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[209.132.180.67]) by mx.google.com with ESMTP id w21si167681otp.93.2020.03.25.14.34.48; Wed, 25 Mar 2020 14:35:00 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-nfs-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2020-01-29 header.b=pk8MKv98; spf=pass (google.com: best guess record for domain of linux-nfs-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-nfs-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727376AbgCYVeo (ORCPT + 99 others); Wed, 25 Mar 2020 17:34:44 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:50046 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726081AbgCYVen (ORCPT ); Wed, 25 Mar 2020 17:34:43 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 02PLYIvm088042; Wed, 25 Mar 2020 21:34:38 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=content-type : mime-version : subject : from : in-reply-to : date : cc : content-transfer-encoding : message-id : references : to; s=corp-2020-01-29; bh=EhN3gW+gy6LbsughxLMsMI28ZLpN86VPn5FfNOGn9cc=; b=pk8MKv98U4+Feaf9t/vVjayBezq9jKHRjL1Bv8u811zfIkxVgrOSRHOmMuM4+0bHCvMK jiCS3FdU8f4f1PTHJHDDXaUrLGupT7KILkQqZ7oDu8k0jkgmb18/wWIiPkE6Vo/liNKe DpmY1u0Xf7JnrP8IHsqNbv4hq4j9FLwxNmfLEUIb5ZsUfI8FO+FGey04BezAF1GVsYVb 5ql+m+59Xl4/jA5EByD7JEAcRR4d/qnTEt2iJD5pvJgH7P8QtL2RJ9kMFetBB24MT6Ov xT87K3AH89eeWlQdCUlJYC/u7kN+hBPdyJjZb73xJNRfBTwyMF9Oq/Tz7Rx+01pUG7ZK Eg== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2120.oracle.com with ESMTP id 3005kvb9u2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 25 Mar 2020 21:34:38 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 02PLXdaG036054; Wed, 25 Mar 2020 21:34:38 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 3003gjgq5m-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 25 Mar 2020 21:34:37 +0000 Received: from abhmp0003.oracle.com (abhmp0003.oracle.com [141.146.116.9]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 02PLYVgv004563; Wed, 25 Mar 2020 21:34:31 GMT Received: from anon-dhcp-153.1015granger.net (/68.61.232.219) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 25 Mar 2020 14:34:30 -0700 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Subject: Re: [PATCH 1/1] SUNRPC: fix krb5p mount to provide large enough buffer in rq_rcvsize From: Chuck Lever In-Reply-To: <20200325210136.2826-1-olga.kornievskaia@gmail.com> Date: Wed, 25 Mar 2020 17:34:29 -0400 Cc: trond.myklebust@hammerspace.com, Anna Schumaker , Linux NFS Mailing List Content-Transfer-Encoding: quoted-printable Message-Id: References: <20200325210136.2826-1-olga.kornievskaia@gmail.com> To: Olga Kornievskaia X-Mailer: Apple Mail (2.3445.104.11) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9571 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 mlxlogscore=999 bulkscore=0 phishscore=0 adultscore=0 spamscore=0 malwarescore=0 suspectscore=2 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003250166 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9571 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 bulkscore=0 phishscore=0 suspectscore=2 impostorscore=0 spamscore=0 adultscore=0 priorityscore=1501 mlxlogscore=999 lowpriorityscore=0 mlxscore=0 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003250166 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org > On Mar 25, 2020, at 5:01 PM, Olga Kornievskaia = wrote: >=20 > From: Olga Kornievskaia >=20 > Ever since commit 2c94b8eca1a2 ("SUNRPC: Use au_rslack when computing > reply buffer size"). It changed how "req->rq_rcvsize" is calculated. = It > used to use au_cslack value which was nice and large and changed it to > au_rslack value which turns out to be too small. >=20 > Since 5.1, v3 mount with sec=3Dkrb5p fails against an Ontap server > because client's receive buffer it too small. >=20 > For gss krb5p, we need to account for the mic token in the verifier, > and the wrap token in the wrap token. >=20 > RFC 4121 defines: > mic token > Octet no Name Description > -------------------------------------------------------------- > 0..1 TOK_ID Identification field. Tokens emitted by > GSS_GetMIC() contain the hex value 04 04 > expressed in big-endian order in this > field. > 2 Flags Attributes field, as described in section > 4.2.2. > 3..7 Filler Contains five octets of hex value FF. > 8..15 SND_SEQ Sequence number field in clear text, > expressed in big-endian order. > 16..last SGN_CKSUM Checksum of the "to-be-signed" data and > octet 0..15, as described in section = 4.2.4. >=20 > that's 16bytes (GSS_KRB5_TOK_HDR_LEN) + chksum >=20 > wrap token > Octet no Name Description > -------------------------------------------------------------- > 0..1 TOK_ID Identification field. Tokens emitted by > GSS_Wrap() contain the hex value 05 04 > expressed in big-endian order in this > field. > 2 Flags Attributes field, as described in section > 4.2.2. > 3 Filler Contains the hex value FF. > 4..5 EC Contains the "extra count" field, in big- > endian order as described in section = 4.2.3. > 6..7 RRC Contains the "right rotation count" in = big- > endian order, as described in section > 4.2.5. > 8..15 SND_SEQ Sequence number field in clear text, > expressed in big-endian order. > 16..last Data Encrypted data for Wrap tokens with > confidentiality, or plaintext data = followed > by the checksum for Wrap tokens without > confidentiality, as described in section > 4.2.4. >=20 > Also 16bytes of header (GSS_KRB5_TOK_HDR_LEN), encrypted data, and = cksum > (other things like padding) >=20 > RFC 3961 defines known cksum sizes: > Checksum type sumtype checksum section or > value size reference > = --------------------------------------------------------------------- > CRC32 1 4 6.1.3 > rsa-md4 2 16 6.1.2 > rsa-md4-des 3 24 6.2.5 > des-mac 4 16 6.2.7 > des-mac-k 5 8 6.2.8 > rsa-md4-des-k 6 16 6.2.6 > rsa-md5 7 16 6.1.1 > rsa-md5-des 8 24 6.2.4 > rsa-md5-des3 9 24 ?? > sha1 (unkeyed) 10 20 ?? > hmac-sha1-des3-kd 12 20 6.3 > hmac-sha1-des3 13 20 ?? > sha1 (unkeyed) 14 20 ?? > hmac-sha1-96-aes128 15 20 = [KRB5-AES] > hmac-sha1-96-aes256 16 20 = [KRB5-AES] > [reserved] 0x8003 ? = [GSS-KRB5] >=20 > Linux kernel now mainly supports type 15,16 so max cksum size is = 20bytes. > (GSS_KRB5_MAX_CKSUM_LEN) >=20 > Re-use already existing define of GSS_KRB5_MAX_SLACK_NEEDED that's = used > for encoding the gss_wrap tokens (same tokens are used in reply). >=20 > Fixes: 2c94b8eca1a2 ("SUNRPC: Use au_rslack when computing reply = buffer size") > Signed-off-by: Olga Kornievskaia > --- > net/sunrpc/auth_gss/auth_gss.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) >=20 > diff --git a/net/sunrpc/auth_gss/auth_gss.c = b/net/sunrpc/auth_gss/auth_gss.c > index 24ca861..5a733a6 100644 > --- a/net/sunrpc/auth_gss/auth_gss.c > +++ b/net/sunrpc/auth_gss/auth_gss.c > @@ -20,6 +20,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -51,6 +52,8 @@ > /* length of a krb5 verifier (48), plus data added before arguments = when > * using integrity (two 4-byte integers): */ > #define GSS_VERF_SLACK 100 > +/* covers lengths of gss_unwrap() extra kerberos mic and wrap token = */ > +#define GSS_RESP_SLACK (GSS_KRB5_MAX_SLACK_NEEDED << 2) GSS_KRB5_MAX_SLACK_NEEDED is already in bytes. Shouldn't need the "<< 2" = here. > static DEFINE_HASHTABLE(gss_auth_hash_table, 4); > static DEFINE_SPINLOCK(gss_auth_hash_lock); > @@ -1050,7 +1053,7 @@ static void gss_pipe_free(struct gss_pipe *p) > goto err_put_mech; > auth =3D &gss_auth->rpc_auth; > auth->au_cslack =3D GSS_CRED_SLACK >> 2; > - auth->au_rslack =3D GSS_VERF_SLACK >> 2; > + auth->au_rslack =3D GSS_RESP_SLACK >> 2; > auth->au_verfsize =3D GSS_VERF_SLACK >> 2; > auth->au_ralign =3D GSS_VERF_SLACK >> 2; > auth->au_flags =3D 0; > --=20 > 1.8.3.1 >=20 -- Chuck Lever