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Commit | Line | Data |
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8efc0c15 | 1 | /* |
2 | ||
3 | auth-rh-rsa.c | |
4 | ||
5 | Author: Tatu Ylonen <ylo@cs.hut.fi> | |
6 | ||
7 | Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
8 | All rights reserved | |
9 | ||
10 | Created: Sun May 7 03:08:06 1995 ylo | |
11 | ||
12 | Rhosts or /etc/hosts.equiv authentication combined with RSA host | |
13 | authentication. | |
14 | ||
15 | */ | |
16 | ||
17 | #include "includes.h" | |
18 | RCSID("$Id$"); | |
19 | ||
20 | #include "packet.h" | |
21 | #include "ssh.h" | |
22 | #include "xmalloc.h" | |
23 | #include "uidswap.h" | |
24 | ||
25 | /* Tries to authenticate the user using the .rhosts file and the host using | |
26 | its host key. Returns true if authentication succeeds. | |
27 | .rhosts and .shosts will be ignored if ignore_rhosts is non-zero. */ | |
28 | ||
29 | int auth_rhosts_rsa(struct passwd *pw, const char *client_user, | |
30 | unsigned int client_host_key_bits, | |
31 | BIGNUM *client_host_key_e, BIGNUM *client_host_key_n, | |
32 | int ignore_rhosts, int strict_modes) | |
33 | { | |
34 | const char *canonical_hostname; | |
35 | HostStatus host_status; | |
36 | BIGNUM *ke, *kn; | |
37 | ||
38 | debug("Trying rhosts with RSA host authentication for %.100s", client_user); | |
39 | ||
40 | /* Check if we would accept it using rhosts authentication. */ | |
41 | if (!auth_rhosts(pw, client_user, ignore_rhosts, strict_modes)) | |
42 | return 0; | |
43 | ||
44 | canonical_hostname = get_canonical_hostname(); | |
45 | ||
46 | debug("Rhosts RSA authentication: canonical host %.900s", | |
47 | canonical_hostname); | |
48 | ||
49 | /* Check if we know the host and its host key. */ | |
50 | /* Check system-wide host file. */ | |
51 | ke = BN_new(); | |
52 | kn = BN_new(); | |
53 | host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname, | |
54 | client_host_key_bits, client_host_key_e, | |
55 | client_host_key_n, ke, kn); | |
56 | BN_free(ke); | |
57 | BN_free(kn); | |
58 | if (host_status != HOST_OK) { | |
59 | /* The host key was not found. */ | |
60 | debug("Rhosts with RSA host authentication denied: unknown or invalid host key"); | |
61 | packet_send_debug("Your host key cannot be verified: unknown or invalid host key."); | |
62 | return 0; | |
63 | } | |
64 | ||
65 | /* A matching host key was found and is known. */ | |
66 | ||
67 | /* Perform the challenge-response dialog with the client for the host key. */ | |
68 | if (!auth_rsa_challenge_dialog(client_host_key_bits, | |
69 | client_host_key_e, client_host_key_n)) | |
70 | { | |
71 | log("Client on %.800s failed to respond correctly to host authentication.", | |
72 | canonical_hostname); | |
73 | return 0; | |
74 | } | |
75 | ||
76 | /* We have authenticated the user using .rhosts or /etc/hosts.equiv, and | |
77 | the host using RSA. We accept the authentication. */ | |
78 | ||
79 | log("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.", | |
80 | pw->pw_name, client_user, canonical_hostname); | |
81 | packet_send_debug("Rhosts with RSA host authentication accepted."); | |
82 | return 1; | |
83 | } |