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fs/cifs/cifs_spnego.c
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/* * fs/cifs/cifs_spnego.c -- SPNEGO upcall management for CIFS * * Copyright (c) 2007 Red Hat, Inc. * Author(s): Jeff Layton (jlayton@redhat.com) * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/list.h> |
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#include <linux/slab.h> |
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#include <linux/string.h> #include <keys/user-type.h> #include <linux/key-type.h> |
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#include <linux/keyctl.h> |
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#include <linux/inet.h> |
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#include "cifsglob.h" #include "cifs_spnego.h" #include "cifs_debug.h" |
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#include "cifsproto.h" static const struct cred *spnego_cred; |
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/* create a new cifs key */ static int |
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cifs_spnego_key_instantiate(struct key *key, struct key_preparsed_payload *prep) |
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{ char *payload; int ret; ret = -ENOMEM; |
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payload = kmemdup(prep->data, prep->datalen, GFP_KERNEL); |
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if (!payload) goto error; /* attach the data */ |
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key->payload.data[0] = payload; |
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ret = 0; error: return ret; } static void cifs_spnego_key_destroy(struct key *key) { |
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kfree(key->payload.data[0]); |
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} /* * keytype for CIFS spnego keys */ struct key_type cifs_spnego_key_type = { .name = "cifs.spnego", .instantiate = cifs_spnego_key_instantiate, |
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.destroy = cifs_spnego_key_destroy, .describe = user_describe, }; |
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/* length of longest version string e.g. strlen("ver=0xFF") */ #define MAX_VER_STR_LEN 8 /* length of longest security mechanism name, eg in future could have * strlen(";sec=ntlmsspi") */ #define MAX_MECH_STR_LEN 13 |
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/* strlen of "host=" */ #define HOST_KEY_LEN 5 /* strlen of ";ip4=" or ";ip6=" */ #define IP_KEY_LEN 5 /* strlen of ";uid=0x" */ #define UID_KEY_LEN 7 |
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/* strlen of ";creduid=0x" */ #define CREDUID_KEY_LEN 11 |
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/* strlen of ";user=" */ #define USER_KEY_LEN 6 |
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/* strlen of ";pid=0x" */ #define PID_KEY_LEN 7 |
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/* get a key struct with a SPNEGO security blob, suitable for session setup */ struct key * |
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cifs_get_spnego_key(struct cifs_ses *sesInfo) |
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{ struct TCP_Server_Info *server = sesInfo->server; |
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struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr; struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr; |
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char *description, *dp; size_t desc_len; struct key *spnego_key; |
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const char *hostname = server->hostname; |
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const struct cred *saved_cred; |
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/* length of fields (with semicolons): ver=0xyz ip4=ipaddress host=hostname sec=mechanism uid=0xFF user=username */ 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) desc_len += USER_KEY_LEN + strlen(sesInfo->user_name); |
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spnego_key = ERR_PTR(-ENOMEM); description = kzalloc(desc_len, GFP_KERNEL); if (description == NULL) goto out; dp = description; /* start with version and hostname portion of UNC string */ 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); dp = description + strlen(description); /* add the server address */ |
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if (server->dstaddr.ss_family == AF_INET) sprintf(dp, "ip4=%pI4", &sa->sin_addr); else if (server->dstaddr.ss_family == AF_INET6) sprintf(dp, "ip6=%pI6", &sa6->sin6_addr); |
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else goto out; 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 goto out; |
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dp = description + strlen(description); |
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sprintf(dp, ";uid=0x%x", from_kuid_munged(&init_user_ns, sesInfo->linux_uid)); |
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dp = description + strlen(description); |
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sprintf(dp, ";creduid=0x%x", from_kuid_munged(&init_user_ns, sesInfo->cred_uid)); |
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if (sesInfo->user_name) { dp = description + strlen(description); sprintf(dp, ";user=%s", sesInfo->user_name); } |
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dp = description + strlen(description); sprintf(dp, ";pid=0x%x", current->pid); |
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cifs_dbg(FYI, "key description = %s ", description); |
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saved_cred = override_creds(spnego_cred); |
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spnego_key = request_key(&cifs_spnego_key_type, description, ""); |
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revert_creds(saved_cred); |
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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[0]; |
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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: kfree(description); return spnego_key; } |
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int init_cifs_spnego(void) { struct cred *cred; struct key *keyring; int ret; cifs_dbg(FYI, "Registering the %s key type ", cifs_spnego_key_type.name); /* * Create an override credential set with special thread keyring for * spnego upcalls. */ cred = prepare_kernel_cred(NULL); if (!cred) return -ENOMEM; keyring = keyring_alloc(".cifs_spnego", GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ, KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL); if (IS_ERR(keyring)) { ret = PTR_ERR(keyring); goto failed_put_cred; } ret = register_key_type(&cifs_spnego_key_type); if (ret < 0) goto failed_put_key; /* * instruct request_key() to use this special keyring as a cache for * the results it looks up */ set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); cred->thread_keyring = keyring; cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; spnego_cred = cred; cifs_dbg(FYI, "cifs spnego keyring: %d ", key_serial(keyring)); return 0; failed_put_key: key_put(keyring); failed_put_cred: put_cred(cred); return ret; } void exit_cifs_spnego(void) { key_revoke(spnego_cred->thread_keyring); unregister_key_type(&cifs_spnego_key_type); put_cred(spnego_cred); cifs_dbg(FYI, "Unregistered %s key type ", cifs_spnego_key_type.name); } |