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
135
136
137
138
139
140
141
142
|
/**
* cerberus – Minimal login program
*
* Copyright © 2013 Mattias Andrée (maandree@member.fsf.org)
*
* 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
*/
#include "cerberus.h"
/* The number of seconds before the program times out */
#ifndef TIMEOUT_SECONDS
#define TIMEOUT_SECONDS 60
#endif
/* Free if declared */
#define xfree(VAR) ({ if (VAR) free(VAR); })
/**
* Mane method
*
* @param argc The number of command line arguments
* @param argv The command line arguments
* @return Return code
*/
int main(int argc, char** argv)
{
char* username = NULL;
char* hostname = NULL;
char* passphrase = NULL;
char preserve_env = 0;
char skip_auth = 0;
/* Disable echoing */
disable_echo();
/* This should be done as early and quickly as possible so as little
as possible of the passphrase gets leaked to the output if the user
begins entering the passphrase directly after the username. */
/* Set proccess group ID */
setpgrp();
/* Parse command line arguments */
{
char double_dashed = 0;
char hostname_on_next = 0;
int i;
for (i = 1; i < argc; i++)
{
char *arg = *(argv + i);
char c;
if (*arg == 0)
;
else if ((*arg == '-') && (double_dashed == 0))
while ((c = *(++arg)))
if ((c == 'V') || (c == 'H'))
;
else if (c == 'p')
preserve_env = 1;
else if (c == 'h')
{
if (*(arg + 1))
hostname = arg + 1;
else
hostname_on_next = 1;
break;
}
else if (c == 'f')
{
if (*(arg + 1))
username = arg + 1;
skip_auth = 1;
break;
}
else if (c == '-')
{
double_dashed = 1;
break;
}
else
fprintf(stderr, "%s: unrecognised options: -%c\n", *argv, c);
else if (hostname_on_next)
{
hostname = arg;
hostname_on_next = 0;
}
else
username = arg;
}
}
/* Print ant we want a passphrase, if -f has not been used */
if (skip_auth == 0)
{
printf("Passphrase: ");
fflush(stdout);
}
/* Done early to make to program look like it is even faster than it is */
/* Set up clean quiting and time out */
signal(SIGALRM, timeout_quit);
signal(SIGQUIT, user_quit);
signal(SIGINT, user_quit);
siginterrupt(SIGALM, 1);
siginterrupt(SIGQUIT, 1);
siginterrupt(SIGINT, 1);
alarm(TIMEOUT_SECONDS);
/* Get the passphrase, if -f has not been used */
if (skip_auth == 0)
{
passphrase = get_passphrase();
printf("\n");
}
/* Reset terminal settings */
reenable_echo();
xfree(passphrase);
return 0;
}
|
