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- Committer: Teddy Hogeborn
- Date: 2008-08-03 03:33:56 UTC
- Revision ID: teddy@fukt.bsnet.se-20080803033356-6aemgj0g0hoz91ow
* plugins.d/mandosclient.c (pgp_packet_decrypt): Renamed variables.
On debug, show
decrypted plaintext
in hexadecimal. Free
the GPGME data
buffers even on
errors.
On debug, show
decrypted plaintext
in hexadecimal. Free
the GPGME data
buffers even on
errors.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugbasedclient.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
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(), O_CLOEXEC */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
32
27
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
28
#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
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
43
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
37
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
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() */
58
48
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
75
52
76
53
#define BUFFER_SIZE 256
77
54
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
84
typedef struct plugin{
85
char *name; /* can be NULL or any plugin name */
86
char **argv;
87
int argc;
88
char **environ;
89
int envc;
90
bool disabled;
91
92
/* Variables used for running processes*/
55
struct process;
56
57
typedef struct process{
93
58
pid_t pid;
94
59
int fd;
95
60
char *buffer;
96
61
size_t buffer_size;
97
62
size_t buffer_length;
98
63
bool eof;
99
volatile sig_atomic_t completed;
64
bool completed;
100
65
int status;
66
struct process *next;
67
} process;
68
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
71
char **argv;
72
int argc;
73
bool disabled;
101
74
struct plugin *next;
102
75
} plugin;
103
76
104
static plugin *plugin_list = NULL;
105
106
/* Gets an existing plugin based on name,
107
or if none is found, creates a new one */
108
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
79
if ((p->name == name)
80
or (p->name and name and (strcmp(p->name, name) == 0))){
113
81
return p;
114
82
}
115
83
}
116
84
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
122
return NULL;
123
}
124
char *copy_name = NULL;
125
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
return NULL;
134
}
135
}
136
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
141
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
147
free(copy_name);
148
free(new_plugin);
149
errno = e;
150
return NULL;
151
}
152
new_plugin->argv[0] = copy_name;
85
plugin *new_plugin = malloc(sizeof(plugin));
86
if (new_plugin == NULL){
87
perror("malloc");
88
exit(EXIT_FAILURE);
89
}
90
new_plugin->name = name;
91
new_plugin->argv = malloc(sizeof(char *) * 2);
92
if (new_plugin->argv == NULL){
93
perror("malloc");
94
exit(EXIT_FAILURE);
95
}
96
new_plugin->argv[0] = name;
153
97
new_plugin->argv[1] = NULL;
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
158
if(new_plugin->environ == NULL){
159
int e = errno;
160
free(copy_name);
161
free(new_plugin->argv);
162
free(new_plugin);
163
errno = e;
164
return NULL;
165
}
166
new_plugin->environ[0] = NULL;
167
98
new_plugin->argc = 1;
99
new_plugin->disabled = false;
100
new_plugin->next = *plugin_list;
168
101
/* Append the new plugin to the list */
169
plugin_list = new_plugin;
102
*plugin_list = new_plugin;
170
103
return new_plugin;
171
104
}
172
105
173
/* Helper function for add_argument and add_environment */
174
static bool add_to_char_array(const char *new, char ***array,
175
int *len){
176
/* Resize the pointed-to array to hold one more pointer */
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
181
/* Malloc check */
182
if(*array == NULL){
183
return false;
184
}
185
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
190
if(copy == NULL){
191
return false;
192
}
193
/* Insert the copy */
194
(*array)[*len] = copy;
195
(*len)++;
196
/* Add a new terminating NULL pointer to the last element */
197
(*array)[*len] = NULL;
198
return true;
199
}
200
201
/* Add to a plugin's argument vector */
202
static bool add_argument(plugin *p, const char *arg){
203
if(p == NULL){
204
return false;
205
}
206
return add_to_char_array(arg, &(p->argv), &(p->argc));
207
}
208
209
/* Add to a plugin's environment */
210
static bool add_environment(plugin *p, const char *def, bool replace){
211
if(p == NULL){
212
return false;
213
}
214
/* namelen = length of name of environment variable */
215
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
219
/* It already exists */
220
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
226
return false;
227
}
228
*e = new;
229
strcpy(*e, def);
230
}
231
return true;
232
}
233
}
234
return add_to_char_array(def, &(p->environ), &(p->envc));
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
p->argc++;
114
p->argv[p->argc] = NULL;
235
115
}
236
116
237
117
/*
238
118
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
119
* Descriptor Flags".
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
120
* *Note File Descriptor Flags:(libc)Descriptor Flags.
241
121
*/
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
122
static int set_cloexec_flag(int fd)
123
{
124
int ret = fcntl(fd, F_GETFD, 0);
244
125
/* If reading the flags failed, return error indication now. */
245
126
if(ret < 0){
246
127
return ret;
247
128
}
248
129
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
130
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
251
131
}
252
132
253
254
/* Mark processes as completed when they exit, and save their exit
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
255
139
status. */
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
258
while(true){
259
plugin *proc = plugin_list;
260
int status;
261
pid_t pid = waitpid(-1, &status, WNOHANG);
262
if(pid == 0){
263
/* Only still running child processes */
264
break;
265
}
266
if(pid == -1){
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
270
}
271
error(0, errno, "waitpid");
272
}
273
274
/* A child exited, find it in process_list */
275
while(proc != NULL and proc->pid != pid){
276
proc = proc->next;
277
}
278
if(proc == NULL){
279
/* Process not found in process list */
280
continue;
281
}
282
proc->status = status;
283
proc->completed = 1;
284
}
285
errno = old_errno;
286
}
287
288
/* Prints out a password to stdout */
289
static bool print_out_password(const char *buffer, size_t length){
290
ssize_t ret;
291
for(size_t written = 0; written < length; written += (size_t)ret){
292
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
293
length - written));
294
if(ret < 0){
295
return false;
296
}
297
}
298
return true;
299
}
300
301
/* Removes and free a plugin from the plugin list */
302
static void free_plugin(plugin *plugin_node){
303
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
305
free(*arg);
306
}
307
free(plugin_node->argv);
308
for(char **env = plugin_node->environ; *env != NULL; env++){
309
free(*env);
310
}
311
free(plugin_node->environ);
312
free(plugin_node->buffer);
313
314
/* Removes the plugin from the singly-linked list */
315
if(plugin_node == plugin_list){
316
/* First one - simple */
317
plugin_list = plugin_list->next;
318
} else {
319
/* Second one or later */
320
for(plugin *p = plugin_list; p != NULL; p = p->next){
321
if(p->next == plugin_node){
322
p->next = plugin_node->next;
323
break;
324
}
325
}
326
}
327
328
free(plugin_node);
329
}
330
331
static void free_plugin_list(void){
332
while(plugin_list != NULL){
333
free_plugin(plugin_list);
334
}
140
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
335
153
}
336
154
337
155
int main(int argc, char *argv[]){
338
char *plugindir = NULL;
339
char *argfile = NULL;
340
FILE *conffp;
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
341
157
size_t d_name_len;
342
158
DIR *dir = NULL;
343
159
struct dirent *dirst;
344
160
struct stat st;
345
161
fd_set rfds_all;
346
162
int ret, maxfd = 0;
347
ssize_t sret;
348
163
uid_t uid = 65534;
349
164
gid_t gid = 65534;
350
165
bool debug = false;
352
167
struct sigaction old_sigchld_action;
353
168
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
354
169
.sa_flags = SA_NOCLDSTOP };
355
char **custom_argv = NULL;
356
int custom_argc = 0;
170
char *plus_options = NULL;
171
char **plus_argv = NULL;
357
172
358
173
/* Establish a signal handler */
359
174
sigemptyset(&sigchld_action.sa_mask);
360
175
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
364
goto fallback;
176
if(ret < 0){
177
perror("sigaddset");
178
exit(EXIT_FAILURE);
365
179
}
366
180
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
370
goto fallback;
181
if(ret < 0){
182
perror("sigaction");
183
exit(EXIT_FAILURE);
371
184
}
372
185
373
186
/* The options we understand. */
375
188
{ .name = "global-options", .key = 'g',
376
189
.arg = "OPTION[,OPTION[,...]]",
377
190
.doc = "Options passed to all plugins" },
378
{ .name = "global-env", .key = 'G',
379
.arg = "VAR=value",
380
.doc = "Environment variable passed to all plugins" },
381
191
{ .name = "options-for", .key = 'o',
382
192
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
383
193
.doc = "Options passed only to specified plugin" },
384
{ .name = "env-for", .key = 'E',
385
.arg = "PLUGIN:ENV=value",
386
.doc = "Environment variable passed to specified plugin" },
387
194
{ .name = "disable", .key = 'd',
388
195
.arg = "PLUGIN",
389
196
.doc = "Disable a specific plugin", .group = 1 },
390
{ .name = "enable", .key = 'e',
391
.arg = "PLUGIN",
392
.doc = "Enable a specific plugin", .group = 1 },
393
197
{ .name = "plugin-dir", .key = 128,
394
198
.arg = "DIRECTORY",
395
199
.doc = "Specify a different plugin directory", .group = 2 },
396
{ .name = "config-file", .key = 129,
397
.arg = "FILE",
398
.doc = "Specify a different configuration file", .group = 2 },
399
{ .name = "userid", .key = 130,
400
.arg = "ID", .flags = 0,
401
.doc = "User ID the plugins will run as", .group = 3 },
402
{ .name = "groupid", .key = 131,
403
.arg = "ID", .flags = 0,
404
.doc = "Group ID the plugins will run as", .group = 3 },
405
{ .name = "debug", .key = 132,
406
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.doc = "Debug mode", .group = 3 },
416
208
{ .name = NULL }
417
209
};
418
210
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
424
case 'g': /* --global-options */
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
430
}
431
}
432
}
433
break;
434
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
436
break;
437
case 'o': /* --options-for */
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
456
}
457
}
458
}
459
break;
460
case 'E': /* --env-for */
461
{
462
char *envdef = strchr(arg, ':');
463
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
break;
467
}
468
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
474
}
475
add_environment(getplugin(arg), envdef, true);
476
}
477
break;
478
case 'd': /* --disable */
479
{
480
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
483
}
484
}
485
break;
486
case 'e': /* --enable */
487
{
488
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
491
}
492
}
493
break;
494
case 128: /* --plugin-dir */
495
free(plugindir);
496
plugindir = strdup(arg);
497
break;
498
case 129: /* --config-file */
499
/* This is already done by parse_opt_config_file() */
500
break;
501
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
508
}
509
uid = (uid_t)tmpmax;
510
break;
511
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
518
}
519
gid = (gid_t)tmpmax;
520
break;
521
case 132: /* --debug */
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
212
/* Get the INPUT argument from `argp_parse', which we know is a
213
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
215
switch (key) {
216
case 'g':
217
if (arg != NULL){
218
char *p = strtok(arg, ",");
219
do{
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
222
} while (p != NULL);
223
}
224
break;
225
case 'o':
226
if (arg != NULL){
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
229
if(p != NULL){
230
p = strtok(p, ",");
231
do{
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
234
} while (p != NULL);
235
}
236
}
237
break;
238
case 'd':
239
if (arg != NULL){
240
getplugin(arg, plugins)->disabled = true;
241
}
242
break;
243
case 128:
244
plugindir = arg;
245
break;
246
case 129:
247
uid = (uid_t)strtol(arg, NULL, 10);
248
break;
249
case 130:
250
gid = (gid_t)strtol(arg, NULL, 10);
251
break;
252
case 131:
522
253
debug = true;
523
254
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
/*
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
541
*/
542
255
case ARGP_KEY_ARG:
543
/* Cryptsetup always passes an argument, which is an empty
544
string if "none" was specified in /etc/crypttab. So if
545
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
257
argp_usage (state);
548
258
}
549
default:
550
return ARGP_ERR_UNKNOWN;
551
}
552
return errno; /* Set to 0 at start */
553
}
554
555
/* This option parser is the same as parse_opt() above, except it
556
ignores everything but the --config-file option. */
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
562
case 'g': /* --global-options */
563
case 'G': /* --global-env */
564
case 'o': /* --options-for */
565
case 'E': /* --env-for */
566
case 'd': /* --disable */
567
case 'e': /* --enable */
568
case 128: /* --plugin-dir */
569
break;
570
case 129: /* --config-file */
571
free(argfile);
572
argfile = strdup(arg);
573
break;
574
case 130: /* --userid */
575
case 131: /* --groupid */
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
case ARGP_KEY_ARG:
581
break;
582
default:
583
return ARGP_ERR_UNKNOWN;
584
}
585
return errno;
586
}
587
588
struct argp argp = { .options = options,
589
.parser = parse_opt_config_file,
590
.args_doc = "",
259
plus_options = arg;
260
break;
261
case ARGP_KEY_END:
262
break;
263
default:
264
return ARGP_ERR_UNKNOWN;
265
}
266
return 0;
267
}
268
269
plugin *plugin_list = NULL;
270
271
struct argp argp = { .options = options, .parser = parse_opt,
272
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
591
273
.doc = "Mandos plugin runner -- Run plugins" };
592
274
593
/* Parse using parse_opt_config_file() in order to get the custom
594
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
609
goto fallback;
610
}
611
612
/* Reset to the normal argument parser */
613
argp.parser = parse_opt;
614
615
/* Open the configfile if available */
616
if(argfile == NULL){
617
conffp = fopen(AFILE, "r");
618
} else {
619
conffp = fopen(argfile, "r");
620
}
621
if(conffp != NULL){
622
char *org_line = NULL;
623
char *p, *arg, *new_arg, *line;
624
size_t size = 0;
625
const char whitespace_delims[] = " \r\t\f\v\n";
626
const char comment_delim[] = "#";
627
628
custom_argc = 1;
629
custom_argv = malloc(sizeof(char*) * 2);
630
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
}
635
custom_argv[0] = argv[0];
636
custom_argv[1] = NULL;
637
638
/* for each line in the config file, strip whitespace and ignore
639
commented text */
640
while(true){
641
sret = getline(&org_line, &size, conffp);
642
if(sret == -1){
643
break;
644
}
645
646
line = org_line;
647
arg = strsep(&line, comment_delim);
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
649
if(p[0] == '\0'){
650
continue;
651
}
652
new_arg = strdup(p);
653
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
656
free(org_line);
657
goto fallback;
658
}
659
660
custom_argc += 1;
661
custom_argv = realloc(custom_argv, sizeof(char *)
662
* ((unsigned int) custom_argc + 1));
663
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
666
free(org_line);
667
goto fallback;
668
}
669
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
671
}
672
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
681
free(org_line);
682
} else {
683
/* Check for harmful errors and go to fallback. Other errors might
684
not affect opening plugins */
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
688
goto fallback;
689
}
690
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
693
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
708
goto fallback;
709
}
710
}
711
712
/* Parse actual command line arguments, to let them override the
713
config file */
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
728
goto fallback;
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
276
277
if(plus_options){
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
283
char *arg;
284
int new_argc = 1;
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
287
perror("malloc");
288
exitstatus = EXIT_FAILURE;
289
goto end;
290
}
291
plus_argv[0] = argv[0];
292
plus_argv[1] = NULL;
293
arg = strtok(plus_options, delims); /* Get first argument */
294
while(arg != NULL){
295
new_argc++;
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
299
perror("malloc");
300
exitstatus = EXIT_FAILURE;
301
goto end;
302
}
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
306
}
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
729
308
}
730
309
731
310
if(debug){
735
314
for(char **a = p->argv; *a != NULL; a++){
736
315
fprintf(stderr, "\tArg: %s\n", *a);
737
316
}
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
739
for(char **a = p->environ; *a != NULL; a++){
740
fprintf(stderr, "\t%s\n", *a);
741
}
742
317
}
743
318
}
744
319
745
/* Strip permissions down to nobody */
320
ret = setuid(uid);
321
if (ret == -1){
322
perror("setuid");
323
}
324
746
325
setgid(gid);
747
if(ret == -1){
748
error(0, errno, "setgid");
749
}
750
ret = setuid(uid);
751
if(ret == -1){
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
326
if (ret == -1){
327
perror("setgid");
328
}
329
330
dir = opendir(plugindir);
331
if(dir == NULL){
332
perror("Could not open plugin dir");
333
exitstatus = EXIT_FAILURE;
334
goto end;
335
}
336
337
/* Set the FD_CLOEXEC flag on the directory, if possible */
756
338
{
757
int dir_fd = -1;
758
if(plugindir == NULL){
759
dir_fd = open(PDIR, O_RDONLY |
760
#ifdef O_CLOEXEC
761
O_CLOEXEC
762
#else /* not O_CLOEXEC */
763
0
764
#endif /* not O_CLOEXEC */
765
);
766
} else {
767
dir_fd = open(plugindir, O_RDONLY |
768
#ifdef O_CLOEXEC
769
O_CLOEXEC
770
#else /* not O_CLOEXEC */
771
0
772
#endif /* not O_CLOEXEC */
773
);
774
}
775
if(dir_fd == -1){
776
error(0, errno, "Could not open plugin dir");
777
exitstatus = EX_UNAVAILABLE;
778
goto fallback;
779
}
780
781
#ifndef O_CLOEXEC
782
/* Set the FD_CLOEXEC flag on the directory */
783
ret = set_cloexec_flag(dir_fd);
784
if(ret < 0){
785
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
exitstatus = EX_OSERR;
788
goto fallback;
789
}
790
#endif /* O_CLOEXEC */
791
792
dir = fdopendir(dir_fd);
793
if(dir == NULL){
794
error(0, errno, "Could not open plugin dir");
795
TEMP_FAILURE_RETRY(close(dir_fd));
796
exitstatus = EX_OSERR;
797
goto fallback;
339
int dir_fd = dirfd(dir);
340
if(dir_fd >= 0){
341
ret = set_cloexec_flag(dir_fd);
342
if(ret < 0){
343
perror("set_cloexec_flag");
344
exitstatus = EXIT_FAILURE;
345
goto end;
346
}
798
347
}
799
348
}
800
349
801
350
FD_ZERO(&rfds_all);
802
351
803
/* Read and execute any executable in the plugin directory*/
804
352
while(true){
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
353
dirst = readdir(dir);
808
354
809
/* All directory entries have been processed */
355
// All directory entries have been processed
810
356
if(dirst == NULL){
811
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
814
goto fallback;
815
}
816
357
break;
817
358
}
818
359
819
360
d_name_len = strlen(dirst->d_name);
820
361
821
/* Ignore dotfiles, backup files and other junk */
362
// Ignore dotfiles, backup files and other junk
822
363
{
823
364
bool bad_name = false;
824
365
826
367
827
368
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
828
369
".dpkg-old",
829
".dpkg-bak",
830
370
".dpkg-divert", NULL };
831
371
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
832
372
size_t pre_len = strlen(*pre);
840
380
break;
841
381
}
842
382
}
383
843
384
if(bad_name){
844
385
continue;
845
386
}
387
846
388
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
847
389
size_t suf_len = strlen(*suf);
848
390
if((d_name_len >= suf_len)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
391
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
850
392
== 0)){
851
393
if(debug){
852
394
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
862
404
}
863
405
}
864
406
865
char *filename;
866
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
869
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
873
}
874
if(ret < 0){
875
error(0, errno, "asprintf");
876
continue;
877
}
878
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
880
if(ret == -1){
881
error(0, errno, "stat");
882
free(filename);
883
continue;
884
}
885
886
/* Ignore non-executable files */
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
407
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
408
if (filename == NULL){
409
perror("malloc");
410
exitstatus = EXIT_FAILURE;
411
goto end;
412
}
413
strcpy(filename, plugindir); /* Spurious warning */
414
strcat(filename, "/"); /* Spurious warning */
415
strcat(filename, dirst->d_name); /* Spurious warning */
416
417
stat(filename, &st);
418
419
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
889
420
if(debug){
890
421
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
891
422
" with bad type or mode\n", filename);
893
424
free(filename);
894
425
continue;
895
426
}
896
897
plugin *p = getplugin(dirst->d_name);
898
if(p == NULL){
899
error(0, errno, "getplugin");
900
free(filename);
901
continue;
902
}
903
if(p->disabled){
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
904
428
if(debug){
905
429
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
906
430
dirst->d_name);
908
432
free(filename);
909
433
continue;
910
434
}
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
911
436
{
912
437
/* Add global arguments to argument list for this plugin */
913
plugin *g = getplugin(NULL);
914
if(g != NULL){
915
for(char **a = g->argv + 1; *a != NULL; a++){
916
if(not add_argument(p, *a)){
917
error(0, errno, "add_argument");
918
}
919
}
920
/* Add global environment variables */
921
for(char **e = g->environ; *e != NULL; e++){
922
if(not add_environment(p, *e, false)){
923
error(0, errno, "add_environment");
924
}
925
}
926
}
927
}
928
/* If this plugin has any environment variables, we will call
929
using execve and need to duplicate the environment from this
930
process, too. */
931
if(p->environ[0] != NULL){
932
for(char **e = environ; *e != NULL; e++){
933
if(not add_environment(p, *e, false)){
934
error(0, errno, "add_environment");
935
}
936
}
937
}
938
939
int pipefd[2];
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
941
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
944
goto fallback;
945
}
946
/* Ask OS to automatic close the pipe on exec */
438
plugin *g = getplugin(NULL, &plugin_list);
439
for(char **a = g->argv + 1; *a != NULL; a++){
440
addargument(p, *a);
441
}
442
}
443
int pipefd[2];
444
ret = pipe(pipefd);
445
if (ret == -1){
446
perror("pipe");
447
exitstatus = EXIT_FAILURE;
448
goto end;
449
}
947
450
ret = set_cloexec_flag(pipefd[0]);
948
451
if(ret < 0){
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
951
goto fallback;
452
perror("set_cloexec_flag");
453
exitstatus = EXIT_FAILURE;
454
goto end;
952
455
}
953
456
ret = set_cloexec_flag(pipefd[1]);
954
457
if(ret < 0){
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
957
goto fallback;
458
perror("set_cloexec_flag");
459
exitstatus = EXIT_FAILURE;
460
goto end;
958
461
}
959
462
/* Block SIGCHLD until process is safely in process list */
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
463
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
464
if(ret < 0){
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
966
goto fallback;
967
}
968
/* Starting a new process to be watched */
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
973
if(pid == -1){
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
976
goto fallback;
977
}
465
perror("sigprocmask");
466
exitstatus = EXIT_FAILURE;
467
goto end;
468
}
469
// Starting a new process to be watched
470
pid_t pid = fork();
978
471
if(pid == 0){
979
472
/* this is the child process */
980
473
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
981
474
if(ret < 0){
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
475
perror("sigaction");
476
_exit(EXIT_FAILURE);
984
477
}
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
478
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
986
479
if(ret < 0){
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
989
}
990
991
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
992
if(ret == -1){
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
995
}
480
perror("sigprocmask");
481
_exit(EXIT_FAILURE);
482
}
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
996
484
997
485
if(dirfd(dir) < 0){
998
486
/* If dir has no file descriptor, we could not set FD_CLOEXEC
999
487
above and must now close it manually here. */
1000
488
closedir(dir);
1001
489
}
1002
if(p->environ[0] == NULL){
1003
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
1006
}
1007
} else {
1008
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
1011
}
490
if(execv(filename, p->argv) < 0){
491
perror("execv");
492
_exit(EXIT_FAILURE);
1012
493
}
1013
494
/* no return */
1014
495
}
1015
/* Parent process */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
496
/* parent process */
1018
497
free(filename);
1019
plugin *new_plugin = getplugin(dirst->d_name);
1020
if(new_plugin == NULL){
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
NULL)));
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
501
perror("malloc");
502
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1025
503
if(ret < 0){
1026
error(0, errno, "sigprocmask");
504
perror("sigprocmask");
1027
505
}
1028
exitstatus = EX_OSERR;
1029
goto fallback;
506
exitstatus = EXIT_FAILURE;
507
goto end;
1030
508
}
1031
509
1032
new_plugin->pid = pid;
1033
new_plugin->fd = pipefd[0];
1034
510
*new_process = (struct process){ .pid = pid,
511
.fd = pipefd[0],
512
.next = process_list };
513
// List handling
514
process_list = new_process;
1035
515
/* Unblock SIGCHLD so signal handler can be run if this process
1036
516
has already completed */
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
517
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1040
518
if(ret < 0){
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
1043
goto fallback;
1044
}
1045
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
1048
1049
if(maxfd < new_plugin->fd){
1050
maxfd = new_plugin->fd;
1051
}
1052
}
1053
1054
TEMP_FAILURE_RETRY(closedir(dir));
519
perror("sigprocmask");
520
exitstatus = EXIT_FAILURE;
521
goto end;
522
}
523
524
FD_SET(new_process->fd, &rfds_all);
525
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
528
}
529
530
}
531
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
536
free(plugin_list);
537
}
538
539
closedir(dir);
1055
540
dir = NULL;
1056
free_plugin(getplugin(NULL));
1057
541
1058
for(plugin *p = plugin_list; p != NULL; p = p->next){
1059
if(p->pid != 0){
1060
break;
1061
}
1062
if(p->next == NULL){
1063
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1064
" directory?\n");
1065
free_plugin_list();
1066
}
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
545
goto end;
1067
546
}
1068
1069
/* Main loop while running plugins exist */
1070
while(plugin_list){
547
while(process_list){
1071
548
fd_set rfds = rfds_all;
1072
549
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1073
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
1076
goto fallback;
550
if (select_ret == -1){
551
perror("select");
552
exitstatus = EXIT_FAILURE;
553
goto end;
1077
554
}
1078
555
/* OK, now either a process completed, or something can be read
1079
556
from one of them */
1080
for(plugin *proc = plugin_list; proc != NULL;){
557
for(process *proc = process_list; proc ; proc = proc->next){
1081
558
/* Is this process completely done? */
1082
if(proc->completed and proc->eof){
559
if(proc->eof and proc->completed){
1083
560
/* Only accept the plugin output if it exited cleanly */
1084
561
if(not WIFEXITED(proc->status)
1085
562
or WEXITSTATUS(proc->status) != 0){
1086
563
/* Bad exit by plugin */
1087
1088
564
if(debug){
1089
565
if(WIFEXITED(proc->status)){
1090
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1091
" status %d\n", proc->name,
1092
(intmax_t) (proc->pid),
1093
WEXITSTATUS(proc->status));
1094
} else if(WIFSIGNALED(proc->status)){
1095
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1096
" signal %d: %s\n", proc->name,
1097
(intmax_t) (proc->pid),
1098
WTERMSIG(proc->status),
1099
strsignal(WTERMSIG(proc->status)));
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
568
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
1100
571
} else if(WCOREDUMP(proc->status)){
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
" core\n", proc->name, (intmax_t) (proc->pid));
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
1103
573
}
1104
574
}
1105
1106
575
/* Remove the plugin */
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1109
576
FD_CLR(proc->fd, &rfds_all);
1110
577
/* Block signal while modifying process_list */
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1115
579
if(ret < 0){
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
1118
goto fallback;
1119
}
1120
1121
plugin *next_plugin = proc->next;
1122
free_plugin(proc);
1123
proc = next_plugin;
1124
580
perror("sigprocmask");
581
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
588
} else {
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
591
if(p->next == proc){
592
p->next = proc->next;
593
break;
594
}
595
}
596
}
1125
597
/* We are done modifying process list, so unblock signal */
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
598
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
599
NULL);
1129
600
if(ret < 0){
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1132
goto fallback;
1133
}
1134
1135
if(plugin_list == NULL){
1136
break;
1137
}
1138
1139
continue;
601
perror("sigprocmask");
602
}
603
free(proc->buffer);
604
free(proc);
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
607
the process list */
608
break;
1140
609
}
1141
1142
610
/* This process exited nicely, so print its buffer */
1143
1144
bool bret = print_out_password(proc->buffer,
1145
proc->buffer_length);
1146
if(not bret){
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
615
proc->buffer_length
616
- written));
617
if(ret < 0){
618
perror("write");
619
exitstatus = EXIT_FAILURE;
620
goto end;
621
}
1149
622
}
1150
goto fallback;
623
goto end;
1151
624
}
1152
1153
625
/* This process has not completed. Does it have any output? */
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
626
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1157
627
/* This process had nothing to say at this time */
1158
proc = proc->next;
1159
628
continue;
1160
629
}
1161
630
/* Before reading, make the process' data buffer large enough */
1162
631
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1163
632
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
633
+ (size_t) BUFFER_SIZE);
1165
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1168
goto fallback;
634
if (proc->buffer == NULL){
635
perror("malloc");
636
exitstatus = EXIT_FAILURE;
637
goto end;
1169
638
}
1170
639
proc->buffer_size += BUFFER_SIZE;
1171
640
}
1172
641
/* Read from the process */
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1177
if(sret < 0){
642
ret = read(proc->fd, proc->buffer + proc->buffer_length,
643
BUFFER_SIZE);
644
if(ret < 0){
1178
645
/* Read error from this process; ignore the error */
1179
proc = proc->next;
1180
646
continue;
1181
647
}
1182
if(sret == 0){
648
if(ret == 0){
1183
649
/* got EOF */
1184
650
proc->eof = true;
1185
651
} else {
1186
proc->buffer_length += (size_t) sret;
652
proc->buffer_length += (size_t) ret;
1187
653
}
1188
654
}
1189
655
}
1190
1191
1192
fallback:
1193
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1196
/* Fallback if all plugins failed, none are found or an error
1197
occured */
1198
bool bret;
1199
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1200
char *passwordbuffer = getpass("Password: ");
1201
size_t len = strlen(passwordbuffer);
1202
/* Strip trailing newline */
1203
if(len > 0 and passwordbuffer[len-1] == '\n'){
1204
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1205
len--;
1206
}
1207
bret = print_out_password(passwordbuffer, len);
1208
if(not bret){
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1211
}
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
1212
659
}
1213
660
661
end:
1214
662
/* Restore old signal handler */
1215
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1216
if(ret == -1){
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1219
}
1220
1221
if(custom_argv != NULL){
1222
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1223
free(*arg);
1224
}
1225
free(custom_argv);
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
664
665
free(plus_argv);
666
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
671
free(plugin_list);
1226
672
}
1227
673
1228
674
if(dir != NULL){
1229
675
closedir(dir);
1230
676
}
1231
677
1232
/* Kill the processes */
1233
for(plugin *p = plugin_list; p != NULL; p = p->next){
1234
if(p->pid != 0){
1235
close(p->fd);
1236
ret = kill(p->pid, SIGTERM);
1237
if(ret == -1 and errno != ESRCH){
1238
/* Set-uid proccesses might not get closed */
1239
error(0, errno, "kill");
1240
}
1241
}
678
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
684
free(process_list);
1242
685
}
1243
686
1244
687
/* Wait for any remaining child processes to terminate */
1245
do {
688
do{
1246
689
ret = wait(NULL);
1247
690
} while(ret >= 0);
1248
691
if(errno != ECHILD){
1249
error(0, errno, "wait");
692
perror("wait");
1250
693
}
1251
694
1252
free_plugin_list();
1253
1254
free(plugindir);
1255
free(argfile);
1256
1257
695
return exitstatus;
1258
696
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0