diff options
author | Damien Miller <djm@mindrot.org> | 1999-10-27 13:42:43 +1000 |
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committer | Damien Miller <djm@mindrot.org> | 1999-10-27 13:42:43 +1000 |
commit | d4a8b7e34dd619a4debf9a206c81db26d1402ea6 (patch) | |
tree | a47d770a2f790f40d18b0982d4e55fa7cfb1fa3b /auth-rh-rsa.c |
Initial revision
Diffstat (limited to 'auth-rh-rsa.c')
-rw-r--r-- | auth-rh-rsa.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/auth-rh-rsa.c b/auth-rh-rsa.c new file mode 100644 index 000000000..c433578bf --- /dev/null +++ b/auth-rh-rsa.c | |||
@@ -0,0 +1,83 @@ | |||
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: auth-rh-rsa.c,v 1.1 1999/10/27 03:42:43 damien Exp $"); | ||
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 | } | ||