rcolebaugh / rpms / openssh

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8f2528
diff -up openssh-7.4p1/gss-genr.c.gsskexalg openssh-7.4p1/gss-genr.c
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--- openssh-7.4p1/gss-genr.c.gsskexalg	2017-02-09 10:46:50.417893132 +0100
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+++ openssh-7.4p1/gss-genr.c	2017-02-09 10:46:50.448893107 +0100
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@@ -77,7 +77,8 @@ ssh_gssapi_oid_table_ok() {
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  */
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 char *
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-ssh_gssapi_client_mechanisms(const char *host, const char *client) {
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+ssh_gssapi_client_mechanisms(const char *host, const char *client,
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+    const char *kex) {
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 	gss_OID_set gss_supported;
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 	OM_uint32 min_status;
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@@ -85,12 +86,12 @@ ssh_gssapi_client_mechanisms(const char
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 		return NULL;
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 	return(ssh_gssapi_kex_mechs(gss_supported, ssh_gssapi_check_mechanism,
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-	    host, client));
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+	    host, client, kex));
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 }
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 char *
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 ssh_gssapi_kex_mechs(gss_OID_set gss_supported, ssh_gssapi_check_fn *check,
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-    const char *host, const char *client) {
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+    const char *host, const char *client, const char *kex) {
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 	Buffer buf;
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 	size_t i;
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 	int oidpos, enclen;
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@@ -99,6 +100,7 @@ ssh_gssapi_kex_mechs(gss_OID_set gss_sup
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 	char deroid[2];
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 	const EVP_MD *evp_md = EVP_md5();
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 	EVP_MD_CTX md;
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+	char *s, *cp, *p;
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 	if (gss_enc2oid != NULL) {
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 		for (i = 0; gss_enc2oid[i].encoded != NULL; i++)
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@@ -112,6 +114,7 @@ ssh_gssapi_kex_mechs(gss_OID_set gss_sup
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 	buffer_init(&buf;;
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 	oidpos = 0;
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+	s = cp = strdup(kex);
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 	for (i = 0; i < gss_supported->count; i++) {
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 		if (gss_supported->elements[i].length < 128 &&
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 		    (*check)(NULL, &(gss_supported->elements[i]), host, client)) {
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@@ -130,26 +133,22 @@ ssh_gssapi_kex_mechs(gss_OID_set gss_sup
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 			enclen = __b64_ntop(digest, EVP_MD_size(evp_md),
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 			    encoded, EVP_MD_size(evp_md) * 2);
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-			if (oidpos != 0)
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-				buffer_put_char(&buf, ',');
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-
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-			buffer_append(&buf, KEX_GSS_GEX_SHA1_ID,
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-			    sizeof(KEX_GSS_GEX_SHA1_ID) - 1);
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-			buffer_append(&buf, encoded, enclen);
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-			buffer_put_char(&buf, ',');
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-			buffer_append(&buf, KEX_GSS_GRP1_SHA1_ID, 
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-			    sizeof(KEX_GSS_GRP1_SHA1_ID) - 1);
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-			buffer_append(&buf, encoded, enclen);
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-			buffer_put_char(&buf, ',');
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-			buffer_append(&buf, KEX_GSS_GRP14_SHA1_ID,
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-			    sizeof(KEX_GSS_GRP14_SHA1_ID) - 1);
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-			buffer_append(&buf, encoded, enclen);
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+			cp = strncpy(s, kex, strlen(kex));
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+			for ((p = strsep(&cp, ",")); p && *p != '\0';
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+				(p = strsep(&cp, ","))) {
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+				if (buffer_len(&buf) != 0)
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+					buffer_put_char(&buf, ',');
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+				buffer_append(&buf, p,
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+				    strlen(p));
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+				buffer_append(&buf, encoded, enclen);
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+			}
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 			gss_enc2oid[oidpos].oid = &(gss_supported->elements[i]);
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 			gss_enc2oid[oidpos].encoded = encoded;
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 			oidpos++;
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 		}
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 	}
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+	free(s);
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 	gss_enc2oid[oidpos].oid = NULL;
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 	gss_enc2oid[oidpos].encoded = NULL;
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diff -up openssh-7.4p1/gss-serv.c.gsskexalg openssh-7.4p1/gss-serv.c
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--- openssh-7.4p1/gss-serv.c.gsskexalg	2017-02-09 10:46:50.449893106 +0100
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+++ openssh-7.4p1/gss-serv.c	2017-02-09 10:55:12.189422901 +0100
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@@ -149,7 +149,7 @@ ssh_gssapi_server_mechanisms() {
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 	if (supported_oids == NULL)
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 		ssh_gssapi_prepare_supported_oids();
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 	return (ssh_gssapi_kex_mechs(supported_oids,
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-	    &ssh_gssapi_server_check_mech, NULL, NULL));
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+	    &ssh_gssapi_server_check_mech, NULL, NULL, options.gss_kex_algorithms));
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 }
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 /* Unprivileged */
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diff -up openssh-7.4p1/kex.c.gsskexalg openssh-7.4p1/kex.c
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--- openssh-7.4p1/kex.c.gsskexalg	2017-02-09 10:46:50.449893106 +0100
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+++ openssh-7.4p1/kex.c	2017-02-09 10:55:44.008393539 +0100
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@@ -248,6 +248,29 @@ kex_assemble_names(const char *def, char
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 	return 0;
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 }
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+/* Validate GSS KEX method name list */
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+int
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+gss_kex_names_valid(const char *names)
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+{
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+	char *s, *cp, *p;
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+
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+	if (names == NULL || *names == '\0')
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+		return 0;
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+	s = cp = strdup(names);
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+	for ((p = strsep(&cp, ",")); p && *p != '\0';
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+	    (p = strsep(&cp, ","))) {
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+		if (strncmp(p, "gss-", 4) != 0
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+		  || kex_alg_by_name(p) == NULL) {
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+			error("Unsupported KEX algorithm \"%.100s\"", p);
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+			free(s);
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+			return 0;
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+		}
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+	}
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+	debug3("gss kex names ok: [%s]", names);
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+	free(s);
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+	return 1;
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+}
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+
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 /* put algorithm proposal into buffer */
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 int
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 kex_prop2buf(struct sshbuf *b, char *proposal[PROPOSAL_MAX])
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diff -up openssh-7.4p1/kex.h.gsskexalg openssh-7.4p1/kex.h
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--- openssh-7.4p1/kex.h.gsskexalg	2017-02-09 10:46:50.452893104 +0100
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+++ openssh-7.4p1/kex.h	2017-02-09 11:02:35.313012903 +0100
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@@ -179,6 +179,7 @@ struct kex {
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 char	*kex_alg_list(char);
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 char	*kex_names_cat(const char *, const char *);
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 int	 kex_assemble_names(const char *, char **);
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+int	 gss_kex_names_valid(const char *);
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 int	 kex_new(struct ssh *, char *[PROPOSAL_MAX], struct kex **);
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 int	 kex_setup(struct ssh *, char *[PROPOSAL_MAX]);
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diff -up openssh-7.4p1/readconf.c.gsskexalg openssh-7.4p1/readconf.c
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--- openssh-7.4p1/readconf.c.gsskexalg	2017-02-09 10:46:50.420893129 +0100
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+++ openssh-7.4p1/readconf.c	2017-02-09 10:56:06.759372540 +0100
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@@ -64,6 +64,7 @@
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 #include "uidswap.h"
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 #include "myproposal.h"
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 #include "digest.h"
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+#include "ssh-gss.h"
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 /* Format of the configuration file:
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@@ -161,7 +162,7 @@ typedef enum {
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 	oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout,
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 	oAddressFamily, oGssAuthentication, oGssDelegateCreds,
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 	oGssTrustDns, oGssKeyEx, oGssClientIdentity, oGssRenewalRekey,
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-	oGssServerIdentity, 
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+	oGssServerIdentity, oGssKexAlgorithms,
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 	oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly,
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 	oSendEnv, oControlPath, oControlMaster, oControlPersist,
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 	oHashKnownHosts,
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@@ -213,6 +214,7 @@ static struct {
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 	{ "gssapiclientidentity", oGssClientIdentity },
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 	{ "gssapiserveridentity", oGssServerIdentity },
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 	{ "gssapirenewalforcesrekey", oGssRenewalRekey },
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+	{ "gssapikexalgorithms", oGssKexAlgorithms },
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 #else
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 	{ "gssapiauthentication", oUnsupported },
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 	{ "gssapikeyexchange", oUnsupported },
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@@ -220,6 +222,7 @@ static struct {
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 	{ "gssapitrustdns", oUnsupported },
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 	{ "gssapiclientidentity", oUnsupported },
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 	{ "gssapirenewalforcesrekey", oUnsupported },
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+	{ "gssapikexalgorithms", oUnsupported },
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 #endif
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 	{ "fallbacktorsh", oDeprecated },
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 	{ "usersh", oDeprecated },
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@@ -996,6 +999,18 @@ parse_time:
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 		intptr = &options->gss_renewal_rekey;
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 		goto parse_flag;
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+	case oGssKexAlgorithms:
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+		arg = strdelim(&s);
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+		if (!arg || *arg == '\0')
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+			fatal("%.200s line %d: Missing argument.",
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+			    filename, linenum);
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+		if (!gss_kex_names_valid(arg))
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+			fatal("%.200s line %d: Bad GSSAPI KexAlgorithms '%s'.",
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+			    filename, linenum, arg ? arg : "<NONE>");
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+		if (*activep && options->gss_kex_algorithms == NULL)
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+			options->gss_kex_algorithms = strdup(arg);
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+		break;
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+
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 	case oBatchMode:
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 		intptr = &options->batch_mode;
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 		goto parse_flag;
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@@ -1813,6 +1828,7 @@ initialize_options(Options * options)
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 	options->gss_renewal_rekey = -1;
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 	options->gss_client_identity = NULL;
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 	options->gss_server_identity = NULL;
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+	options->gss_kex_algorithms = NULL;
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 	options->password_authentication = -1;
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 	options->kbd_interactive_authentication = -1;
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 	options->kbd_interactive_devices = NULL;
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@@ -1964,6 +1980,10 @@ fill_default_options(Options * options)
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 		options->gss_trust_dns = 0;
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 	if (options->gss_renewal_rekey == -1)
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 		options->gss_renewal_rekey = 0;
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+#ifdef GSSAPI
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+	if (options->gss_kex_algorithms == NULL)
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+		options->gss_kex_algorithms = strdup(GSS_KEX_DEFAULT_KEX);
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+#endif
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 	if (options->password_authentication == -1)
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 		options->password_authentication = 1;
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 	if (options->kbd_interactive_authentication == -1)
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diff -up openssh-7.4p1/readconf.h.gsskexalg openssh-7.4p1/readconf.h
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--- openssh-7.4p1/readconf.h.gsskexalg	2017-02-09 10:46:50.420893129 +0100
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+++ openssh-7.4p1/readconf.h	2017-02-09 10:46:50.450893106 +0100
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@@ -51,6 +51,7 @@ typedef struct {
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 	int	gss_renewal_rekey;	/* Credential renewal forces rekey */
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 	char    *gss_client_identity;   /* Principal to initiate GSSAPI with */
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 	char    *gss_server_identity;   /* GSSAPI target principal */
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+	char   *gss_kex_algorithms;	/* GSSAPI kex methods to be offered by client. */
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 	int     password_authentication;	/* Try password
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 						 * authentication. */
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 	int     kbd_interactive_authentication; /* Try keyboard-interactive auth. */
8f2528
diff -up openssh-7.4p1/servconf.c.gsskexalg openssh-7.4p1/servconf.c
8f2528
--- openssh-7.4p1/servconf.c.gsskexalg	2017-02-09 10:46:50.446893109 +0100
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+++ openssh-7.4p1/servconf.c	2017-02-09 10:57:15.784309297 +0100
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@@ -57,6 +57,7 @@
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 #include "auth.h"
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 #include "myproposal.h"
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 #include "digest.h"
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+#include "ssh-gss.h"
8f2528
 
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 static void add_listen_addr(ServerOptions *, char *, int);
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 static void add_one_listen_addr(ServerOptions *, char *, int);
8f2528
@@ -117,6 +117,7 @@ initialize_server_options(ServerOptions
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 	options->gss_cleanup_creds = -1;
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 	options->gss_strict_acceptor = -1;
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 	options->gss_store_rekey = -1;
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+	options->gss_kex_algorithms = NULL;
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 	options->password_authentication = -1;
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 	options->kbd_interactive_authentication = -1;
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 	options->challenge_response_authentication = -1;
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@@ -280,6 +281,10 @@ fill_default_server_options(ServerOption
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 		options->gss_strict_acceptor = 1;
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 	if (options->gss_store_rekey == -1)
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 		options->gss_store_rekey = 0;
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+#ifdef GSSAPI
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+	if (options->gss_kex_algorithms == NULL)
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+		options->gss_kex_algorithms = strdup(GSS_KEX_DEFAULT_KEX);
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+#endif
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 	if (options->password_authentication == -1)
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 		options->password_authentication = 1;
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 	if (options->kbd_interactive_authentication == -1)
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@@ -422,7 +425,7 @@ typedef enum {
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 	sHostKeyAlgorithms,
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 	sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile,
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 	sGssAuthentication, sGssCleanupCreds, sGssEnablek5users, sGssStrictAcceptor,
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-	sGssKeyEx, sGssStoreRekey, sAcceptEnv, sPermitTunnel,
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+	sGssKeyEx, sGssStoreRekey, sGssKexAlgorithms, sAcceptEnv, sPermitTunnel,
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 	sMatch, sPermitOpen, sForceCommand, sChrootDirectory,
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 	sUsePrivilegeSeparation, sAllowAgentForwarding,
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 	sHostCertificate,
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@@ -501,6 +504,7 @@ static struct {
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 	{ "gssapikeyexchange", sGssKeyEx, SSHCFG_GLOBAL },
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 	{ "gssapistorecredentialsonrekey", sGssStoreRekey, SSHCFG_GLOBAL },
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 	{ "gssapienablek5users", sGssEnablek5users, SSHCFG_ALL },
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+	{ "gssapikexalgorithms", sGssKexAlgorithms, SSHCFG_GLOBAL },
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 #else
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 	{ "gssapiauthentication", sUnsupported, SSHCFG_ALL },
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 	{ "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL },
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@@ -508,6 +512,7 @@ static struct {
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 	{ "gssapikeyexchange", sUnsupported, SSHCFG_GLOBAL },
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 	{ "gssapistorecredentialsonrekey", sUnsupported, SSHCFG_GLOBAL },
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 	{ "gssapienablek5users", sUnsupported, SSHCFG_ALL },
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+	{ "gssapikexalgorithms", sUnsupported, SSHCFG_GLOBAL },
8f2528
 #endif
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 	{ "gssusesessionccache", sUnsupported, SSHCFG_GLOBAL },
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 	{ "gssapiusesessioncredcache", sUnsupported, SSHCFG_GLOBAL },
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@@ -1249,6 +1254,18 @@ process_server_config_line(ServerOptions
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 		intptr = &options->gss_store_rekey;
8f2528
 		goto parse_flag;
8f2528
 
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+	case sGssKexAlgorithms:
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+		arg = strdelim(&cp;;
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+		if (!arg || *arg == '\0')
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+			fatal("%.200s line %d: Missing argument.",
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+			    filename, linenum);
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+		if (!gss_kex_names_valid(arg))
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+			fatal("%.200s line %d: Bad GSSAPI KexAlgorithms '%s'.",
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+			    filename, linenum, arg ? arg : "<NONE>");
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+		if (*activep && options->gss_kex_algorithms == NULL)
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+			options->gss_kex_algorithms = strdup(arg);
8f2528
+		break;
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+
8f2528
 	case sPasswordAuthentication:
8f2528
 		intptr = &options->password_authentication;
8f2528
 		goto parse_flag;
8f2528
@@ -2304,6 +2321,7 @@ dump_config(ServerOptions *o)
8f2528
 	dump_cfg_fmtint(sGssKeyEx, o->gss_keyex);
8f2528
 	dump_cfg_fmtint(sGssStrictAcceptor, o->gss_strict_acceptor);
8f2528
 	dump_cfg_fmtint(sGssStoreRekey, o->gss_store_rekey);
8f2528
+	dump_cfg_string(sGssKexAlgorithms, o->gss_kex_algorithms);
8f2528
 #endif
8f2528
 	dump_cfg_fmtint(sPasswordAuthentication, o->password_authentication);
8f2528
 	dump_cfg_fmtint(sKbdInteractiveAuthentication,
8f2528
diff -up openssh-7.4p1/servconf.h.gsskexalg openssh-7.4p1/servconf.h
8f2528
--- openssh-7.4p1/servconf.h.gsskexalg	2017-02-09 10:46:50.450893106 +0100
8f2528
+++ openssh-7.4p1/servconf.h	2017-02-09 10:57:33.717292870 +0100
8f2528
@@ -116,6 +116,7 @@ typedef struct {
8f2528
 	int     gss_cleanup_creds;	/* If true, destroy cred cache on logout */
8f2528
 	int     gss_strict_acceptor;	/* If true, restrict the GSSAPI acceptor name */
8f2528
 	int 	gss_store_rekey;
8f2528
+	char   *gss_kex_algorithms;	/* GSSAPI kex methods to be offered by client. */
8f2528
 	int     password_authentication;	/* If true, permit password
8f2528
 						 * authentication. */
8f2528
 	int     kbd_interactive_authentication;	/* If true, permit */
8f2528
diff -up openssh-7.4p1/ssh.1.gsskexalg openssh-7.4p1/ssh.1
8f2528
--- openssh-7.4p1/ssh.1.gsskexalg	2017-02-09 10:46:50.443893111 +0100
8f2528
+++ openssh-7.4p1/ssh.1	2017-02-09 10:46:50.451893105 +0100
8f2528
@@ -517,6 +517,7 @@ For full details of the options listed b
8f2528
 .It GSSAPIDelegateCredentials
8f2528
 .It GSSAPIRenewalForcesRekey
8f2528
 .It GSSAPITrustDns
8f2528
+.It GSSAPIKexAlgorithms
8f2528
 .It HashKnownHosts
8f2528
 .It Host
8f2528
 .It HostbasedAuthentication
8f2528
diff -up openssh-7.4p1/ssh_config.5.gsskexalg openssh-7.4p1/ssh_config.5
8f2528
--- openssh-7.4p1/ssh_config.5.gsskexalg	2017-02-09 10:46:50.452893104 +0100
8f2528
+++ openssh-7.4p1/ssh_config.5	2017-02-09 11:00:39.053122745 +0100
8f2528
@@ -782,6 +782,18 @@ the name of the host being connected to.
8f2528
 command line will be passed untouched to the GSSAPI library.
8f2528
 The default is
8f2528
 .Dq no .
8f2528
+.It Cm GSSAPIKexAlgorithms
8f2528
+The list of key exchange algorithms that are offered for GSSAPI
8f2528
+key exchange. Possible values are
8f2528
+.Bd -literal -offset 3n
8f2528
+gss-gex-sha1-,
8f2528
+gss-group1-sha1-,
8f2528
+gss-group14-sha1-
8f2528
+.Ed
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+.Pp
8f2528
+The default is
8f2528
+.Dq gss-gex-sha1-,gss-group1-sha1-,gss-group14-sha1- .
8f2528
+This option only applies to protocol version 2 connections using GSSAPI.
8f2528
 .It Cm HashKnownHosts
8f2528
 Indicates that
8f2528
 .Xr ssh 1
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diff -up openssh-7.4p1/sshconnect2.c.gsskexalg openssh-7.4p1/sshconnect2.c
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--- openssh-7.4p1/sshconnect2.c.gsskexalg	2017-02-09 10:46:50.451893105 +0100
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+++ openssh-7.4p1/sshconnect2.c	2017-02-09 10:58:08.533260973 +0100
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@@ -181,7 +181,8 @@ ssh_kex2(char *host, struct sockaddr *ho
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 		else
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 			gss_host = host;
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-		gss = ssh_gssapi_client_mechanisms(gss_host, options.gss_client_identity);
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+		gss = ssh_gssapi_client_mechanisms(gss_host,
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+		    options.gss_client_identity, options.gss_kex_algorithms);
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 		if (gss) {
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 			debug("Offering GSSAPI proposal: %s", gss);
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 			xasprintf(&options.kex_algorithms,
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diff -up openssh-7.4p1/sshd_config.5.gsskexalg openssh-7.4p1/sshd_config.5
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--- openssh-7.4p1/sshd_config.5.gsskexalg	2017-02-09 10:46:50.452893104 +0100
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+++ openssh-7.4p1/sshd_config.5	2017-02-09 11:01:55.141050861 +0100
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@@ -666,6 +666,18 @@ Controls whether the user's GSSAPI crede
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 successful connection rekeying. This option can be used to accepted renewed 
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 or updated credentials from a compatible client. The default is
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 .Dq no .
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+.It Cm GSSAPIKexAlgorithms
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+The list of key exchange algorithms that are accepted by GSSAPI
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+key exchange. Possible values are
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+.Bd -literal -offset 3n
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+gss-gex-sha1-,
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+gss-group1-sha1-,
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+gss-group14-sha1-
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+.Ed
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+.Pp
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+The default is
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+.Dq gss-gex-sha1-,gss-group1-sha1-,gss-group14-sha1- .
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+This option only applies to protocol version 2 connections using GSSAPI.
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 .It Cm HostbasedAcceptedKeyTypes
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 Specifies the key types that will be accepted for hostbased authentication
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 as a comma-separated pattern list.
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diff -up openssh-7.4p1/ssh-gss.h.gsskexalg openssh-7.4p1/ssh-gss.h
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--- openssh-7.4p1/ssh-gss.h.gsskexalg	2017-02-09 10:46:50.425893125 +0100
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+++ openssh-7.4p1/ssh-gss.h	2017-02-09 10:46:50.451893105 +0100
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@@ -76,6 +76,11 @@ extern char **k5users_allowed_cmds;
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 #define KEX_GSS_GRP14_SHA1_ID				"gss-group14-sha1-"
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 #define KEX_GSS_GEX_SHA1_ID				"gss-gex-sha1-"
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+#define        GSS_KEX_DEFAULT_KEX \
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+	KEX_GSS_GEX_SHA1_ID "," \
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+	KEX_GSS_GRP1_SHA1_ID "," \
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+	KEX_GSS_GRP14_SHA1_ID
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+
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 typedef struct {
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 	char *filename;
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 	char *envvar;
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@@ -147,9 +152,9 @@ int ssh_gssapi_credentials_updated(Gssct
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 /* In the server */
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 typedef int ssh_gssapi_check_fn(Gssctxt **, gss_OID, const char *, 
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     const char *);
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-char *ssh_gssapi_client_mechanisms(const char *, const char *);
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+char *ssh_gssapi_client_mechanisms(const char *, const char *, const char *);
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 char *ssh_gssapi_kex_mechs(gss_OID_set, ssh_gssapi_check_fn *, const char *,
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-    const char *);
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+    const char *, const char *);
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 gss_OID ssh_gssapi_id_kex(Gssctxt *, char *, int);
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 int ssh_gssapi_server_check_mech(Gssctxt **,gss_OID, const char *, 
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     const char *);