Rename gss-krb5 cred tgt_expire field

The tgt_expire field is used to store non-TGT expiry times in a couple
of cases: when the ccache has no TGT, and after we've obtained a cred
for the target service.  Rename it to just "expire" to be less
misleading.

src/lib/gssapi/krb5/accept_sec_context.c

@@ -251,7 +251,7 @@ rd_and_store_for_creds(context, auth_context, inbuf, out_cred)
         cred->usage = GSS_C_INITIATE; /* we can't accept with this */
         /* cred->name already set */
         cred->keytab = NULL; /* no keytab associated with this... */
-        cred->tgt_expire = creds[0]->times.endtime; /* store the end time */
+        cred->expire = creds[0]->times.endtime; /* store the end time */
         cred->ccache = ccache; /* the ccache containing the credential */
         cred->destroy_ccache = 1;
         ccache = NULL; /* cred takes ownership so don't destroy */

src/lib/gssapi/krb5/acquire_cred.c

@@ -458,7 +458,7 @@ scan_ccache(krb5_context context, krb5_gss_cred_id_rec *cred,
         endtime = creds.times.endtime;
         krb5_free_cred_contents(context, &creds);
         if (is_tgt || !got_endtime)
-            cred->tgt_expire = creds.times.endtime;
+            cred->expire = creds.times.endtime;
         got_endtime = 1;
     }
     krb5_cc_end_seq_get(context, ccache, &cursor);
@@ -657,7 +657,7 @@ acquire_cred(OM_uint32 *minor_status, gss_name_t desired_name,
             goto krb_error_out;
 
         if (time_rec)
-            *time_rec = (cred->tgt_expire > now) ? (cred->tgt_expire - now) : 0;
+            *time_rec = (cred->expire > now) ? (cred->expire - now) : 0;
     }
 
     *minor_status = 0;

src/lib/gssapi/krb5/gssapiP_krb5.h

@@ -183,7 +183,7 @@ typedef struct _krb5_gss_cred_id_rec {
 
     /* ccache (init) data */
     krb5_ccache ccache;
-    krb5_timestamp tgt_expire;
+    krb5_timestamp expire;
     krb5_enctype *req_enctypes;  /* limit negotiated enctypes to this list */
     char *password;
 } krb5_gss_cred_id_rec, *krb5_gss_cred_id_t;

src/lib/gssapi/krb5/iakerb.c

@@ -549,7 +549,7 @@ iakerb_initiator_step(iakerb_ctx_id_t ctx,
             goto cleanup;
         if (!(flags & KRB5_INIT_CREDS_STEP_FLAG_CONTINUE)) {
             krb5_init_creds_get_times(ctx->k5c, ctx->icc, &times);
-            cred->tgt_expire = times.endtime;
+            cred->expire = times.endtime;
 
             krb5_init_creds_free(ctx->k5c, ctx->icc);
             ctx->icc = NULL;
@@ -571,7 +571,7 @@ iakerb_initiator_step(iakerb_ctx_id_t ctx,
             goto cleanup;
         if (!(flags & KRB5_TKT_CREDS_STEP_FLAG_CONTINUE)) {
             krb5_tkt_creds_get_times(ctx->k5c, ctx->tcc, &times);
-            cred->tgt_expire = times.endtime;
+            cred->expire = times.endtime;
 
             krb5_tkt_creds_free(ctx->k5c, ctx->tcc);
             ctx->tcc = NULL;

src/lib/gssapi/krb5/init_sec_context.c

@@ -212,7 +212,7 @@ static krb5_error_code get_credentials(context, cred, server, now,
             krb5_free_cred_contents(context, &tgt_creds);
             goto cleanup;
         }
-        cred->tgt_expire = tgt_creds.times.endtime;
+        cred->expire = tgt_creds.times.endtime;
         krb5_free_cred_contents(context, &tgt_creds);
 
         code = krb5_get_credentials(context, flags, cred->ccache,

src/lib/gssapi/krb5/inq_cred.c

@@ -130,8 +130,8 @@ krb5_gss_inquire_cred(minor_status, cred_handle, name, lifetime_ret,
         goto fail;
     }
 
-    if (cred->tgt_expire > 0) {
-        if ((lifetime = cred->tgt_expire - now) < 0)
+    if (cred->expire > 0) {
+        if ((lifetime = cred->expire - now) < 0)
             lifetime = 0;
     }
     else

src/lib/gssapi/krb5/s4u_gss_glue.c

@@ -243,7 +243,7 @@ kg_compose_deleg_cred(OM_uint32 *minor_status,
 
     cred->usage = GSS_C_INITIATE;
 
-    cred->tgt_expire = subject_creds->times.endtime;
+    cred->expire = subject_creds->times.endtime;
 
     code = kg_init_name(context, subject_creds->client, NULL, NULL, NULL, 0,
                         &cred->name);
@@ -282,7 +282,7 @@ kg_compose_deleg_cred(OM_uint32 *minor_status,
         if (code != 0)
             goto cleanup;
 
-        *time_rec = cred->tgt_expire - now;
+        *time_rec = cred->expire - now;
     }
 
     major_status = GSS_S_COMPLETE;