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annotate sk-ecdsa.c @ 1855:35d504d59c05

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Implement server-side support for sk-ecdsa U2F-backed keys (#142) * Implement server-side support for sk-ecdsa U2F-backed keys * Fix out-of-bounds read on normal ecdsa-sha2-[identifier] keys * Fix one more potential out-of-bounds read * Check if nistp256 curve is used in sk-ecdsa-sha2- key It's the only allowed curve per PROTOCOL.u2f specification * Implement server-side support for sk-ed25519 FIDO2-backed keys * Keys with type sk-* make no sense as host keys, so they should be disabled * fix typo * Make sk-ecdsa call buf_ecdsa_verify This reduces code duplication, the SK code just handles the different message format. * Reduce sk specific code The application id can be stored in signkey, then we don't need to call sk-specific functions from svr-authpubkey * Remove debugging output, which causes compilation errors with DEBUG_TRACE disabled * Proper cleanup of sk_app Co-authored-by: Matt Johnston <[email protected]>
author egor-duda <egor-duda@users.noreply.github.com>
date Sat, 22 Jan 2022 16:53:04 +0300
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children 333688ec53d0
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35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
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1 #include "includes.h"
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2
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3 #if DROPBEAR_SK_ECDSA
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5 #include "dbutil.h"
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6 #include "ecc.h"
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7 #include "ecdsa.h"
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8 #include "sk-ecdsa.h"
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10 int buf_sk_ecdsa_verify(buffer *buf, const ecc_key *key, const buffer *data_buf, const char* app, unsigned int applen) {
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11 hash_state hs;
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12 unsigned char subhash[SHA256_HASH_SIZE];
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13 buffer *sk_buffer = NULL, *sig_buffer = NULL;
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14 unsigned char flags;
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15 unsigned int counter;
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16 int ret;
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18 TRACE(("buf_sk_ecdsa_verify"))
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20 /* from https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.u2f */
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21 /* ecdsa signature to verify (r, s) */
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22 sig_buffer = buf_getbuf(buf);
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24 flags = buf_getbyte (buf);
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25 counter = buf_getint (buf);
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26 /* create the message to be signed */
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27 sk_buffer = buf_new (2*SHA256_HASH_SIZE+5);
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28 sha256_init (&hs);
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29 sha256_process (&hs, app, applen);
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30 sha256_done (&hs, subhash);
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31 buf_putbytes (sk_buffer, subhash, sizeof (subhash));
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32 buf_putbyte (sk_buffer, flags);
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33 buf_putint (sk_buffer, counter);
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34 sha256_init (&hs);
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35 sha256_process (&hs, data_buf->data, data_buf->len);
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36 sha256_done (&hs, subhash);
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37 buf_putbytes (sk_buffer, subhash, sizeof (subhash));
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39 ret = buf_ecdsa_verify(sig_buffer, key, sk_buffer);
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40 buf_free(sk_buffer);
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41 buf_free(sig_buffer);
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43 TRACE(("leave buf_sk_ecdsa_verify, ret=%d", ret))
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44 return ret;
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45 }
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47 #endif /* DROPBEAR_SK_ECDSA */