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Expose a global list of known host key algorithms.

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The information was already centralised in find_pubkey_alg, but that
had a query-based API that couldn't enumerate the key types. Now I
expose an underlying array so that it's possible to iterate over them.

Also, I'd forgotten to add the two new rsa-sha2-* algorithms to
find_pubkey_alg. That's also done as part of this commit.
This commit is contained in:
Simon Tatham 2020-11-22 08:40:38 +00:00
parent e105908661
commit 24444eb396
2 changed files with 20 additions and 16 deletions
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2
ssh.h
View File

@ -1230,6 +1230,8 @@ int rsa1_loadpub_s(BinarySource *src, BinarySink *bs,
int rsa1_loadpub_f(const Filename *filename, BinarySink *bs,
char **commentptr, const char **errorstr);
extern const ssh_keyalg *const all_keyalgs[];
extern const size_t n_keyalgs;
const ssh_keyalg *find_pubkey_alg(const char *name);
const ssh_keyalg *find_pubkey_alg_len(ptrlen name);

34
sshpubk.c
View File

@ -634,24 +634,26 @@ static bool read_blob(BinarySource *src, int nlines, BinarySink *bs)
*/
ssh2_userkey ssh2_wrong_passphrase = { NULL, NULL };
const ssh_keyalg *const all_keyalgs[] = {
&ssh_rsa,
&ssh_rsa_sha256,
&ssh_rsa_sha512,
&ssh_dss,
&ssh_ecdsa_nistp256,
&ssh_ecdsa_nistp384,
&ssh_ecdsa_nistp521,
&ssh_ecdsa_ed25519,
&ssh_ecdsa_ed448,
};
const size_t n_keyalgs = lenof(all_keyalgs);
const ssh_keyalg *find_pubkey_alg_len(ptrlen name)
{
if (ptrlen_eq_string(name, "ssh-rsa"))
return &ssh_rsa;
else if (ptrlen_eq_string(name, "ssh-dss"))
return &ssh_dss;
else if (ptrlen_eq_string(name, "ecdsa-sha2-nistp256"))
return &ssh_ecdsa_nistp256;
else if (ptrlen_eq_string(name, "ecdsa-sha2-nistp384"))
return &ssh_ecdsa_nistp384;
else if (ptrlen_eq_string(name, "ecdsa-sha2-nistp521"))
return &ssh_ecdsa_nistp521;
else if (ptrlen_eq_string(name, "ssh-ed25519"))
return &ssh_ecdsa_ed25519;
else if (ptrlen_eq_string(name, "ssh-ed448"))
return &ssh_ecdsa_ed448;
else
return NULL;
for (size_t i = 0; i < n_keyalgs; i++)
if (ptrlen_eq_string(name, all_keyalgs[i]->ssh_id))
return all_keyalgs[i];
return NULL;
}
const ssh_keyalg *find_pubkey_alg(const char *name)