summaryrefslogtreecommitdiff
path: root/utils/setauth.c
blob: a039e3c63ee5c0de7b5cc86890104d581cc5a6de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/* Change the authentication of selected processes

   Copyright (C) 1997 Free Software Foundation, Inc.

   Written by Miles Bader <miles@gnu.ai.mit.edu>

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <hurd.h>
#include <argp.h>
#include <error.h>
#include <version.h>

#include "frobauth.h"

const char *argp_program_version = STANDARD_HURD_VERSION (setauth);

#define OPT_NO_SAVE 1

static const struct argp_option options[] =
{
#ifdef SU
  {"no-save", OPT_NO_SAVE, 0, 0, "Don't save removed effective ids as available ids"},
#else
  {"save",   's', 0, 0, "Save removed effective ids as available ids"},
#endif
  {"keep",   'k', 0, 0, "Keep old ids in addition to the new ones"},
  { 0 }
};

static struct argp_child child_argps[] = {{ &frobauth_posix_argp }, { 0 }};

static char doc[] =
  "Change the authentication of selected processes";

extern error_t
get_nonsugid_ids (struct idvec *uids, struct idvec *gids);

void 
main (int argc, char *argv[])
{
  error_t err;
  auth_t auth;			/* Authority to make changes.  */
  int save = 0, keep = 0;
  struct idvec have_uids = IDVEC_INIT, have_gids = IDVEC_INIT;
  struct frobauth frobauth = FROBAUTH_INIT;

  error_t parse_opt (int key, char *arg, struct argp_state *state)
    {
      switch (key)
	{
	case 's': save = 1; break;
	case 'k': keep = 1; break;
	case OPT_NO_SAVE: save = 0; break;
	case ARGP_KEY_INIT:
	  state->child_inputs[0] = state->input; break;
	default:
	  return ARGP_ERR_UNKNOWN;
	}
      return 0;
    }
  /* Modify UGIDS, to be what PID's new authentication should be, UGIDS is
     what the user specified.  */
  error_t modify (struct ugids *ugids, const struct ugids *new,
		  pid_t pid, void *hook)
    {
      struct ugids old = UGIDS_INIT;
      ugids_set (&old, ugids);

      ugids_set (ugids, new);

      if (keep)
	ugids_merge (ugids, &old);
      if (save)
	{
	  ugids_save (&old);
	  ugids_merge (ugids, &old);
	}

      return 0;
    }
  void print_info (const struct ugids *new,
		   const struct ugids *old,
		   const struct ugids *user,
		   pid_t pid, void *hook)
    {
      char *new_rep = ugids_rep (new, 1, 1, 0, 0, 0);
      printf ("%d: Changed auth to %s\n", pid, new_rep);
      free (new_rep);
    }
  struct argp argp = { options, parse_opt, 0, doc, child_argps };

#ifdef SU
  frobauth.default_user = 0;
  save = 1;			/* Default to saving ids */
#endif

  /* Parse our command line.  This shouldn't ever return an error.  */
  argp_parse (&argp, argc, argv, 0, 0, &frobauth);

  /* See what the invoking user is authorized to do.  */
  err = get_nonsugid_ids (&have_uids, &have_gids);
  if (err)
    error (52, err, "Cannot get invoking authentication");

  /* Check passwords.  */
  err = ugids_verify_make_auth (&frobauth.ugids, &have_uids, &have_gids, 0, 0,
				0, 0, &auth);
  if (err == EACCES)
    error (15, 0, "Invalid password");
  else if (err)
    error (16, err, "Authentication failure");

  if (frobauth_modify (&frobauth, &auth, 1, modify, print_info, 0))
    exit (0);
  else
    exit (1);
}