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- Committer: Teddy Hogeborn
- Date: 2008-08-25 09:09:15 UTC
- mfrom: (24.1.71 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080825090915-dxlxgb4pw1kqsui5
Merge.
- files added:
- COPYING
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- 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
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
28
42
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
readdir(), closedir(), dirfd() */
37
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
48
55
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
66
67
#define BUFFER_SIZE 256
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>";
52
74
53
75
struct process;
54
76
58
80
char *buffer;
59
81
size_t buffer_size;
60
82
size_t buffer_length;
83
bool eof;
84
volatile bool completed;
85
volatile int status;
61
86
struct process *next;
62
87
} process;
63
88
65
90
char *name; /* can be NULL or any plugin name */
66
91
char **argv;
67
92
int argc;
93
char **environ;
94
int envc;
68
95
bool disabled;
69
96
struct plugin *next;
70
97
} plugin;
71
98
72
plugin *getplugin(char *name, plugin **plugin_list){
99
static plugin *getplugin(char *name, plugin **plugin_list){
73
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
74
101
if ((p->name == name)
75
102
or (p->name and name and (strcmp(p->name, name) == 0))){
79
106
/* Create a new plugin */
80
107
plugin *new_plugin = malloc(sizeof(plugin));
81
108
if (new_plugin == NULL){
82
perror("malloc");
83
exit(EXIT_FAILURE);
84
}
85
new_plugin->name = name;
109
return NULL;
110
}
111
char *copy_name = NULL;
112
if(name != NULL){
113
copy_name = strdup(name);
114
if(copy_name == NULL){
115
return NULL;
116
}
117
}
118
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
124
86
125
new_plugin->argv = malloc(sizeof(char *) * 2);
87
126
if (new_plugin->argv == NULL){
88
perror("malloc");
89
exit(EXIT_FAILURE);
127
free(copy_name);
128
free(new_plugin);
129
return NULL;
90
130
}
91
new_plugin->argv[0] = name;
131
new_plugin->argv[0] = copy_name;
92
132
new_plugin->argv[1] = NULL;
93
new_plugin->argc = 1;
94
new_plugin->disabled = false;
95
new_plugin->next = *plugin_list;
133
134
new_plugin->environ = malloc(sizeof(char *));
135
if(new_plugin->environ == NULL){
136
free(copy_name);
137
free(new_plugin->argv);
138
free(new_plugin);
139
return NULL;
140
}
141
new_plugin->environ[0] = NULL;
96
142
/* Append the new plugin to the list */
97
143
*plugin_list = new_plugin;
98
144
return new_plugin;
99
145
}
100
146
101
void addargument(plugin *p, char *arg){
102
p->argv[p->argc] = arg;
103
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
104
if (p->argv == NULL){
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
p->argc++;
109
p->argv[p->argc] = NULL;
110
}
147
/* Helper function for add_argument and add_environment */
148
static bool add_to_char_array(const char *new, char ***array,
149
int *len){
150
/* Resize the pointed-to array to hold one more pointer */
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
153
/* Malloc check */
154
if(*array == NULL){
155
return false;
156
}
157
/* Make a copy of the new string */
158
char *copy = strdup(new);
159
if(copy == NULL){
160
return false;
161
}
162
/* Insert the copy */
163
(*array)[*len] = copy;
164
(*len)++;
165
/* Add a new terminating NULL pointer to the last element */
166
(*array)[*len] = NULL;
167
return true;
168
}
169
170
/* Add to a plugin's argument vector */
171
static bool add_argument(plugin *p, const char *arg){
172
if(p == NULL){
173
return false;
174
}
175
return add_to_char_array(arg, &(p->argv), &(p->argc));
176
}
177
178
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
180
if(p == NULL){
181
return false;
182
}
183
return add_to_char_array(def, &(p->environ), &(p->envc));
184
}
185
111
186
112
187
/*
113
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
114
189
* Descriptor Flags".
115
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
116
191
*/
117
int set_cloexec_flag(int fd)
192
static int set_cloexec_flag(int fd)
118
193
{
119
194
int ret = fcntl(fd, F_GETFD, 0);
120
195
/* If reading the flags failed, return error indication now. */
125
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
126
201
}
127
202
128
129
#define BUFFER_SIZE 256
130
131
const char *argp_program_version =
132
"plugbasedclient 0.9";
133
const char *argp_program_bug_address =
134
"<mandos@fukt.bsnet.se>";
203
process *process_list = NULL;
204
205
/* Mark processes as completed when they exit, and save their exit
206
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
208
while(true){
209
process *proc = process_list;
210
int status;
211
pid_t pid = waitpid(-1, &status, WNOHANG);
212
if(pid == 0){
213
/* Only still running child processes */
214
break;
215
}
216
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
219
}
220
/* No child processes */
221
break;
222
}
223
224
/* A child exited, find it in process_list */
225
while(proc != NULL and proc->pid != pid){
226
proc = proc->next;
227
}
228
if(proc == NULL){
229
/* Process not found in process list */
230
continue;
231
}
232
proc->status = status;
233
proc->completed = true;
234
}
235
}
236
237
bool print_out_password(const char *buffer, size_t length){
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
for(size_t written = 0; written < length; written += (size_t)ret){
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
length - written));
245
if(ret < 0){
246
return false;
247
}
248
}
249
return true;
250
}
251
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
264
}
265
}
135
266
136
267
int main(int argc, char *argv[]){
137
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
268
char *plugindir = NULL;
269
char *argfile = NULL;
270
FILE *conffp;
138
271
size_t d_name_len;
139
DIR *dir;
272
DIR *dir = NULL;
140
273
struct dirent *dirst;
141
274
struct stat st;
142
275
fd_set rfds_all;
143
276
int ret, maxfd = 0;
144
process *process_list = NULL;
277
uid_t uid = 65534;
278
gid_t gid = 65534;
145
279
bool debug = false;
146
280
int exitstatus = EXIT_SUCCESS;
281
struct sigaction old_sigchld_action;
282
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
283
.sa_flags = SA_NOCLDSTOP };
284
char **custom_argv = NULL;
285
int custom_argc = 0;
286
287
/* Establish a signal handler */
288
sigemptyset(&sigchld_action.sa_mask);
289
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
290
if(ret == -1){
291
perror("sigaddset");
292
exitstatus = EXIT_FAILURE;
293
goto fallback;
294
}
295
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
296
if(ret == -1){
297
perror("sigaction");
298
exitstatus = EXIT_FAILURE;
299
goto fallback;
300
}
147
301
148
302
/* The options we understand. */
149
303
struct argp_option options[] = {
150
304
{ .name = "global-options", .key = 'g',
151
305
.arg = "OPTION[,OPTION[,...]]",
152
306
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
308
.arg = "VAR=value",
309
.doc = "Environment variable passed to all plugins" },
153
310
{ .name = "options-for", .key = 'o',
154
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
155
312
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
314
.arg = "PLUGIN:ENV=value",
315
.doc = "Environment variable passed to specified plugin" },
156
316
{ .name = "disable", .key = 'd',
157
317
.arg = "PLUGIN",
158
318
.doc = "Disable a specific plugin", .group = 1 },
159
319
{ .name = "plugin-dir", .key = 128,
160
320
.arg = "DIRECTORY",
161
321
.doc = "Specify a different plugin directory", .group = 2 },
162
{ .name = "debug", .key = 129,
163
.doc = "Debug mode", .group = 3 },
322
{ .name = "config-file", .key = 129,
323
.arg = "FILE",
324
.doc = "Specify a different configuration file", .group = 2 },
325
{ .name = "userid", .key = 130,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 3 },
328
{ .name = "groupid", .key = 131,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 3 },
331
{ .name = "debug", .key = 132,
332
.doc = "Debug mode", .group = 4 },
164
333
{ .name = NULL }
165
334
};
166
335
167
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
168
/* Get the INPUT argument from `argp_parse', which we
169
know is a pointer to our plugin list pointer. */
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
170
339
plugin **plugins = state->input;
171
340
switch (key) {
172
341
case 'g':
173
342
if (arg != NULL){
174
char *p = strtok(arg, ",");
175
do{
176
addargument(getplugin(NULL, plugins), p);
177
p = strtok(NULL, ",");
178
} while (p);
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
346
continue;
347
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
349
perror("add_argument");
350
return ARGP_ERR_UNKNOWN;
351
}
352
}
353
}
354
break;
355
case 'e':
356
if(arg == NULL){
357
break;
358
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
179
367
}
180
368
break;
181
369
case 'o':
182
370
if (arg != NULL){
183
char *name = strtok(arg, ":");
184
char *p = strtok(NULL, ":");
185
if(p){
186
p = strtok(p, ",");
187
do{
188
addargument(getplugin(name, plugins), p);
189
p = strtok(NULL, ",");
190
} while (p);
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
389
}
390
}
391
}
392
break;
393
case 'f':
394
if(arg == NULL){
395
break;
396
}
397
{
398
char *envdef = strchr(arg, ':');
399
if(envdef == NULL){
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
408
perror("add_environment");
191
409
}
192
410
}
193
411
break;
194
412
case 'd':
195
413
if (arg != NULL){
196
getplugin(arg, plugins)->disabled = true;
414
plugin *p = getplugin(arg, plugins);
415
if(p == NULL){
416
return ARGP_ERR_UNKNOWN;
417
}
418
p->disabled = true;
197
419
}
198
420
break;
199
421
case 128:
200
plugindir = arg;
422
plugindir = strdup(arg);
423
if(plugindir == NULL){
424
perror("strdup");
425
}
201
426
break;
202
427
case 129:
428
argfile = strdup(arg);
429
if(argfile == NULL){
430
perror("strdup");
431
}
432
break;
433
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
435
break;
436
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
203
440
debug = true;
204
441
break;
205
442
case ARGP_KEY_ARG:
206
argp_usage (state);
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
207
444
break;
208
445
case ARGP_KEY_END:
209
446
break;
216
453
plugin *plugin_list = NULL;
217
454
218
455
struct argp argp = { .options = options, .parser = parse_opt,
219
.args_doc = "",
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
220
457
.doc = "Mandos plugin runner -- Run plugins" };
221
458
222
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
461
fprintf(stderr, "Unknown error while parsing arguments\n");
462
exitstatus = EXIT_FAILURE;
463
goto fallback;
464
}
465
466
if (argfile == NULL){
467
conffp = fopen(AFILE, "r");
468
} else {
469
conffp = fopen(argfile, "r");
470
}
471
472
if(conffp != NULL){
473
char *org_line = NULL;
474
char *p, *arg, *new_arg, *line;
475
size_t size = 0;
476
ssize_t sret;
477
const char whitespace_delims[] = " \r\t\f\v\n";
478
const char comment_delim[] = "#";
479
480
custom_argc = 1;
481
custom_argv = malloc(sizeof(char*) * 2);
482
if(custom_argv == NULL){
483
perror("malloc");
484
exitstatus = EXIT_FAILURE;
485
goto fallback;
486
}
487
custom_argv[0] = argv[0];
488
custom_argv[1] = NULL;
489
490
while(true){
491
sret = getline(&org_line, &size, conffp);
492
if(sret == -1){
493
break;
494
}
495
496
line = org_line;
497
arg = strsep(&line, comment_delim);
498
while((p = strsep(&arg, whitespace_delims)) != NULL){
499
if(p[0] == '\0'){
500
continue;
501
}
502
new_arg = strdup(p);
503
if(new_arg == NULL){
504
perror("strdup");
505
exitstatus = EXIT_FAILURE;
506
free(org_line);
507
goto fallback;
508
}
509
510
custom_argc += 1;
511
custom_argv = realloc(custom_argv, sizeof(char *)
512
* ((unsigned int) custom_argc + 1));
513
if(custom_argv == NULL){
514
perror("realloc");
515
exitstatus = EXIT_FAILURE;
516
free(org_line);
517
goto fallback;
518
}
519
custom_argv[custom_argc-1] = new_arg;
520
custom_argv[custom_argc] = NULL;
521
}
522
}
523
free(org_line);
524
} else{
525
/* Check for harmful errors and go to fallback. Other errors might
526
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
perror("fopen");
529
exitstatus = EXIT_FAILURE;
530
goto fallback;
531
}
532
}
533
534
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
537
fprintf(stderr, "Unknown error while parsing arguments\n");
538
exitstatus = EXIT_FAILURE;
539
goto fallback;
540
}
541
}
223
542
224
543
if(debug){
225
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
228
547
for(char **a = p->argv; *a != NULL; a++){
229
548
fprintf(stderr, "\tArg: %s\n", *a);
230
549
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
551
for(char **a = p->environ; *a != NULL; a++){
552
fprintf(stderr, "\t%s\n", *a);
553
}
231
554
}
232
555
}
233
556
234
dir = opendir(plugindir);
557
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
562
setgid(gid);
563
if (ret == -1){
564
perror("setgid");
565
}
566
567
if (plugindir == NULL){
568
dir = opendir(PDIR);
569
} else {
570
dir = opendir(plugindir);
571
}
572
235
573
if(dir == NULL){
236
574
perror("Could not open plugin dir");
237
575
exitstatus = EXIT_FAILURE;
238
goto end;
576
goto fallback;
239
577
}
578
240
579
/* Set the FD_CLOEXEC flag on the directory, if possible */
241
580
{
242
581
int dir_fd = dirfd(dir);
245
584
if(ret < 0){
246
585
perror("set_cloexec_flag");
247
586
exitstatus = EXIT_FAILURE;
248
goto end;
587
goto fallback;
249
588
}
250
589
}
251
590
}
252
591
253
if(dir == NULL){
254
fprintf(stderr, "Can not open directory\n");
255
return EXIT_FAILURE;
256
}
257
258
592
FD_ZERO(&rfds_all);
259
593
260
594
while(true){
262
596
263
597
// All directory entries have been processed
264
598
if(dirst == NULL){
599
if (errno == EBADF){
600
perror("readdir");
601
exitstatus = EXIT_FAILURE;
602
goto fallback;
603
}
265
604
break;
266
605
}
267
606
311
650
continue;
312
651
}
313
652
}
314
315
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
316
if (filename == NULL){
317
perror("malloc");
318
exitstatus = EXIT_FAILURE;
319
goto end;
320
}
321
strcpy(filename, plugindir);
322
strcat(filename, "/");
323
strcat(filename, dirst->d_name);
324
325
stat(filename, &st);
326
653
654
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
656
if(ret < 0){
657
perror("asprintf");
658
continue;
659
}
660
661
ret = stat(filename, &st);
662
if (ret == -1){
663
perror("stat");
664
free(filename);
665
continue;
666
}
667
327
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
328
669
if(debug){
329
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
330
671
" with bad type or mode\n", filename);
331
672
}
332
continue;
333
}
334
if(getplugin(dirst->d_name, &plugin_list)->disabled){
673
free(filename);
674
continue;
675
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
677
if(p == NULL){
678
perror("getplugin");
679
free(filename);
680
continue;
681
}
682
if(p->disabled){
335
683
if(debug){
336
684
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
337
685
dirst->d_name);
338
686
}
687
free(filename);
339
688
continue;
340
689
}
341
plugin *p = getplugin(dirst->d_name, &plugin_list);
342
690
{
343
691
/* Add global arguments to argument list for this plugin */
344
692
plugin *g = getplugin(NULL, &plugin_list);
345
for(char **a = g->argv + 1; *a != NULL; a++){
346
addargument(p, *a);
347
}
348
}
349
int pipefd[2];
693
if(g != NULL){
694
for(char **a = g->argv + 1; *a != NULL; a++){
695
if(not add_argument(p, *a)){
696
perror("add_argument");
697
}
698
}
699
/* Add global environment variables */
700
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
702
perror("add_environment");
703
}
704
}
705
}
706
}
707
/* If this plugin has any environment variables, we will call
708
using execve and need to duplicate the environment from this
709
process, too. */
710
if(p->environ[0] != NULL){
711
for(char **e = environ; *e != NULL; e++){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
718
perror("add_environment");
719
}
720
}
721
}
722
723
int pipefd[2];
350
724
ret = pipe(pipefd);
351
725
if (ret == -1){
352
726
perror("pipe");
353
727
exitstatus = EXIT_FAILURE;
354
goto end;
728
goto fallback;
355
729
}
356
730
ret = set_cloexec_flag(pipefd[0]);
357
731
if(ret < 0){
358
732
perror("set_cloexec_flag");
359
733
exitstatus = EXIT_FAILURE;
360
goto end;
734
goto fallback;
361
735
}
362
736
ret = set_cloexec_flag(pipefd[1]);
363
737
if(ret < 0){
364
738
perror("set_cloexec_flag");
365
739
exitstatus = EXIT_FAILURE;
366
goto end;
740
goto fallback;
741
}
742
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
744
if(ret < 0){
745
perror("sigprocmask");
746
exitstatus = EXIT_FAILURE;
747
goto fallback;
367
748
}
368
749
// Starting a new process to be watched
369
750
pid_t pid = fork();
751
if(pid == -1){
752
perror("fork");
753
exitstatus = EXIT_FAILURE;
754
goto fallback;
755
}
370
756
if(pid == 0){
371
757
/* this is the child process */
372
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
758
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
759
if(ret < 0){
760
perror("sigaction");
761
_exit(EXIT_FAILURE);
762
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
if(ret < 0){
765
perror("sigprocmask");
766
_exit(EXIT_FAILURE);
767
}
768
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
if(ret == -1){
771
perror("dup2");
772
_exit(EXIT_FAILURE);
773
}
373
774
374
775
if(dirfd(dir) < 0){
375
776
/* If dir has no file descriptor, we could not set FD_CLOEXEC
376
and must close it manually */
777
above and must now close it manually here. */
377
778
closedir(dir);
378
779
}
379
if(execv(filename, p->argv) < 0){
380
perror("execv");
381
_exit(EXIT_FAILURE);
780
if(p->environ[0] == NULL){
781
if(execv(filename, p->argv) < 0){
782
perror("execv");
783
_exit(EXIT_FAILURE);
784
}
785
} else {
786
if(execve(filename, p->argv, p->environ) < 0){
787
perror("execve");
788
_exit(EXIT_FAILURE);
789
}
382
790
}
383
791
/* no return */
384
792
}
385
793
/* parent process */
794
free(filename);
386
795
close(pipefd[1]); /* close unused write end of pipe */
387
796
process *new_process = malloc(sizeof(process));
388
797
if (new_process == NULL){
389
798
perror("malloc");
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
800
if(ret < 0){
801
perror("sigprocmask");
802
}
390
803
exitstatus = EXIT_FAILURE;
391
goto end;
804
goto fallback;
392
805
}
393
806
394
807
*new_process = (struct process){ .pid = pid,
395
808
.fd = pipefd[0],
396
809
.next = process_list };
810
// List handling
811
process_list = new_process;
812
/* Unblock SIGCHLD so signal handler can be run if this process
813
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
815
if(ret < 0){
816
perror("sigprocmask");
817
exitstatus = EXIT_FAILURE;
818
goto fallback;
819
}
820
397
821
FD_SET(new_process->fd, &rfds_all);
398
822
399
823
if (maxfd < new_process->fd){
400
824
maxfd = new_process->fd;
401
825
}
402
826
403
//List handling
404
process_list = new_process;
405
}
406
407
/* Free the plugin list */
408
for(plugin *next; plugin_list != NULL; plugin_list = next){
409
next = plugin_list->next;
410
free(plugin_list->argv);
411
free(plugin_list);
412
}
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
413
831
414
832
closedir(dir);
415
833
dir = NULL;
834
416
835
if (process_list == NULL){
417
fprintf(stderr, "No plugin processes started, exiting\n");
418
return EXIT_FAILURE;
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
419
839
}
420
while(true){
840
while(process_list){
421
841
fd_set rfds = rfds_all;
422
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
423
843
if (select_ret == -1){
424
844
perror("select");
425
845
exitstatus = EXIT_FAILURE;
426
goto end;
846
goto fallback;
427
847
}
848
/* OK, now either a process completed, or something can be read
849
from one of them */
428
850
for(process *proc = process_list; proc ; proc = proc->next){
429
if(not FD_ISSET(proc->fd, &rfds)){
851
/* Is this process completely done? */
852
if(proc->eof and proc->completed){
853
/* Only accept the plugin output if it exited cleanly */
854
if(not WIFEXITED(proc->status)
855
or WEXITSTATUS(proc->status) != 0){
856
/* Bad exit by plugin */
857
if(debug){
858
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
861
WEXITSTATUS(proc->status));
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
865
WTERMSIG(proc->status));
866
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
869
}
870
}
871
/* Remove the plugin */
872
FD_CLR(proc->fd, &rfds_all);
873
/* Block signal while modifying process_list */
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
875
if(ret < 0){
876
perror("sigprocmask");
877
exitstatus = EXIT_FAILURE;
878
goto fallback;
879
}
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
893
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
896
if(ret < 0){
897
perror("sigprocmask");
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
905
}
906
/* This process exited nicely, so print its buffer */
907
908
bool bret = print_out_password(proc->buffer,
909
proc->buffer_length);
910
if(not bret){
911
perror("print_out_password");
912
exitstatus = EXIT_FAILURE;
913
}
914
goto fallback;
915
}
916
/* This process has not completed. Does it have any output? */
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
918
/* This process had nothing to say at this time */
430
919
continue;
431
920
}
921
/* Before reading, make the process' data buffer large enough */
432
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
433
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
434
924
+ (size_t) BUFFER_SIZE);
435
925
if (proc->buffer == NULL){
436
926
perror("malloc");
437
927
exitstatus = EXIT_FAILURE;
438
goto end;
928
goto fallback;
439
929
}
440
930
proc->buffer_size += BUFFER_SIZE;
441
931
}
932
/* Read from the process */
442
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
443
934
BUFFER_SIZE);
444
935
if(ret < 0){
445
/* Read error from this process; ignore it */
936
/* Read error from this process; ignore the error */
446
937
continue;
447
938
}
448
proc->buffer_length += (size_t) ret;
449
939
if(ret == 0){
450
940
/* got EOF */
451
/* wait for process exit */
452
int status;
453
waitpid(proc->pid, &status, 0);
454
if(not WIFEXITED(status) or WEXITSTATUS(status) != 0){
455
FD_CLR(proc->fd, &rfds_all);
456
continue;
457
}
458
for(size_t written = 0;
459
written < proc->buffer_length; written += (size_t)ret){
460
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
461
proc->buffer + written,
462
proc->buffer_length
463
- written));
464
if(ret < 0){
465
perror("write");
466
exitstatus = EXIT_FAILURE;
467
goto end;
468
}
469
}
470
goto end;
941
proc->eof = true;
942
} else {
943
proc->buffer_length += (size_t) ret;
471
944
}
472
945
}
473
946
}
474
475
end:
947
948
949
fallback:
950
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
952
/* Fallback if all plugins failed, none are found or an error
953
occured */
954
bool bret;
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
958
if(not bret){
959
perror("print_out_password");
960
exitstatus = EXIT_FAILURE;
961
}
962
}
963
964
/* Restore old signal handler */
965
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
966
if(ret == -1){
967
perror("sigaction");
968
exitstatus = EXIT_FAILURE;
969
}
970
971
if(custom_argv != NULL){
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
free(*arg);
974
}
975
free(custom_argv);
976
}
977
free_plugin_list(plugin_list);
978
979
if(dir != NULL){
980
closedir(dir);
981
}
982
983
/* Free the process list and kill the processes */
476
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
477
986
close(process_list->fd);
478
kill(process_list->pid, SIGTERM);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
991
}
479
992
free(process_list->buffer);
480
993
free(process_list);
481
994
}
482
995
483
while(true){
484
int status;
485
ret = wait(&status);
486
if (ret == -1){
487
if(errno != ECHILD){
488
perror("wait");
489
}
490
break;
491
}
492
}
996
/* Wait for any remaining child processes to terminate */
997
do{
998
ret = wait(NULL);
999
} while(ret >= 0);
1000
if(errno != ECHILD){
1001
perror("wait");
1002
}
1003
1004
free(plugindir);
1005
free(argfile);
1006
493
1007
return exitstatus;
494
1008
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0