/* * 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. */ /* * negotiate_sspi_auth: helper for Negotiate Authentication for Squid Cache * * (C)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 2000 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 1.0 * 29-10-2005 Guido Serassio * First release. */ #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_GETOPT_H #include #endif #if HAVE_CTYPE_H #include #endif int Negotiate_packet_debug_enabled = 0; static int have_serverblob; /* A couple of harmless helper macros */ #define SEND(X) debug("sending '%s' to squid\n",X); printf(X "\n"); #ifdef __GNUC__ #define SEND2(X,Y...) debug("sending '" X "' to squid\n",Y); printf(X "\n",Y); #define SEND3(X,Y...) debug("sending '" X "' to squid\n",Y); printf(X "\n",Y); #else /* no gcc, no debugging. varargs macros are a gcc extension */ #define SEND2(X,Y) debug("sending '" X "' to squid\n",Y); printf(X "\n",Y); #define SEND3(X,Y,Z) debug("sending '" X "' to squid\n",Y,Z); printf(X "\n",Y,Z); #endif char *negotiate_check_auth(SSP_blobP auth, int auth_length); /* * options: * -d enable debugging. * -v enable verbose Negotiate packet debugging. */ char *my_program_name = NULL; void usage() { fprintf(stderr, "Usage: %s [-d] [-v] [-h]\n" " -d enable debugging.\n" " -v enable verbose Negotiate packet debugging.\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, "hdv"))) { switch (opt) { case 'd': debug_enabled = 1; break; case 'v': debug_enabled = 1; Negotiate_packet_debug_enabled = 1; break; case 'h': usage(); exit(0); case '?': opt = optopt; /* fall thru to default */ default: fprintf(stderr, "ERROR: unknown option: -%c. Exiting\n", opt); usage(); had_error = 1; } } if (had_error) exit(1); } int manage_request() { char buf[HELPER_INPUT_BUFFER]; char decoded[HELPER_INPUT_BUFFER]; int decodedLen; char helper_command[3]; char *c; int status; int oversized = 0; char *ErrorMessage; static char cred[SSP_MAX_CRED_LEN + 1]; BOOL Done = FALSE; try_again: if (fgets(buf, HELPER_INPUT_BUFFER, stdin)) return 0; c = static_cast(memchr(buf, '\n', HELPER_INPUT_BUFFER)); if (c) { if (oversized) { SEND("BH illegal request received"); fprintf(stderr, "ERROR: Illegal request received: '%s'\n", buf); return 1; } *c = '\0'; } else { fprintf(stderr, "No newline in '%s'\n", buf); oversized = 1; goto try_again; } if ((strlen(buf) > 3) && Negotiate_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 ", 3) == 0) { /* refresh-request */ /* figure out what we got */ decodedLen = base64_decode(decoded, sizeof(decoded), buf + 3); if ((size_t)decodedLen < sizeof(ntlmhdr)) { /* decoding failure, return error */ SEND("NA * Packet format error, couldn't base64-decode"); return 1; } /* Obtain server blob against SSPI */ c = (char *) SSP_MakeNegotiateBlob(decoded, decodedLen, &Done, &status, cred); if (status == SSP_OK) { if (Done) { lc(cred); /* let's lowercase them for our convenience */ have_serverblob = 0; Done = FALSE; if (Negotiate_packet_debug_enabled) { decodedLen = base64_decode(decoded, sizeof(decoded), c); debug("sending 'AF' %s to squid with data:\n", cred); if (c != NULL) hex_dump(reinterpret_cast(decoded), decodedLen); else fprintf(stderr, "No data available.\n"); printf("AF %s %s\n", c, cred); } else SEND3("AF %s %s", c, cred); } else { if (Negotiate_packet_debug_enabled) { decodedLen = base64_decode(decoded, sizeof(decoded), c); debug("sending 'TT' to squid with data:\n"); hex_dump(reinterpret_cast(decoded), decodedLen); printf("TT %s\n", c); } else { SEND2("TT %s", c); } have_serverblob = 1; } } else SEND("BH can't obtain server blob"); return 1; } if (memcmp(buf, "KK ", 3) == 0) { /* authenticate-request */ if (!have_serverblob) { SEND("BH invalid server blob"); 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("NA * Packet format error, couldn't base64-decode"); return 1; } /* check against SSPI */ c = (char *) SSP_ValidateNegotiateCredentials(decoded, decodedLen, &Done, &status, cred); if (status == SSP_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'; SEND2("NA * %s", ErrorMessage); LocalFree(ErrorMessage); return 1; } if (Done) { lc(cred); /* let's lowercase them for our convenience */ have_serverblob = 0; Done = FALSE; if (Negotiate_packet_debug_enabled) { decodedLen = base64_decode(decoded, sizeof(decoded), c); debug("sending 'AF' %s to squid with data:\n", cred); if (c != NULL) hex_dump(reinterpret_cast(decoded), decodedLen); else fprintf(stderr, "No data available.\n"); printf("AF %s %s\n", c, cred); } else { SEND3("AF %s %s", c, cred); } return 1; } else { if (Negotiate_packet_debug_enabled) { decodedLen = base64_decode(decoded, sizeof(decoded), c); debug("sending 'TT' to squid with data:\n"); hex_dump(reinterpret_cast(decoded), decodedLen); printf("TT %s\n", c); } else SEND2("TT %s", c); return 1; } } else { /* not an auth-request */ SEND("BH illegal request received"); fprintf(stderr, "Illegal request received: '%s'\n", buf); return 1; } SEND("BH 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, NEGOTIATE_PACKAGE_NAME) == NULL) { fprintf(stderr, "FATAL: %s: can't initialize SSPI, exiting.\n", argv[0]); 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); }