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Allow to disable RSA signatures with SHA-1

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This commit is contained in:
Jakub Jelen 2018-11-14 09:54:54 +01:00
parent 3ae9c1b0c1
commit 57e280d1f4
2 changed files with 66 additions and 0 deletions
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62
openssh-7.9p1-disable-sha1.patch Normal file
View File

@ -0,0 +1,62 @@
diff --git a/monitor.c b/monitor.c
index 12b33e7..a1c3c97 100644
--- a/monitor.c
+++ b/monitor.c
@@ -875,6 +875,34 @@ mm_answer_bsdauthrespond(int sock, struct sshbuf *m)
}
#endif
+/*
+ * Check that the key type appears in the supplied pattern list, ignoring
+ * mismastches in the signature algorithm. (Signature algorithm checks are
+ * performed in the unprivileged authentication code).
+ * Returns 1 on success, 0 otherwise.
+ */
+static int
+key_base_type_match(const struct sshkey *key, const char *list)
+{
+ char *s, *l, *ol = xstrdup(list);
+ int found = 0;
+
+ l = ol;
+ for ((s = strsep(&l, ",")); s && *s != '\0'; (s = strsep(&l, ","))) {
+ if (sshkey_type_from_name(s) == key->type) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found) {
+ debug("key type %s does not appear in list %s",
+ sshkey_ssh_name(key), list);
+ }
+
+ free(ol);
+ return found;
+}
+
int
mm_answer_keyallowed(int sock, struct sshbuf *m)
{
@@ -909,8 +937,8 @@ mm_answer_keyallowed(int sock, struct sshbuf *m)
break;
if (auth2_key_already_used(authctxt, key))
break;
- if (match_pattern_list(sshkey_ssh_name(key),
- options.pubkey_key_types, 0) != 1)
+ if (!key_base_type_match(key,
+ options.pubkey_key_types))
break;
allowed = user_key_allowed(ssh, authctxt->pw, key,
pubkey_auth_attempt, &opts);
@@ -921,8 +949,8 @@ mm_answer_keyallowed(int sock, struct sshbuf *m)
break;
if (auth2_key_already_used(authctxt, key))
break;
- if (match_pattern_list(sshkey_ssh_name(key),
- options.hostbased_key_types, 0) != 1)
+ if (!key_base_type_match(key,
+ options.hostbased_key_types))
break;
allowed = hostbased_key_allowed(authctxt->pw,
cuser, chost, key);

4
openssh.spec
View File

@ -223,6 +223,9 @@ Patch951: openssh-7.6p1-pkcs11-uri.patch
Patch952: openssh-7.6p1-pkcs11-ecdsa.patch
# Unbreak scp between two IPv6 hosts (#1620333)
Patch953: openssh-7.8p1-scp-ipv6.patch
# Allow to disable RSA signatures with SHA-1 in server
# https://bugzilla.mindrot.org/show_bug.cgi?id=2746
Patch954: openssh-7.9p1-disable-sha1.patch
License: BSD
Group: Applications/Internet
@ -446,6 +449,7 @@ popd
%patch952 -p1 -b .pkcs11-ecdsa
%patch953 -p1 -b .scp-ipv6
%patch808 -p1 -b .gsskex-method
%patch954 -p1 -b .disable-sha1
%patch200 -p1 -b .audit
%patch201 -p1 -b .audit-race