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cf7f601c06
Give the key type the opportunity to preparse the payload prior to the
instantiation and update routines being called. This is done with the
provision of two new key type operations:
int (*preparse)(struct key_preparsed_payload *prep);
void (*free_preparse)(struct key_preparsed_payload *prep);
If the first operation is present, then it is called before key creation (in
the add/update case) or before the key semaphore is taken (in the update and
instantiate cases). The second operation is called to clean up if the first
was called.
preparse() is given the opportunity to fill in the following structure:
struct key_preparsed_payload {
char *description;
void *type_data[2];
void *payload;
const void *data;
size_t datalen;
size_t quotalen;
};
Before the preparser is called, the first three fields will have been cleared,
the payload pointer and size will be stored in data and datalen and the default
quota size from the key_type struct will be stored into quotalen.
The preparser may parse the payload in any way it likes and may store data in
the type_data[] and payload fields for use by the instantiate() and update()
ops.
The preparser may also propose a description for the key by attaching it as a
string to the description field. This can be used by passing a NULL or ""
description to the add_key() system call or the key_create_or_update()
function. This cannot work with request_key() as that required the description
to tell the upcall about the key to be created.
This, for example permits keys that store PGP public keys to generate their own
name from the user ID and public key fingerprint in the key.
The instantiate() and update() operations are then modified to look like this:
int (*instantiate)(struct key *key, struct key_preparsed_payload *prep);
int (*update)(struct key *key, struct key_preparsed_payload *prep);
and the new payload data is passed in *prep, whether or not it was preparsed.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
180 lines
4.8 KiB
C
180 lines
4.8 KiB
C
/*
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* fs/cifs/cifs_spnego.c -- SPNEGO upcall management for CIFS
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*
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* Copyright (c) 2007 Red Hat, Inc.
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* Author(s): Jeff Layton (jlayton@redhat.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <keys/user-type.h>
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#include <linux/key-type.h>
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#include <linux/inet.h>
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#include "cifsglob.h"
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#include "cifs_spnego.h"
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#include "cifs_debug.h"
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/* create a new cifs key */
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static int
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cifs_spnego_key_instantiate(struct key *key, struct key_preparsed_payload *prep)
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{
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char *payload;
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int ret;
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ret = -ENOMEM;
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payload = kmalloc(prep->datalen, GFP_KERNEL);
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if (!payload)
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goto error;
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/* attach the data */
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memcpy(payload, prep->data, prep->datalen);
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key->payload.data = payload;
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ret = 0;
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error:
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return ret;
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}
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static void
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cifs_spnego_key_destroy(struct key *key)
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{
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kfree(key->payload.data);
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}
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/*
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* keytype for CIFS spnego keys
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*/
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struct key_type cifs_spnego_key_type = {
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.name = "cifs.spnego",
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.instantiate = cifs_spnego_key_instantiate,
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.match = user_match,
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.destroy = cifs_spnego_key_destroy,
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.describe = user_describe,
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};
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/* length of longest version string e.g. strlen("ver=0xFF") */
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#define MAX_VER_STR_LEN 8
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/* length of longest security mechanism name, eg in future could have
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* strlen(";sec=ntlmsspi") */
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#define MAX_MECH_STR_LEN 13
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/* strlen of "host=" */
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#define HOST_KEY_LEN 5
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/* strlen of ";ip4=" or ";ip6=" */
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#define IP_KEY_LEN 5
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/* strlen of ";uid=0x" */
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#define UID_KEY_LEN 7
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/* strlen of ";creduid=0x" */
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#define CREDUID_KEY_LEN 11
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/* strlen of ";user=" */
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#define USER_KEY_LEN 6
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/* strlen of ";pid=0x" */
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#define PID_KEY_LEN 7
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/* get a key struct with a SPNEGO security blob, suitable for session setup */
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struct key *
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cifs_get_spnego_key(struct cifs_ses *sesInfo)
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{
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struct TCP_Server_Info *server = sesInfo->server;
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struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
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struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
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char *description, *dp;
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size_t desc_len;
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struct key *spnego_key;
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const char *hostname = server->hostname;
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/* length of fields (with semicolons): ver=0xyz ip4=ipaddress
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host=hostname sec=mechanism uid=0xFF user=username */
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desc_len = MAX_VER_STR_LEN +
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HOST_KEY_LEN + strlen(hostname) +
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IP_KEY_LEN + INET6_ADDRSTRLEN +
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MAX_MECH_STR_LEN +
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UID_KEY_LEN + (sizeof(uid_t) * 2) +
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CREDUID_KEY_LEN + (sizeof(uid_t) * 2) +
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PID_KEY_LEN + (sizeof(pid_t) * 2) + 1;
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if (sesInfo->user_name)
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desc_len += USER_KEY_LEN + strlen(sesInfo->user_name);
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spnego_key = ERR_PTR(-ENOMEM);
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description = kzalloc(desc_len, GFP_KERNEL);
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if (description == NULL)
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goto out;
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dp = description;
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/* start with version and hostname portion of UNC string */
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spnego_key = ERR_PTR(-EINVAL);
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sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
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hostname);
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dp = description + strlen(description);
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/* add the server address */
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if (server->dstaddr.ss_family == AF_INET)
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sprintf(dp, "ip4=%pI4", &sa->sin_addr);
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else if (server->dstaddr.ss_family == AF_INET6)
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sprintf(dp, "ip6=%pI6", &sa6->sin6_addr);
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else
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goto out;
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dp = description + strlen(description);
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/* for now, only sec=krb5 and sec=mskrb5 are valid */
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if (server->sec_kerberos)
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sprintf(dp, ";sec=krb5");
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else if (server->sec_mskerberos)
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sprintf(dp, ";sec=mskrb5");
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else
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goto out;
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dp = description + strlen(description);
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sprintf(dp, ";uid=0x%x", sesInfo->linux_uid);
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dp = description + strlen(description);
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sprintf(dp, ";creduid=0x%x", sesInfo->cred_uid);
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if (sesInfo->user_name) {
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dp = description + strlen(description);
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sprintf(dp, ";user=%s", sesInfo->user_name);
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}
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dp = description + strlen(description);
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sprintf(dp, ";pid=0x%x", current->pid);
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cFYI(1, "key description = %s", description);
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spnego_key = request_key(&cifs_spnego_key_type, description, "");
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#ifdef CONFIG_CIFS_DEBUG2
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if (cifsFYI && !IS_ERR(spnego_key)) {
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struct cifs_spnego_msg *msg = spnego_key->payload.data;
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cifs_dump_mem("SPNEGO reply blob:", msg->data, min(1024U,
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msg->secblob_len + msg->sesskey_len));
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}
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#endif /* CONFIG_CIFS_DEBUG2 */
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out:
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kfree(description);
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return spnego_key;
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}
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