SMB1 fixes #399
SMB1 fixes #399
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mmakassikis
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auth.c
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| * @pw_buf: NTLM challenge response | ||
| * @passkey: user password | ||
| * @pw_len: buffer length | ||
| * @cryptkey: buffer length |
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- * @cryptkey: buffer length
+ * @cryptkey: server challenge
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I have applied 3 patches first. I need more time to review "ksmbd: smb1: add buffer validation" patch. |
namjaejeon
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@mmakassikis Sorry for checking "ksmbd: smb1: add buffer validation" patch. I will check it on weekend. |
Okay, I will review this patch on weekend. |
smb1pdu.c
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| pr_err("Unable to strdup() treename or devtype uid %d\n", | ||
| rsp_hdr->Uid); | ||
| offset += offsetof(struct smb_com_tconx_req, Password); | ||
| offset += le16_to_cpu(req->PasswordLength); |
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Have you tested if req->PasswordLength is zero ?
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If req->PasswordLength is zero, offset is unchanged (incidentally, the current code works because req->PasswordLength == le16_to_cpu(req->PasswordLength)).
I don't see what problems can arise with req->PasswordLength.
smb1pdu.c
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| sz = le16_to_cpu(req->SecurityBlobLength); | ||
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| if (offsetof(struct smb_com_session_setup_req, SecurityBlob) + sz > | ||
| get_rfc1002_len(req)) { |
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This check can be moved to smb1misc.c ?
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@mmakassikis When I checked smb1 buffer validation patch, You need to move some of validation codes to smb1misc.c. I think that you can check codes in smb2misc.c |
| struct andx_block *next; | ||
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| /* AndXOffset does not include 4 byte RFC1002 header */ | ||
| len -= 4; |
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Does the "len" include 4-byte RFC1002 header?
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buf is the full request (RFC1002 header, followed by SMB2 header and payload). len should those 4 bytes.
The code here is correct, but the caller code is wrong as it uses get_rfc1002_len() which is the buffer length minus 4.
This mistake is present in most if not all changes in this patch.
smb1pdu.c
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| } | ||
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| offset += oldname_len + 2; | ||
| if (offset > maxlen) { |
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instead of offset > maxlen, offset >= maxlen?
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Yes. Actually, I thought it was ok as we passed a calculated length to smb_get_name(), but if the request is malformed, it's possible to have offset > maxlen, in which case the negative "maxlen - offset" will cause an infinite loop in smb_utf16_bytes().
I will update the patch to check offset >= maxlen before calling smb_get_name().
smb1pdu.c
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| setup_bytes_count = 2 * req->SetupCount; | ||
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| maxlen = get_rfc1002_len(req); | ||
| offset = offsetof(struct smb_com_trans_req, Data); |
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Doesn't 1-byte, smb_com_trans_req.Data[1] need to be considered?
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I don't understand.
Currently, the code parses up to 256 bytes starting from req->Data + setup_bytes_count. My change initializes the offset to req->Data. Whether the Data field is Data[0] or Data[1] doesn't matter, no ?
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3 participants
A few fixes SMB1 fixes:
The first 3 ones small fixes. The last one is big, but it is essentially the same pattern repeated over and over again.
I tried sending to the linux-cifsd-devel list, but it looks like the project has been deleted from sourceforge.