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- Committer: Björn Påhlsson
- Date: 2008-08-15 20:47:22 UTC
- mfrom: (76 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 77.
- Revision ID: belorn@braxen-20080815204722-yvylhrvub57csggz
merge + minor adjustments
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- 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
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
22
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
27
26
#include <stddef.h> /* size_t, NULL */
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
53
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strsep, strlen(), strcpy(),
55
strcat() */
56
56
#include <errno.h> /* errno */
57
57
#include <argp.h> /* struct argp_option, struct
58
58
argp_state, struct argp,
59
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
61
#include <signal.h> /* struct sigaction, sigemptyset(),
63
62
sigaddset(), sigaction(),
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
SIG_UNBLOCK, kill() */
66
65
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
66
69
67
#define BUFFER_SIZE 256
70
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
68
#define ARGFILE "/conf/conf.d/mandos/plugins.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
75
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
72
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;
73
struct process;
84
74
85
/* Variables used for running processes*/
75
typedef struct process{
86
76
pid_t pid;
87
77
int fd;
88
78
char *buffer;
89
79
size_t buffer_size;
90
80
size_t buffer_length;
91
81
bool eof;
92
volatile bool completed;
93
volatile int status;
82
bool completed;
83
int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
bool disabled;
94
92
struct plugin *next;
95
93
} plugin;
96
94
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){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
if ((p->name == name)
98
or (p->name and name and (strcmp(p->name, name) == 0))){
106
99
return p;
107
100
}
108
101
}
109
102
/* Create a new plugin */
110
103
plugin *new_plugin = malloc(sizeof(plugin));
111
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
free(new_plugin);
119
return NULL;
120
}
121
}
122
123
*new_plugin = (plugin) { .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
127
104
if (new_plugin == NULL){
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
new_plugin->name = name;
128
109
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
130
free(copy_name);
131
free(new_plugin);
132
return NULL;
110
if (new_plugin->argv == NULL){
111
perror("malloc");
112
exit(EXIT_FAILURE);
133
113
}
134
new_plugin->argv[0] = copy_name;
114
new_plugin->argv[0] = name;
135
115
new_plugin->argv[1] = NULL;
136
137
new_plugin->environ = malloc(sizeof(char *));
138
if(new_plugin->environ == NULL){
139
free(copy_name);
140
free(new_plugin->argv);
141
free(new_plugin);
142
return NULL;
143
}
144
new_plugin->environ[0] = NULL;
145
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
146
119
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
120
*plugin_list = new_plugin;
148
121
return new_plugin;
149
122
}
150
123
151
/* Helper function for add_argument and add_environment */
152
static bool add_to_char_array(const char *new, char ***array,
153
int *len){
154
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
157
/* Malloc check */
158
if(*array == NULL){
159
return false;
160
}
161
/* Make a copy of the new string */
162
char *copy = strdup(new);
163
if(copy == NULL){
164
return false;
165
}
166
/* Insert the copy */
167
(*array)[*len] = copy;
168
(*len)++;
169
/* Add a new terminating NULL pointer to the last element */
170
(*array)[*len] = NULL;
171
return true;
172
}
173
174
/* Add to a plugin's argument vector */
175
static bool add_argument(plugin *p, const char *arg){
176
if(p == NULL){
177
return false;
178
}
179
return add_to_char_array(arg, &(p->argv), &(p->argc));
180
}
181
182
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
184
if(p == NULL){
185
return false;
186
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
return add_to_char_array(def, &(p->environ), &(p->envc));
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
128
perror("malloc");
129
exit(EXIT_FAILURE);
130
}
131
p->argc++;
132
p->argv[p->argc] = NULL;
205
133
}
206
134
207
135
/*
209
137
* Descriptor Flags".
210
138
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
139
*/
212
static int set_cloexec_flag(int fd){
140
static int set_cloexec_flag(int fd)
141
{
213
142
int ret = fcntl(fd, F_GETFD, 0);
214
143
/* If reading the flags failed, return error indication now. */
215
144
if(ret < 0){
219
148
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
149
}
221
150
151
process *process_list = NULL;
222
152
223
/* Mark processes as completed when they exit, and save their exit
153
/* Mark a process as completed when it exits, and save its exit
224
154
status. */
225
static 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
void handle_sigchld(__attribute__((unused)) int sig){
156
process *proc = process_list;
157
int status;
158
pid_t pid = wait(&status);
159
if(pid == -1){
160
perror("wait");
161
return;
162
}
163
while(proc != NULL and proc->pid != pid){
164
proc = proc->next;
165
}
166
if(proc == NULL){
167
/* Process not found in process list */
168
return;
169
}
170
proc->status = status;
171
proc->completed = true;
253
172
}
254
173
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
174
bool print_out_password(const char *buffer, size_t length){
257
175
ssize_t ret;
176
if(length>0 and buffer[length-1] == '\n'){
177
length--;
178
}
258
179
for(size_t written = 0; written < length; written += (size_t)ret){
259
180
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
181
length - written));
265
186
return true;
266
187
}
267
188
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);
189
char ** addcustomargument(char **argv, int *argc, char *arg){
280
190
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
}
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
292
196
}
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
}
197
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
198
argv[1] = NULL;
199
}
200
*argc += 1;
201
argv = realloc(argv, sizeof(char *)
202
* ((unsigned int) *argc + 1));
203
if(argv == NULL){
204
return NULL;
205
}
206
argv[*argc-1] = arg;
207
argv[*argc] = NULL;
208
return argv;
302
209
}
303
210
304
211
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
212
const char *plugindir = "/lib/mandos/plugins.d";
213
const char *argfile = ARGFILE;
307
214
FILE *conffp;
308
215
size_t d_name_len;
309
216
DIR *dir = NULL;
310
217
struct dirent *dirst;
311
218
struct stat st;
312
219
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
220
int ret, maxfd = 0;
316
221
uid_t uid = 65534;
317
222
gid_t gid = 65534;
318
223
bool debug = false;
326
231
/* Establish a signal handler */
327
232
sigemptyset(&sigchld_action.sa_mask);
328
233
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
329
if(ret == -1){
234
if(ret < 0){
330
235
perror("sigaddset");
331
exitstatus = EXIT_FAILURE;
332
goto fallback;
236
exit(EXIT_FAILURE);
333
237
}
334
238
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
335
if(ret == -1){
239
if(ret < 0){
336
240
perror("sigaction");
337
exitstatus = EXIT_FAILURE;
338
goto fallback;
241
exit(EXIT_FAILURE);
339
242
}
340
243
341
244
/* The options we understand. */
343
246
{ .name = "global-options", .key = 'g',
344
247
.arg = "OPTION[,OPTION[,...]]",
345
248
.doc = "Options passed to all plugins" },
346
{ .name = "global-env", .key = 'G',
347
.arg = "VAR=value",
348
.doc = "Environment variable passed to all plugins" },
349
249
{ .name = "options-for", .key = 'o',
350
250
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
351
251
.doc = "Options passed only to specified plugin" },
352
{ .name = "env-for", .key = 'E',
353
.arg = "PLUGIN:ENV=value",
354
.doc = "Environment variable passed to specified plugin" },
355
252
{ .name = "disable", .key = 'd',
356
253
.arg = "PLUGIN",
357
254
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
361
255
{ .name = "plugin-dir", .key = 128,
362
256
.arg = "DIRECTORY",
363
257
.doc = "Specify a different plugin directory", .group = 2 },
364
{ .name = "config-file", .key = 129,
365
.arg = "FILE",
366
.doc = "Specify a different configuration file", .group = 2 },
367
{ .name = "userid", .key = 130,
368
.arg = "ID", .flags = 0,
369
.doc = "User ID the plugins will run as", .group = 3 },
370
{ .name = "groupid", .key = 131,
371
.arg = "ID", .flags = 0,
372
.doc = "Group ID the plugins will run as", .group = 3 },
373
{ .name = "debug", .key = 132,
374
.doc = "Debug mode", .group = 4 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.doc = "Debug mode", .group = 3 },
375
266
{ .name = NULL }
376
267
};
377
268
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
381
case 'g': /* --global-options */
382
if(arg != NULL){
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
273
switch (key) {
274
case 'g':
275
if (arg != NULL){
383
276
char *p;
384
277
while((p = strsep(&arg, ",")) != NULL){
385
278
if(p[0] == '\0'){
386
279
continue;
387
280
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
391
}
281
addargument(getplugin(NULL, plugins), p);
392
282
}
393
283
}
394
284
break;
395
case 'G': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
401
}
402
break;
403
case 'o': /* --options-for */
404
if(arg != NULL){
405
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
285
case 'o':
286
if (arg != NULL){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
407
289
break;
408
290
}
409
291
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
411
break;
412
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
421
}
422
}
423
}
424
break;
425
case 'E': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
429
{
430
char *envdef = strchr(arg, ':');
431
if(envdef == NULL){
432
break;
433
}
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
436
perror("add_environment");
437
}
438
}
439
break;
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
443
if(p == NULL){
444
return ARGP_ERR_UNKNOWN;
445
}
446
p->disabled = true;
447
}
448
break;
449
case 'e': /* --enable */
450
if(arg != NULL){
451
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
454
}
455
p->disabled = false;
456
}
457
break;
458
case 128: /* --plugin-dir */
459
free(plugindir);
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
break;
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
486
}
487
break;
488
case 132: /* --debug */
292
if(opt[0] == '\0'){
293
break;
294
}
295
if(opt != NULL){
296
char *p;
297
while((p = strsep(&opt, ",")) != NULL){
298
if(p[0] == '\0'){
299
continue;
300
}
301
addargument(getplugin(name, plugins), p);
302
}
303
}
304
}
305
break;
306
case 'd':
307
if (arg != NULL){
308
getplugin(arg, plugins)->disabled = true;
309
}
310
break;
311
case 128:
312
plugindir = arg;
313
break;
314
case 129:
315
uid = (uid_t)strtol(arg, NULL, 10);
316
break;
317
case 130:
318
gid = (gid_t)strtol(arg, NULL, 10);
319
break;
320
case 131:
489
321
debug = true;
490
322
break;
491
/*
492
* When adding more options before this line, remember to also add a
493
* "case" to the "parse_opt_config_file" function below.
494
*/
495
case ARGP_KEY_ARG:
496
/* Cryptsetup always passes an argument, which is an empty
497
string if "none" was specified in /etc/crypttab. So if
498
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
default:
506
return ARGP_ERR_UNKNOWN;
507
}
508
return 0;
509
}
510
511
/* This option parser is the same as parse_opt() above, except it
512
ignores everything but the --config-file option. */
513
error_t parse_opt_config_file(int key, char *arg,
514
__attribute__((unused))
515
struct argp_state *state) {
516
switch(key) {
517
case 'g': /* --global-options */
518
case 'G': /* --global-env */
519
case 'o': /* --options-for */
520
case 'E': /* --env-for */
521
case 'd': /* --disable */
522
case 'e': /* --enable */
523
case 128: /* --plugin-dir */
524
break;
525
case 129: /* --config-file */
526
free(argfile);
527
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
532
case 130: /* --userid */
533
case 131: /* --groupid */
534
case 132: /* --debug */
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
break;
538
default:
539
return ARGP_ERR_UNKNOWN;
540
}
541
return 0;
542
}
543
544
struct argp argp = { .options = options,
545
.parser = parse_opt_config_file,
546
.args_doc = "",
323
case ARGP_KEY_ARG:
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
325
break;
326
case ARGP_KEY_END:
327
break;
328
default:
329
return ARGP_ERR_UNKNOWN;
330
}
331
return 0;
332
}
333
334
plugin *plugin_list = NULL;
335
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
547
338
.doc = "Mandos plugin runner -- Run plugins" };
548
339
549
/* Parse using parse_opt_config_file() in order to get the custom
550
config file location, if any. */
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
341
if (ret == ARGP_ERR_UNKNOWN){
553
342
fprintf(stderr, "Unknown error while parsing arguments\n");
554
343
exitstatus = EXIT_FAILURE;
555
goto fallback;
344
goto end;
556
345
}
557
558
/* Reset to the normal argument parser */
559
argp.parser = parse_opt;
560
561
/* Open the configfile if available */
562
if(argfile == NULL){
563
conffp = fopen(AFILE, "r");
564
} else {
565
conffp = fopen(argfile, "r");
566
}
346
347
conffp = fopen(argfile, "r");
567
348
if(conffp != NULL){
568
349
char *org_line = NULL;
350
size_t size = 0;
351
ssize_t sret;
569
352
char *p, *arg, *new_arg, *line;
570
size_t size = 0;
571
353
const char whitespace_delims[] = " \r\t\f\v\n";
572
354
const char comment_delim[] = "#";
573
355
574
custom_argc = 1;
575
custom_argv = malloc(sizeof(char*) * 2);
576
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
579
goto fallback;
580
}
581
custom_argv[0] = argv[0];
582
custom_argv[1] = NULL;
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
586
356
while(true){
587
357
sret = getline(&org_line, &size, conffp);
588
358
if(sret == -1){
596
366
continue;
597
367
}
598
368
new_arg = strdup(p);
599
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
602
free(org_line);
603
goto fallback;
604
}
605
606
custom_argc += 1;
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
614
}
615
custom_argv[custom_argc-1] = new_arg;
616
custom_argv[custom_argc] = NULL;
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
617
375
}
618
376
}
619
377
free(org_line);
620
} else {
378
} else{
621
379
/* Check for harmful errors and go to fallback. Other errors might
622
380
not affect opening plugins */
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
381
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
382
perror("fopen");
625
383
exitstatus = EXIT_FAILURE;
626
goto fallback;
384
goto end;
627
385
}
628
386
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
387
631
388
if(custom_argv != NULL){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
389
custom_argv[0] = argv[0];
390
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
391
if (ret == ARGP_ERR_UNKNOWN){
635
392
fprintf(stderr, "Unknown error while parsing arguments\n");
636
393
exitstatus = EXIT_FAILURE;
637
goto fallback;
394
goto end;
638
395
}
639
396
}
640
397
641
/* Parse actual command line arguments, to let them override the
642
config file */
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
650
398
if(debug){
651
399
for(plugin *p = plugin_list; p != NULL; p=p->next){
652
400
fprintf(stderr, "Plugin: %s has %d arguments\n",
654
402
for(char **a = p->argv; *a != NULL; a++){
655
403
fprintf(stderr, "\tArg: %s\n", *a);
656
404
}
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
658
for(char **a = p->environ; *a != NULL; a++){
659
fprintf(stderr, "\t%s\n", *a);
660
}
661
405
}
662
406
}
663
407
664
/* Strip permissions down to nobody */
665
408
ret = setuid(uid);
666
if(ret == -1){
409
if (ret == -1){
667
410
perror("setuid");
668
}
411
}
412
669
413
setgid(gid);
670
if(ret == -1){
414
if (ret == -1){
671
415
perror("setgid");
672
416
}
673
417
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
418
dir = opendir(plugindir);
680
419
if(dir == NULL){
681
420
perror("Could not open plugin dir");
682
421
exitstatus = EXIT_FAILURE;
683
goto fallback;
422
goto end;
684
423
}
685
424
686
425
/* Set the FD_CLOEXEC flag on the directory, if possible */
691
430
if(ret < 0){
692
431
perror("set_cloexec_flag");
693
432
exitstatus = EXIT_FAILURE;
694
goto fallback;
433
goto end;
695
434
}
696
435
}
697
436
}
698
437
699
438
FD_ZERO(&rfds_all);
700
439
701
/* Read and execute any executable in the plugin directory*/
702
440
while(true){
703
441
dirst = readdir(dir);
704
442
705
/* All directory entries have been processed */
443
// All directory entries have been processed
706
444
if(dirst == NULL){
707
if(errno == EBADF){
445
if (errno == EBADF){
708
446
perror("readdir");
709
447
exitstatus = EXIT_FAILURE;
710
goto fallback;
448
goto end;
711
449
}
712
450
break;
713
451
}
714
452
715
453
d_name_len = strlen(dirst->d_name);
716
454
717
/* Ignore dotfiles, backup files and other junk */
455
// Ignore dotfiles, backup files and other junk
718
456
{
719
457
bool bad_name = false;
720
458
722
460
723
461
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
462
".dpkg-old",
725
".dpkg-bak",
726
463
".dpkg-divert", NULL };
727
464
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
465
size_t pre_len = strlen(*pre);
736
473
break;
737
474
}
738
475
}
476
739
477
if(bad_name){
740
478
continue;
741
479
}
480
742
481
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
482
size_t suf_len = strlen(*suf);
744
483
if((d_name_len >= suf_len)
757
496
continue;
758
497
}
759
498
}
760
761
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
767
if(ret < 0){
768
perror("asprintf");
499
500
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
501
if (filename == NULL){
502
perror("malloc");
769
503
continue;
770
504
}
505
strcpy(filename, plugindir); /* Spurious warning */
506
strcat(filename, "/"); /* Spurious warning */
507
strcat(filename, dirst->d_name); /* Spurious warning */
771
508
772
509
ret = stat(filename, &st);
773
if(ret == -1){
510
if (ret == -1){
774
511
perror("stat");
775
512
free(filename);
776
513
continue;
777
514
}
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
515
516
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
781
517
if(debug){
782
518
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
519
" with bad type or mode\n", filename);
785
521
free(filename);
786
522
continue;
787
523
}
788
789
plugin *p = getplugin(dirst->d_name);
790
if(p == NULL){
791
perror("getplugin");
792
free(filename);
793
continue;
794
}
795
if(p->disabled){
524
if(getplugin(dirst->d_name, &plugin_list)->disabled){
796
525
if(debug){
797
526
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
798
527
dirst->d_name);
800
529
free(filename);
801
530
continue;
802
531
}
532
plugin *p = getplugin(dirst->d_name, &plugin_list);
803
533
{
804
534
/* Add global arguments to argument list for this plugin */
805
plugin *g = getplugin(NULL);
806
if(g != NULL){
807
for(char **a = g->argv + 1; *a != NULL; a++){
808
if(not add_argument(p, *a)){
809
perror("add_argument");
810
}
811
}
812
/* Add global environment variables */
813
for(char **e = g->environ; *e != NULL; e++){
814
if(not add_environment(p, *e, false)){
815
perror("add_environment");
816
}
817
}
818
}
819
}
820
/* If this plugin has any environment variables, we will call
821
using execve and need to duplicate the environment from this
822
process, too. */
823
if(p->environ[0] != NULL){
824
for(char **e = environ; *e != NULL; e++){
825
if(not add_environment(p, *e, false)){
826
perror("add_environment");
827
}
828
}
829
}
830
831
int pipefd[2];
535
plugin *g = getplugin(NULL, &plugin_list);
536
for(char **a = g->argv + 1; *a != NULL; a++){
537
addargument(p, *a);
538
}
539
}
540
int pipefd[2];
832
541
ret = pipe(pipefd);
833
if(ret == -1){
542
if (ret == -1){
834
543
perror("pipe");
835
544
exitstatus = EXIT_FAILURE;
836
goto fallback;
545
goto end;
837
546
}
838
/* Ask OS to automatic close the pipe on exec */
839
547
ret = set_cloexec_flag(pipefd[0]);
840
548
if(ret < 0){
841
549
perror("set_cloexec_flag");
842
550
exitstatus = EXIT_FAILURE;
843
goto fallback;
551
goto end;
844
552
}
845
553
ret = set_cloexec_flag(pipefd[1]);
846
554
if(ret < 0){
847
555
perror("set_cloexec_flag");
848
556
exitstatus = EXIT_FAILURE;
849
goto fallback;
557
goto end;
850
558
}
851
559
/* Block SIGCHLD until process is safely in process list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
560
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
561
if(ret < 0){
854
562
perror("sigprocmask");
855
563
exitstatus = EXIT_FAILURE;
856
goto fallback;
564
goto end;
857
565
}
858
/* Starting a new process to be watched */
566
// Starting a new process to be watched
859
567
pid_t pid = fork();
860
568
if(pid == -1){
861
569
perror("fork");
862
570
exitstatus = EXIT_FAILURE;
863
goto fallback;
571
goto end;
864
572
}
865
573
if(pid == 0){
866
574
/* this is the child process */
869
577
perror("sigaction");
870
578
_exit(EXIT_FAILURE);
871
579
}
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
581
if(ret < 0){
874
582
perror("sigprocmask");
875
583
_exit(EXIT_FAILURE);
876
584
}
877
585
878
586
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
587
if(ret == -1){
880
588
perror("dup2");
886
594
above and must now close it manually here. */
887
595
closedir(dir);
888
596
}
889
if(p->environ[0] == NULL){
890
if(execv(filename, p->argv) < 0){
891
perror("execv");
892
_exit(EXIT_FAILURE);
893
}
894
} else {
895
if(execve(filename, p->argv, p->environ) < 0){
896
perror("execve");
897
_exit(EXIT_FAILURE);
898
}
597
if(execv(filename, p->argv) < 0){
598
perror("execv");
599
_exit(EXIT_FAILURE);
899
600
}
900
601
/* no return */
901
602
}
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
603
/* parent process */
904
604
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
605
close(pipefd[1]); /* close unused write end of pipe */
606
process *new_process = malloc(sizeof(process));
607
if (new_process == NULL){
608
perror("malloc");
609
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
610
if(ret < 0){
910
perror("sigprocmask");
611
perror("sigprocmask");
911
612
}
912
613
exitstatus = EXIT_FAILURE;
913
goto fallback;
614
goto end;
914
615
}
915
616
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
617
*new_process = (struct process){ .pid = pid,
618
.fd = pipefd[0],
619
.next = process_list };
620
// List handling
621
process_list = new_process;
919
622
/* Unblock SIGCHLD so signal handler can be run if this process
920
623
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
624
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
625
if(ret < 0){
923
626
perror("sigprocmask");
924
627
exitstatus = EXIT_FAILURE;
925
goto fallback;
926
}
927
928
FD_SET(new_plugin->fd, &rfds_all);
929
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
932
}
628
goto end;
629
}
630
631
FD_SET(new_process->fd, &rfds_all);
632
633
if (maxfd < new_process->fd){
634
maxfd = new_process->fd;
635
}
636
637
}
638
639
/* Free the plugin list */
640
for(plugin *next; plugin_list != NULL; plugin_list = next){
641
next = plugin_list->next;
642
free(plugin_list->argv);
643
free(plugin_list);
933
644
}
934
645
935
646
closedir(dir);
936
647
dir = NULL;
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
648
649
if (process_list == NULL){
650
fprintf(stderr, "No plugin processes started. Incorrect plugin"
651
" directory?\n");
652
process_list = NULL;
947
653
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
654
while(process_list){
951
655
fd_set rfds = rfds_all;
952
656
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
657
if (select_ret == -1){
954
658
perror("select");
955
659
exitstatus = EXIT_FAILURE;
956
goto fallback;
660
goto end;
957
661
}
958
662
/* OK, now either a process completed, or something can be read
959
663
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
664
for(process *proc = process_list; proc ; proc = proc->next){
961
665
/* Is this process completely done? */
962
666
if(proc->eof and proc->completed){
963
667
/* Only accept the plugin output if it exited cleanly */
964
668
if(not WIFEXITED(proc->status)
965
669
or WEXITSTATUS(proc->status) != 0){
966
670
/* Bad exit by plugin */
967
968
671
if(debug){
969
672
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
673
fprintf(stderr, "Plugin %u exited with status %d\n",
674
(unsigned int) (proc->pid),
972
675
WEXITSTATUS(proc->status));
973
676
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
677
fprintf(stderr, "Plugin %u killed by signal %d\n",
678
(unsigned int) (proc->pid),
976
679
WTERMSIG(proc->status));
977
680
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
681
fprintf(stderr, "Plugin %d dumped core\n",
682
(unsigned int) (proc->pid));
980
683
}
981
684
}
982
983
685
/* Remove the plugin */
984
686
FD_CLR(proc->fd, &rfds_all);
985
986
687
/* Block signal while modifying process_list */
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
688
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
689
if(ret < 0){
989
690
perror("sigprocmask");
990
691
exitstatus = EXIT_FAILURE;
991
goto fallback;
992
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
692
goto end;
693
}
694
/* Delete this process entry from the list */
695
if(process_list == proc){
696
/* First one - simple */
697
process_list = proc->next;
698
} else {
699
/* Second one or later */
700
for(process *p = process_list; p != NULL; p = p->next){
701
if(p->next == proc){
702
p->next = proc->next;
703
break;
704
}
705
}
706
}
998
707
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
708
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
709
NULL);
1001
710
if(ret < 0){
1002
711
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
712
}
713
free(proc->buffer);
714
free(proc);
715
/* We deleted this process from the list, so we can't go
716
proc->next. Therefore, start over from the beginning of
717
the process list */
718
break;
1012
719
}
1013
1014
720
/* This process exited nicely, so print its buffer */
1015
1016
bool bret = print_out_password(proc->buffer,
1017
proc->buffer_length);
721
722
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1018
723
if(not bret){
1019
724
perror("print_out_password");
1020
725
exitstatus = EXIT_FAILURE;
1021
726
}
1022
goto fallback;
727
goto end;
1023
728
}
1024
1025
729
/* This process has not completed. Does it have any output? */
1026
730
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1027
731
/* This process had nothing to say at this time */
1028
proc = proc->next;
1029
732
continue;
1030
733
}
1031
734
/* Before reading, make the process' data buffer large enough */
1032
735
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1033
736
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
737
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
738
if (proc->buffer == NULL){
1036
739
perror("malloc");
1037
740
exitstatus = EXIT_FAILURE;
1038
goto fallback;
741
goto end;
1039
742
}
1040
743
proc->buffer_size += BUFFER_SIZE;
1041
744
}
1042
745
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
746
ret = read(proc->fd, proc->buffer + proc->buffer_length,
747
BUFFER_SIZE);
748
if(ret < 0){
1046
749
/* Read error from this process; ignore the error */
1047
proc = proc->next;
1048
750
continue;
1049
751
}
1050
if(sret == 0){
752
if(ret == 0){
1051
753
/* got EOF */
1052
754
proc->eof = true;
1053
755
} else {
1054
proc->buffer_length += (size_t) sret;
756
proc->buffer_length += (size_t) ret;
1055
757
}
1056
758
}
1057
759
}
1058
760
1059
761
1060
fallback:
762
end:
1061
763
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1063
/* Fallback if all plugins failed, none are found or an error
1064
occured */
764
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
765
/* Fallback if all plugins failed, none are found or an error occured */
1065
766
bool bret;
1066
767
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1067
768
char *passwordbuffer = getpass("Password: ");
1068
size_t len = strlen(passwordbuffer);
1069
/* Strip trailing newline */
1070
if(len > 0 and passwordbuffer[len-1] == '\n'){
1071
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1072
len--;
1073
}
1074
bret = print_out_password(passwordbuffer, len);
769
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1075
770
if(not bret){
1076
771
perror("print_out_password");
1077
772
exitstatus = EXIT_FAILURE;
773
goto end;
1078
774
}
1079
775
}
1080
776
1081
777
/* Restore old signal handler */
1082
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1083
if(ret == -1){
1084
perror("sigaction");
1085
exitstatus = EXIT_FAILURE;
1086
}
1087
1088
if(custom_argv != NULL){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1090
free(*arg);
1091
}
1092
free(custom_argv);
778
sigaction(SIGCHLD, &old_sigchld_action, NULL);
779
780
free(custom_argv);
781
782
/* Free the plugin list */
783
for(plugin *next; plugin_list != NULL; plugin_list = next){
784
next = plugin_list->next;
785
free(plugin_list->argv);
786
free(plugin_list);
1093
787
}
1094
788
1095
789
if(dir != NULL){
1096
790
closedir(dir);
1097
791
}
1098
792
1099
/* Kill the processes */
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
if(p->pid != 0){
1102
close(p->fd);
1103
ret = kill(p->pid, SIGTERM);
1104
if(ret == -1 and errno != ESRCH){
1105
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1107
}
793
/* Free the process list and kill the processes */
794
for(process *next; process_list != NULL; process_list = next){
795
next = process_list->next;
796
close(process_list->fd);
797
ret = kill(process_list->pid, SIGTERM);
798
if(ret == -1 and errno != ESRCH){
799
/* set-uid proccesses migth not get closed */
800
perror("kill");
1108
801
}
802
free(process_list->buffer);
803
free(process_list);
1109
804
}
1110
805
1111
806
/* Wait for any remaining child processes to terminate */
1116
811
perror("wait");
1117
812
}
1118
813
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
1124
814
return exitstatus;
1125
815
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0