From: Jeff Layton Date: Sun, 26 May 2013 11:00:58 +0000 (-0400) Subject: cifs: move handling of signed connections into separate function X-Git-Tag: next-20130617~99^2~12 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=dc09c62b1d1208cf668eda3dd2222df4031efd5f;p=karo-tx-linux.git cifs: move handling of signed connections into separate function Move the sanity checks for signed connections into a separate function. SMB2's was a cut-and-paste job from CIFS code, so we can make them use the same function. Signed-off-by: Jeff Layton Reviewed-by: Pavel Shilovsky Signed-off-by: Steve French --- diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index dda188a94332..f0e93ffe654c 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -212,6 +212,7 @@ extern int cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses); extern int cifs_setup_session(const unsigned int xid, struct cifs_ses *ses, struct nls_table *nls_info); +extern int cifs_enable_signing(struct TCP_Server_Info *server, unsigned int secFlags); extern int CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses); extern int CIFSTCon(const unsigned int xid, struct cifs_ses *ses, diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 5dd4f8a51e0c..1a3776322c71 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -417,6 +417,38 @@ decode_ext_sec_blob(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr) return 0; } +int +cifs_enable_signing(struct TCP_Server_Info *server, unsigned int secFlags) +{ + if ((secFlags & CIFSSEC_MAY_SIGN) == 0) { + /* MUST_SIGN already includes the MAY_SIGN FLAG + so if this is zero it means that signing is disabled */ + cifs_dbg(FYI, "Signing disabled\n"); + if (server->sec_mode & SECMODE_SIGN_REQUIRED) { + cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n"); + return -EOPNOTSUPP; + } + server->sec_mode &= + ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED); + } else if ((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) { + /* signing required */ + cifs_dbg(FYI, "Must sign - secFlags 0x%x\n", secFlags); + if ((server->sec_mode & + (SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED)) == 0) { + cifs_dbg(VFS, "signing required but server lacks support\n"); + return -EOPNOTSUPP; + } else + server->sec_mode |= SECMODE_SIGN_REQUIRED; + } else { + /* signing optional ie CIFSSEC_MAY_SIGN */ + if ((server->sec_mode & SECMODE_SIGN_REQUIRED) == 0) + server->sec_mode &= + ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED); + } + + return 0; +} + #ifdef CONFIG_CIFS_WEAK_PW_HASH static int decode_lanman_negprot_rsp(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr, @@ -577,10 +609,7 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses) goto neg_err_exit; } else if (pSMBr->hdr.WordCount == 13) { rc = decode_lanman_negprot_rsp(server, pSMBr, secFlags); - if (!rc) - goto signing_check; - else - goto neg_err_exit; + goto signing_check; } else if (pSMBr->hdr.WordCount != 17) { /* unknown wct */ rc = -EOPNOTSUPP; @@ -642,36 +671,9 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses) else server->capabilities &= ~CAP_EXTENDED_SECURITY; - if (rc) - goto neg_err_exit; - signing_check: - if ((secFlags & CIFSSEC_MAY_SIGN) == 0) { - /* MUST_SIGN already includes the MAY_SIGN FLAG - so if this is zero it means that signing is disabled */ - cifs_dbg(FYI, "Signing disabled\n"); - if (server->sec_mode & SECMODE_SIGN_REQUIRED) { - cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n"); - rc = -EOPNOTSUPP; - } - server->sec_mode &= - ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED); - } else if ((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) { - /* signing required */ - cifs_dbg(FYI, "Must sign - secFlags 0x%x\n", secFlags); - if ((server->sec_mode & - (SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED)) == 0) { - cifs_dbg(VFS, "signing required but server lacks support\n"); - rc = -EOPNOTSUPP; - } else - server->sec_mode |= SECMODE_SIGN_REQUIRED; - } else { - /* signing optional ie CIFSSEC_MAY_SIGN */ - if ((server->sec_mode & SECMODE_SIGN_REQUIRED) == 0) - server->sec_mode &= - ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED); - } - + if (!rc) + rc = cifs_enable_signing(server, secFlags); neg_err_exit: cifs_buf_release(pSMB); diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 3af66aa18d3b..ebb97b484ab1 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -423,36 +423,11 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses) } cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags); - if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) { - cifs_dbg(FYI, "Signing required\n"); - if (!(server->sec_mode & (SMB2_NEGOTIATE_SIGNING_REQUIRED | - SMB2_NEGOTIATE_SIGNING_ENABLED))) { - cifs_dbg(VFS, "signing required but server lacks support\n"); - rc = -EOPNOTSUPP; - goto neg_exit; - } - server->sec_mode |= SECMODE_SIGN_REQUIRED; - } else if (sec_flags & CIFSSEC_MAY_SIGN) { - cifs_dbg(FYI, "Signing optional\n"); - if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) { - cifs_dbg(FYI, "Server requires signing\n"); - server->sec_mode |= SECMODE_SIGN_REQUIRED; - } else { - server->sec_mode &= - ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED); - } - } else { - cifs_dbg(FYI, "Signing disabled\n"); - if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) { - cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n"); - rc = -EOPNOTSUPP; - goto neg_exit; - } - server->sec_mode &= - ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED); - } - + rc = cifs_enable_signing(server, sec_flags); #ifdef CONFIG_SMB2_ASN1 /* BB REMOVEME when updated asn1.c ready */ + if (rc) + goto neg_exit; + rc = decode_neg_token_init(security_blob, blob_length, &server->sec_type); if (rc == 1)