1 files changed, 248 insertions, 57 deletions

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 4666780f315d..986709a8d903 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -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 */
+        if (remaining == 0) {
+                /* nothing to do, ignore */
+                cFYI(1, "no more data remains");
                 return 0;
+        }
 
-        total_in_buf2 = get_unaligned_le16(&pSMB2->t2_rsp.DataCount);
-        if (remaining < total_in_buf2) {
+        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_buf2 = (char *)&pSMB2->hdr.Protocol +
-                                get_unaligned_le16(&pSMB2->t2_rsp.DataOffset);
+        /* validate target area */
+        data_area_of_src = (char *)&pSMBs->hdr.Protocol +
+                                get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
 
-        data_area_of_target += total_in_buf;
+        data_area_of_tgt += total_in_tgt;
 
-        /* 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);
@@ -3478,7 +3644,7 @@ CIFSTCon(unsigned int xid, struct cifs_ses *ses,
         if (ses->capabilities & CAP_UNICODE) {
                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
                 length =
-                    cifs_strtoUCS((__le16 *) bcc_ptr, tree,
+                    cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
                         6 /* max utf8 char length in bytes */ *
                         (/* server len*/ + 256 /* share len */), nls_codepage);
                 bcc_ptr += 2 * length;  /* convert num 16 bit words to bytes */
@@ -3533,7 +3699,7 @@ CIFSTCon(unsigned int xid, struct cifs_ses *ses,
 
                 /* mostly informational -- no need to fail on error here */
                 kfree(tcon->nativeFileSystem);
-                tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
+                tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
                                                       bytes_left, is_unicode,
                                                       nls_codepage);
 
@@ -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;