/mandos/trunk

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/trunk
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
1
/*  -*- coding: utf-8 -*- */
2
/*
3
 * Mandos plugin runner - Run Mandos plugins
4
 *
28 by Teddy Hogeborn
* server.conf: New file.
5
 * Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
6
 * 
7
 * This program is free software: you can redistribute it and/or
8
 * modify it under the terms of the GNU General Public License as
9
 * published by the Free Software Foundation, either version 3 of the
10
 * License, or (at your option) any later version.
11
 * 
12
 * This program is distributed in the hope that it will be useful, but
13
 * WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * General Public License for more details.
16
 * 
17
 * You should have received a copy of the GNU General Public License
18
 * along with this program.  If not, see
19
 * <http://www.gnu.org/licenses/>.
20
 * 
28 by Teddy Hogeborn
* server.conf: New file.
21
 * Contact the authors at <mandos@fukt.bsnet.se>.
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
22
 */
23
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
24
#define _GNU_SOURCE		/* TEMP_FAILURE_RETRY() */
25
24.1.26 by Björn Påhlsson
tally count of used symbols
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() */
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
42
#include <iso646.h>		/* and, or, not */
43
#include <dirent.h>		/* DIR, struct dirent, opendir(),
24.1.26 by Björn Påhlsson
tally count of used symbols
44
				   readdir(), closedir(), dirfd() */
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
45
#include <unistd.h>		/* struct stat, stat(), S_ISREG(),
24.1.26 by Björn Påhlsson
tally count of used symbols
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>		/* strtok, strlen(), strcpy(),
55
				   strcat() */
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
56
#include <errno.h>		/* errno */
24.1.26 by Björn Påhlsson
tally count of used symbols
57
#include <argp.h>		/* struct argp_option, struct
58
				   argp_state, struct argp,
59
				   argp_parse(), ARGP_ERR_UNKNOWN,
60
				   ARGP_KEY_END, ARGP_KEY_ARG, 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 */
13 by Björn Påhlsson
Added following support:
66
37 by Teddy Hogeborn
Non-tested commit for merge purposes.
67
#define BUFFER_SIZE 256
68
74 by Teddy Hogeborn
* Makefile (PREFIX, CONFDIR): New.
69
const char *argp_program_version = "plugin-runner 1.0";
24.1.35 by Björn Påhlsson
version 1.0
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
13 by Björn Påhlsson
Added following support:
72
struct process;
73
74
typedef struct process{
75
  pid_t pid;
76
  int fd;
77
  char *buffer;
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
78
  size_t buffer_size;
79
  size_t buffer_length;
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
80
  bool eof;
81
  bool completed;
82
  int status;
13 by Björn Påhlsson
Added following support:
83
  struct process *next;
84
} process;
85
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
86
typedef struct plugin{
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
87
  char *name;			/* can be NULL or any plugin name */
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
88
  char **argv;
89
  int argc;
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
90
  bool disabled;
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
91
  struct plugin *next;
92
} plugin;
93
37 by Teddy Hogeborn
Non-tested commit for merge purposes.
94
static plugin *getplugin(char *name, plugin **plugin_list){
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
95
  for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
    if ((p->name == name)
97
	or (p->name and name and (strcmp(p->name, name) == 0))){
98
      return p;
99
    }
100
  }
101
  /* Create a new plugin */
102
  plugin *new_plugin = malloc(sizeof(plugin));
103
  if (new_plugin == NULL){
104
    perror("malloc");
105
    exit(EXIT_FAILURE);
106
  }
107
  new_plugin->name = name;
108
  new_plugin->argv = malloc(sizeof(char *) * 2);
109
  if (new_plugin->argv == NULL){
110
    perror("malloc");
111
    exit(EXIT_FAILURE);
112
  }
113
  new_plugin->argv[0] = name;
114
  new_plugin->argv[1] = NULL;
115
  new_plugin->argc = 1;
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
116
  new_plugin->disabled = false;
24.1.5 by Björn Påhlsson
plugbasedclient:
117
  new_plugin->next = *plugin_list;
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
118
  /* Append the new plugin to the list */
119
  *plugin_list = new_plugin;
120
  return new_plugin;
121
}
122
37 by Teddy Hogeborn
Non-tested commit for merge purposes.
123
static void addargument(plugin *p, char *arg){
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
124
  p->argv[p->argc] = arg;
125
  p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
  if (p->argv == NULL){
127
    perror("malloc");
128
    exit(EXIT_FAILURE);
129
  }
130
  p->argc++;
131
  p->argv[p->argc] = NULL;
132
}
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
133
32 by Teddy Hogeborn
* plugins.d/plugbasedclient.c (set_cloexec_flag): New function.
134
/*
135
 * Based on the example in the GNU LibC manual chapter 13.13 "File
136
 * Descriptor Flags".
137
 * *Note File Descriptor Flags:(libc)Descriptor Flags.
138
 */
37 by Teddy Hogeborn
Non-tested commit for merge purposes.
139
static int set_cloexec_flag(int fd)
32 by Teddy Hogeborn
* plugins.d/plugbasedclient.c (set_cloexec_flag): New function.
140
{
141
  int ret = fcntl(fd, F_GETFD, 0);
142
  /* If reading the flags failed, return error indication now. */
143
  if(ret < 0){
144
    return ret;
145
  }
146
  /* Store modified flag word in the descriptor. */
147
  return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
}
149
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
150
process *process_list = NULL;
151
152
/* Mark a process as completed when it exits, and save its exit
153
   status. */
154
void handle_sigchld(__attribute__((unused)) int sig){
155
  process *proc = process_list;
156
  int status;
157
  pid_t pid = wait(&status);
24.1.26 by Björn Påhlsson
tally count of used symbols
158
  if(pid == -1){
159
    perror("wait");
160
    return;
161
  }
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
162
  while(proc != NULL and proc->pid != pid){
24.1.8 by Björn Påhlsson
plugbasedclient
163
    proc = proc->next;
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
164
  }
165
  if(proc == NULL){
166
    /* Process not found in process list */
167
    return;
168
  }
169
  proc->status = status;
170
  proc->completed = true;
171
}
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
172
24.1.42 by Björn Påhlsson
Added fallback to mandos-client
173
bool print_out_password(const char *buffer, size_t length){
64 by Teddy Hogeborn
* mandos-client.c (print_out_password): Strip trailing '\n'.
174
  ssize_t ret;
175
  if(length>0 and buffer[length-1] == '\n'){
176
    length--;
177
  }
178
  for(size_t written = 0; written < length; written += (size_t)ret){
24.1.42 by Björn Påhlsson
Added fallback to mandos-client
179
    ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
				   length - written));
181
    if(ret < 0){
182
      return false;
183
    }
184
  }
185
  return true;
186
}
187
13 by Björn Påhlsson
Added following support:
188
int main(int argc, char *argv[]){
74 by Teddy Hogeborn
* Makefile (PREFIX, CONFDIR): New.
189
  const char *plugindir = "/lib/mandos/plugins.d";
24.1.5 by Björn Påhlsson
plugbasedclient:
190
  size_t d_name_len;
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
191
  DIR *dir = NULL;
13 by Björn Påhlsson
Added following support:
192
  struct dirent *dirst;
193
  struct stat st;
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
194
  fd_set rfds_all;
13 by Björn Påhlsson
Added following support:
195
  int ret, maxfd = 0;
24.1.6 by Björn Påhlsson
plugbasedclient
196
  uid_t uid = 65534;
197
  gid_t gid = 65534;
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
198
  bool debug = false;
199
  int exitstatus = EXIT_SUCCESS;
24.1.7 by Björn Påhlsson
merge
200
  struct sigaction old_sigchld_action;
201
  struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
				      .sa_flags = SA_NOCLDSTOP };
24.1.8 by Björn Påhlsson
plugbasedclient
203
  char *plus_options = NULL;
204
  char **plus_argv = NULL;
24.1.45 by Björn Påhlsson
Fixed fallback on error in mandos-client
205
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
206
  /* Establish a signal handler */
207
  sigemptyset(&sigchld_action.sa_mask);
208
  ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
  if(ret < 0){
210
    perror("sigaddset");
211
    exit(EXIT_FAILURE);
212
  }
213
  ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
  if(ret < 0){
215
    perror("sigaction");
216
    exit(EXIT_FAILURE);
217
  }
218
  
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
219
  /* The options we understand. */
220
  struct argp_option options[] = {
221
    { .name = "global-options", .key = 'g',
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
222
      .arg = "OPTION[,OPTION[,...]]",
223
      .doc = "Options passed to all plugins" },
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
224
    { .name = "options-for", .key = 'o',
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
225
      .arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
      .doc = "Options passed only to specified plugin" },
227
    { .name = "disable", .key = 'd',
228
      .arg = "PLUGIN",
229
      .doc = "Disable a specific plugin", .group = 1 },
24.1.5 by Björn Påhlsson
plugbasedclient:
230
    { .name = "plugin-dir", .key = 128,
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
231
      .arg = "DIRECTORY",
232
      .doc = "Specify a different plugin directory", .group = 2 },
24.1.6 by Björn Påhlsson
plugbasedclient
233
    { .name = "userid", .key = 129,
24.1.7 by Björn Påhlsson
merge
234
      .arg = "ID", .flags = 0,
235
      .doc = "User ID the plugins will run as", .group = 2 },
24.1.6 by Björn Påhlsson
plugbasedclient
236
    { .name = "groupid", .key = 130,
24.1.7 by Björn Påhlsson
merge
237
      .arg = "ID", .flags = 0,
238
      .doc = "Group ID the plugins will run as", .group = 2 },
239
    { .name = "debug", .key = 131,
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
240
      .doc = "Debug mode", .group = 3 },
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
241
    { .name = NULL }
242
  };
243
  
244
  error_t parse_opt (int key, char *arg, struct argp_state *state) {
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
245
    /* Get the INPUT argument from `argp_parse', which we know is a
246
       pointer to our plugin list pointer. */
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
247
    plugin **plugins = state->input;
248
    switch (key) {
249
    case 'g':
250
      if (arg != NULL){
251
	char *p = strtok(arg, ",");
252
	do{
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
253
	  addargument(getplugin(NULL, plugins), p);
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
254
	  p = strtok(NULL, ",");
24.1.8 by Björn Påhlsson
plugbasedclient
255
	} while (p != NULL);
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
256
      }
257
      break;
258
    case 'o':
259
      if (arg != NULL){
260
	char *name = strtok(arg, ":");
261
	char *p = strtok(NULL, ":");
24.1.8 by Björn Påhlsson
plugbasedclient
262
	if(p != NULL){
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
263
	  p = strtok(p, ",");
264
	  do{
265
	    addargument(getplugin(name, plugins), p);
266
	    p = strtok(NULL, ",");
24.1.8 by Björn Påhlsson
plugbasedclient
267
	  } while (p != NULL);
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
268
	}
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
269
      }
270
      break;
24.1.5 by Björn Påhlsson
plugbasedclient:
271
    case 'd':
272
      if (arg != NULL){
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
273
	getplugin(arg, plugins)->disabled = true;
24.1.5 by Björn Påhlsson
plugbasedclient:
274
      }
275
      break;
276
    case 128:
277
      plugindir = arg;
278
      break;
24.1.6 by Björn Påhlsson
plugbasedclient
279
    case 129:
280
      uid = (uid_t)strtol(arg, NULL, 10);
281
      break;
282
    case 130:
283
      gid = (gid_t)strtol(arg, NULL, 10);
284
      break;
24.1.7 by Björn Påhlsson
merge
285
    case 131:
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
286
      debug = true;
287
      break;
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
288
    case ARGP_KEY_ARG:
24.1.8 by Björn Påhlsson
plugbasedclient
289
      if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
	argp_usage (state);
291
      }
292
      plus_options = arg;
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
293
      break;
294
    case ARGP_KEY_END:
295
      break;
296
    default:
297
      return ARGP_ERR_UNKNOWN;
298
    }
299
    return 0;
300
  }
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
301
  
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
302
  plugin *plugin_list = NULL;
303
  
304
  struct argp argp = { .options = options, .parser = parse_opt,
24.1.8 by Björn Påhlsson
plugbasedclient
305
		       .args_doc = "[+PLUS_SEPARATED_OPTIONS]",
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
306
		       .doc = "Mandos plugin runner -- Run plugins" };
307
  
24.1.26 by Björn Påhlsson
tally count of used symbols
308
  ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
309
  if (ret == ARGP_ERR_UNKNOWN){
64 by Teddy Hogeborn
* mandos-client.c (print_out_password): Strip trailing '\n'.
310
    fprintf(stderr, "Unknown error while parsing arguments\n");
24.1.26 by Björn Påhlsson
tally count of used symbols
311
    exitstatus = EXIT_FAILURE;
312
    goto end;
313
  }
24.1.8 by Björn Påhlsson
plugbasedclient
314
  
315
  if(plus_options){
316
    /* This is a mangled argument in the form of
317
     "+--option+--other-option=parameter+--yet-another-option", etc */
318
    /* Make new argc and argv vars, and call argp_parse() again. */
319
    plus_options++;		/* skip the first '+' character */
320
    const char delims[] = "+";
321
    char *arg;
322
    int new_argc = 1;
323
    plus_argv = malloc(sizeof(char*) * 2);
324
    if(plus_argv == NULL){
325
      perror("malloc");
326
      exitstatus = EXIT_FAILURE;
327
      goto end;
328
    }
329
    plus_argv[0] = argv[0];
330
    plus_argv[1] = NULL;
331
    arg = strtok(plus_options, delims); /* Get first argument */
332
    while(arg != NULL){
333
      new_argc++;
334
      plus_argv = realloc(plus_argv, sizeof(char *)
335
			 * ((unsigned int) new_argc + 1));
336
      if(plus_argv == NULL){
24.1.26 by Björn Påhlsson
tally count of used symbols
337
	perror("realloc");
24.1.8 by Björn Påhlsson
plugbasedclient
338
	exitstatus = EXIT_FAILURE;
339
	goto end;
340
      }
341
      plus_argv[new_argc-1] = arg;
342
      plus_argv[new_argc] = NULL;
343
      arg = strtok(NULL, delims); /* Get next argument */
344
    }
24.1.26 by Björn Påhlsson
tally count of used symbols
345
    ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
346
    if (ret == ARGP_ERR_UNKNOWN){
64 by Teddy Hogeborn
* mandos-client.c (print_out_password): Strip trailing '\n'.
347
      fprintf(stderr, "Unknown error while parsing arguments\n");
24.1.26 by Björn Påhlsson
tally count of used symbols
348
      exitstatus = EXIT_FAILURE;
349
      goto end;
350
    }
24.1.8 by Björn Påhlsson
plugbasedclient
351
  }
352
  
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
353
  if(debug){
354
    for(plugin *p = plugin_list; p != NULL; p=p->next){
355
      fprintf(stderr, "Plugin: %s has %d arguments\n",
32 by Teddy Hogeborn
* plugins.d/plugbasedclient.c (set_cloexec_flag): New function.
356
	      p->name ? p->name : "Global", p->argc - 1);
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
357
      for(char **a = p->argv; *a != NULL; a++){
358
	fprintf(stderr, "\tArg: %s\n", *a);
359
      }
360
    }
361
  }
24.1.8 by Björn Påhlsson
plugbasedclient
362
  
24.1.6 by Björn Påhlsson
plugbasedclient
363
  ret = setuid(uid);
364
  if (ret == -1){
365
    perror("setuid");
366
  }
24.1.7 by Björn Påhlsson
merge
367
  
24.1.6 by Björn Påhlsson
plugbasedclient
368
  setgid(gid);
369
  if (ret == -1){
39 by Teddy Hogeborn
* plugins.d/mandosclient.c (pgp_packet_decrypt): Renamed variables.
370
    perror("setgid");
24.1.6 by Björn Påhlsson
plugbasedclient
371
  }
372
  
13 by Björn Påhlsson
Added following support:
373
  dir = opendir(plugindir);
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
374
  if(dir == NULL){
375
    perror("Could not open plugin dir");
376
    exitstatus = EXIT_FAILURE;
32 by Teddy Hogeborn
* plugins.d/plugbasedclient.c (set_cloexec_flag): New function.
377
    goto end;
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
378
  }
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
379
  
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
380
  /* Set the FD_CLOEXEC flag on the directory, if possible */
381
  {
382
    int dir_fd = dirfd(dir);
383
    if(dir_fd >= 0){
384
      ret = set_cloexec_flag(dir_fd);
385
      if(ret < 0){
386
	perror("set_cloexec_flag");
387
	exitstatus = EXIT_FAILURE;
388
	goto end;
389
      }
390
    }
391
  }
24.1.1 by Björn Påhlsson
Added syntax and support for plugbasedclient arguments and how they
392
  
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
393
  FD_ZERO(&rfds_all);
13 by Björn Påhlsson
Added following support:
394
  
395
  while(true){
396
    dirst = readdir(dir);
397
    
398
    // All directory entries have been processed
399
    if(dirst == NULL){
24.1.26 by Björn Påhlsson
tally count of used symbols
400
      if (errno == EBADF){
401
	perror("readdir");
402
	exitstatus = EXIT_FAILURE;
403
	goto end;
404
      }
13 by Björn Påhlsson
Added following support:
405
      break;
406
    }
407
    
408
    d_name_len = strlen(dirst->d_name);
409
    
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
410
    // Ignore dotfiles, backup files and other junk
411
    {
412
      bool bad_name = false;
413
      
414
      const char const *bad_prefixes[] = { ".", "#", NULL };
415
      
416
      const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
417
					   ".dpkg-old",
418
					   ".dpkg-divert", NULL };
419
      for(const char **pre = bad_prefixes; *pre != NULL; pre++){
420
	size_t pre_len = strlen(*pre);
421
	if((d_name_len >= pre_len)
422
	   and strncmp((dirst->d_name), *pre, pre_len) == 0){
423
	  if(debug){
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
424
	    fprintf(stderr, "Ignoring plugin dir entry \"%s\""
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
425
		    " with bad prefix %s\n", dirst->d_name, *pre);
426
	  }
427
	  bad_name = true;
428
	  break;
429
	}
430
      }
431
      
432
      if(bad_name){
433
	continue;
434
      }
435
      
436
      for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
	size_t suf_len = strlen(*suf);
438
	if((d_name_len >= suf_len)
439
	   and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
440
		== 0)){
441
	  if(debug){
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
442
	    fprintf(stderr, "Ignoring plugin dir entry \"%s\""
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
443
		    " with bad suffix %s\n", dirst->d_name, *suf);
444
	  }
445
	  bad_name = true;
446
	  break;
447
	}
448
      }
449
      
450
      if(bad_name){
451
	continue;
452
      }
13 by Björn Påhlsson
Added following support:
453
    }
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
454
    
24.1.5 by Björn Påhlsson
plugbasedclient:
455
    char *filename = malloc(d_name_len + strlen(plugindir) + 2);
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
456
    if (filename == NULL){
457
      perror("malloc");
24.1.46 by Björn Påhlsson
mandos-client
458
      continue;
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
459
    }
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
460
    strcpy(filename, plugindir); /* Spurious warning */
461
    strcat(filename, "/");	/* Spurious warning */
462
    strcat(filename, dirst->d_name); /* Spurious warning */
463
    
24.1.26 by Björn Påhlsson
tally count of used symbols
464
    ret = stat(filename, &st);
465
    if (ret == -1){
466
      perror("stat");
24.1.46 by Björn Påhlsson
mandos-client
467
      free(filename);
468
      continue;
24.1.26 by Björn Påhlsson
tally count of used symbols
469
    }
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
470
    
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
471
    if (not S_ISREG(st.st_mode)	or (access(filename, X_OK) != 0)){
472
      if(debug){
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
473
	fprintf(stderr, "Ignoring plugin dir entry \"%s\""
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
474
		" with bad type or mode\n", filename);
475
      }
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
476
      free(filename);
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
477
      continue;
478
    }
479
    if(getplugin(dirst->d_name, &plugin_list)->disabled){
480
      if(debug){
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
481
	fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
482
		dirst->d_name);
483
      }
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
484
      free(filename);
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
485
      continue;
486
    }
32 by Teddy Hogeborn
* plugins.d/plugbasedclient.c (set_cloexec_flag): New function.
487
    plugin *p = getplugin(dirst->d_name, &plugin_list);
488
    {
489
      /* Add global arguments to argument list for this plugin */
490
      plugin *g = getplugin(NULL, &plugin_list);
491
      for(char **a = g->argv + 1; *a != NULL; a++){
492
	addargument(p, *a);
493
      }
494
    }
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
495
    int pipefd[2]; 
496
    ret = pipe(pipefd);
497
    if (ret == -1){
498
      perror("pipe");
499
      exitstatus = EXIT_FAILURE;
500
      goto end;
501
    }
502
    ret = set_cloexec_flag(pipefd[0]);
503
    if(ret < 0){
504
      perror("set_cloexec_flag");
505
      exitstatus = EXIT_FAILURE;
506
      goto end;
507
    }
508
    ret = set_cloexec_flag(pipefd[1]);
509
    if(ret < 0){
510
      perror("set_cloexec_flag");
511
      exitstatus = EXIT_FAILURE;
512
      goto end;
513
    }
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
514
    /* Block SIGCHLD until process is safely in process list */
515
    ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
516
    if(ret < 0){
517
      perror("sigprocmask");
518
      exitstatus = EXIT_FAILURE;
519
      goto end;
520
    }
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
521
    // Starting a new process to be watched
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
522
    pid_t pid = fork();
24.1.46 by Björn Påhlsson
mandos-client
523
    if(pid == -1){
524
      perror("fork");
525
      exitstatus = EXIT_FAILURE;
526
      goto end;
527
    }
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
528
    if(pid == 0){
529
      /* this is the child process */
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
530
      ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
531
      if(ret < 0){
532
	perror("sigaction");
533
	_exit(EXIT_FAILURE);
534
      }
535
      ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
536
      if(ret < 0){
537
	perror("sigprocmask");
538
	_exit(EXIT_FAILURE);
539
      }
24.1.26 by Björn Påhlsson
tally count of used symbols
540
541
      ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
542
      if(ret == -1){
543
	perror("dup2");
544
	_exit(EXIT_FAILURE);
545
      }
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
546
      
547
      if(dirfd(dir) < 0){
548
	/* If dir has no file descriptor, we could not set FD_CLOEXEC
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
549
	   above and must now close it manually here. */
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
550
	closedir(dir);
33 by Teddy Hogeborn
* plugins.d/plugbasedclient.c (main): Close the pipe fd after dup2:ing
551
      }
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
552
      if(execv(filename, p->argv) < 0){
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
553
	perror("execv");
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
554
	_exit(EXIT_FAILURE);
555
      }
556
      /* no return */
557
    }
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
558
    /* parent process */
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
559
    free(filename);
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
560
    close(pipefd[1]);		/* close unused write end of pipe */
561
    process *new_process = malloc(sizeof(process));
562
    if (new_process == NULL){
563
      perror("malloc");
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
564
      ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
565
      if(ret < 0){
566
	perror("sigprocmask");
567
      }
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
568
      exitstatus = EXIT_FAILURE;
569
      goto end;
570
    }
571
    
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
572
    *new_process = (struct process){ .pid = pid,
573
				     .fd = pipefd[0],
574
				     .next = process_list };
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
575
    // List handling
576
    process_list = new_process;
577
    /* Unblock SIGCHLD so signal handler can be run if this process
578
       has already completed */
579
    ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
    if(ret < 0){
581
      perror("sigprocmask");
582
      exitstatus = EXIT_FAILURE;
583
      goto end;
584
    }
585
    
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
586
    FD_SET(new_process->fd, &rfds_all);
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
587
    
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
588
    if (maxfd < new_process->fd){
589
      maxfd = new_process->fd;
590
    }
591
    
13 by Björn Påhlsson
Added following support:
592
  }
593
  
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
594
  /* Free the plugin list */
595
  for(plugin *next; plugin_list != NULL; plugin_list = next){
596
    next = plugin_list->next;
597
    free(plugin_list->argv);
598
    free(plugin_list);
599
  }
600
  
13 by Björn Påhlsson
Added following support:
601
  closedir(dir);
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
602
  dir = NULL;
24.1.26 by Björn Påhlsson
tally count of used symbols
603
    
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
604
  if (process_list == NULL){
24.1.42 by Björn Påhlsson
Added fallback to mandos-client
605
    fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
	    " directory?\n");
607
    process_list = NULL;
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
608
  }
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
609
  while(process_list){
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
610
    fd_set rfds = rfds_all;
611
    int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
612
    if (select_ret == -1){
613
      perror("select");
614
      exitstatus = EXIT_FAILURE;
615
      goto end;
616
    }
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
617
    /* OK, now either a process completed, or something can be read
618
       from one of them */
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
619
    for(process *proc = process_list; proc ; proc = proc->next){
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
620
      /* Is this process completely done? */
621
      if(proc->eof and proc->completed){
622
	/* Only accept the plugin output if it exited cleanly */
623
	if(not WIFEXITED(proc->status)
624
	   or WEXITSTATUS(proc->status) != 0){
625
	  /* Bad exit by plugin */
626
	  if(debug){
627
	    if(WIFEXITED(proc->status)){
60 by Teddy Hogeborn
* mandos-client.c (main): Cast pid_t to unsigned int before printing.
628
	      fprintf(stderr, "Plugin %u exited with status %d\n",
629
		      (unsigned int) (proc->pid),
630
		      WEXITSTATUS(proc->status));
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
631
	    } else if(WIFSIGNALED(proc->status)) {
60 by Teddy Hogeborn
* mandos-client.c (main): Cast pid_t to unsigned int before printing.
632
	      fprintf(stderr, "Plugin %u killed by signal %d\n",
633
		      (unsigned int) (proc->pid),
634
		      WTERMSIG(proc->status));
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
635
	    } else if(WCOREDUMP(proc->status)){
60 by Teddy Hogeborn
* mandos-client.c (main): Cast pid_t to unsigned int before printing.
636
	      fprintf(stderr, "Plugin %d dumped core\n",
637
		      (unsigned int) (proc->pid));
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
638
	    }
639
	  }
640
	  /* Remove the plugin */
641
	  FD_CLR(proc->fd, &rfds_all);
642
	  /* Block signal while modifying process_list */
643
	  ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
644
	  if(ret < 0){
645
	    perror("sigprocmask");
646
	    exitstatus = EXIT_FAILURE;
647
	    goto end;
648
	  }
649
	  /* Delete this process entry from the list */
650
	  if(process_list == proc){
651
	    /* First one - simple */
652
	    process_list = proc->next;
653
	  } else {
654
	    /* Second one or later */
655
	    for(process *p = process_list; p != NULL; p = p->next){
656
	      if(p->next == proc){
657
		p->next = proc->next;
658
		break;
659
	      }
660
	    }
661
	  }
662
	  /* We are done modifying process list, so unblock signal */
663
	  ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
664
			     NULL);
665
	  if(ret < 0){
666
	    perror("sigprocmask");
667
	  }
668
	  free(proc->buffer);
669
	  free(proc);
670
	  /* We deleted this process from the list, so we can't go
671
	     proc->next.  Therefore, start over from the beginning of
672
	     the process list */
673
	  break;
674
	}
675
	/* This process exited nicely, so print its buffer */
24.1.42 by Björn Påhlsson
Added fallback to mandos-client
676
677
	bool bret = print_out_password(proc->buffer, proc->buffer_length);
678
	if(not bret){
679
	  perror("print_out_password");
680
	  exitstatus = EXIT_FAILURE;
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
681
	}
682
	goto end;
683
      }
684
      /* This process has not completed.  Does it have any output? */
685
      if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
686
	/* This process had nothing to say at this time */
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
687
	continue;
688
      }
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
689
      /* Before reading, make the process' data buffer large enough */
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
690
      if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
691
	proc->buffer = realloc(proc->buffer, proc->buffer_size
692
			       + (size_t) BUFFER_SIZE);
693
	if (proc->buffer == NULL){
694
	  perror("malloc");
695
	  exitstatus = EXIT_FAILURE;
696
	  goto end;
697
	}
698
	proc->buffer_size += BUFFER_SIZE;
699
      }
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
700
      /* Read from the process */
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
701
      ret = read(proc->fd, proc->buffer + proc->buffer_length,
702
		 BUFFER_SIZE);
703
      if(ret < 0){
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
704
	/* Read error from this process; ignore the error */
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
705
	continue;
706
      }
707
      if(ret == 0){
708
	/* got EOF */
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
709
	proc->eof = true;
710
      } else {
711
	proc->buffer_length += (size_t) ret;
13 by Björn Påhlsson
Added following support:
712
      }
713
    }
714
  }
24.1.45 by Björn Påhlsson
Fixed fallback on error in mandos-client
715
716
717
 end:
24.1.42 by Björn Påhlsson
Added fallback to mandos-client
718
  
24.1.45 by Björn Påhlsson
Fixed fallback on error in mandos-client
719
  if(process_list == NULL or exitstatus != EXIT_SUCCESS){
24.1.46 by Björn Påhlsson
mandos-client
720
    /* Fallback if all plugins failed, none are found or an error occured */
24.1.42 by Björn Påhlsson
Added fallback to mandos-client
721
    bool bret;
722
    fprintf(stderr, "Going to fallback mode using getpass(3)\n");
723
    char *passwordbuffer = getpass("Password: ");
724
    bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
725
    if(not bret){
726
      perror("print_out_password");
727
      exitstatus = EXIT_FAILURE;
728
      goto end;
729
    }
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
730
  }
24.1.42 by Björn Påhlsson
Added fallback to mandos-client
731
  
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
732
  /* Restore old signal handler */
733
  sigaction(SIGCHLD, &old_sigchld_action, NULL);
734
  
24.1.8 by Björn Påhlsson
plugbasedclient
735
  free(plus_argv);
736
  
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
737
  /* Free the plugin list */
738
  for(plugin *next; plugin_list != NULL; plugin_list = next){
739
    next = plugin_list->next;
740
    free(plugin_list->argv);
741
    free(plugin_list);
742
  }
743
  
744
  if(dir != NULL){
745
    closedir(dir);
746
  }
747
  
748
  /* Free the process list and kill the processes */
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
749
  for(process *next; process_list != NULL; process_list = next){
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
750
    next = process_list->next;
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
751
    close(process_list->fd);
24.1.26 by Björn Påhlsson
tally count of used symbols
752
    ret = kill(process_list->pid, SIGTERM);
753
    if(ret == -1 and errno != ESRCH){
754
      /* set-uid proccesses migth not get closed */
755
      perror("kill");
756
    }
34 by Teddy Hogeborn
* plugbasedclient.c (main): Check if plugin dir could be opened. Set
757
    free(process_list->buffer);
758
    free(process_list);
13 by Björn Påhlsson
Added following support:
759
  }
760
  
35 by Teddy Hogeborn
* plugbasedclient.c (struct process): New fields "eof", "completed",
761
  /* Wait for any remaining child processes to terminate */
762
  do{
763
    ret = wait(NULL);
764
  } while(ret >= 0);
765
  if(errno != ECHILD){
766
    perror("wait");
767
  }
768
  
31 by Teddy Hogeborn
* plugins.d/plugbasedclient.c: Update include file comments.
769
  return exitstatus;
13 by Björn Påhlsson
Added following support:
770
}