Steve French | f1d662a | 2007-11-05 14:38:08 +0000 | [diff] [blame] | 1 | /* |
| 2 | * fs/cifs/cifs_spnego.c -- SPNEGO upcall management for CIFS |
| 3 | * |
| 4 | * Copyright (c) 2007 Red Hat, Inc. |
| 5 | * Author(s): Jeff Layton (jlayton@redhat.com) |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Lesser General Public License as published |
| 9 | * by the Free Software Foundation; either version 2.1 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 15 | * the GNU Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public License |
| 18 | * along with this library; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #include <linux/list.h> |
| 23 | #include <linux/string.h> |
| 24 | #include <keys/user-type.h> |
| 25 | #include <linux/key-type.h> |
| 26 | #include "cifsglob.h" |
| 27 | #include "cifs_spnego.h" |
| 28 | #include "cifs_debug.h" |
| 29 | |
| 30 | /* create a new cifs key */ |
| 31 | static int |
| 32 | cifs_spnego_key_instantiate(struct key *key, const void *data, size_t datalen) |
| 33 | { |
| 34 | char *payload; |
| 35 | int ret; |
| 36 | |
| 37 | ret = -ENOMEM; |
| 38 | payload = kmalloc(datalen, GFP_KERNEL); |
| 39 | if (!payload) |
| 40 | goto error; |
| 41 | |
| 42 | /* attach the data */ |
| 43 | memcpy(payload, data, datalen); |
| 44 | rcu_assign_pointer(key->payload.data, payload); |
| 45 | ret = 0; |
| 46 | |
| 47 | error: |
| 48 | return ret; |
| 49 | } |
| 50 | |
| 51 | static void |
| 52 | cifs_spnego_key_destroy(struct key *key) |
| 53 | { |
| 54 | kfree(key->payload.data); |
| 55 | } |
| 56 | |
| 57 | |
| 58 | /* |
| 59 | * keytype for CIFS spnego keys |
| 60 | */ |
| 61 | struct key_type cifs_spnego_key_type = { |
| 62 | .name = "cifs.spnego", |
| 63 | .instantiate = cifs_spnego_key_instantiate, |
| 64 | .match = user_match, |
| 65 | .destroy = cifs_spnego_key_destroy, |
| 66 | .describe = user_describe, |
| 67 | }; |
| 68 | |
Steve French | 68bf728 | 2007-11-16 18:32:52 +0000 | [diff] [blame] | 69 | #define MAX_VER_STR_LEN 9 /* length of longest version string e.g. |
Steve French | f7a44ea | 2007-11-17 00:01:51 +0000 | [diff] [blame] | 70 | strlen(";ver=0xFF") */ |
Steve French | 68bf728 | 2007-11-16 18:32:52 +0000 | [diff] [blame] | 71 | #define MAX_MECH_STR_LEN 13 /* length of longest security mechanism name, eg |
| 72 | in future could have strlen(";sec=ntlmsspi") */ |
| 73 | #define MAX_IPV6_ADDR_LEN 42 /* eg FEDC:BA98:7654:3210:FEDC:BA98:7654:3210/60 */ |
Steve French | f1d662a | 2007-11-05 14:38:08 +0000 | [diff] [blame] | 74 | /* get a key struct with a SPNEGO security blob, suitable for session setup */ |
| 75 | struct key * |
Jeff Layton | d6c2e4d | 2007-11-16 22:23:17 +0000 | [diff] [blame] | 76 | cifs_get_spnego_key(struct cifsSesInfo *sesInfo) |
Steve French | f1d662a | 2007-11-05 14:38:08 +0000 | [diff] [blame] | 77 | { |
| 78 | struct TCP_Server_Info *server = sesInfo->server; |
| 79 | char *description, *dp; |
| 80 | size_t desc_len; |
| 81 | struct key *spnego_key; |
Jeff Layton | d6c2e4d | 2007-11-16 22:23:17 +0000 | [diff] [blame] | 82 | const char *hostname = server->hostname; |
Steve French | f1d662a | 2007-11-05 14:38:08 +0000 | [diff] [blame] | 83 | |
Steve French | 68bf728 | 2007-11-16 18:32:52 +0000 | [diff] [blame] | 84 | /* BB: come up with better scheme for determining length */ |
| 85 | /* length of fields (with semicolons): ver=0xyz ipv4= ipaddress host= |
| 86 | hostname sec=mechanism uid=0x uid */ |
| 87 | desc_len = MAX_VER_STR_LEN + 5 + MAX_IPV6_ADDR_LEN + 1 + 6 + |
| 88 | strlen(hostname) + MAX_MECH_STR_LEN + 8 + (sizeof(uid_t) * 2); |
Steve French | f1d662a | 2007-11-05 14:38:08 +0000 | [diff] [blame] | 89 | spnego_key = ERR_PTR(-ENOMEM); |
| 90 | description = kzalloc(desc_len, GFP_KERNEL); |
| 91 | if (description == NULL) |
| 92 | goto out; |
| 93 | |
| 94 | dp = description; |
| 95 | /* start with version and hostname portion of UNC string */ |
| 96 | spnego_key = ERR_PTR(-EINVAL); |
Steve French | 68bf728 | 2007-11-16 18:32:52 +0000 | [diff] [blame] | 97 | sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION, |
Steve French | f1d662a | 2007-11-05 14:38:08 +0000 | [diff] [blame] | 98 | hostname); |
| 99 | dp = description + strlen(description); |
| 100 | |
| 101 | /* add the server address */ |
| 102 | if (server->addr.sockAddr.sin_family == AF_INET) |
| 103 | sprintf(dp, "ip4=" NIPQUAD_FMT, |
| 104 | NIPQUAD(server->addr.sockAddr.sin_addr)); |
| 105 | else if (server->addr.sockAddr.sin_family == AF_INET6) |
| 106 | sprintf(dp, "ip6=" NIP6_SEQFMT, |
| 107 | NIP6(server->addr.sockAddr6.sin6_addr)); |
| 108 | else |
| 109 | goto out; |
| 110 | |
| 111 | dp = description + strlen(description); |
| 112 | |
| 113 | /* for now, only sec=krb5 is valid */ |
| 114 | if (server->secType == Kerberos) |
| 115 | sprintf(dp, ";sec=krb5"); |
| 116 | else |
| 117 | goto out; |
| 118 | |
Igor Mammedov | 9eae8a8 | 2007-11-08 16:13:31 +0000 | [diff] [blame] | 119 | dp = description + strlen(description); |
| 120 | sprintf(dp, ";uid=0x%x", sesInfo->linux_uid); |
| 121 | |
Steve French | f1d662a | 2007-11-05 14:38:08 +0000 | [diff] [blame] | 122 | cFYI(1, ("key description = %s", description)); |
| 123 | spnego_key = request_key(&cifs_spnego_key_type, description, ""); |
| 124 | |
Jeff Layton | 05b3de6 | 2007-12-31 00:51:45 +0000 | [diff] [blame] | 125 | #ifdef CONFIG_CIFS_DEBUG2 |
Steve French | f1d662a | 2007-11-05 14:38:08 +0000 | [diff] [blame] | 126 | if (cifsFYI && !IS_ERR(spnego_key)) { |
| 127 | struct cifs_spnego_msg *msg = spnego_key->payload.data; |
Andrew Morton | ead03e3 | 2008-02-05 15:51:24 +0000 | [diff] [blame] | 128 | cifs_dump_mem("SPNEGO reply blob:", msg->data, min(1024U, |
Jeff Layton | 05b3de6 | 2007-12-31 00:51:45 +0000 | [diff] [blame] | 129 | msg->secblob_len + msg->sesskey_len)); |
Steve French | f1d662a | 2007-11-05 14:38:08 +0000 | [diff] [blame] | 130 | } |
Jeff Layton | 05b3de6 | 2007-12-31 00:51:45 +0000 | [diff] [blame] | 131 | #endif /* CONFIG_CIFS_DEBUG2 */ |
Steve French | f1d662a | 2007-11-05 14:38:08 +0000 | [diff] [blame] | 132 | |
| 133 | out: |
| 134 | kfree(description); |
| 135 | return spnego_key; |
| 136 | } |