/* Unix SMB/CIFS implementation. client connect/disconnect routines Copyright (C) Andrew Tridgell 1994-1998 Copyright (C) Gerald (Jerry) Carter 2004 Copyright (C) Jeremy Allison 2007 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 3 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, see <http://www.gnu.org/licenses/>. */ #include "includes.h" /******************************************************************** Important point. DFS paths are *always* of the form \server\share\<pathname> (the \ characters are not C escaped here). - but if we're using POSIX paths then <pathname> may contain '/' separators, not '\\' separators. So cope with '\\' or '/' as a separator when looking at the pathname part.... JRA. ********************************************************************/ struct client_connection { struct client_connection *prev, *next; struct cli_state *cli; char *mount; }; /* global state....globals reek! */ int max_protocol = PROTOCOL_NT1; static struct cm_cred_struct { char *username; char *password; bool got_pass; bool use_kerberos; bool fallback_after_kerberos; int signing_state; } cm_creds; static void cm_set_password(const char *newpass); static int port; static int name_type = 0x20; static bool have_ip; static struct sockaddr_storage dest_ss; static struct client_connection *connections; static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx, struct cli_state *cli, const char *sharename, char **pp_newserver, char **pp_newshare, bool force_encrypt, const char *username, const char *password, const char *domain); /******************************************************************** Ensure a connection is encrypted. ********************************************************************/ NTSTATUS cli_cm_force_encryption(struct cli_state *c, const char *username, const char *password, const char *domain, const char *sharename) { NTSTATUS status = cli_force_encryption(c, username, password, domain); if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) { d_printf("Encryption required and " "server that doesn't support " "UNIX extensions - failing connect\n"); } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) { d_printf("Encryption required and " "can't get UNIX CIFS extensions " "version from server.\n"); } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) { d_printf("Encryption required and " "share %s doesn't support " "encryption.\n", sharename); } else if (!NT_STATUS_IS_OK(status)) { d_printf("Encryption required and " "setup failed with error %s.\n", nt_errstr(status)); } return status; } /******************************************************************** Return a connection to a server. ********************************************************************/ static struct cli_state *do_connect(TALLOC_CTX *ctx, const char *server, const char *share, bool show_sessetup, bool force_encrypt) { struct cli_state *c = NULL; struct nmb_name called, calling; const char *server_n; struct sockaddr_storage ss; char *servicename; char *sharename; char *newserver, *newshare; const char *username; const char *password; NTSTATUS status; /* make a copy so we don't modify the global string 'service' */ servicename = talloc_strdup(ctx,share); if (!servicename) { return NULL; } sharename = servicename; if (*sharename == '\\') { server = sharename+2; sharename = strchr_m(server,'\\'); if (!sharename) { return NULL; } *sharename = 0; sharename++; } server_n = server; zero_addr(&ss); make_nmb_name(&calling, global_myname(), 0x0); make_nmb_name(&called , server, name_type); again: zero_addr(&ss); if (have_ip) ss = dest_ss; /* have to open a new connection */ if (!(c=cli_initialise()) || (cli_set_port(c, port) != port)) { d_printf("Connection to %s failed\n", server_n); if (c) { cli_shutdown(c); } return NULL; } status = cli_connect(c, server_n, &ss); if (!NT_STATUS_IS_OK(status)) { d_printf("Connection to %s failed (Error %s)\n", server_n, nt_errstr(status)); cli_shutdown(c); return NULL; } c->protocol = max_protocol; c->use_kerberos = cm_creds.use_kerberos; c->fallback_after_kerberos = cm_creds.fallback_after_kerberos; cli_setup_signing_state(c, cm_creds.signing_state); if (!cli_session_request(c, &calling, &called)) { char *p; d_printf("session request to %s failed (%s)\n", called.name, cli_errstr(c)); cli_shutdown(c); c = NULL; if ((p=strchr_m(called.name, '.'))) { *p = 0; goto again; } if (strcmp(called.name, "*SMBSERVER")) { make_nmb_name(&called , "*SMBSERVER", 0x20); goto again; } return NULL; } DEBUG(4,(" session request ok\n")); if (!cli_negprot(c)) { d_printf("protocol negotiation failed\n"); cli_shutdown(c); return NULL; } if (!cm_creds.got_pass && !cm_creds.use_kerberos) { char *label = NULL; char *pass; label = talloc_asprintf(ctx, "Enter %s's password: ", cm_creds.username); pass = getpass(label); if (pass) { cm_set_password(pass); } TALLOC_FREE(label); } username = cm_creds.username ? cm_creds.username : ""; password = cm_creds.password ? cm_creds.password : ""; if (!NT_STATUS_IS_OK(cli_session_setup(c, username, password, strlen(password), password, strlen(password), lp_workgroup()))) { /* If a password was not supplied then * try again with a null username. */ if (password[0] || !username[0] || cm_creds.use_kerberos || !NT_STATUS_IS_OK(cli_session_setup(c, "", "", 0, "", 0, lp_workgroup()))) { d_printf("session setup failed: %s\n", cli_errstr(c)); if (NT_STATUS_V(cli_nt_error(c)) == NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED)) d_printf("did you forget to run kinit?\n"); cli_shutdown(c); return NULL; } d_printf("Anonymous login successful\n"); } if ( show_sessetup ) { if (*c->server_domain) { DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n", c->server_domain,c->server_os,c->server_type)); } else if (*c->server_os || *c->server_type) { DEBUG(0,("OS=[%s] Server=[%s]\n", c->server_os,c->server_type)); } } DEBUG(4,(" session setup ok\n")); /* here's the fun part....to support 'msdfs proxy' shares (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL here before trying to connect to the original share. check_dfs_proxy() will fail if it is a normal share. */ if ((c->capabilities & CAP_DFS) && cli_check_msdfs_proxy(ctx, c, sharename, &newserver, &newshare, force_encrypt, username, password, lp_workgroup())) { cli_shutdown(c); return do_connect(ctx, newserver, newshare, false, force_encrypt); } /* must be a normal share */ if (!cli_send_tconX(c, sharename, "?????", password, strlen(password)+1)) { d_printf("tree connect failed: %s\n", cli_errstr(c)); cli_shutdown(c); return NULL; } if (force_encrypt) { status = cli_cm_force_encryption(c, username, password, lp_workgroup(), sharename); if (!NT_STATUS_IS_OK(status)) { cli_shutdown(c); return NULL; } } DEBUG(4,(" tconx ok\n")); return c; } /**************************************************************************** ****************************************************************************/ static void cli_cm_set_mntpoint(struct cli_state *c, const char *mnt) { struct client_connection *p; int i; for (p=connections,i=0; p; p=p->next,i++) { if (strequal(p->cli->desthost, c->desthost) && strequal(p->cli->share, c->share)) { break; } } if (p) { char *name = clean_name(NULL, p->mount); if (!name) { return; } p->mount = talloc_strdup(p, name); TALLOC_FREE(name); } } /**************************************************************************** ****************************************************************************/ const char *cli_cm_get_mntpoint(struct cli_state *c) { struct client_connection *p; int i; for (p=connections,i=0; p; p=p->next,i++) { if (strequal(p->cli->desthost, c->desthost) && strequal(p->cli->share, c->share)) { break; } } if (p) { return p->mount; } return NULL; } /******************************************************************** Add a new connection to the list ********************************************************************/ static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx, struct cli_state *referring_cli, const char *server, const char *share, bool show_hdr, bool force_encrypt) { struct client_connection *node; /* NB This must be the null context here... JRA. */ node = TALLOC_ZERO_ARRAY(NULL, struct client_connection, 1); if (!node) { return NULL; } node->cli = do_connect(ctx, server, share, show_hdr, force_encrypt); if ( !node->cli ) { TALLOC_FREE( node ); return NULL; } DLIST_ADD( connections, node ); cli_cm_set_mntpoint(node->cli, ""); if (referring_cli && referring_cli->posix_capabilities) { uint16 major, minor; uint32 caplow, caphigh; if (cli_unix_extensions_version(node->cli, &major, &minor, &caplow, &caphigh)) { cli_set_unix_extensions_capabilities(node->cli, major, minor, caplow, caphigh); } } return node->cli; } /******************************************************************** Return a connection to a server. ********************************************************************/ static struct cli_state *cli_cm_find(const char *server, const char *share) { struct client_connection *p; for (p=connections; p; p=p->next) { if ( strequal(server, p->cli->desthost) && strequal(share,p->cli->share)) { return p->cli; } } return NULL; } /**************************************************************************** Open a client connection to a \\server\share. Set's the current *cli global variable as a side-effect (but only if the connection is successful). ****************************************************************************/ struct cli_state *cli_cm_open(TALLOC_CTX *ctx, struct cli_state *referring_cli, const char *server, const char *share, bool show_hdr, bool force_encrypt) { struct cli_state *c; /* try to reuse an existing connection */ c = cli_cm_find(server, share); if (!c) { c = cli_cm_connect(ctx, referring_cli, server, share, show_hdr, force_encrypt); } return c; } /**************************************************************************** ****************************************************************************/ void cli_cm_shutdown(void) { struct client_connection *p, *x; for (p=connections; p;) { cli_shutdown(p->cli); x = p; p = p->next; TALLOC_FREE(x); } connections = NULL; return; } /**************************************************************************** ****************************************************************************/ void cli_cm_display(void) { struct client_connection *p; int i; for ( p=connections,i=0; p; p=p->next,i++ ) { d_printf("%d:\tserver=%s, share=%s\n", i, p->cli->desthost, p->cli->share ); } } /**************************************************************************** ****************************************************************************/ static void cm_set_password(const char *newpass) { SAFE_FREE(cm_creds.password); cm_creds.password = SMB_STRDUP(newpass); if (cm_creds.password) { cm_creds.got_pass = true; } } /**************************************************************************** ****************************************************************************/ void cli_cm_set_credentials(void) { SAFE_FREE(cm_creds.username); cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username()); if (get_cmdline_auth_info_got_pass()) { cm_set_password(get_cmdline_auth_info_password()); } cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(); cm_creds.fallback_after_kerberos = false; cm_creds.signing_state = get_cmdline_auth_info_signing_state(); } /**************************************************************************** ****************************************************************************/ void cli_cm_set_port(int port_number) { port = port_number; } /**************************************************************************** ****************************************************************************/ void cli_cm_set_dest_name_type(int type) { name_type = type; } /**************************************************************************** ****************************************************************************/ void cli_cm_set_signing_state(int state) { cm_creds.signing_state = state; } /**************************************************************************** ****************************************************************************/ void cli_cm_set_username(const char *username) { SAFE_FREE(cm_creds.username); cm_creds.username = SMB_STRDUP(username); } /**************************************************************************** ****************************************************************************/ void cli_cm_set_password(const char *newpass) { SAFE_FREE(cm_creds.password); cm_creds.password = SMB_STRDUP(newpass); if (cm_creds.password) { cm_creds.got_pass = true; } } /**************************************************************************** ****************************************************************************/ void cli_cm_set_use_kerberos(void) { cm_creds.use_kerberos = true; } /**************************************************************************** ****************************************************************************/ void cli_cm_set_fallback_after_kerberos(void) { cm_creds.fallback_after_kerberos = true; } /**************************************************************************** ****************************************************************************/ void cli_cm_set_dest_ss(struct sockaddr_storage *pss) { dest_ss = *pss; have_ip = true; } /********************************************************************** split a dfs path into the server, share name, and extrapath components **********************************************************************/ static void split_dfs_path(TALLOC_CTX *ctx, const char *nodepath, char **pp_server, char **pp_share, char **pp_extrapath) { char *p, *q; char *path; *pp_server = NULL; *pp_share = NULL; *pp_extrapath = NULL; path = talloc_strdup(ctx, nodepath); if (!path) { return; } if ( path[0] != '\\' ) { return; } p = strchr_m( path + 1, '\\' ); if ( !p ) { return; } *p = '\0'; p++; /* Look for any extra/deep path */ q = strchr_m(p, '\\'); if (q != NULL) { *q = '\0'; q++; *pp_extrapath = talloc_strdup(ctx, q); } else { *pp_extrapath = talloc_strdup(ctx, ""); } *pp_share = talloc_strdup(ctx, p); *pp_server = talloc_strdup(ctx, &path[1]); } /**************************************************************************** Return the original path truncated at the directory component before the first wildcard character. Trust the caller to provide a NULL terminated string ****************************************************************************/ static char *clean_path(TALLOC_CTX *ctx, const char *path) { size_t len; char *p1, *p2, *p; char *path_out; /* No absolute paths. */ while (IS_DIRECTORY_SEP(*path)) { path++; } path_out = talloc_strdup(ctx, path); if (!path_out) { return NULL; } p1 = strchr_m(path_out, '*'); p2 = strchr_m(path_out, '?'); if (p1 || p2) { if (p1 && p2) { p = MIN(p1,p2); } else if (!p1) { p = p2; } else { p = p1; } *p = '\0'; /* Now go back to the start of this component. */ p1 = strrchr_m(path_out, '/'); p2 = strrchr_m(path_out, '\\'); p = MAX(p1,p2); if (p) { *p = '\0'; } } /* Strip any trailing separator */ len = strlen(path_out); if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) { path_out[len-1] = '\0'; } return path_out; } /**************************************************************************** ****************************************************************************/ static char *cli_dfs_make_full_path(TALLOC_CTX *ctx, struct cli_state *cli, const char *dir) { /* Ensure the extrapath doesn't start with a separator. */ while (IS_DIRECTORY_SEP(*dir)) { dir++; } return talloc_asprintf(ctx, "\\%s\\%s\\%s", cli->desthost, cli->share, dir); } /******************************************************************** check for dfs referral ********************************************************************/ static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status ) { uint32 flgs2 = SVAL(cli->inbuf,smb_flg2); /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */ if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) && (flgs2&FLAGS2_UNICODE_STRINGS))) return false; if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls)))) return true; return false; } /******************************************************************** Get the dfs referral link. ********************************************************************/ bool cli_dfs_get_referral(TALLOC_CTX *ctx, struct cli_state *cli, const char *path, CLIENT_DFS_REFERRAL**refs, size_t *num_refs, uint16 *consumed) { unsigned int data_len = 0; unsigned int param_len = 0; uint16 setup = TRANSACT2_GET_DFS_REFERRAL; char *param; char *rparam=NULL, *rdata=NULL; char *p; char *endp; size_t pathlen = 2*(strlen(path)+1); uint16 num_referrals; CLIENT_DFS_REFERRAL *referrals = NULL; bool ret = false; *num_refs = 0; *refs = NULL; param = SMB_MALLOC_ARRAY(char, 2+pathlen+2); if (!param) { return false; } SSVAL(param, 0, 0x03); /* max referral level */ p = ¶m[2]; p += clistr_push(cli, p, path, pathlen, STR_TERMINATE); param_len = PTR_DIFF(p, param); if (!cli_send_trans(cli, SMBtrans2, NULL, /* name */ -1, 0, /* fid, flags */ &setup, 1, 0, /* setup, length, max */ param, param_len, 2, /* param, length, max */ NULL, 0, cli->max_xmit /* data, length, max */ )) { SAFE_FREE(param); return false; } SAFE_FREE(param); if (!cli_receive_trans(cli, SMBtrans2, &rparam, ¶m_len, &rdata, &data_len)) { return false; } if (data_len < 4) { goto out; } endp = rdata + data_len; *consumed = SVAL(rdata, 0); num_referrals = SVAL(rdata, 2); if (num_referrals != 0) { uint16 ref_version; uint16 ref_size; int i; uint16 node_offset; referrals = TALLOC_ARRAY(ctx, CLIENT_DFS_REFERRAL, num_referrals); if (!referrals) { goto out; } /* start at the referrals array */ p = rdata+8; for (i=0; i<num_referrals && p < endp; i++) { if (p + 18 > endp) { goto out; } ref_version = SVAL(p, 0); ref_size = SVAL(p, 2); node_offset = SVAL(p, 16); if (ref_version != 3) { p += ref_size; continue; } referrals[i].proximity = SVAL(p, 8); referrals[i].ttl = SVAL(p, 10); if (p + node_offset > endp) { goto out; } clistr_pull_talloc(ctx, cli, &referrals[i].dfspath, p+node_offset, -1, STR_TERMINATE|STR_UNICODE ); if (!referrals[i].dfspath) { goto out; } p += ref_size; } if (i < num_referrals) { goto out; } } ret = true; *num_refs = num_referrals; *refs = referrals; out: SAFE_FREE(rdata); SAFE_FREE(rparam); return ret; } /******************************************************************** ********************************************************************/ bool cli_resolve_path(TALLOC_CTX *ctx, const char *mountpt, struct cli_state *rootcli, const char *path, struct cli_state **targetcli, char **pp_targetpath) { CLIENT_DFS_REFERRAL *refs = NULL; size_t num_refs = 0; uint16 consumed; struct cli_state *cli_ipc = NULL; char *dfs_path = NULL; char *cleanpath = NULL; char *extrapath = NULL; int pathlen; char *server = NULL; char *share = NULL; struct cli_state *newcli = NULL; char *newpath = NULL; char *newmount = NULL; char *ppath = NULL; SMB_STRUCT_STAT sbuf; uint32 attributes; if ( !rootcli || !path || !targetcli ) { return false; } /* Don't do anything if this is not a DFS root. */ if ( !rootcli->dfsroot) { *targetcli = rootcli; *pp_targetpath = talloc_strdup(ctx, path); if (!*pp_targetpath) { return false; } return true; } *targetcli = NULL; /* Send a trans2_query_path_info to check for a referral. */ cleanpath = clean_path(ctx, path); if (!cleanpath) { return false; } dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath); if (!dfs_path) { return false; } if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) { /* This is an ordinary path, just return it. */ *targetcli = rootcli; *pp_targetpath = talloc_strdup(ctx, path); if (!*pp_targetpath) { return false; } goto done; } /* Special case where client asked for a path that does not exist */ if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) { *targetcli = rootcli; *pp_targetpath = talloc_strdup(ctx, path); if (!*pp_targetpath) { return false; } goto done; } /* We got an error, check for DFS referral. */ if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) { return false; } /* Check for the referral. */ if (!(cli_ipc = cli_cm_open(ctx, rootcli, rootcli->desthost, "IPC$", false, (rootcli->trans_enc_state != NULL)))) { return false; } if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs, &num_refs, &consumed) || !num_refs) { return false; } /* Just store the first referral for now. */ if (!refs[0].dfspath) { return false; } split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath ); if (!server || !share) { return false; } /* Make sure to recreate the original string including any wildcards. */ dfs_path = cli_dfs_make_full_path(ctx, rootcli, path); if (!dfs_path) { return false; } pathlen = strlen(dfs_path)*2; consumed = MIN(pathlen, consumed); *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]); if (!*pp_targetpath) { return false; } dfs_path[consumed/2] = '\0'; /* * *pp_targetpath is now the unconsumed part of the path. * dfs_path is now the consumed part of the path * (in \server\share\path format). */ /* Open the connection to the target server & share */ if ((*targetcli = cli_cm_open(ctx, rootcli, server, share, false, (rootcli->trans_enc_state != NULL))) == NULL) { d_printf("Unable to follow dfs referral [\\%s\\%s]\n", server, share ); return false; } if (extrapath && strlen(extrapath) > 0) { *pp_targetpath = talloc_asprintf(ctx, "%s%s", extrapath, *pp_targetpath); if (!*pp_targetpath) { return false; } } /* parse out the consumed mount path */ /* trim off the \server\share\ */ ppath = dfs_path; if (*ppath != '\\') { d_printf("cli_resolve_path: " "dfs_path (%s) not in correct format.\n", dfs_path ); return false; } ppath++; /* Now pointing at start of server name. */ if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) { return false; } ppath++; /* Now pointing at start of share name. */ if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) { return false; } ppath++; /* Now pointing at path component. */ newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath ); if (!newmount) { return false; } cli_cm_set_mntpoint(*targetcli, newmount); /* Check for another dfs referral, note that we are not checking for loops here. */ if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) { if (cli_resolve_path(ctx, newmount, *targetcli, *pp_targetpath, &newcli, &newpath)) { /* * When cli_resolve_path returns true here it's always * returning the complete path in newpath, so we're done * here. */ *targetcli = newcli; *pp_targetpath = newpath; return true; } } done: /* If returning true ensure we return a dfs root full path. */ if ((*targetcli)->dfsroot) { dfs_path = talloc_strdup(ctx, *pp_targetpath); if (!dfs_path) { return false; } *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path); } return true; } /******************************************************************** ********************************************************************/ static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx, struct cli_state *cli, const char *sharename, char **pp_newserver, char **pp_newshare, bool force_encrypt, const char *username, const char *password, const char *domain) { CLIENT_DFS_REFERRAL *refs = NULL; size_t num_refs = 0; uint16 consumed; char *fullpath = NULL; bool res; uint16 cnum; char *newextrapath = NULL; if (!cli || !sharename) { return false; } cnum = cli->cnum; /* special case. never check for a referral on the IPC$ share */ if (strequal(sharename, "IPC$")) { return false; } /* send a trans2_query_path_info to check for a referral */ fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename ); if (!fullpath) { return false; } /* check for the referral */ if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) { return false; } if (force_encrypt) { NTSTATUS status = cli_cm_force_encryption(cli, username, password, lp_workgroup(), "IPC$"); if (!NT_STATUS_IS_OK(status)) { return false; } } res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed); if (!cli_tdis(cli)) { return false; } cli->cnum = cnum; if (!res || !num_refs) { return false; } if (!refs[0].dfspath) { return false; } split_dfs_path(ctx, refs[0].dfspath, pp_newserver, pp_newshare, &newextrapath ); if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) { return false; } /* check that this is not a self-referral */ if (strequal(cli->desthost, *pp_newserver) && strequal(sharename, *pp_newshare)) { return false; } return true; }