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| author | Chuck Lever <chuck.lever@oracle.com> | 2018-08-16 19:05:54 +0300 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2018-08-23 01:32:07 +0300 |
| commit | a1a237775ec8fd2694b9f8e451821fd168e730d8 (patch) | |
| tree | 1955a598d3f33061be0d0f89e47628269b049a86 /net/sunrpc/auth_gss | |
| parent | 44090cc876926277329e1608bafc01b9f6da627f (diff) | |
| download | linux-a1a237775ec8fd2694b9f8e451821fd168e730d8.tar.xz | |
sunrpc: Enable the kernel to specify the hostname part of service principals
A multi-homed NFS server may have more than one "nfs" key in its
keytab. Enable the kernel to pick the key it wants as a machine
credential when establishing a GSS context.
This is useful for GSS-protected NFSv4.0 callbacks, which are
required by RFC 7530 S3.3.3 to use the same principal as the service
principal the client used when establishing its lease.
A complementary modification to rpc.gssd is required to fully enable
this feature.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc/auth_gss')
| -rw-r--r-- | net/sunrpc/auth_gss/auth_gss.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index be8f103d22fd..1943e1198804 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -284,7 +284,12 @@ err: return p; } -#define UPCALL_BUF_LEN 128 +/* XXX: Need some documentation about why UPCALL_BUF_LEN is so small. + * Is user space expecting no more than UPCALL_BUF_LEN bytes? + * Note that there are now _two_ NI_MAXHOST sized data items + * being passed in this string. + */ +#define UPCALL_BUF_LEN 256 struct gss_upcall_msg { refcount_t count; @@ -462,8 +467,17 @@ static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, p += len; gss_msg->msg.len += len; } - if (service_name != NULL) { - len = scnprintf(p, buflen, "service=%s ", service_name); + if (service_name) { + char *c = strchr(service_name, '@'); + + if (!c) + len = scnprintf(p, buflen, "service=%s ", + service_name); + else + len = scnprintf(p, buflen, + "service=%.*s srchost=%s ", + (int)(c - service_name), + service_name, c + 1); buflen -= len; p += len; gss_msg->msg.len += len; |