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gpg: Prepare revocation keys for use with v5 keys.

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* g10/packet.h (struct revocation_key): Add field 'fprlen'.
* g10/parse-packet.c (parse_revkeys): Set fprlen and allow for v5
keys.  Also fix reading of unitialized data at place where
MAX_FINGERPRINT_LEN is used.
* g10/revoke.c (gen_desig_revoke): Allow for v5 keys and use fprlen.
Do an explicit compare to avoid reading unitialized data.
* g10/sig-check.c (check_revocation_keys): Use the fprlen.
* g10/getkey.c (merge_selfsigs_main): Do an explicit copy to avoid
reading unitialized data.
* g10/import.c (revocation_present): Use fprlen.
* g10/keyedit.c (show_key_with_all_names): Use fprlen.
(menu_addrevoker): Use fprlen.  Allow for v5 keys.
* g10/keygen.c (keygen_add_revkey): Use fprlen.
(parse_revocation_key): Allow for v5 keys.
* g10/keyid.c (keyid_from_fingerprint): Allow for v5 keys.  Print a
better error message in case of bogus fingerprints.
* g10/keylist.c (print_revokers): Use fprlen.
--

The reading of uninitialized data is harmless but we better fix it to
make valgrind happy.  More serious was that we always passed
MAX_FINGERPRINT_LEN but we will need to support 20 and 32 octet
fingerprints and MAX_FINGERPRINT_LEN would be too large for a v4.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2018-12-04 15:43:19 +01:00
parent ba46a359b9
commit c6e2ee0207
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
10 changed files with 66 additions and 40 deletions
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4
g10/sig-check.c
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@ -716,8 +716,8 @@ check_revocation_keys (ctrl_t ctrl, PKT_public_key *pk, PKT_signature *sig)
/* The revoker's keyid. */
u32 keyid[2];
keyid_from_fingerprint (ctrl, pk->revkey[i].fpr,
MAX_FINGERPRINT_LEN, keyid);
keyid_from_fingerprint (ctrl, pk->revkey[i].fpr, pk->revkey[i].fprlen,
keyid);
if(keyid[0]==sig->keyid[0] && keyid[1]==sig->keyid[1])
/* The signature was generated by a designated revoker.