summaryrefslogtreecommitdiff
path: root/kex.c
diff options
context:
space:
mode:
authorSimon Wilkinson <simon@sxw.org.uk>2014-02-09 16:09:48 +0000
committerColin Watson <cjwatson@debian.org>2016-01-04 13:43:45 +0000
commitd6cfd64ea0a567d88152270a94be6bb2a78daeb9 (patch)
treed0952dba1a30c4bf5c4301613e18ac1dea67d998 /kex.c
parent651211fd4a199b299540c00c54a46e27fadb04be (diff)
GSSAPI key exchange support
This patch has been rejected upstream: "None of the OpenSSH developers are in favour of adding this, and this situation has not changed for several years. This is not a slight on Simon's patch, which is of fine quality, but just that a) we don't trust GSSAPI implementations that much and b) we don't like adding new KEX since they are pre-auth attack surface. This one is particularly scary, since it requires hooks out to typically root-owned system resources." However, quite a lot of people rely on this in Debian, and it's better to have it merged into the main openssh package rather than having separate -krb5 packages (as we used to have). It seems to have a generally good security history. Bug: https://bugzilla.mindrot.org/show_bug.cgi?id=1242 Last-Updated: 2016-01-04 Patch-Name: gssapi.patch
Diffstat (limited to 'kex.c')
-rw-r--r--kex.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/kex.c b/kex.c
index 5100c661d..39a6f98c4 100644
--- a/kex.c
+++ b/kex.c
@@ -55,6 +55,10 @@
55#include "sshbuf.h" 55#include "sshbuf.h"
56#include "digest.h" 56#include "digest.h"
57 57
58#ifdef GSSAPI
59#include "ssh-gss.h"
60#endif
61
58#if OPENSSL_VERSION_NUMBER >= 0x00907000L 62#if OPENSSL_VERSION_NUMBER >= 0x00907000L
59# if defined(HAVE_EVP_SHA256) 63# if defined(HAVE_EVP_SHA256)
60# define evp_ssh_sha256 EVP_sha256 64# define evp_ssh_sha256 EVP_sha256
@@ -97,6 +101,14 @@ static const struct kexalg kexalgs[] = {
97#endif /* HAVE_EVP_SHA256 || !WITH_OPENSSL */ 101#endif /* HAVE_EVP_SHA256 || !WITH_OPENSSL */
98 { NULL, -1, -1, -1}, 102 { NULL, -1, -1, -1},
99}; 103};
104static const struct kexalg kexalg_prefixes[] = {
105#ifdef GSSAPI
106 { KEX_GSS_GEX_SHA1_ID, KEX_GSS_GEX_SHA1, 0, SSH_DIGEST_SHA1 },
107 { KEX_GSS_GRP1_SHA1_ID, KEX_GSS_GRP1_SHA1, 0, SSH_DIGEST_SHA1 },
108 { KEX_GSS_GRP14_SHA1_ID, KEX_GSS_GRP14_SHA1, 0, SSH_DIGEST_SHA1 },
109#endif
110 { NULL, -1, -1, -1 },
111};
100 112
101char * 113char *
102kex_alg_list(char sep) 114kex_alg_list(char sep)
@@ -129,6 +141,10 @@ kex_alg_by_name(const char *name)
129 if (strcmp(k->name, name) == 0) 141 if (strcmp(k->name, name) == 0)
130 return k; 142 return k;
131 } 143 }
144 for (k = kexalg_prefixes; k->name != NULL; k++) {
145 if (strncmp(k->name, name, strlen(k->name)) == 0)
146 return k;
147 }
132 return NULL; 148 return NULL;
133} 149}
134 150