rcolebaugh / rpms / openssh

Forked from rpms/openssh 2 years ago
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--- compat.h.orig	2020-10-05 10:09:02.953505129 -0700
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+++ compat.h	2020-10-05 10:10:17.587733113 -0700
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@@ -34,7 +34,7 @@
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 #define SSH_BUG_UTF8TTYMODE	0x00000001
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 #define SSH_BUG_SIGTYPE		0x00000002
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-/* #define unused		0x00000004 */
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+#define SSH_BUG_SIGTYPE74	0x00000004
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 /* #define unused		0x00000008 */
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 #define SSH_OLD_SESSIONID	0x00000010
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 /* #define unused		0x00000020 */
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--- compat.c.orig	2020-10-05 10:25:02.088720562 -0700
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+++ compat.c	2020-10-05 10:13:11.637282492 -0700
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@@ -65,11 +65,12 @@
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 		{ "OpenSSH_6.5*,"
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 		  "OpenSSH_6.6*",	SSH_NEW_OPENSSH|SSH_BUG_CURVE25519PAD|
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 					SSH_BUG_SIGTYPE},
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+		{ "OpenSSH_7.4*",	SSH_NEW_OPENSSH|SSH_BUG_SIGTYPE|
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+		  			SSH_BUG_SIGTYPE74},
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 		{ "OpenSSH_7.0*,"
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 		  "OpenSSH_7.1*,"
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 		  "OpenSSH_7.2*,"
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 		  "OpenSSH_7.3*,"
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-		  "OpenSSH_7.4*,"
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 		  "OpenSSH_7.5*,"
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 		  "OpenSSH_7.6*,"
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 		  "OpenSSH_7.7*",	SSH_NEW_OPENSSH|SSH_BUG_SIGTYPE},
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--- sshconnect2.c.orig	2020-09-26 07:26:37.618010545 -0700
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+++ sshconnect2.c	2020-10-05 10:47:22.116315148 -0700
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@@ -1305,6 +1305,26 @@
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 			break;
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 	}
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 	free(oallowed);
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+	/*
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+	 * OpenSSH 7.4 supports SHA2 sig types, but fails to indicate its
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+	 * support.  For that release, check the local policy against the
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+	 * SHA2 signature types.
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+	 */
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+	if (alg == NULL &&
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+	    (key->type == KEY_RSA && (datafellows & SSH_BUG_SIGTYPE74))) {
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+		oallowed = allowed = xstrdup(options.pubkey_key_types);
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+		while ((cp = strsep(&allowed, ",")) != NULL) {
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+			if (sshkey_type_from_name(cp) != key->type)
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+				continue;
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+			tmp = match_list(sshkey_sigalg_by_name(cp), "rsa-sha2-256,rsa-sha2-512", NULL);
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+			if (tmp != NULL)
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+				alg = xstrdup(cp);
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+			free(tmp);
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+			if (alg != NULL)
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+				break;
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+		}
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+		free(oallowed);
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+	}
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 	return alg;
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 }
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