From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 72C941DE4E0; Wed, 19 Mar 2025 14:39:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742395150; cv=none; b=fUIsw41yEQGO9SG+UEP376LBtuunRebw15Elpi29KbtsN9SFYf22qluPjbhkg255UKqjGzEguO6rZUzh/N6kiXPKS8XNU/LWhYBKDQbNJpWG8C73Ax9MGvLVa6BTLNEHpobHpw8hKcSWMZvBOtARRgrwYZXCeSpBGUgSLlZU+so= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742395150; c=relaxed/simple; bh=+5KJTNngA54WDvNL6BCm5X24mb0y4f4xypr6Kt45yVk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NjPb0Q1o3Xc00amtoJd3OkUdMPqF8nS3d0o6htXDxb1IqI7Plv2mUjT4ZJ43dvup+4mZ60lHi+1aUGzGcGrX/5ubXydq1/D1PjQGt6ptIGoboc2UnhasYmuuF9lZo5nPBtjeIqP1f+4neY2aCW36FpqQR7osC2MCIc9vq/LSgow= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wWuUdfZI; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="wWuUdfZI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 45225C4CEE4; Wed, 19 Mar 2025 14:39:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1742395150; bh=+5KJTNngA54WDvNL6BCm5X24mb0y4f4xypr6Kt45yVk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wWuUdfZI8wb8/zUPs/lRDaVPdzF0YJIGkMZPEVEQVJFE4aTRAYiFTG2mKJjLAhH4w 1omM9TlxxE83iUTYv3YD6zHFtf4wg6zZUMKtML0RV0RJVWQ/lArsJLMy6xViDjTXw8 ZShsuxvOzbHxnsfv5dUbMY+n8yN9AvsmM1zozWvU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Steve French , Sasha Levin Subject: [PATCH 6.12 224/231] smb3: add support for IAKerb Date: Wed, 19 Mar 2025 07:31:57 -0700 Message-ID: <20250319143032.371155652@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250319143026.865956961@linuxfoundation.org> References: <20250319143026.865956961@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Steve French [ Upstream commit eea5119fa5979c350af5783a8148eacdd4219715 ] There are now more servers which advertise support for IAKerb (passthrough Kerberos authentication via proxy). IAKerb is a public extension industry standard Kerberos protocol that allows a client without line-of-sight to a Domain Controller to authenticate. There can be cases where we would fail to mount if the server only advertises the OID for IAKerb in SPNEGO/GSSAPI. Add code to allow us to still upcall to userspace in these cases to obtain the Kerberos ticket. Signed-off-by: Steve French Stable-dep-of: 605b249ea967 ("smb: client: Fix match_session bug preventing session reuse") Signed-off-by: Sasha Levin --- fs/smb/client/asn1.c | 2 ++ fs/smb/client/cifs_spnego.c | 4 +++- fs/smb/client/cifsglob.h | 4 ++++ fs/smb/client/sess.c | 3 ++- fs/smb/client/smb2pdu.c | 2 +- 5 files changed, 12 insertions(+), 3 deletions(-) diff --git a/fs/smb/client/asn1.c b/fs/smb/client/asn1.c index b5724ef9f182f..214a44509e7b9 100644 --- a/fs/smb/client/asn1.c +++ b/fs/smb/client/asn1.c @@ -52,6 +52,8 @@ int cifs_neg_token_init_mech_type(void *context, size_t hdrlen, server->sec_kerberos = true; else if (oid == OID_ntlmssp) server->sec_ntlmssp = true; + else if (oid == OID_IAKerb) + server->sec_iakerb = true; else { char buf[50]; diff --git a/fs/smb/client/cifs_spnego.c b/fs/smb/client/cifs_spnego.c index af7849e5974ff..2ad067886ec3f 100644 --- a/fs/smb/client/cifs_spnego.c +++ b/fs/smb/client/cifs_spnego.c @@ -130,11 +130,13 @@ cifs_get_spnego_key(struct cifs_ses *sesInfo, dp = description + strlen(description); - /* for now, only sec=krb5 and sec=mskrb5 are valid */ + /* for now, only sec=krb5 and sec=mskrb5 and iakerb are valid */ if (server->sec_kerberos) sprintf(dp, ";sec=krb5"); else if (server->sec_mskerberos) sprintf(dp, ";sec=mskrb5"); + else if (server->sec_iakerb) + sprintf(dp, ";sec=iakerb"); else { cifs_dbg(VFS, "unknown or missing server auth type, use krb5\n"); sprintf(dp, ";sec=krb5"); diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h index b630beb757a44..a8484af7a2fbc 100644 --- a/fs/smb/client/cifsglob.h +++ b/fs/smb/client/cifsglob.h @@ -151,6 +151,7 @@ enum securityEnum { NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */ RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */ Kerberos, /* Kerberos via SPNEGO */ + IAKerb, /* Kerberos proxy */ }; enum cifs_reparse_type { @@ -743,6 +744,7 @@ struct TCP_Server_Info { bool sec_kerberosu2u; /* supports U2U Kerberos */ bool sec_kerberos; /* supports plain Kerberos */ bool sec_mskerberos; /* supports legacy MS Kerberos */ + bool sec_iakerb; /* supports pass-through auth for Kerberos (krb5 proxy) */ bool large_buf; /* is current buffer large? */ /* use SMBD connection instead of socket */ bool rdma; @@ -2115,6 +2117,8 @@ static inline char *get_security_type_str(enum securityEnum sectype) return "Kerberos"; case NTLMv2: return "NTLMv2"; + case IAKerb: + return "IAKerb"; default: return "Unknown"; } diff --git a/fs/smb/client/sess.c b/fs/smb/client/sess.c index c88e9657f47a8..95e14977baeab 100644 --- a/fs/smb/client/sess.c +++ b/fs/smb/client/sess.c @@ -1263,12 +1263,13 @@ cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) switch (requested) { case Kerberos: case RawNTLMSSP: + case IAKerb: return requested; case Unspecified: if (server->sec_ntlmssp && (global_secflags & CIFSSEC_MAY_NTLMSSP)) return RawNTLMSSP; - if ((server->sec_kerberos || server->sec_mskerberos) && + if ((server->sec_kerberos || server->sec_mskerberos || server->sec_iakerb) && (global_secflags & CIFSSEC_MAY_KRB5)) return Kerberos; fallthrough; diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c index 89a9b8ffe9d92..75b13175a2e78 100644 --- a/fs/smb/client/smb2pdu.c +++ b/fs/smb/client/smb2pdu.c @@ -1435,7 +1435,7 @@ smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) if (server->sec_ntlmssp && (global_secflags & CIFSSEC_MAY_NTLMSSP)) return RawNTLMSSP; - if ((server->sec_kerberos || server->sec_mskerberos) && + if ((server->sec_kerberos || server->sec_mskerberos || server->sec_iakerb) && (global_secflags & CIFSSEC_MAY_KRB5)) return Kerberos; fallthrough; -- 2.39.5