[cifs-utils PATCHv2 6/6] cifs.upcall: stop passing around ccache name strings
Jeff Layton
jlayton at samba.org
Thu Aug 25 14:17:45 UTC 2016
Instead, get a ccache handle and pass that around. That way we can keep
the cache open until the program is complete as well.
Signed-off-by: Jeff Layton <jlayton at samba.org>
---
cifs.upcall.c | 98 +++++++++++++++++++++++++----------------------------------
1 file changed, 41 insertions(+), 57 deletions(-)
diff --git a/cifs.upcall.c b/cifs.upcall.c
index a20576654a95..8f146c92b4a5 100644
--- a/cifs.upcall.c
+++ b/cifs.upcall.c
@@ -117,7 +117,7 @@ static time_t get_tgt_time(krb5_ccache ccache)
if (krb5_cc_get_principal(context, ccache, &principal)) {
syslog(LOG_DEBUG, "%s: unable to get principal", __func__);
- goto err_princ;
+ goto err_cache;
}
if (krb5_cc_start_seq_get(context, ccache, &cur)) {
@@ -154,32 +154,27 @@ err_cache:
return credtime;
}
-static char *
+static krb5_ccache
get_default_cc(void)
{
- const char *ccname;
- char *rcc = NULL;
- krb5_ccache ccache;
+ krb5_error_code ret;
+ krb5_ccache cc;
- ccname = krb5_cc_default_name(context);
- if (!ccname) {
- syslog(LOG_DEBUG, "%s: krb5_cc_default returned NULL.", __func__);
+ ret = krb5_cc_default(context, &cc);
+ if (ret) {
+ syslog(LOG_DEBUG, "%s: krb5_cc_default returned %d", __func__, ret);
return NULL;
}
- if (krb5_cc_resolve(context, ccname, &ccache)) {
- syslog(LOG_DEBUG, "%s: unable to resolve krb5 cache", __func__);
- return NULL;
+ if (!get_tgt_time(cc)) {
+ krb5_cc_close(context, cc);
+ cc = NULL;
}
-
- if (get_tgt_time(ccache))
- rcc = strdup(ccname);
- krb5_cc_close(context, ccache);
- return rcc;
+ return cc;
}
-static char *
+static krb5_ccache
init_cc_from_keytab(const char *keytab_name, const char *user)
{
krb5_error_code ret;
@@ -187,7 +182,6 @@ init_cc_from_keytab(const char *keytab_name, const char *user)
krb5_keytab keytab = NULL;
krb5_principal me = NULL;
krb5_ccache cc = NULL;
- char *ccname = NULL;
memset((char *) &my_creds, 0, sizeof(my_creds));
@@ -229,61 +223,46 @@ init_cc_from_keytab(const char *keytab_name, const char *user)
}
ret = krb5_cc_store_cred(context, cc, &my_creds);
- if (ret)
+ if (ret) {
syslog(LOG_DEBUG, "krb5_cc_store_cred: %d", (int)ret);
-
- ccname = strdup(krb5_cc_default_name(context));
- if (ccname == NULL)
- syslog(LOG_ERR, "Unable to allocate memory");
-icfk_cleanup:
+ goto icfk_cleanup;
+ }
+out:
my_creds.client = (krb5_principal)0;
krb5_free_cred_contents(context, &my_creds);
if (me)
krb5_free_principal(context, me);
- if (cc)
- krb5_cc_close(context, cc);
if (keytab)
krb5_kt_close(context, keytab);
- return ccname;
+ return cc;
+icfk_cleanup:
+ if (cc) {
+ krb5_cc_close(context, cc);
+ cc = NULL;
+ }
+ goto out;
}
static int
-cifs_krb5_get_req(const char *host, const char *ccname,
+cifs_krb5_get_req(const char *host, krb5_ccache ccache,
DATA_BLOB * mechtoken, DATA_BLOB * sess_key)
{
krb5_error_code ret;
krb5_keyblock *tokb;
- krb5_ccache ccache;
krb5_creds in_creds, *out_creds;
krb5_data apreq_pkt, in_data;
krb5_auth_context auth_context = NULL;
#if defined(HAVE_KRB5_AUTH_CON_SETADDRS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
static const uint8_t gss_cksum[24] = { 0x10, 0x00, /* ... */};
#endif
- if (ccname) {
- ret = krb5_cc_resolve(context, ccname, &ccache);
- if (ret) {
- syslog(LOG_DEBUG, "%s: unable to resolve %s to ccache\n",
- __func__, ccname);
- return ret;
- }
- } else {
- ret = krb5_cc_default(context, &ccache);
- if (ret) {
- syslog(LOG_DEBUG, "%s: krb5_cc_default: %d",
- __func__, (int)ret);
- return ret;
- }
- }
-
memset(&in_creds, 0, sizeof(in_creds));
ret = krb5_cc_get_principal(context, ccache, &in_creds.client);
if (ret) {
syslog(LOG_DEBUG, "%s: unable to get client principal name",
__func__);
- goto out_free_ccache;
+ return ret;
}
ret = krb5_sname_to_principal(context, host, "cifs", KRB5_NT_UNKNOWN,
@@ -383,8 +362,6 @@ out_free_creds:
krb5_free_creds(context, out_creds);
out_free_principal:
krb5_free_principal(context, in_creds.client);
-out_free_ccache:
- krb5_cc_close(context, ccache);
return ret;
}
@@ -410,7 +387,7 @@ out_free_ccache:
*/
static int
handle_krb5_mech(const char *oid, const char *host, DATA_BLOB * secblob,
- DATA_BLOB * sess_key, const char *ccname)
+ DATA_BLOB * sess_key, krb5_ccache ccache)
{
int retval;
DATA_BLOB tkt, tkt_wrapped;
@@ -418,7 +395,7 @@ handle_krb5_mech(const char *oid, const char *host, DATA_BLOB * secblob,
syslog(LOG_DEBUG, "%s: getting service ticket for %s", __func__, host);
/* get a kerberos ticket for the service and extract the session key */
- retval = cifs_krb5_get_req(host, ccname, &tkt, sess_key);
+ retval = cifs_krb5_get_req(host, ccache, &tkt, sess_key);
if (retval) {
syslog(LOG_DEBUG, "%s: failed to obtain service ticket (%d)",
__func__, retval);
@@ -709,12 +686,13 @@ int main(const int argc, char *const argv[])
unsigned int have;
long rc = 1;
int c, try_dns = 0, legacy_uid = 0;
- char *buf, *ccname = NULL;
+ char *buf;
char hostbuf[NI_MAXHOST], *host;
struct decoded_args arg;
const char *oid;
uid_t uid;
char *keytab_name = NULL;
+ krb5_ccache ccache = NULL;
hostbuf[0] = '\0';
memset(&arg, 0, sizeof(arg));
@@ -828,10 +806,15 @@ int main(const int argc, char *const argv[])
goto out;
}
- ccname = get_default_cc();
+ ccache = get_default_cc();
/* Couldn't find credcache? Try to use keytab */
- if (ccname == NULL && arg.username != NULL)
- ccname = init_cc_from_keytab(keytab_name, arg.username);
+ if (ccache == NULL && arg.username != NULL)
+ ccache = init_cc_from_keytab(keytab_name, arg.username);
+
+ if (ccache == NULL) {
+ rc = 1;
+ goto out;
+ }
host = arg.hostname;
@@ -859,7 +842,7 @@ int main(const int argc, char *const argv[])
retry_new_hostname:
lowercase_string(host);
- rc = handle_krb5_mech(oid, host, &secblob, &sess_key, ccname);
+ rc = handle_krb5_mech(oid, host, &secblob, &sess_key, ccache);
if (!rc)
break;
@@ -904,7 +887,7 @@ retry_new_hostname:
break;
}
- rc = handle_krb5_mech(oid, fqdn, &secblob, &sess_key, ccname);
+ rc = handle_krb5_mech(oid, fqdn, &secblob, &sess_key, ccache);
if (!rc)
break;
}
@@ -968,9 +951,10 @@ out:
}
data_blob_free(&secblob);
data_blob_free(&sess_key);
+ if (ccache)
+ krb5_cc_close(context, ccache);
if (context)
krb5_free_context(context);
- SAFE_FREE(ccname);
SAFE_FREE(arg.hostname);
SAFE_FREE(arg.ip);
SAFE_FREE(arg.username);
--
2.7.4
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