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Diffstat (limited to 'source3/auth/auth_util.c')
| -rw-r--r-- | source3/auth/auth_util.c | 685 |
1 files changed, 685 insertions, 0 deletions
diff --git a/source3/auth/auth_util.c b/source3/auth/auth_util.c new file mode 100644 index 0000000000..d80c927c19 --- /dev/null +++ b/source3/auth/auth_util.c @@ -0,0 +1,685 @@ +/* + Unix SMB/CIFS implementation. + Authentication utility functions + Copyright (C) Andrew Tridgell 1992-1998 + Copyright (C) Andrew Bartlett 2001 + Copyright (C) Jeremy Allison 2000-2001 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" + +extern fstring remote_machine; +extern pstring global_myname; + +/**************************************************************************** + Create a UNIX user on demand. +****************************************************************************/ + +static int smb_create_user(const char *unix_user, const char *homedir) +{ + pstring add_script; + int ret; + + pstrcpy(add_script, lp_adduser_script()); + if (! *add_script) + return -1; + all_string_sub(add_script, "%u", unix_user, sizeof(pstring)); + if (homedir) + all_string_sub(add_script, "%H", homedir, sizeof(pstring)); + ret = smbrun(add_script,NULL); + DEBUG(3,("smb_create_user: Running the command `%s' gave %d\n",add_script,ret)); + return ret; +} + +/**************************************************************************** + Delete a UNIX user on demand. +****************************************************************************/ + +int smb_delete_user(const char *unix_user) +{ + pstring del_script; + int ret; + + pstrcpy(del_script, lp_deluser_script()); + if (! *del_script) + return -1; + all_string_sub(del_script, "%u", unix_user, sizeof(pstring)); + ret = smbrun(del_script,NULL); + DEBUG(3,("smb_delete_user: Running the command `%s' gave %d\n",del_script,ret)); + return ret; +} + +/**************************************************************************** + Add and Delete UNIX users on demand, based on NTSTATUS codes. +****************************************************************************/ + +void smb_user_control(const auth_usersupplied_info *user_info, auth_serversupplied_info *server_info, NTSTATUS nt_status) +{ + struct passwd *pwd=NULL; + + if (NT_STATUS_IS_OK(nt_status)) { + + if (!(server_info->sam_fill_level & SAM_FILL_UNIX)) { + + /* + * User validated ok against Domain controller. + * If the admin wants us to try and create a UNIX + * user on the fly, do so. + */ + + if(lp_adduser_script() && !(pwd = Get_Pwnam(user_info->internal_username.str))) { + smb_create_user(user_info->internal_username.str, NULL); + } + } + } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) { + /* + * User failed to validate ok against Domain controller. + * If the failure was "user doesn't exist" and admin + * wants us to try and delete that UNIX user on the fly, + * do so. + */ + if (lp_deluser_script()) { + smb_delete_user(user_info->internal_username.str); + } + } +} + +/**************************************************************************** + Create an auth_usersupplied_data structure +****************************************************************************/ + +static BOOL make_user_info(auth_usersupplied_info **user_info, + const char *smb_name, + const char *internal_username, + const char *client_domain, + const char *domain, + const char *wksta_name, + DATA_BLOB lm_pwd, DATA_BLOB nt_pwd, + DATA_BLOB plaintext, + uint32 auth_flags, BOOL encrypted) +{ + + DEBUG(5,("attempting to make a user_info for %s (%s)\n", internal_username, smb_name)); + + *user_info = malloc(sizeof(**user_info)); + if (!user_info) { + DEBUG(0,("malloc failed for user_info (size %d)\n", sizeof(*user_info))); + return False; + } + + ZERO_STRUCTP(*user_info); + + DEBUG(5,("making strings for %s's user_info struct\n", internal_username)); + + (*user_info)->smb_name.str = strdup(smb_name); + if ((*user_info)->smb_name.str) { + (*user_info)->smb_name.len = strlen(smb_name); + } else { + free_user_info(user_info); + return False; + } + + (*user_info)->internal_username.str = strdup(internal_username); + if ((*user_info)->internal_username.str) { + (*user_info)->internal_username.len = strlen(internal_username); + } else { + free_user_info(user_info); + return False; + } + + (*user_info)->domain.str = strdup(domain); + if ((*user_info)->domain.str) { + (*user_info)->domain.len = strlen(domain); + } else { + free_user_info(user_info); + return False; + } + + (*user_info)->client_domain.str = strdup(client_domain); + if ((*user_info)->client_domain.str) { + (*user_info)->client_domain.len = strlen(client_domain); + } else { + free_user_info(user_info); + return False; + } + + (*user_info)->wksta_name.str = strdup(wksta_name); + if ((*user_info)->wksta_name.str) { + (*user_info)->wksta_name.len = strlen(wksta_name); + } else { + free_user_info(user_info); + return False; + } + + DEBUG(5,("makeing blobs for %s's user_info struct\n", internal_username)); + + (*user_info)->lm_resp = data_blob(lm_pwd.data, lm_pwd.length); + (*user_info)->nt_resp = data_blob(nt_pwd.data, nt_pwd.length); + (*user_info)->plaintext_password = data_blob(plaintext.data, plaintext.length); + + (*user_info)->encrypted = encrypted; + (*user_info)->auth_flags = auth_flags; + + DEBUG(10,("made an %sencrypted user_info for %s (%s)\n", encrypted ? "":"un" , internal_username, smb_name)); + + return True; +} + +/**************************************************************************** + Create an auth_usersupplied_data structure after appropriate mapping. +****************************************************************************/ + +BOOL make_user_info_map(auth_usersupplied_info **user_info, + const char *smb_name, + const char *client_domain, + const char *wksta_name, + DATA_BLOB lm_pwd, DATA_BLOB nt_pwd, + DATA_BLOB plaintext, + uint32 ntlmssp_flags, BOOL encrypted) +{ + const char *domain; + fstring internal_username; + fstrcpy(internal_username, smb_name); + map_username(internal_username); + + DEBUG(5, ("make_user_info_map: Mapping user [%s]\\[%s] from workstation [%s]\n", + client_domain, smb_name, wksta_name)); + + if (lp_allow_trusted_domains() && *client_domain) { + + /* the client could have given us a workstation name + or other crap for the workgroup - we really need a + way of telling if this domain name is one of our + trusted domain names + + Also don't allow "" as a domain, fixes a Win9X bug + where it doens't supply a domain for logon script + 'net use' commands. + + The way I do it here is by checking if the fully + qualified username exists. This is rather reliant + on winbind, but until we have a better method this + will have to do + */ + + domain = client_domain; + + if ((smb_name) && (*smb_name)) { /* Don't do this for guests */ + char *user = NULL; + if (asprintf(&user, "%s%s%s", + client_domain, lp_winbind_separator(), + smb_name) < 0) { + DEBUG(0, ("make_user_info_map: asprintf() failed!\n")); + return False; + } + + DEBUG(5, ("make_user_info_map: testing for user %s\n", user)); + + if (Get_Pwnam(user) == NULL) { + DEBUG(5, ("make_user_info_map: test for user %s failed\n", user)); + domain = lp_workgroup(); + DEBUG(5, ("make_user_info_map: trusted domain %s doesn't appear to exist, using %s\n", + client_domain, domain)); + } else { + DEBUG(5, ("make_user_info_map: using trusted domain %s\n", domain)); + } + SAFE_FREE(user); + } + } else { + domain = lp_workgroup(); + } + + return make_user_info(user_info, + smb_name, internal_username, + client_domain, domain, + wksta_name, + lm_pwd, nt_pwd, + plaintext, + ntlmssp_flags, encrypted); + +} + +/**************************************************************************** + Create an auth_usersupplied_data, making the DATA_BLOBs here. + Decrypt and encrypt the passwords. +****************************************************************************/ + +BOOL make_user_info_netlogon_network(auth_usersupplied_info **user_info, + const char *smb_name, + const char *client_domain, + const char *wksta_name, + const uchar *lm_network_pwd, int lm_pwd_len, + const uchar *nt_network_pwd, int nt_pwd_len) +{ + BOOL ret; + DATA_BLOB lm_blob = data_blob(lm_network_pwd, lm_pwd_len); + DATA_BLOB nt_blob = data_blob(nt_network_pwd, nt_pwd_len); + DATA_BLOB plaintext_blob = data_blob(NULL, 0); + uint32 auth_flags = AUTH_FLAG_NONE; + + if (lm_pwd_len) + auth_flags |= AUTH_FLAG_LM_RESP; + if (nt_pwd_len == 24) { + auth_flags |= AUTH_FLAG_NTLM_RESP; + } else if (nt_pwd_len != 0) { + auth_flags |= AUTH_FLAG_NTLMv2_RESP; + } + + ret = make_user_info_map(user_info, + smb_name, client_domain, + wksta_name, + lm_blob, nt_blob, + plaintext_blob, + auth_flags, True); + + data_blob_free(&lm_blob); + data_blob_free(&nt_blob); + return ret; +} + +/**************************************************************************** + Create an auth_usersupplied_data, making the DATA_BLOBs here. + Decrypt and encrypt the passwords. +****************************************************************************/ + +BOOL make_user_info_netlogon_interactive(auth_usersupplied_info **user_info, + const char *smb_name, + const char *client_domain, + const char *wksta_name, + const uchar chal[8], + const uchar lm_interactive_pwd[16], + const uchar nt_interactive_pwd[16], + const uchar *dc_sess_key) +{ + char lm_pwd[16]; + char nt_pwd[16]; + unsigned char local_lm_response[24]; + unsigned char local_nt_response[24]; + unsigned char key[16]; + uint32 auth_flags = AUTH_FLAG_NONE; + + ZERO_STRUCT(key); + memcpy(key, dc_sess_key, 8); + + if (lm_interactive_pwd) memcpy(lm_pwd, lm_interactive_pwd, sizeof(lm_pwd)); + if (nt_interactive_pwd) memcpy(nt_pwd, nt_interactive_pwd, sizeof(nt_pwd)); + +#ifdef DEBUG_PASSWORD + DEBUG(100,("key:")); + dump_data(100, (char *)key, sizeof(key)); + + DEBUG(100,("lm owf password:")); + dump_data(100, lm_pwd, sizeof(lm_pwd)); + + DEBUG(100,("nt owf password:")); + dump_data(100, nt_pwd, sizeof(nt_pwd)); +#endif + + SamOEMhash((uchar *)lm_pwd, key, sizeof(lm_pwd)); + SamOEMhash((uchar *)nt_pwd, key, sizeof(nt_pwd)); + +#ifdef DEBUG_PASSWORD + DEBUG(100,("decrypt of lm owf password:")); + dump_data(100, lm_pwd, sizeof(lm_pwd)); + + DEBUG(100,("decrypt of nt owf password:")); + dump_data(100, nt_pwd, sizeof(nt_pwd)); +#endif + + SMBOWFencrypt((const unsigned char *)lm_pwd, chal, local_lm_response); + SMBOWFencrypt((const unsigned char *)nt_pwd, chal, local_nt_response); + + /* Password info paranoia */ + ZERO_STRUCT(lm_pwd); + ZERO_STRUCT(nt_pwd); + ZERO_STRUCT(key); + + { + BOOL ret; + DATA_BLOB local_lm_blob = data_blob(local_lm_response, sizeof(local_lm_response)); + DATA_BLOB local_nt_blob = data_blob(local_nt_response, sizeof(local_nt_response)); + DATA_BLOB plaintext_blob = data_blob(NULL, 0); + + if (lm_interactive_pwd) + auth_flags |= AUTH_FLAG_LM_RESP; + if (nt_interactive_pwd) + auth_flags |= AUTH_FLAG_NTLM_RESP; + + ret = make_user_info_map(user_info, + smb_name, client_domain, + wksta_name, + local_lm_blob, + local_nt_blob, + plaintext_blob, + auth_flags, True); + + data_blob_free(&local_lm_blob); + data_blob_free(&local_nt_blob); + return ret; + } +} + + +/**************************************************************************** + Create an auth_usersupplied_data structure +****************************************************************************/ + +BOOL make_user_info_for_reply(auth_usersupplied_info **user_info, + const char *smb_name, + const char *client_domain, + const uint8 chal[8], + DATA_BLOB plaintext_password) +{ + + DATA_BLOB local_lm_blob; + DATA_BLOB local_nt_blob; + BOOL ret = False; + uint32 auth_flags = AUTH_FLAG_NONE; + + /* + * Not encrypted - do so. + */ + + DEBUG(5,("make_user_info_for_reply: User passwords not in encrypted format.\n")); + + if (plaintext_password.data) { + unsigned char local_lm_response[24]; + +#ifdef DEBUG_PASSWORD + DEBUG(10,("Unencrypted password (len %d):\n",plaintext_password.length)); + dump_data(100, plaintext_password.data, plaintext_password.length); +#endif + + SMBencrypt( (const uchar *)plaintext_password.data, (const uchar*)chal, local_lm_response); + local_lm_blob = data_blob(local_lm_response, 24); + + /* We can't do an NT hash here, as the password needs to be + case insensitive */ + local_nt_blob = data_blob(NULL, 0); + + auth_flags = (AUTH_FLAG_PLAINTEXT | AUTH_FLAG_LM_RESP); + } else { + local_lm_blob = data_blob(NULL, 0); + local_nt_blob = data_blob(NULL, 0); + } + + ret = make_user_info_map(user_info, smb_name, + client_domain, + remote_machine, + local_lm_blob, + local_nt_blob, + plaintext_password, + auth_flags, False); + + data_blob_free(&local_lm_blob); + return ret; +} + +/**************************************************************************** + Create an auth_usersupplied_data structure +****************************************************************************/ + +BOOL make_user_info_for_reply_enc(auth_usersupplied_info **user_info, + const char *smb_name, + const char *client_domain, + DATA_BLOB lm_resp, DATA_BLOB nt_resp) +{ + uint32 auth_flags = AUTH_FLAG_NONE; + + DATA_BLOB no_plaintext_blob = data_blob(NULL, 0); + + if (lm_resp.length == 24) { + auth_flags |= AUTH_FLAG_LM_RESP; + } + if (nt_resp.length == 0) { + } else if (nt_resp.length == 24) { + auth_flags |= AUTH_FLAG_NTLM_RESP; + } else { + auth_flags |= AUTH_FLAG_NTLMv2_RESP; + } + + return make_user_info_map(user_info, smb_name, + client_domain, + remote_machine, + lm_resp, + nt_resp, + no_plaintext_blob, + auth_flags, True); +} + +/**************************************************************************** + Create a guest user_info blob, for anonymous authenticaion. +****************************************************************************/ + +BOOL make_user_info_guest(auth_usersupplied_info **user_info) +{ + DATA_BLOB lm_blob = data_blob(NULL, 0); + DATA_BLOB nt_blob = data_blob(NULL, 0); + DATA_BLOB plaintext_blob = data_blob(NULL, 0); + uint32 auth_flags = AUTH_FLAG_NONE; + + return make_user_info(user_info, + "","", + "","", + "", + nt_blob, lm_blob, + plaintext_blob, + auth_flags, True); +} + +/*************************************************************************** + Make a user_info struct +***************************************************************************/ + +BOOL make_server_info(auth_serversupplied_info **server_info) +{ + *server_info = malloc(sizeof(**server_info)); + if (!*server_info) { + DEBUG(0,("make_server_info: malloc failed!\n")); + return False; + } + ZERO_STRUCTP(*server_info); + return True; +} + +/*************************************************************************** + Make (and fill) a user_info struct from a SAM_ACCOUNT +***************************************************************************/ + +BOOL make_server_info_sam(auth_serversupplied_info **server_info, SAM_ACCOUNT *sampass) +{ + if (!make_server_info(server_info)) { + return False; + } + + (*server_info)->sam_fill_level = SAM_FILL_ALL; + (*server_info)->sam_account = sampass; + + DEBUG(5,("make_server_info_sam: made server info for user %s\n", + pdb_get_username((*server_info)->sam_account))); + return True; +} + +/*************************************************************************** + Make (and fill) a user_info struct from a 'struct passwd' by conversion + to a SAM_ACCOUNT +***************************************************************************/ + +BOOL make_server_info_pw(auth_serversupplied_info **server_info, const struct passwd *pwd) +{ + SAM_ACCOUNT *sampass = NULL; + if (!NT_STATUS_IS_OK(pdb_init_sam_pw(&sampass, pwd))) { + return False; + } + return make_server_info_sam(server_info, sampass); +} + +/*************************************************************************** + Free a user_info struct +***************************************************************************/ + +void free_user_info(auth_usersupplied_info **user_info) +{ + DEBUG(5,("attempting to free (and zero) a user_info structure\n")); + if (*user_info != NULL) { + if ((*user_info)->smb_name.str) { + DEBUG(10,("structure was created for %s\n", (*user_info)->smb_name.str)); + } + SAFE_FREE((*user_info)->smb_name.str); + SAFE_FREE((*user_info)->internal_username.str); + SAFE_FREE((*user_info)->client_domain.str); + SAFE_FREE((*user_info)->domain.str); + SAFE_FREE((*user_info)->wksta_name.str); + data_blob_free(&(*user_info)->lm_resp); + data_blob_free(&(*user_info)->nt_resp); + SAFE_FREE((*user_info)->interactive_password); + data_blob_clear_free(&(*user_info)->plaintext_password); + ZERO_STRUCT(**user_info); + } + SAFE_FREE(*user_info); +} + +/*************************************************************************** + Clear out a server_info struct that has been allocated +***************************************************************************/ + +void free_server_info(auth_serversupplied_info **server_info) +{ + if (*server_info != NULL) { + pdb_free_sam(&(*server_info)->sam_account); + + /* call pam_end here, unless we know we are keeping it */ + delete_nt_token( &(*server_info)->ptok ); + ZERO_STRUCT(**server_info); + } + SAFE_FREE(*server_info); +} + +/*************************************************************************** + Make a server_info struct for a guest user +***************************************************************************/ + +BOOL make_server_info_guest(auth_serversupplied_info **server_info) +{ + struct passwd *pass = getpwnam_alloc(lp_guestaccount()); + + if (pass) { + if (!make_server_info_pw(server_info, pass)) { + passwd_free(&pass); + return False; + } + (*server_info)->guest = True; + passwd_free(&pass); + return True; + } + DEBUG(0,("make_server_info_guest: getpwnam_alloc() failed on guest account!\n")); + return False; +} + +/*************************************************************************** + Make an auth_methods struct +***************************************************************************/ + +BOOL make_auth_methods(struct auth_context *auth_context, auth_methods **auth_method) +{ + if (!auth_context) { + smb_panic("no auth_context supplied to make_auth_methods()!\n"); + } + + if (!auth_method) { + smb_panic("make_auth_methods: pointer to auth_method pointer is NULL!\n"); + } + + *auth_method = talloc(auth_context->mem_ctx, sizeof(**auth_method)); + if (!*auth_method) { + DEBUG(0,("make_auth_method: malloc failed!\n")); + return False; + } + ZERO_STRUCTP(*auth_method); + + return True; +} + +/**************************************************************************** + Delete a SID token. +****************************************************************************/ + +void delete_nt_token(NT_USER_TOKEN **pptoken) +{ + if (*pptoken) { + NT_USER_TOKEN *ptoken = *pptoken; + SAFE_FREE( ptoken->user_sids ); + ZERO_STRUCTP(ptoken); + } + SAFE_FREE(*pptoken); +} + +/**************************************************************************** + Duplicate a SID token. +****************************************************************************/ + +NT_USER_TOKEN *dup_nt_token(NT_USER_TOKEN *ptoken) +{ + NT_USER_TOKEN *token; + + if (!ptoken) + return NULL; + + if ((token = (NT_USER_TOKEN *)malloc( sizeof(NT_USER_TOKEN) ) ) == NULL) + return NULL; + + ZERO_STRUCTP(token); + + if ((token->user_sids = (DOM_SID *)memdup( ptoken->user_sids, sizeof(DOM_SID) * ptoken->num_sids )) == NULL) { + SAFE_FREE(token); + return NULL; + } + + token->num_sids = ptoken->num_sids; + + return token; +} + +/** + * Squash an NT_STATUS in line with security requirements. + * In an attempt to avoid giving the whole game away when users + * are authenticating, NT replaces both NT_STATUS_NO_SUCH_USER and + * NT_STATUS_WRONG_PASSWORD with NT_STATUS_LOGON_FAILURE in certain situations + * (session setups in particular). + * + * @param nt_status NTSTATUS input for squashing. + * @return the 'squashed' nt_status + **/ + +NTSTATUS nt_status_squash(NTSTATUS nt_status) +{ + if NT_STATUS_IS_OK(nt_status) { + return nt_status; + } else if NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) { + /* Match WinXP and don't give the game away */ + return NT_STATUS_LOGON_FAILURE; + + } else if NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD) { + /* Match WinXP and don't give the game away */ + return NT_STATUS_LOGON_FAILURE; + } else { + return nt_status; + } +} + + + |