment_delim);
578
while((p = strsep(&arg, whitespace_delims)) != NULL){
579
if(p[0] == '\0'){
580
continue;
581
}
582
new_arg = strdup(p);
583
if(new_arg == NULL){
584
perror("strdup");
585
exitstatus = EXIT_FAILURE;
586
free(org_line);
587
goto fallback;
588
}
589
590
custom_argc += 1;
591
custom_argv = realloc(custom_argv, sizeof(char *)
592
* ((unsigned int) custom_argc + 1));
593
if(custom_argv == NULL){
594
perror("realloc");
595
exitstatus = EXIT_FAILURE;
596
free(org_line);
597
goto fallback;
598
}
599
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
601
}
602
}
603
free(org_line);
604
} else {
605
/* Check for harmful errors and go to fallback. Other errors might
606
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
608
perror("fopen");
609
exitstatus = EXIT_FAILURE;
610
goto fallback;
611
}
612
}
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
615
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
617
0, NULL);
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);
618
348
if (ret == ARGP_ERR_UNKNOWN){
619
349
fprintf(stderr, "Unknown error while parsing arguments\n");
620
350
exitstatus = EXIT_FAILURE;
621
goto fallback;
351
goto end;
622
352
}
623
353
}
624
354
625
/* Parse actual command line arguments, to let them override the
626
config file */
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
631
goto fallback;
632
}
633
634
355
if(debug){
635
356
for(plugin *p = plugin_list; p != NULL; p=p->next){
636
357
fprintf(stderr, "Plugin: %s has %d arguments\n",
638
359
for(char **a = p->argv; *a != NULL; a++){
639
360
fprintf(stderr, "\tArg: %s\n", *a);
640
361
}
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
642
for(char **a = p->environ; *a != NULL; a++){
643
fprintf(stderr, "\t%s\n", *a);
644
}
645
362
}
646
363
}
647
364
648
/* Strip permissions down to nobody */
649
365
ret = setuid(uid);
650
366
if (ret == -1){
651
367
perror("setuid");
652
}
368
}
369
653
370
setgid(gid);
654
371
if (ret == -1){
655
372
perror("setgid");
656
373
}
657
374
658
if (plugindir == NULL){
659
dir = opendir(PDIR);
660
} else {
661
dir = opendir(plugindir);
662
}
663
375
dir = opendir(plugindir);
664
376
if(dir == NULL){
665
377
perror("Could not open plugin dir");
666
378
exitstatus = EXIT_FAILURE;
667
goto fallback;
379
goto end;
668
380
}
669
381
670
382
/* Set the FD_CLOEXEC flag on the directory, if possible */
675
387
if(ret < 0){
676
388
perror("set_cloexec_flag");
677
389
exitstatus = EXIT_FAILURE;
678
goto fallback;
390
goto end;
679
391
}
680
392
}
681
393
}
682
394
683
395
FD_ZERO(&rfds_all);
684
396
685
/* Read and execute any executable in the plugin directory*/
686
397
while(true){
687
398
dirst = readdir(dir);
688
399
689
/* All directory entries have been processed */
400
// All directory entries have been processed
690
401
if(dirst == NULL){
691
402
if (errno == EBADF){
692
403
perror("readdir");
693
404
exitstatus = EXIT_FAILURE;
694
goto fallback;
405
goto end;
695
406
}
696
407
break;
697
408
}
698
409
699
410
d_name_len = strlen(dirst->d_name);
700
411
701
/* Ignore dotfiles, backup files and other junk */
412
// Ignore dotfiles, backup files and other junk
702
413
{
703
414
bool bad_name = false;
704
415
719
430
break;
720
431
}
721
432
}
433
722
434
if(bad_name){
723
435
continue;
724
436
}
437
725
438
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
726
439
size_t suf_len = strlen(*suf);
727
440
if((d_name_len >= suf_len)
740
453
continue;
741
454
}
742
455
}
743
744
char *filename;
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
if(ret < 0){
747
perror("asprintf");
748
continue;
456
457
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
458
if (filename == NULL){
459
perror("malloc");
460
exitstatus = EXIT_FAILURE;
461
goto end;
749
462
}
463
strcpy(filename, plugindir); /* Spurious warning */
464
strcat(filename, "/"); /* Spurious warning */
465
strcat(filename, dirst->d_name); /* Spurious warning */
750
466
751
467
ret = stat(filename, &st);
752
468
if (ret == -1){
753
469
perror("stat");
754
free(filename);
755
continue;
470
exitstatus = EXIT_FAILURE;
471
goto end;
756
472
}
757
758
/* Ignore non-executable files */
473
759
474
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
475
if(debug){
761
476
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
764
479
free(filename);
765
480
continue;
766
481
}
767
768
plugin *p = getplugin(dirst->d_name);
769
if(p == NULL){
770
perror("getplugin");
771
free(filename);
772
continue;
773
}
774
if(p->disabled){
482
if(getplugin(dirst->d_name, &plugin_list)->disabled){
775
483
if(debug){
776
484
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
777
485
dirst->d_name);
779
487
free(filename);
780
488
continue;
781
489
}
490
plugin *p = getplugin(dirst->d_name, &plugin_list);
782
491
{
783
492
/* Add global arguments to argument list for this plugin */
784
plugin *g = getplugin(NULL);
785
if(g != NULL){
786
for(char **a = g->argv + 1; *a != NULL; a++){
787
if(not add_argument(p, *a)){
788
perror("add_argument");
789
}
790
}
791
/* Add global environment variables */
792
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
794
perror("add_environment");
795
}
796
}
797
}
798
}
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
801
process, too. */
802
if(p->environ[0] != NULL){
803
for(char **e = environ; *e != NULL; e++){
804
if(not add_environment(p, *e, false)){
805
perror("add_environment");
806
}
807
}
808
}
809
810
int pipefd[2];
493
plugin *g = getplugin(NULL, &plugin_list);
494
for(char **a = g->argv + 1; *a != NULL; a++){
495
addargument(p, *a);
496
}
497
}
498
int pipefd[2];
811
499
ret = pipe(pipefd);
812
500
if (ret == -1){
813
501
perror("pipe");
814
502
exitstatus = EXIT_FAILURE;
815
goto fallback;
503
goto end;
816
504
}
817
/* Ask OS to automatic close the pipe on exec */
818
505
ret = set_cloexec_flag(pipefd[0]);
819
506
if(ret < 0){
820
507
perror("set_cloexec_flag");
821
508
exitstatus = EXIT_FAILURE;
822
goto fallback;
509
goto end;
823
510
}
824
511
ret = set_cloexec_flag(pipefd[1]);
825
512
if(ret < 0){
826
513
perror("set_cloexec_flag");
827
514
exitstatus = EXIT_FAILURE;
828
goto fallback;
515
goto end;
829
516
}
830
517
/* Block SIGCHLD until process is safely in process list */
831
518
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
832
519
if(ret < 0){
833
520
perror("sigprocmask");
834
521
exitstatus = EXIT_FAILURE;
835
goto fallback;
522
goto end;
836
523
}
837
/* Starting a new process to be watched */
524
// Starting a new process to be watched
838
525
pid_t pid = fork();
839
if(pid == -1){
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
842
goto fallback;
843
}
844
526
if(pid == 0){
845
527
/* this is the child process */
846
528
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
865
547
above and must now close it manually here. */
866
548
closedir(dir);
867
549
}
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
872
}
873
} else {
874
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
877
}
550
if(execv(filename, p->argv) < 0){
551
perror("execv");
552
_exit(EXIT_FAILURE);
878
553
}
879
554
/* no return */
880
555
}
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
556
/* parent process */
883
557
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
558
close(pipefd[1]); /* close unused write end of pipe */
559
process *new_process = malloc(sizeof(process));
560
if (new_process == NULL){
561
perror("malloc");
887
562
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
563
if(ret < 0){
889
perror("sigprocmask");
564
perror("sigprocmask");
890
565
}
891
566
exitstatus = EXIT_FAILURE;
892
goto fallback;
567
goto end;
893
568
}
894
569
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
570
*new_process = (struct process){ .pid = pid,
571
.fd = pipefd[0],
572
.next = process_list };
573
// List handling
574
process_list = new_process;
898
575
/* Unblock SIGCHLD so signal handler can be run if this process
899
576
has already completed */
900
577
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
901
578
if(ret < 0){
902
579
perror("sigprocmask");
903
580
exitstatus = EXIT_FAILURE;
904
goto fallback;
905
}
906
907
FD_SET(new_plugin->fd, &rfds_all);
908
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
911
}
912
581
goto end;
582
}
583
584
FD_SET(new_process->fd, &rfds_all);
585
586
if (maxfd < new_process->fd){
587
maxfd = new_process->fd;
588
}
589
590
}
591
592
/* Free the plugin list */
593
for(plugin *next; plugin_list != NULL; plugin_list = next){
594
next = plugin_list->next;
595
free(plugin_list->argv);
596
free(plugin_list);
913
597
}
914
598
915
599
closedir(dir);
916
600
dir = NULL;
917
918
for(plugin *p = plugin_list; p != NULL; p = p->next){
919
if(p->pid != 0){
920
break;
921
}
922
if(p->next == NULL){
923
fprintf(stderr, "No plugin processes started. Incorrect plugin"
924
" directory?\n");
925
free_plugin_list();
926
}
601
602
if (process_list == NULL){
603
fprintf(stderr, "No plugin processes started. Incorrect plugin"
604
" directory?\n");
605
process_list = NULL;
927
606
}
928
929
/* Main loop while running plugins exist */
930
while(plugin_list){
607
while(process_list){
931
608
fd_set rfds = rfds_all;
932
609
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
933
610
if (select_ret == -1){
934
611
perror("select");
935
612
exitstatus = EXIT_FAILURE;
936
goto fallback;
613
goto end;
937
614
}
938
615
/* OK, now either a process completed, or something can be read
939
616
from one of them */
940
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
617
for(process *proc = process_list; proc ; proc = proc->next){
941
618
/* Is this process completely done? */
942
619
if(proc->eof and proc->completed){
943
620
/* Only accept the plugin output if it exited cleanly */
944
621
if(not WIFEXITED(proc->status)
945
622
or WEXITSTATUS(proc->status) != 0){
946
623
/* Bad exit by plugin */
947
948
624
if(debug){
949
625
if(WIFEXITED(proc->status)){
950
626
fprintf(stderr, "Plugin %u exited with status %d\n",
959
635
(unsigned int) (proc->pid));
960
636
}
961
637
}
962
963
638
/* Remove the plugin */
964
639
FD_CLR(proc->fd, &rfds_all);
965
966
640
/* Block signal while modifying process_list */
967
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
641
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
968
642
if(ret < 0){
969
643
perror("sigprocmask");
970
644
exitstatus = EXIT_FAILURE;
971
goto fallback;
972
}
973
free_plugin(proc);
645
goto end;
646
}
647
/* Delete this process entry from the list */
648
if(process_list == proc){
649
/* First one - simple */
650
process_list = proc->next;
651
} else {
652
/* Second one or later */
653
for(process *p = process_list; p != NULL; p = p->next){
654
if(p->next == proc){
655
p->next = proc->next;
656
break;
657
}
658
}
659
}
974
660
/* We are done modifying process list, so unblock signal */
975
661
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
976
662
NULL);
977
663
if(ret < 0){
978
664
perror("sigprocmask");
979
exitstatus = EXIT_FAILURE;
980
goto fallback;
981
}
982
983
if(plugin_list == NULL){
984
break;
985
}
986
continue;
665
}
666
free(proc->buffer);
667
free(proc);
668
/* We deleted this process from the list, so we can't go
669
proc->next. Therefore, start over from the beginning of
670
the process list */
671
break;
987
672
}
988
989
673
/* This process exited nicely, so print its buffer */
990
674
991
bool bret = print_out_password(proc->buffer,
992
proc->buffer_length);
675
bool bret = print_out_password(proc->buffer, proc->buffer_length);
993
676
if(not bret){
994
677
perror("print_out_password");
995
678
exitstatus = EXIT_FAILURE;
996
679
}
997
goto fallback;
680
goto end;
998
681
}
999
1000
682
/* This process has not completed. Does it have any output? */
1001
683
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1002
684
/* This process had nothing to say at this time */
1009
691
if (proc->buffer == NULL){
1010
692
perror("malloc");
1011
693
exitstatus = EXIT_FAILURE;
1012
goto fallback;
694
goto end;
1013
695
}
1014
696
proc->buffer_size += BUFFER_SIZE;
1015
697
}
1030
712
}
1031
713
1032
714
1033
fallback:
715
end:
1034
716
1035
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1036
/* Fallback if all plugins failed, none are found or an error
1037
occured */
717
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
718
/* Fallback if all plugins failed or an error occured */
1038
719
bool bret;
1039
720
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1040
721
char *passwordbuffer = getpass("Password: ");
1041
size_t len = strlen(passwordbuffer);
1042
/* Strip trailing newline */
1043
if(len > 0 and passwordbuffer[len-1] == '\n'){
1044
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1045
len--;
1046
}
1047
bret = print_out_password(passwordbuffer, len);
722
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1048
723
if(not bret){
1049
724
perror("print_out_password");
1050
725
exitstatus = EXIT_FAILURE;
726
goto end;
1051
727
}
1052
728
}
1053
729
1054
730
/* Restore old signal handler */
1055
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1056
if(ret == -1){
1057
perror("sigaction");
1058
exitstatus = EXIT_FAILURE;
1059
}
1060
1061
if(custom_argv != NULL){
1062
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1063
free(*arg);
1064
}
1065
free(custom_argv);
731
sigaction(SIGCHLD, &old_sigchld_action, NULL);
732
733
free(plus_argv);
734
735
/* Free the plugin list */
736
for(plugin *next; plugin_list != NULL; plugin_list = next){
737
next = plugin_list->next;
738
free(plugin_list->argv);
739
free(plugin_list);
1066
740
}
1067
741
1068
742
if(dir != NULL){
1070
744
}
1071
745
1072
746
/* Free the process list and kill the processes */
1073
for(plugin *p = plugin_list; p != NULL; p = p->next){
1074
if(p->pid != 0){
1075
close(p->fd);
1076
ret = kill(p->pid, SIGTERM);
1077
if(ret == -1 and errno != ESRCH){
1078
/* Set-uid proccesses might not get closed */
1079
perror("kill");
1080
}
747
for(process *next; process_list != NULL; process_list = next){
748
next = process_list->next;
749
close(process_list->fd);
750
ret = kill(process_list->pid, SIGTERM);
751
if(ret == -1 and errno != ESRCH){
752
/* set-uid proccesses migth not get closed */
753
perror("kill");
1081
754
}
755
free(process_list->buffer);
756
free(process_list);
1082
757
}
1083
758
1084
759
/* Wait for any remaining child processes to terminate */
1088
763
if(errno != ECHILD){
1089
764
perror("wait");
1090
765
}
1091
1092
free_plugin_list();
1093
1094
free(plugindir);
1095
free(argfile);
1096
766
1097
767
return exitstatus;
1098
768
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0