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sunrpc: Add comment defining gssd upcall API keywords

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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>
This commit is contained in:
Chuck Lever 2018-08-20 10:39:16 -04:00 committed by J. Bruce Fields
parent a26dd64f54
commit 108b833cde
1 changed files with 17 additions and 0 deletions
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17
net/sunrpc/auth_gss/auth_gss.c
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@ -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);