/* * Copyright (C) 1996-2017 The Squid Software Foundation and contributors * * Squid software is distributed under GPLv2+ license and includes * contributions from numerous individuals and organizations. * Please see the COPYING and CONTRIBUTORS files for details. */ /* * ntlm_sspi_auth: helper for NTLM Authentication for Squid Cache * * (C)2002,2005 Guido Serassio - Acme Consulting S.r.l. * * Authors: * Guido Serassio * Acme Consulting S.r.l., Italy * * With contributions from others mentioned in the change history section * below. * * Based on previous work of Francesco Chemolli and Robert Collins. * * Dependencies: Windows NT4 SP4 and later. * * 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA. * * History: * * Version 1.22 * 29-10-2005 Guido Serassio * Updated for Negotiate auth support. * Version 1.21 * 21-02-2004 Guido Serassio * Removed control of use of NTLM NEGOTIATE packet from * command line, now the support is automatic. * Version 1.20 * 30-11-2003 Guido Serassio * Added support for NTLM local calls. * Added control of use of NTLM NEGOTIATE packet from * command line. * Updated documentation. * Version 1.10 * 07-09-2003 Guido Serassio * Now is true NTLM authenticator. * More debug info. * Updated documentation. * Version 1.0 * 29-06-2002 Guido Serassio * First release. * * */ /************* CONFIGURATION ***************/ #define FAIL_DEBUG 0 /************* END CONFIGURATION ***************/ //typedef unsigned char uchar; #include "squid.h" #include "base64.h" #include "helpers/defines.h" #include "ntlmauth/ntlmauth.h" #include "ntlmauth/support_bits.cci" #include "sspwin32.h" #include "util.h" #include #include #include #if HAVE_CTYPE_H #include #endif #if HAVE_GETOPT_H #include #endif #include #include int NTLM_packet_debug_enabled = 0; static int have_challenge; char * NTAllowedGroup; char * NTDisAllowedGroup; int UseDisallowedGroup = 0; int UseAllowedGroup = 0; #if FAIL_DEBUG int fail_debug_enabled = 0; #endif /* returns 1 on success, 0 on failure */ int Valid_Group(char *UserName, char *Group) { int result = FALSE; WCHAR wszUserName[UNLEN+1]; // Unicode user name WCHAR wszGroup[GNLEN+1]; // Unicode Group LPLOCALGROUP_USERS_INFO_0 pBuf = NULL; LPLOCALGROUP_USERS_INFO_0 pTmpBuf; DWORD dwLevel = 0; DWORD dwFlags = LG_INCLUDE_INDIRECT; DWORD dwPrefMaxLen = -1; DWORD dwEntriesRead = 0; DWORD dwTotalEntries = 0; NET_API_STATUS nStatus; DWORD i; DWORD dwTotalCount = 0; /* Convert ANSI User Name and Group to Unicode */ MultiByteToWideChar(CP_ACP, 0, UserName, strlen(UserName) + 1, wszUserName, sizeof(wszUserName) / sizeof(wszUserName[0])); MultiByteToWideChar(CP_ACP, 0, Group, strlen(Group) + 1, wszGroup, sizeof(wszGroup) / sizeof(wszGroup[0])); /* * Call the NetUserGetLocalGroups function * specifying information level 0. * * The LG_INCLUDE_INDIRECT flag specifies that the * function should also return the names of the local * groups in which the user is indirectly a member. */ nStatus = NetUserGetLocalGroups(NULL, wszUserName, dwLevel, dwFlags, (LPBYTE *) & pBuf, dwPrefMaxLen, &dwEntriesRead, &dwTotalEntries); /* * If the call succeeds, */ if (nStatus == NERR_Success) { if ((pTmpBuf = pBuf) != NULL) { for (i = 0; i < dwEntriesRead; ++i) { if (pTmpBuf == NULL) { result = FALSE; break; } if (wcscmp(pTmpBuf->lgrui0_name, wszGroup) == 0) { result = TRUE; break; } ++pTmpBuf; ++dwTotalCount; } } } else result = FALSE; /* * Free the allocated memory. */ if (pBuf != NULL) NetApiBufferFree(pBuf); return result; } char * AllocStrFromLSAStr(LSA_UNICODE_STRING LsaStr) { size_t len; static char * target; len = LsaStr.Length/sizeof(WCHAR) + 1; /* allocate buffer for str + null termination */ safe_free(target); target = (char *)xmalloc(len); if (target == NULL) return NULL; /* copy unicode buffer */ WideCharToMultiByte(CP_ACP, 0, LsaStr.Buffer, LsaStr.Length, target, len, NULL, NULL ); /* add null termination */ target[len-1] = '\0'; return target; } char * GetDomainName(void) { LSA_HANDLE PolicyHandle; LSA_OBJECT_ATTRIBUTES ObjectAttributes; NTSTATUS status; PPOLICY_PRIMARY_DOMAIN_INFO ppdiDomainInfo; PWKSTA_INFO_100 pwkiWorkstationInfo; DWORD netret; char * DomainName = NULL; /* * Always initialize the object attributes to all zeroes. */ memset(&ObjectAttributes, '\0', sizeof(ObjectAttributes)); /* * You need the local workstation name. Use NetWkstaGetInfo at level * 100 to retrieve a WKSTA_INFO_100 structure. * * The wki100_computername field contains a pointer to a UNICODE * string containing the local computer name. */ netret = NetWkstaGetInfo(NULL, 100, (LPBYTE *)&pwkiWorkstationInfo); if (netret == NERR_Success) { /* * We have the workstation name in: * pwkiWorkstationInfo->wki100_computername * * Next, open the policy object for the local system using * the LsaOpenPolicy function. */ status = LsaOpenPolicy( NULL, &ObjectAttributes, GENERIC_READ | POLICY_VIEW_LOCAL_INFORMATION, &PolicyHandle ); /* * Error checking. */ if (status) { debug("OpenPolicy Error: %ld\n", status); } else { /* * You have a handle to the policy object. Now, get the * domain information using LsaQueryInformationPolicy. */ status = LsaQueryInformationPolicy(PolicyHandle, PolicyPrimaryDomainInformation, (void **)&ppdiDomainInfo); if (status) { debug("LsaQueryInformationPolicy Error: %ld\n", status); } else { /* Get name in useable format */ DomainName = AllocStrFromLSAStr(ppdiDomainInfo->Name); /* * Check the Sid pointer, if it is null, the * workstation is either a stand-alone computer * or a member of a workgroup. */ if (ppdiDomainInfo->Sid) { /* * Member of a domain. Display it in debug mode. */ debug("Member of Domain %s\n",DomainName); } else { DomainName = NULL; } } } /* * Clean up all the memory buffers created by the LSA and * Net* APIs. */ NetApiBufferFree(pwkiWorkstationInfo); LsaFreeMemory((LPVOID)ppdiDomainInfo); } else debug("NetWkstaGetInfo Error: %ld\n", netret); return DomainName; } /* * Fills auth with the user's credentials. * * In case of problem returns one of the * codes defined in libntlmauth/ntlmauth.h */ int ntlm_check_auth(ntlm_authenticate * auth, char *user, char *domain, int auth_length) { int x; int rv; char credentials[DNLEN+UNLEN+2]; /* we can afford to waste */ if (!NTLM_LocalCall) { user[0] = '\0'; domain[0] = '\0'; x = ntlm_unpack_auth(auth, user, domain, auth_length); if (x != NTLM_ERR_NONE) return x; if (domain[0] == '\0') { debug("No domain supplied. Returning no-auth\n"); return NTLM_BAD_REQUEST; } if (user[0] == '\0') { debug("No username supplied. Returning no-auth\n"); return NTLM_BAD_REQUEST; } debug("checking domain: '%s', user: '%s'\n", domain, user); } else debug("checking local user\n"); snprintf(credentials, DNLEN+UNLEN+2, "%s\\%s", domain, user); rv = SSP_ValidateNTLMCredentials(auth, auth_length, credentials); debug("Login attempt had result %d\n", rv); if (!rv) { /* failed */ return NTLM_SSPI_ERROR; } if (UseAllowedGroup) { if (!Valid_Group(credentials, NTAllowedGroup)) { debug("User %s not in allowed Group %s\n", credentials, NTAllowedGroup); return NTLM_BAD_NTGROUP; } } if (UseDisallowedGroup) { if (Valid_Group(credentials, NTDisAllowedGroup)) { debug("User %s is in denied Group %s\n", credentials, NTDisAllowedGroup); return NTLM_BAD_NTGROUP; } } debug("credentials: %s\n", credentials); return NTLM_ERR_NONE; } void helperfail(const char *reason) { #if FAIL_DEBUG fail_debug_enabled =1; #endif SEND_BH(reason); } /* options: -d enable debugging. -v enable verbose NTLM packet debugging. -A can specify a Windows Local Group name allowed to authenticate. -D can specify a Windows Local Group name not allowed to authenticate. */ char *my_program_name = NULL; void usage() { fprintf(stderr, "Usage: %s [-d] [-v] [-A|D LocalUserGroup] [-h]\n" " -d enable debugging.\n" " -v enable verbose NTLM packet debugging.\n" " -A specify a Windows Local Group name allowed to authenticate\n" " -D specify a Windows Local Group name not allowed to authenticate\n" " -h this message\n\n", my_program_name); } void process_options(int argc, char *argv[]) { int opt, had_error = 0; opterr =0; while (-1 != (opt = getopt(argc, argv, "hdvA:D:"))) { switch (opt) { case 'A': safe_free(NTAllowedGroup); NTAllowedGroup=xstrdup(optarg); UseAllowedGroup = 1; break; case 'D': safe_free(NTDisAllowedGroup); NTDisAllowedGroup=xstrdup(optarg); UseDisallowedGroup = 1; break; case 'd': debug_enabled = 1; break; case 'v': debug_enabled = 1; NTLM_packet_debug_enabled = 1; break; case 'h': usage(); exit(0); case '?': opt = optopt; /* fall thru to default */ default: fprintf(stderr, "unknown option: -%c. Exiting\n", opt); usage(); had_error = 1; } } if (had_error) exit(1); } int manage_request() { ntlmhdr *fast_header; char buf[HELPER_INPUT_BUFFER]; char decoded[HELPER_INPUT_BUFFER]; int decodedLen; char helper_command[3]; int oversized = 0; char * ErrorMessage; static ntlm_negotiate local_nego; char domain[DNLEN+1]; char user[UNLEN+1]; /* NP: for some reason this helper sometimes needs to accept * from clients that send no negotiate packet. */ if (memcpy(local_nego.hdr.signature, "NTLMSSP", 8) != 0) { memset(&local_nego, 0, sizeof(ntlm_negotiate)); /* reset */ memcpy(local_nego.hdr.signature, "NTLMSSP", 8); /* set the signature */ local_nego.hdr.type = le32toh(NTLM_NEGOTIATE); /* this is a challenge */ local_nego.flags = le32toh(NTLM_NEGOTIATE_ALWAYS_SIGN | NTLM_NEGOTIATE_USE_NTLM | NTLM_NEGOTIATE_USE_LM | NTLM_NEGOTIATE_ASCII ); } do { if (fgets(buf, sizeof(buf), stdin) == NULL) return 0; char *c = static_cast(memchr(buf, '\n', sizeof(buf))); if (c) { if (oversized) { helperfail("messge=\"illegal request received\""); fprintf(stderr, "Illegal request received: '%s'\n", buf); return 1; } *c = '\0'; } else { fprintf(stderr, "No newline in '%s'\n", buf); oversized = 1; continue; } } while (false); if ((strlen(buf) > 3) && NTLM_packet_debug_enabled) { decodedLen = base64_decode(decoded, sizeof(decoded), buf+3); strncpy(helper_command, buf, 2); debug("Got '%s' from Squid with data:\n", helper_command); hex_dump(reinterpret_cast(decoded), decodedLen); } else debug("Got '%s' from Squid\n", buf); if (memcmp(buf, "YR", 2) == 0) { /* refresh-request */ /* figure out what we got */ if (strlen(buf) > 3) decodedLen = base64_decode(decoded, sizeof(decoded), buf+3); else { debug("Negotiate packet not supplied - self generated\n"); memcpy(decoded, &local_nego, sizeof(local_nego)); decodedLen = sizeof(local_nego); } if ((size_t)decodedLen < sizeof(ntlmhdr)) { /* decoding failure, return error */ SEND_ERR("message=\"Packet format error, couldn't base64-decode\""); return 1; } /* fast-track-decode request type. */ fast_header = (struct _ntlmhdr *) decoded; /* sanity-check: it IS a NTLMSSP packet, isn't it? */ if (ntlm_validate_packet(fast_header, NTLM_ANY) != NTLM_ERR_NONE) { SEND_ERR("message=\"Broken authentication packet\""); return 1; } switch (fast_header->type) { case NTLM_NEGOTIATE: { /* Obtain challenge against SSPI */ debug("attempting SSPI challenge retrieval\n"); char *c = (char *) SSP_MakeChallenge((ntlm_negotiate *) decoded, decodedLen); if (c) { SEND_TT(c); if (NTLM_packet_debug_enabled) { decodedLen = base64_decode(decoded, sizeof(decoded), c); debug("send 'TT' to squid with data:\n"); hex_dump(reinterpret_cast(decoded), decodedLen); if (NTLM_LocalCall) { debug("NTLM Local Call detected\n"); } } have_challenge = 1; } else helperfail("message=\"can't obtain challenge\""); return 1; } /* notreached */ case NTLM_CHALLENGE: SEND_ERR("message=\"Got a challenge. We refuse to have our authority disputed\""); return 1; /* notreached */ case NTLM_AUTHENTICATE: SEND_ERR("message=\"Got authentication request instead of negotiate request\""); return 1; /* notreached */ default: helperfail("message=\"unknown refresh-request packet type\""); return 1; } return 1; } if (memcmp(buf, "KK ", 3) == 0) { /* authenticate-request */ if (!have_challenge) { helperfail("message=\"invalid challenge\""); return 1; } /* figure out what we got */ decodedLen = base64_decode(decoded, sizeof(decoded), buf+3); if ((size_t)decodedLen < sizeof(ntlmhdr)) { /* decoding failure, return error */ SEND_ERR("message=\"Packet format error, couldn't base64-decode\""); return 1; } /* fast-track-decode request type. */ fast_header = (struct _ntlmhdr *) decoded; /* sanity-check: it IS a NTLMSSP packet, isn't it? */ if (ntlm_validate_packet(fast_header, NTLM_ANY) != NTLM_ERR_NONE) { SEND_ERR("message=\"Broken authentication packet\""); return 1; } switch (fast_header->type) { case NTLM_NEGOTIATE: SEND_ERR("message=\"Invalid negotiation request received\""); return 1; /* notreached */ case NTLM_CHALLENGE: SEND_ERR("message=\"Got a challenge. We refuse to have our authority disputed\""); return 1; /* notreached */ case NTLM_AUTHENTICATE: { /* check against SSPI */ int err = ntlm_check_auth((ntlm_authenticate *) decoded, user, domain, decodedLen); have_challenge = 0; if (err != NTLM_ERR_NONE) { #if FAIL_DEBUG fail_debug_enabled =1; #endif switch (err) { case NTLM_ERR_NONE: break; case NTLM_BAD_NTGROUP: SEND_ERR("message=\"Incorrect Group Membership\""); return 1; case NTLM_BAD_REQUEST: SEND_ERR("message=\"Incorrect Request Format\""); return 1; case NTLM_SSPI_ERROR: FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language (LPTSTR) &ErrorMessage, 0, NULL); if (ErrorMessage[strlen(ErrorMessage) - 1] == '\n') ErrorMessage[strlen(ErrorMessage) - 1] = '\0'; if (ErrorMessage[strlen(ErrorMessage) - 1] == '\r') ErrorMessage[strlen(ErrorMessage) - 1] = '\0'; SEND_ERR(ErrorMessage); // TODO update to new syntax LocalFree(ErrorMessage); return 1; default: SEND_ERR("message=\"Unknown Error\""); return 1; } } /* let's lowercase them for our convenience */ lc(domain); lc(user); fprintf(stdout, "OK user=\"%s\\%s\"", domain, user); return 1; } default: helperfail("message=\"unknown authentication packet type\""); return 1; } return 1; } else { /* not an auth-request */ helperfail("message=\"illegal request received\""); fprintf(stderr, "Illegal request received: '%s'\n", buf); return 1; } helperfail("message=\"detected protocol error\""); return 1; /********* END ********/ } int main(int argc, char *argv[]) { my_program_name = argv[0]; process_options(argc, argv); debug("%s " VERSION " " SQUID_BUILD_INFO " starting up...\n", my_program_name); if (LoadSecurityDll(SSP_NTLM, NTLM_PACKAGE_NAME) == NULL) { fprintf(stderr, "FATAL, can't initialize SSPI, exiting.\n"); exit(1); } debug("SSPI initialized OK\n"); atexit(UnloadSecurityDll); /* initialize FDescs */ setbuf(stdout, NULL); setbuf(stderr, NULL); while (manage_request()) { /* everything is done within manage_request */ } exit(0); }