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
|
/*
* Copyright (c) 2012,2023 Damien Miller <djm@mindrot.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "includes.h"
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include "log.h"
#include "misc.h"
#include "servconf.h"
#include "xmalloc.h"
#include "hostfile.h"
#include "auth.h"
extern ServerOptions options;
/*
* Configuration of enabled authentication methods. Separate from the rest of
* auth2-*.c because we want to query it during server configuration validity
* checking in the sshd listener process without pulling all the auth code in
* too.
*/
/* "none" is allowed only one time and it is cleared by userauth_none() later */
int none_enabled = 1;
struct authmethod_cfg methodcfg_none = {
"none",
NULL,
&none_enabled
};
struct authmethod_cfg methodcfg_pubkey = {
"publickey",
"publickey-hostbound-v00@openssh.com",
&options.pubkey_authentication
};
#ifdef GSSAPI
struct authmethod_cfg methodcfg_gssapi = {
"gssapi-with-mic",
NULL,
&options.gss_authentication
};
#endif
struct authmethod_cfg methodcfg_passwd = {
"password",
NULL,
&options.password_authentication
};
struct authmethod_cfg methodcfg_kbdint = {
"keyboard-interactive",
NULL,
&options.kbd_interactive_authentication
};
struct authmethod_cfg methodcfg_hostbased = {
"hostbased",
NULL,
&options.hostbased_authentication
};
static struct authmethod_cfg *authmethod_cfgs[] = {
&methodcfg_none,
&methodcfg_pubkey,
#ifdef GSSAPI
&methodcfg_gssapi,
#endif
&methodcfg_passwd,
&methodcfg_kbdint,
&methodcfg_hostbased,
NULL
};
/*
* Check a comma-separated list of methods for validity. If need_enable is
* non-zero, then also require that the methods are enabled.
* Returns 0 on success or -1 if the methods list is invalid.
*/
int
auth2_methods_valid(const char *_methods, int need_enable)
{
char *methods, *omethods, *method, *p;
u_int i, found;
int ret = -1;
const struct authmethod_cfg *cfg;
if (*_methods == '\0') {
error("empty authentication method list");
return -1;
}
omethods = methods = xstrdup(_methods);
while ((method = strsep(&methods, ",")) != NULL) {
for (found = i = 0; !found && authmethod_cfgs[i] != NULL; i++) {
cfg = authmethod_cfgs[i];
if ((p = strchr(method, ':')) != NULL)
*p = '\0';
if (strcmp(method, cfg->name) != 0)
continue;
if (need_enable) {
if (cfg->enabled == NULL ||
*(cfg->enabled) == 0) {
error("Disabled method \"%s\" in "
"AuthenticationMethods list \"%s\"",
method, _methods);
goto out;
}
}
found = 1;
break;
}
if (!found) {
error("Unknown authentication method \"%s\" in list",
method);
goto out;
}
}
ret = 0;
out:
free(omethods);
return ret;
}
|
