On Friday, April 08, 2011 at 09:48, Jeff Layton wrote:
> On Sun, 27 Mar 2011 14:56:48 +0200
> Oskar Liljeblad <[email protected]> wrote:
>
> > Modify cifs to assume that the supplied password is encoded according to
> > iocharset. Before this patch passwords would be treated as raw 8-bit data,
> > which made authentication with Unicode passwords impossible (at least
> > passwords with characters > 0xFF).
> >
> > The previous code would as a side effect accept passwords encoded with ISO
> > 8859-1, since Unicode < 0x100 basically is ISO 8859-1. Software which
> > relies on that will no longer support password chars > 0x7F unless it also
> > uses iocharset=iso8859-1. (mount.cifs does not care about the encoding so
> > it will work as expected.)
> >
> > Signed-off-by: Oskar Liljeblad <[email protected]>
> > ---
> > fs/cifs/cifsencrypt.c | 8 +++---
> > fs/cifs/cifsproto.h | 8 ++++--
> > fs/cifs/connect.c | 2 +-
> > fs/cifs/sess.c | 2 +-
> > fs/cifs/smbencrypt.c | 60
> > +++++++++----------------------------------------
> > 5 files changed, 22 insertions(+), 58 deletions(-)
> >
> > diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
> > index 5bb4b09..3c1306d 100644
> > --- a/fs/cifs/cifsencrypt.c
> > +++ b/fs/cifs/cifsencrypt.c
> > @@ -226,7 +226,7 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu,
> > }
> >
> > /* first calculate 24 bytes ntlm response and then 16 byte session key */
> > -int setup_ntlm_response(struct cifs_ses *ses)
> > +int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table
> > *nls_cp)
> > {
> > int rc = 0;
> > unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
> > @@ -243,14 +243,14 @@ int setup_ntlm_response(struct cifs_ses *ses)
> > ses->auth_key.len = temp_len;
> >
> > rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
> > - ses->auth_key.response + CIFS_SESS_KEY_SIZE);
> > + ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
> > if (rc) {
> > cFYI(1, "%s Can't generate NTLM response, error: %d",
> > __func__, rc);
> > return rc;
> > }
> >
> > - rc = E_md4hash(ses->password, temp_key);
> > + rc = E_md4hash(ses->password, temp_key, nls_cp);
> > if (rc) {
> > cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
> > return rc;
> > @@ -458,7 +458,7 @@ static int calc_ntlmv2_hash(struct cifs_ses *ses, char
> > *ntlmv2_hash,
> > }
> >
> > /* calculate md4 hash of password */
> > - E_md4hash(ses->password, nt_hash);
> > + E_md4hash(ses->password, nt_hash, nls_cp);
> >
> > crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
> > CIFS_NTHASH_SIZE);
> > diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
> > index e42dc82..fd6d873 100644
> > --- a/fs/cifs/cifsproto.h
> > +++ b/fs/cifs/cifsproto.h
> > @@ -376,8 +376,9 @@ extern int cifs_sign_smb2(struct kvec *iov, int n_vec,
> > struct TCP_Server_Info *,
> > extern int cifs_verify_signature(struct smb_hdr *,
> > struct TCP_Server_Info *server,
> > __u32 expected_sequence_number);
> > -extern int SMBNTencrypt(unsigned char *, unsigned char *, unsigned char *);
> > -extern int setup_ntlm_response(struct cifs_ses *);
> > +extern int SMBNTencrypt(unsigned char *, unsigned char *, unsigned char *,
> > + const struct nls_table *);
> > +extern int setup_ntlm_response(struct cifs_ses *, const struct nls_table
> > *);
> > extern int setup_ntlmv2_rsp(struct cifs_ses *, const struct nls_table *);
> > extern int cifs_crypto_shash_allocate(struct TCP_Server_Info *);
> > extern void cifs_crypto_shash_release(struct TCP_Server_Info *);
> > @@ -429,7 +430,8 @@ extern int CIFSCheckMFSymlink(struct cifs_fattr *fattr,
> > const unsigned char *path,
> > struct cifs_sb_info *cifs_sb, int xid);
> > extern int mdfour(unsigned char *, unsigned char *, int);
> > -extern int E_md4hash(const unsigned char *passwd, unsigned char *p16);
> > +extern int E_md4hash(const unsigned char *passwd, unsigned char *p16,
> > + const struct nls_table *codepage);
> > extern int SMBencrypt(unsigned char *passwd, const unsigned char *c8,
> > unsigned char *p24);
> > #endif /* _CIFSPROTO_H */
> > diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
> > index 96544a4..3c0190f 100644
> > --- a/fs/cifs/connect.c
> > +++ b/fs/cifs/connect.c
> > @@ -3060,7 +3060,7 @@ CIFSTCon(unsigned int xid, struct cifs_ses *ses,
> > else
> > #endif /* CIFS_WEAK_PW_HASH */
> > rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
> > - bcc_ptr);
> > + bcc_ptr, nls_codepage);
> >
> > bcc_ptr += CIFS_AUTH_RESP_SIZE;
> > if (ses->capabilities & CAP_UNICODE) {
> > diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
> > index 6b140e1..17ae0db 100644
> > --- a/fs/cifs/sess.c
> > +++ b/fs/cifs/sess.c
> > @@ -694,7 +694,7 @@ ssetup_ntlmssp_authenticate:
> > cpu_to_le16(CIFS_AUTH_RESP_SIZE);
> >
> > /* calculate ntlm response and session key */
> > - rc = setup_ntlm_response(ses);
> > + rc = setup_ntlm_response(ses, nls_cp);
> > if (rc) {
> > cERROR(1, "Error %d during NTLM authentication", rc);
> > goto ssetup_exit;
> > diff --git a/fs/cifs/smbencrypt.c b/fs/cifs/smbencrypt.c
> > index 1525d5e..92291c1 100644
> > --- a/fs/cifs/smbencrypt.c
> > +++ b/fs/cifs/smbencrypt.c
> > @@ -195,46 +195,13 @@ SMBencrypt(unsigned char *passwd, const unsigned char
> > *c8, unsigned char *p24)
> > return rc;
> > }
> >
> > -/* Routines for Windows NT MD4 Hash functions. */
> > -static int
> > -_my_wcslen(__u16 *str)
> > -{
> > - int len = 0;
> > - while (*str++ != 0)
> > - len++;
> > - return len;
> > -}
> > -
> > -/*
> > - * Convert a string into an NT UNICODE string.
> > - * Note that regardless of processor type
> > - * this must be in intel (little-endian)
> > - * format.
> > - */
> > -
> > -static int
> > -_my_mbstowcs(__u16 *dst, const unsigned char *src, int len)
> > -{ /* BB not a very good conversion routine - change/fix */
> > - int i;
> > - __u16 val;
> > -
> > - for (i = 0; i < len; i++) {
> > - val = *src;
> > - SSVAL(dst, 0, val);
> > - dst++;
> > - src++;
> > - if (val == 0)
> > - break;
> > - }
> > - return i;
> > -}
> > -
> > /*
> > * Creates the MD4 Hash of the users password in NT UNICODE.
> > */
> >
> > int
> > -E_md4hash(const unsigned char *passwd, unsigned char *p16)
> > +E_md4hash(const unsigned char *passwd, unsigned char *p16,
> > + const struct nls_table *codepage)
> > {
> > int rc;
> > int len;
> > @@ -242,20 +209,14 @@ E_md4hash(const unsigned char *passwd, unsigned char
> > *p16)
> >
> > /* Password cannot be longer than 128 characters */
> > if (passwd) {
> > - len = strlen((char *) passwd);
> > - if (len > 128)
> > - len = 128;
> > -
> > /* Password must be converted to NT unicode */
> > - _my_mbstowcs(wpwd, passwd, len);
> > - } else
> > + len = cifs_strtoUCS(wpwd, passwd, 128, codepage);
> > + } else {
> > len = 0;
> > + *wpwd = 0; /* Ensure string is null terminated */
> > + }
> >
> > - wpwd[len] = 0; /* Ensure string is null terminated */
> > - /* Calculate length in bytes */
> > - len = _my_wcslen(wpwd) * sizeof(__u16);
> > -
> > - rc = mdfour(p16, (unsigned char *) wpwd, len);
> > + rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__u16));
> > memset(wpwd, 0, 129 * 2);
> >
> > return rc;
> > @@ -275,7 +236,7 @@ nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16],
> > unsigned char p16[16])
> > memcpy(passwd, pwd, 512);
> > /* Calculate the MD4 hash (NT compatible) of the password */
> > memset(nt_p16, '\0', 16);
> > - E_md4hash(passwd, nt_p16);
> > + E_md4hash(passwd, nt_p16, /* put nls codepage here */);
> ^^^^^^^^^^^^^
> Won't this fail to compile?
Yes, but it's inside a function which is commented out and not compiled. Instead
of adding an extra parameter to the function (which would be required) I
decided just to put a reminder there if that function is ever used in the
future.
#if 0 /* currently unused */
/* Does both the NT and LM owfs of a user's password */
static void
nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16], unsigned char p16[16])
{
char passwd[514];
memset(passwd, '\0', 514);
if (strlen(pwd) < 513)
strcpy(passwd, pwd);
else
memcpy(passwd, pwd, 512);
/* Calculate the MD4 hash (NT compatible) of the password */
memset(nt_p16, '\0', 16);
E_md4hash(passwd, nt_p16, /* put nls codepage here */);
/* Mangle the passwords into Lanman format */
passwd[14] = '\0';
/* strupper(passwd); */
/* Calculate the SMB (lanman) hash functions of the password */
memset(p16, '\0', 16);
E_P16((unsigned char *) passwd, (unsigned char *) p16);
/* clear out local copy of user's password (just being paranoid). */
memset(passwd, '\0', sizeof(passwd));
}
#endif
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