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Merge branch 'master' of git+ssh://git.samba.org/data/git/sfrench/cifs-2.6

This commit is contained in:
Steve French 2012-01-18 15:12:04 -06:00
parent dcd169b761 789b4588da
commit 34f598ca08
8 changed files with 315 additions and 66 deletions
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11
fs/cifs/cifs_debug.c
View File

@ -676,14 +676,23 @@ static ssize_t cifs_multiuser_mount_proc_write(struct file *file,
{
char c;
int rc;
static bool warned;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '0' || c == 'n' || c == 'N')
multiuser_mount = 0;
else if (c == '1' || c == 'y' || c == 'Y')
else if (c == '1' || c == 'y' || c == 'Y') {
multiuser_mount = 1;
if (!warned) {
warned = true;
printk(KERN_WARNING "CIFS VFS: The legacy multiuser "
"mount code is scheduled to be deprecated in "
"3.5. Please switch to using the multiuser "
"mount option.");
}
}
return count;
}

10
fs/cifs/cifs_spnego.c
View File

@ -113,9 +113,11 @@ cifs_get_spnego_key(struct cifs_ses *sesInfo)
MAX_MECH_STR_LEN +
UID_KEY_LEN + (sizeof(uid_t) * 2) +
CREDUID_KEY_LEN + (sizeof(uid_t) * 2) +
USER_KEY_LEN + strlen(sesInfo->user_name) +
PID_KEY_LEN + (sizeof(pid_t) * 2) + 1;
if (sesInfo->user_name)
desc_len += USER_KEY_LEN + strlen(sesInfo->user_name);
spnego_key = ERR_PTR(-ENOMEM);
description = kzalloc(desc_len, GFP_KERNEL);
if (description == NULL)
@ -152,8 +154,10 @@ cifs_get_spnego_key(struct cifs_ses *sesInfo)
dp = description + strlen(description);
sprintf(dp, ";creduid=0x%x", sesInfo->cred_uid);
dp = description + strlen(description);
sprintf(dp, ";user=%s", sesInfo->user_name);
if (sesInfo->user_name) {
dp = description + strlen(description);
sprintf(dp, ";user=%s", sesInfo->user_name);
}
dp = description + strlen(description);
sprintf(dp, ";pid=0x%x", current->pid);

11
fs/cifs/cifsencrypt.c
View File

@ -420,15 +420,20 @@ static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
}
/* convert ses->user_name to unicode and uppercase */
len = strlen(ses->user_name);
len = ses->user_name ? strlen(ses->user_name) : 0;
user = kmalloc(2 + (len * 2), GFP_KERNEL);
if (user == NULL) {
cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
rc = -ENOMEM;
return rc;
}
len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp);
UniStrupr(user);
if (len) {
len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp);
UniStrupr(user);
} else {
memset(user, '\0', 2);
}
rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
(char *)user, 2 * len);

307
fs/cifs/connect.c
View File

@ -38,6 +38,7 @@
#include <asm/processor.h>
#include <linux/inet.h>
#include <linux/module.h>
#include <keys/user-type.h>
#include <net/ipv6.h>
#include "cifspdu.h"
#include "cifsglob.h"
@ -225,74 +226,90 @@ static int check2ndT2(struct smb_hdr *pSMB)
static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
{
struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)psecond;
struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
char *data_area_of_target;
char *data_area_of_buf2;
char *data_area_of_tgt;
char *data_area_of_src;
int remaining;
unsigned int byte_count, total_in_buf;
__u16 total_data_size, total_in_buf2;
unsigned int byte_count, total_in_tgt;
__u16 tgt_total_cnt, src_total_cnt, total_in_src;
total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
if (total_data_size !=
get_unaligned_le16(&pSMB2->t2_rsp.TotalDataCount))
cFYI(1, "total data size of primary and secondary t2 differ");
if (tgt_total_cnt != src_total_cnt)
cFYI(1, "total data count of primary and secondary t2 differ "
"source=%hu target=%hu", src_total_cnt, tgt_total_cnt);
total_in_buf = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
remaining = total_data_size - total_in_buf;
remaining = tgt_total_cnt - total_in_tgt;
if (remaining < 0)
if (remaining < 0) {
cFYI(1, "Server sent too much data. tgt_total_cnt=%hu "
"total_in_tgt=%hu", tgt_total_cnt, total_in_tgt);
return -EPROTO;
if (remaining == 0) /* nothing to do, ignore */
return 0;
total_in_buf2 = get_unaligned_le16(&pSMB2->t2_rsp.DataCount);
if (remaining < total_in_buf2) {
cFYI(1, "transact2 2nd response contains too much data");
}
if (remaining == 0) {
/* nothing to do, ignore */
cFYI(1, "no more data remains");
return 0;
}
total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
if (remaining < total_in_src)
cFYI(1, "transact2 2nd response contains too much data");
/* find end of first SMB data area */
data_area_of_target = (char *)&pSMBt->hdr.Protocol +
data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
/* validate target area */
data_area_of_src = (char *)&pSMBs->hdr.Protocol +
get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
data_area_of_buf2 = (char *)&pSMB2->hdr.Protocol +
get_unaligned_le16(&pSMB2->t2_rsp.DataOffset);
data_area_of_tgt += total_in_tgt;
data_area_of_target += total_in_buf;
/* copy second buffer into end of first buffer */
total_in_buf += total_in_buf2;
total_in_tgt += total_in_src;
/* is the result too big for the field? */
if (total_in_buf > USHRT_MAX)
if (total_in_tgt > USHRT_MAX) {
cFYI(1, "coalesced DataCount too large (%u)", total_in_tgt);
return -EPROTO;
put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);
}
put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
/* fix up the BCC */
byte_count = get_bcc(pTargetSMB);
byte_count += total_in_buf2;
byte_count += total_in_src;
/* is the result too big for the field? */
if (byte_count > USHRT_MAX)
if (byte_count > USHRT_MAX) {
cFYI(1, "coalesced BCC too large (%u)", byte_count);
return -EPROTO;
}
put_bcc(byte_count, pTargetSMB);
byte_count = be32_to_cpu(pTargetSMB->smb_buf_length);
byte_count += total_in_buf2;
byte_count += total_in_src;
/* don't allow buffer to overflow */
if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)
if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
cFYI(1, "coalesced BCC exceeds buffer size (%u)", byte_count);
return -ENOBUFS;
}
pTargetSMB->smb_buf_length = cpu_to_be32(byte_count);
memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
/* copy second buffer into end of first buffer */
memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
if (remaining == total_in_buf2) {
cFYI(1, "found the last secondary response");
return 0; /* we are done */
} else /* more responses to go */
if (remaining != total_in_src) {
/* more responses to go */
cFYI(1, "waiting for more secondary responses");
return 1;
}
/* we are done */
cFYI(1, "found the last secondary response");
return 0;
}
static void
@ -1578,11 +1595,14 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
}
}
if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
cERROR(1, "Multiuser mounts currently require krb5 "
"authentication!");
#ifndef CONFIG_KEYS
/* Muliuser mounts require CONFIG_KEYS support */
if (vol->multiuser) {
cERROR(1, "Multiuser mounts require kernels with "
"CONFIG_KEYS enabled.");
goto cifs_parse_mount_err;
}
#endif
if (vol->UNCip == NULL)
vol->UNCip = &vol->UNC[2];
@ -1981,10 +2001,16 @@ static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
return 0;
break;
default:
/* NULL username means anonymous session */
if (ses->user_name == NULL) {
if (!vol->nullauth)
return 0;
break;
}
/* anything else takes username/password */
if (ses->user_name == NULL)
return 0;
if (strncmp(ses->user_name, vol->username,
if (strncmp(ses->user_name,
vol->username ? vol->username : "",
MAX_USERNAME_SIZE))
return 0;
if (strlen(vol->username) != 0 &&
@ -2039,6 +2065,132 @@ cifs_put_smb_ses(struct cifs_ses *ses)
cifs_put_tcp_session(server);
}
#ifdef CONFIG_KEYS
/* strlen("cifs:a:") + INET6_ADDRSTRLEN + 1 */
#define CIFSCREDS_DESC_SIZE (7 + INET6_ADDRSTRLEN + 1)
/* Populate username and pw fields from keyring if possible */
static int
cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
{
int rc = 0;
char *desc, *delim, *payload;
ssize_t len;
struct key *key;
struct TCP_Server_Info *server = ses->server;
struct sockaddr_in *sa;
struct sockaddr_in6 *sa6;
struct user_key_payload *upayload;
desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
if (!desc)
return -ENOMEM;
/* try to find an address key first */
switch (server->dstaddr.ss_family) {
case AF_INET:
sa = (struct sockaddr_in *)&server->dstaddr;
sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
break;
case AF_INET6:
sa6 = (struct sockaddr_in6 *)&server->dstaddr;
sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
break;
default:
cFYI(1, "Bad ss_family (%hu)", server->dstaddr.ss_family);
rc = -EINVAL;
goto out_err;
}
cFYI(1, "%s: desc=%s", __func__, desc);
key = request_key(&key_type_logon, desc, "");
if (IS_ERR(key)) {
if (!ses->domainName) {
cFYI(1, "domainName is NULL");
rc = PTR_ERR(key);
goto out_err;
}
/* didn't work, try to find a domain key */
sprintf(desc, "cifs:d:%s", ses->domainName);
cFYI(1, "%s: desc=%s", __func__, desc);
key = request_key(&key_type_logon, desc, "");
if (IS_ERR(key)) {
rc = PTR_ERR(key);
goto out_err;
}
}
down_read(&key->sem);
upayload = key->payload.data;
if (IS_ERR_OR_NULL(upayload)) {
rc = PTR_ERR(key);
goto out_key_put;
}
/* find first : in payload */
payload = (char *)upayload->data;
delim = strnchr(payload, upayload->datalen, ':');
cFYI(1, "payload=%s", payload);
if (!delim) {
cFYI(1, "Unable to find ':' in payload (datalen=%d)",
upayload->datalen);
rc = -EINVAL;
goto out_key_put;
}
len = delim - payload;
if (len > MAX_USERNAME_SIZE || len <= 0) {
cFYI(1, "Bad value from username search (len=%ld)", len);
rc = -EINVAL;
goto out_key_put;
}
vol->username = kstrndup(payload, len, GFP_KERNEL);
if (!vol->username) {
cFYI(1, "Unable to allocate %ld bytes for username", len);
rc = -ENOMEM;
goto out_key_put;
}
cFYI(1, "%s: username=%s", __func__, vol->username);
len = key->datalen - (len + 1);
if (len > MAX_PASSWORD_SIZE || len <= 0) {
cFYI(1, "Bad len for password search (len=%ld)", len);
rc = -EINVAL;
kfree(vol->username);
vol->username = NULL;
goto out_key_put;
}
++delim;
vol->password = kstrndup(delim, len, GFP_KERNEL);
if (!vol->password) {
cFYI(1, "Unable to allocate %ld bytes for password", len);
rc = -ENOMEM;
kfree(vol->username);
vol->username = NULL;
goto out_key_put;
}
out_key_put:
up_read(&key->sem);
key_put(key);
out_err:
kfree(desc);
cFYI(1, "%s: returning %d", __func__, rc);
return rc;
}
#else /* ! CONFIG_KEYS */
static inline int
cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
struct cifs_ses *ses __attribute__((unused)))
{
return -ENOSYS;
}
#endif /* CONFIG_KEYS */
static bool warned_on_ntlm; /* globals init to false automatically */
static struct cifs_ses *
@ -2914,18 +3066,33 @@ void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
#define CIFS_DEFAULT_IOSIZE (1024 * 1024)
/*
* Windows only supports a max of 60k reads. Default to that when posix
* extensions aren't in force.
* Windows only supports a max of 60kb reads and 65535 byte writes. Default to
* those values when posix extensions aren't in force. In actuality here, we
* use 65536 to allow for a write that is a multiple of 4k. Most servers seem
* to be ok with the extra byte even though Windows doesn't send writes that
* are that large.
*
* Citation:
*
* http://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
*/
#define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
#define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
static unsigned int
cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
{
__u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
struct TCP_Server_Info *server = tcon->ses->server;
unsigned int wsize = pvolume_info->wsize ? pvolume_info->wsize :
CIFS_DEFAULT_IOSIZE;
unsigned int wsize;
/* start with specified wsize, or default */
if (pvolume_info->wsize)
wsize = pvolume_info->wsize;
else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
wsize = CIFS_DEFAULT_IOSIZE;
else
wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
/* can server support 24-bit write sizes? (via UNIX extensions) */
if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
@ -3136,10 +3303,9 @@ cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
return -EINVAL;
if (volume_info->nullauth) {
cFYI(1, "null user");
volume_info->username = kzalloc(1, GFP_KERNEL);
if (volume_info->username == NULL)
return -ENOMEM;
cFYI(1, "Anonymous login");
kfree(volume_info->username);
volume_info->username = NULL;
} else if (volume_info->username) {
/* BB fixme parse for domain name here */
cFYI(1, "Username: %s", volume_info->username);
@ -3657,16 +3823,38 @@ int cifs_setup_session(unsigned int xid, struct cifs_ses *ses,
return rc;
}
static int
cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
{
switch (ses->server->secType) {
case Kerberos:
vol->secFlg = CIFSSEC_MUST_KRB5;
return 0;
case NTLMv2:
vol->secFlg = CIFSSEC_MUST_NTLMV2;
break;
case NTLM:
vol->secFlg = CIFSSEC_MUST_NTLM;
break;
case RawNTLMSSP:
vol->secFlg = CIFSSEC_MUST_NTLMSSP;
break;
case LANMAN:
vol->secFlg = CIFSSEC_MUST_LANMAN;
break;
}
return cifs_set_cifscreds(vol, ses);
}
static struct cifs_tcon *
cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
{
int rc;
struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
struct cifs_ses *ses;
struct cifs_tcon *tcon = NULL;
struct smb_vol *vol_info;
char username[28]; /* big enough for "krb50x" + hex of ULONG_MAX 6+16 */
/* We used to have this as MAX_USERNAME which is */
/* way too big now (256 instead of 32) */
vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
if (vol_info == NULL) {
@ -3674,8 +3862,6 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
goto out;
}
snprintf(username, sizeof(username), "krb50x%x", fsuid);
vol_info->username = username;
vol_info->local_nls = cifs_sb->local_nls;
vol_info->linux_uid = fsuid;
vol_info->cred_uid = fsuid;
@ -3685,8 +3871,11 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
vol_info->local_lease = master_tcon->local_lease;
vol_info->no_linux_ext = !master_tcon->unix_ext;
/* FIXME: allow for other secFlg settings */
vol_info->secFlg = CIFSSEC_MUST_KRB5;
rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
if (rc) {
tcon = ERR_PTR(rc);
goto out;
}
/* get a reference for the same TCP session */
spin_lock(&cifs_tcp_ses_lock);
@ -3709,6 +3898,8 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
if (ses->capabilities & CAP_UNIX)
reset_cifs_unix_caps(0, tcon, NULL, vol_info);
out:
kfree(vol_info->username);
kfree(vol_info->password);
kfree(vol_info);
return tcon;

3
include/keys/user-type.h
View File

@ -17,7 +17,7 @@
/*****************************************************************************/
/*
* the payload for a key of type "user"
* the payload for a key of type "user" or "logon"
* - once filled in and attached to a key:
* - the payload struct is invariant may not be changed, only replaced
* - the payload must be read with RCU procedures or with the key semaphore
@ -33,6 +33,7 @@ struct user_key_payload {
};
extern struct key_type key_type_user;
extern struct key_type key_type_logon;
extern int user_instantiate(struct key *key, const void *data, size_t datalen);
extern int user_update(struct key *key, const void *data, size_t datalen);

1
security/keys/internal.h
View File

@ -33,6 +33,7 @@
extern struct key_type key_type_dead;
extern struct key_type key_type_user;
extern struct key_type key_type_logon;
/*****************************************************************************/
/*

1
security/keys/key.c
View File

@ -999,6 +999,7 @@ void __init key_init(void)
list_add_tail(&key_type_keyring.link, &key_types_list);
list_add_tail(&key_type_dead.link, &key_types_list);
list_add_tail(&key_type_user.link, &key_types_list);
list_add_tail(&key_type_logon.link, &key_types_list);
/* record the root user tracking */
rb_link_node(&root_key_user.node,

37
security/keys/user_defined.c
View File

@ -18,6 +18,8 @@
#include <asm/uaccess.h>
#include "internal.h"
static int logon_vet_description(const char *desc);
/*
* user defined keys take an arbitrary string as the description and an
* arbitrary blob of data as the payload
@ -35,6 +37,24 @@ struct key_type key_type_user = {
EXPORT_SYMBOL_GPL(key_type_user);
/*
* This key type is essentially the same as key_type_user, but it does
* not define a .read op. This is suitable for storing username and
* password pairs in the keyring that you do not want to be readable
* from userspace.
*/
struct key_type key_type_logon = {
.name = "logon",
.instantiate = user_instantiate,
.update = user_update,
.match = user_match,
.revoke = user_revoke,
.destroy = user_destroy,
.describe = user_describe,
.vet_description = logon_vet_description,
};
EXPORT_SYMBOL_GPL(key_type_logon);
/*
* instantiate a user defined key
*/
@ -189,3 +209,20 @@ long user_read(const struct key *key, char __user *buffer, size_t buflen)
}
EXPORT_SYMBOL_GPL(user_read);
/* Vet the description for a "logon" key */
static int logon_vet_description(const char *desc)
{
char *p;
/* require a "qualified" description string */
p = strchr(desc, ':');
if (!p)
return -EINVAL;
/* also reject description with ':' as first char */
if (p == desc)
return -EINVAL;
return 0;
}