diff options
Diffstat (limited to 'fs/cifs/cifsencrypt.c')
| -rw-r--r-- | fs/cifs/cifsencrypt.c | 140 |
1 files changed, 131 insertions, 9 deletions
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c index e7d63737e651..a89efaf78a26 100644 --- a/fs/cifs/cifsencrypt.c +++ b/fs/cifs/cifsencrypt.c @@ -26,6 +26,8 @@ #include "md5.h" #include "cifs_unicode.h" #include "cifsproto.h" +#include <linux/ctype.h> +#include <linux/random.h> /* Calculate and return the CIFS signature based on the mac key and the smb pdu */ /* the 16 byte signature must be allocated by the caller */ @@ -35,6 +37,8 @@ extern void mdfour(unsigned char *out, unsigned char *in, int n); extern void E_md4hash(const unsigned char *passwd, unsigned char *p16); +extern void SMBencrypt(unsigned char *passwd, unsigned char *c8, + unsigned char *p24); static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, const char * key, char * signature) @@ -45,7 +49,7 @@ static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, return -EINVAL; MD5Init(&context); - MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16); + MD5Update(&context,key,CIFS_SESS_KEY_SIZE+16); MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length); MD5Final(signature,&context); return 0; @@ -90,7 +94,7 @@ static int cifs_calc_signature2(const struct kvec * iov, int n_vec, return -EINVAL; MD5Init(&context); - MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16); + MD5Update(&context,key,CIFS_SESS_KEY_SIZE+16); for(i=0;i<n_vec;i++) { if(iov[i].iov_base == NULL) { cERROR(1,("null iovec entry")); @@ -204,11 +208,12 @@ int cifs_calculate_mac_key(char * key, const char * rn, const char * password) E_md4hash(password, temp_key); mdfour(key,temp_key,16); - memcpy(key+16,rn, CIFS_SESSION_KEY_SIZE); + memcpy(key+16,rn, CIFS_SESS_KEY_SIZE); return 0; } -int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info) +int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, + const struct nls_table * nls_info) { char temp_hash[16]; struct HMACMD5Context ctx; @@ -225,6 +230,8 @@ int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_ user_name_len = strlen(ses->userName); if(user_name_len > MAX_USERNAME_SIZE) return -EINVAL; + if(ses->domainName == NULL) + return -EINVAL; /* BB should we use CIFS_LINUX_DOM */ dom_name_len = strlen(ses->domainName); if(dom_name_len > MAX_USERNAME_SIZE) return -EINVAL; @@ -259,16 +266,131 @@ int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_ kfree(unicode_buf); return 0; } -void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response) + +#ifdef CONFIG_CIFS_WEAK_PW_HASH +void calc_lanman_hash(struct cifsSesInfo * ses, char * lnm_session_key) +{ + int i; + char password_with_pad[CIFS_ENCPWD_SIZE]; + + if(ses->server == NULL) + return; + + memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); + strncpy(password_with_pad, ses->password, CIFS_ENCPWD_SIZE); + + if((ses->server->secMode & SECMODE_PW_ENCRYPT) == 0) + if(extended_security & CIFSSEC_MAY_PLNTXT) { + memcpy(lnm_session_key, password_with_pad, CIFS_ENCPWD_SIZE); + return; + } + + /* calculate old style session key */ + /* calling toupper is less broken than repeatedly + calling nls_toupper would be since that will never + work for UTF8, but neither handles multibyte code pages + but the only alternative would be converting to UCS-16 (Unicode) + (using a routine something like UniStrupr) then + uppercasing and then converting back from Unicode - which + would only worth doing it if we knew it were utf8. Basically + utf8 and other multibyte codepages each need their own strupper + function since a byte at a time will ont work. */ + + for(i = 0; i < CIFS_ENCPWD_SIZE; i++) { + password_with_pad[i] = toupper(password_with_pad[i]); + } + + SMBencrypt(password_with_pad, ses->server->cryptKey, lnm_session_key); + /* clear password before we return/free memory */ + memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); +} +#endif /* CIFS_WEAK_PW_HASH */ + +static int calc_ntlmv2_hash(struct cifsSesInfo *ses, + const struct nls_table * nls_cp) +{ + int rc = 0; + int len; + char nt_hash[16]; + struct HMACMD5Context * pctxt; + wchar_t * user; + wchar_t * domain; + + pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL); + + if(pctxt == NULL) + return -ENOMEM; + + /* calculate md4 hash of password */ + E_md4hash(ses->password, nt_hash); + + /* convert Domainname to unicode and uppercase */ + hmac_md5_init_limK_to_64(nt_hash, 16, pctxt); + + /* convert ses->userName to unicode and uppercase */ + len = strlen(ses->userName); + user = kmalloc(2 + (len * 2), GFP_KERNEL); + if(user == NULL) + goto calc_exit_2; + len = cifs_strtoUCS(user, ses->userName, len, nls_cp); + UniStrupr(user); + hmac_md5_update((char *)user, 2*len, pctxt); + + /* convert ses->domainName to unicode and uppercase */ + if(ses->domainName) { + len = strlen(ses->domainName); + + domain = kmalloc(2 + (len * 2), GFP_KERNEL); + if(domain == NULL) + goto calc_exit_1; + len = cifs_strtoUCS(domain, ses->domainName, len, nls_cp); + UniStrupr(domain); + + hmac_md5_update((char *)domain, 2*len, pctxt); + + kfree(domain); + } +calc_exit_1: + kfree(user); +calc_exit_2: + /* BB FIXME what about bytes 24 through 40 of the signing key? + compare with the NTLM example */ + hmac_md5_final(ses->server->mac_signing_key, pctxt); + + return rc; +} + +void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf, + const struct nls_table * nls_cp) +{ + int rc; + struct ntlmv2_resp * buf = (struct ntlmv2_resp *)resp_buf; + + buf->blob_signature = cpu_to_le32(0x00000101); + buf->reserved = 0; + buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); + get_random_bytes(&buf->client_chal, sizeof(buf->client_chal)); + buf->reserved2 = 0; + buf->names[0].type = 0; + buf->names[0].length = 0; + + /* calculate buf->ntlmv2_hash */ + rc = calc_ntlmv2_hash(ses, nls_cp); + if(rc) + cERROR(1,("could not get v2 hash rc %d",rc)); + CalcNTLMv2_response(ses, resp_buf); +} + +void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_response) { struct HMACMD5Context context; + /* rest of v2 struct already generated */ memcpy(v2_session_response + 8, ses->server->cryptKey,8); - /* gen_blob(v2_session_response + 16); */ hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context); - hmac_md5_update(ses->server->cryptKey,8,&context); -/* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */ + hmac_md5_update(v2_session_response+8, + sizeof(struct ntlmv2_resp) - 8, &context); hmac_md5_final(v2_session_response,&context); - cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); /* BB removeme BB */ +/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */ } |