Mercurial > dropbear

annotate sk-ecdsa.c @ 1938:77bc00dcc19f default tip main master

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Bump version to 2022.82
author Matt Johnston <matt@ucc.asn.au>
date Fri, 01 Apr 2022 14:43:27 +0800
parents 333688ec53d0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1855
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
1 #include "includes.h"
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
2
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
3 #if DROPBEAR_SK_ECDSA
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
4
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
5 #include "dbutil.h"
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
6 #include "ecc.h"
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
7 #include "ecdsa.h"
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
8 #include "sk-ecdsa.h"
1928
333688ec53d0 Handle ecdsa-sk flags, reject no-touch
Matt Johnston <matt@ucc.asn.au>
parents: 1855
diff changeset
9 #include "ssh.h"
1855
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
10
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
11 int buf_sk_ecdsa_verify(buffer *buf, const ecc_key *key, const buffer *data_buf, const char* app, unsigned int applen) {
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
12 hash_state hs;
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
13 unsigned char subhash[SHA256_HASH_SIZE];
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
14 buffer *sk_buffer = NULL, *sig_buffer = NULL;
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
15 unsigned char flags;
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
16 unsigned int counter;
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
17 int ret;
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
18
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
19 TRACE(("buf_sk_ecdsa_verify"))
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
20
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
21 /* from https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.u2f */
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
22 /* ecdsa signature to verify (r, s) */
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
23 sig_buffer = buf_getbuf(buf);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
24
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
25 flags = buf_getbyte (buf);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
26 counter = buf_getint (buf);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
27 /* create the message to be signed */
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
28 sk_buffer = buf_new (2*SHA256_HASH_SIZE+5);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
29 sha256_init (&hs);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
30 sha256_process (&hs, app, applen);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
31 sha256_done (&hs, subhash);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
32 buf_putbytes (sk_buffer, subhash, sizeof (subhash));
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
33 buf_putbyte (sk_buffer, flags);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
34 buf_putint (sk_buffer, counter);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
35 sha256_init (&hs);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
36 sha256_process (&hs, data_buf->data, data_buf->len);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
37 sha256_done (&hs, subhash);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
38 buf_putbytes (sk_buffer, subhash, sizeof (subhash));
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
39
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
40 ret = buf_ecdsa_verify(sig_buffer, key, sk_buffer);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
41 buf_free(sk_buffer);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
42 buf_free(sig_buffer);
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
43
1928
333688ec53d0 Handle ecdsa-sk flags, reject no-touch
Matt Johnston <matt@ucc.asn.au>
parents: 1855
diff changeset
44 /* TODO: allow "no-touch-required" or "verify-required" authorized_keys options */
333688ec53d0 Handle ecdsa-sk flags, reject no-touch
Matt Johnston <matt@ucc.asn.au>
parents: 1855
diff changeset
45 if (!(flags & SSH_SK_USER_PRESENCE_REQD)) {
333688ec53d0 Handle ecdsa-sk flags, reject no-touch
Matt Johnston <matt@ucc.asn.au>
parents: 1855
diff changeset
46 if (ret == DROPBEAR_SUCCESS) {
333688ec53d0 Handle ecdsa-sk flags, reject no-touch
Matt Johnston <matt@ucc.asn.au>
parents: 1855
diff changeset
47 dropbear_log(LOG_WARNING, "Rejecting, user-presence not set");
333688ec53d0 Handle ecdsa-sk flags, reject no-touch
Matt Johnston <matt@ucc.asn.au>
parents: 1855
diff changeset
48 }
333688ec53d0 Handle ecdsa-sk flags, reject no-touch
Matt Johnston <matt@ucc.asn.au>
parents: 1855
diff changeset
49 ret = DROPBEAR_FAILURE;
333688ec53d0 Handle ecdsa-sk flags, reject no-touch
Matt Johnston <matt@ucc.asn.au>
parents: 1855
diff changeset
50 }
333688ec53d0 Handle ecdsa-sk flags, reject no-touch
Matt Johnston <matt@ucc.asn.au>
parents: 1855
diff changeset
51
1855
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
52 TRACE(("leave buf_sk_ecdsa_verify, ret=%d", ret))
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
53 return ret;
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
54 }
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
55
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
parents:
diff changeset
56 #endif /* DROPBEAR_SK_ECDSA */