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authorChuck Lever <chuck.lever@oracle.com>2018-08-20 10:39:16 -0400
committerJ. Bruce Fields <bfields@redhat.com>2018-08-22 18:32:07 -0400
commit108b833cde9c9b93204e6a4e455829a67f9785c3 (patch)
tree772ff5622407763f3ae4867f073f71c2572a9a15 /net/sunrpc
parenta26dd64f5477968d730cf92868b4092314b8e45e (diff)
downloadlinux-108b833cde9c9b93204e6a4e455829a67f9785c3.tar.bz2
sunrpc: Add comment defining gssd upcall API keywords
During review, it was found that the target, service, and srchost keywords are easily conflated. Add an explainer. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/auth_gss/auth_gss.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 1943e1198804..246075960712 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -461,12 +461,28 @@ static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
buflen -= len;
p += len;
gss_msg->msg.len = len;
+
+ /*
+ * target= is a full service principal that names the remote
+ * identity that we are authenticating to.
+ */
if (target_name) {
len = scnprintf(p, buflen, "target=%s ", target_name);
buflen -= len;
p += len;
gss_msg->msg.len += len;
}
+
+ /*
+ * gssd uses service= and srchost= to select a matching key from
+ * the system's keytab to use as the source principal.
+ *
+ * service= is the service name part of the source principal,
+ * or "*" (meaning choose any).
+ *
+ * srchost= is the hostname part of the source principal. When
+ * not provided, gssd uses the local hostname.
+ */
if (service_name) {
char *c = strchr(service_name, '@');
@@ -482,6 +498,7 @@ static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
p += len;
gss_msg->msg.len += len;
}
+
if (mech->gm_upcall_enctypes) {
len = scnprintf(p, buflen, "enctypes=%s ",
mech->gm_upcall_enctypes);