Annotation of embedaddon/curl/lib/krb5.c, revision 1.1
1.1 ! misho 1: /* GSSAPI/krb5 support for FTP - loosely based on old krb4.c
! 2: *
! 3: * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
! 4: * (Royal Institute of Technology, Stockholm, Sweden).
! 5: * Copyright (c) 2004 - 2019 Daniel Stenberg
! 6: * All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: *
! 12: * 1. Redistributions of source code must retain the above copyright
! 13: * notice, this list of conditions and the following disclaimer.
! 14: *
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: *
! 19: * 3. Neither the name of the Institute nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE. */
! 34:
! 35: #include "curl_setup.h"
! 36:
! 37: #if defined(HAVE_GSSAPI) && !defined(CURL_DISABLE_FTP)
! 38:
! 39: #ifdef HAVE_NETDB_H
! 40: #include <netdb.h>
! 41: #endif
! 42:
! 43: #include "urldata.h"
! 44: #include "curl_base64.h"
! 45: #include "ftp.h"
! 46: #include "curl_gssapi.h"
! 47: #include "sendf.h"
! 48: #include "curl_sec.h"
! 49: #include "warnless.h"
! 50:
! 51: /* The last 3 #include files should be in this order */
! 52: #include "curl_printf.h"
! 53: #include "curl_memory.h"
! 54: #include "memdebug.h"
! 55:
! 56: static int
! 57: krb5_init(void *app_data)
! 58: {
! 59: gss_ctx_id_t *context = app_data;
! 60: /* Make sure our context is initialized for krb5_end. */
! 61: *context = GSS_C_NO_CONTEXT;
! 62: return 0;
! 63: }
! 64:
! 65: static int
! 66: krb5_check_prot(void *app_data, int level)
! 67: {
! 68: (void)app_data; /* unused */
! 69: if(level == PROT_CONFIDENTIAL)
! 70: return -1;
! 71: return 0;
! 72: }
! 73:
! 74: static int
! 75: krb5_decode(void *app_data, void *buf, int len,
! 76: int level UNUSED_PARAM,
! 77: struct connectdata *conn UNUSED_PARAM)
! 78: {
! 79: gss_ctx_id_t *context = app_data;
! 80: OM_uint32 maj, min;
! 81: gss_buffer_desc enc, dec;
! 82:
! 83: (void)level;
! 84: (void)conn;
! 85:
! 86: enc.value = buf;
! 87: enc.length = len;
! 88: maj = gss_unwrap(&min, *context, &enc, &dec, NULL, NULL);
! 89: if(maj != GSS_S_COMPLETE) {
! 90: if(len >= 4)
! 91: strcpy(buf, "599 ");
! 92: return -1;
! 93: }
! 94:
! 95: memcpy(buf, dec.value, dec.length);
! 96: len = curlx_uztosi(dec.length);
! 97: gss_release_buffer(&min, &dec);
! 98:
! 99: return len;
! 100: }
! 101:
! 102: static int
! 103: krb5_overhead(void *app_data, int level, int len)
! 104: {
! 105: /* no arguments are used */
! 106: (void)app_data;
! 107: (void)level;
! 108: (void)len;
! 109: return 0;
! 110: }
! 111:
! 112: static int
! 113: krb5_encode(void *app_data, const void *from, int length, int level, void **to)
! 114: {
! 115: gss_ctx_id_t *context = app_data;
! 116: gss_buffer_desc dec, enc;
! 117: OM_uint32 maj, min;
! 118: int state;
! 119: int len;
! 120:
! 121: /* NOTE that the cast is safe, neither of the krb5, gnu gss and heimdal
! 122: * libraries modify the input buffer in gss_wrap()
! 123: */
! 124: dec.value = (void *)from;
! 125: dec.length = length;
! 126: maj = gss_wrap(&min, *context,
! 127: level == PROT_PRIVATE,
! 128: GSS_C_QOP_DEFAULT,
! 129: &dec, &state, &enc);
! 130:
! 131: if(maj != GSS_S_COMPLETE)
! 132: return -1;
! 133:
! 134: /* malloc a new buffer, in case gss_release_buffer doesn't work as
! 135: expected */
! 136: *to = malloc(enc.length);
! 137: if(!*to)
! 138: return -1;
! 139: memcpy(*to, enc.value, enc.length);
! 140: len = curlx_uztosi(enc.length);
! 141: gss_release_buffer(&min, &enc);
! 142: return len;
! 143: }
! 144:
! 145: static int
! 146: krb5_auth(void *app_data, struct connectdata *conn)
! 147: {
! 148: int ret = AUTH_OK;
! 149: char *p;
! 150: const char *host = conn->host.name;
! 151: ssize_t nread;
! 152: curl_socklen_t l = sizeof(conn->local_addr);
! 153: struct Curl_easy *data = conn->data;
! 154: CURLcode result;
! 155: const char *service = data->set.str[STRING_SERVICE_NAME] ?
! 156: data->set.str[STRING_SERVICE_NAME] :
! 157: "ftp";
! 158: const char *srv_host = "host";
! 159: gss_buffer_desc input_buffer, output_buffer, _gssresp, *gssresp;
! 160: OM_uint32 maj, min;
! 161: gss_name_t gssname;
! 162: gss_ctx_id_t *context = app_data;
! 163: struct gss_channel_bindings_struct chan;
! 164: size_t base64_sz = 0;
! 165: struct sockaddr_in **remote_addr =
! 166: (struct sockaddr_in **)&conn->ip_addr->ai_addr;
! 167: char *stringp;
! 168:
! 169: if(getsockname(conn->sock[FIRSTSOCKET],
! 170: (struct sockaddr *)&conn->local_addr, &l) < 0)
! 171: perror("getsockname()");
! 172:
! 173: chan.initiator_addrtype = GSS_C_AF_INET;
! 174: chan.initiator_address.length = l - 4;
! 175: chan.initiator_address.value = &conn->local_addr.sin_addr.s_addr;
! 176: chan.acceptor_addrtype = GSS_C_AF_INET;
! 177: chan.acceptor_address.length = l - 4;
! 178: chan.acceptor_address.value = &(*remote_addr)->sin_addr.s_addr;
! 179: chan.application_data.length = 0;
! 180: chan.application_data.value = NULL;
! 181:
! 182: /* this loop will execute twice (once for service, once for host) */
! 183: for(;;) {
! 184: /* this really shouldn't be repeated here, but can't help it */
! 185: if(service == srv_host) {
! 186: result = Curl_ftpsend(conn, "AUTH GSSAPI");
! 187: if(result)
! 188: return -2;
! 189:
! 190: if(Curl_GetFTPResponse(&nread, conn, NULL))
! 191: return -1;
! 192:
! 193: if(data->state.buffer[0] != '3')
! 194: return -1;
! 195: }
! 196:
! 197: stringp = aprintf("%s@%s", service, host);
! 198: if(!stringp)
! 199: return -2;
! 200:
! 201: input_buffer.value = stringp;
! 202: input_buffer.length = strlen(stringp);
! 203: maj = gss_import_name(&min, &input_buffer, GSS_C_NT_HOSTBASED_SERVICE,
! 204: &gssname);
! 205: free(stringp);
! 206: if(maj != GSS_S_COMPLETE) {
! 207: gss_release_name(&min, &gssname);
! 208: if(service == srv_host) {
! 209: failf(data, "Error importing service name %s@%s", service, host);
! 210: return AUTH_ERROR;
! 211: }
! 212: service = srv_host;
! 213: continue;
! 214: }
! 215: /* We pass NULL as |output_name_type| to avoid a leak. */
! 216: gss_display_name(&min, gssname, &output_buffer, NULL);
! 217: Curl_infof(data, "Trying against %s\n", output_buffer.value);
! 218: gssresp = GSS_C_NO_BUFFER;
! 219: *context = GSS_C_NO_CONTEXT;
! 220:
! 221: do {
! 222: /* Release the buffer at each iteration to avoid leaking: the first time
! 223: we are releasing the memory from gss_display_name. The last item is
! 224: taken care by a final gss_release_buffer. */
! 225: gss_release_buffer(&min, &output_buffer);
! 226: ret = AUTH_OK;
! 227: maj = Curl_gss_init_sec_context(data,
! 228: &min,
! 229: context,
! 230: gssname,
! 231: &Curl_krb5_mech_oid,
! 232: &chan,
! 233: gssresp,
! 234: &output_buffer,
! 235: TRUE,
! 236: NULL);
! 237:
! 238: if(gssresp) {
! 239: free(_gssresp.value);
! 240: gssresp = NULL;
! 241: }
! 242:
! 243: if(GSS_ERROR(maj)) {
! 244: Curl_infof(data, "Error creating security context\n");
! 245: ret = AUTH_ERROR;
! 246: break;
! 247: }
! 248:
! 249: if(output_buffer.length != 0) {
! 250: char *cmd;
! 251:
! 252: result = Curl_base64_encode(data, (char *)output_buffer.value,
! 253: output_buffer.length, &p, &base64_sz);
! 254: if(result) {
! 255: Curl_infof(data, "base64-encoding: %s\n",
! 256: curl_easy_strerror(result));
! 257: ret = AUTH_ERROR;
! 258: break;
! 259: }
! 260:
! 261: cmd = aprintf("ADAT %s", p);
! 262: if(cmd)
! 263: result = Curl_ftpsend(conn, cmd);
! 264: else
! 265: result = CURLE_OUT_OF_MEMORY;
! 266:
! 267: free(p);
! 268: free(cmd);
! 269:
! 270: if(result) {
! 271: ret = -2;
! 272: break;
! 273: }
! 274:
! 275: if(Curl_GetFTPResponse(&nread, conn, NULL)) {
! 276: ret = -1;
! 277: break;
! 278: }
! 279:
! 280: if(data->state.buffer[0] != '2' && data->state.buffer[0] != '3') {
! 281: Curl_infof(data, "Server didn't accept auth data\n");
! 282: ret = AUTH_ERROR;
! 283: break;
! 284: }
! 285:
! 286: _gssresp.value = NULL; /* make sure it is initialized */
! 287: p = data->state.buffer + 4;
! 288: p = strstr(p, "ADAT=");
! 289: if(p) {
! 290: result = Curl_base64_decode(p + 5,
! 291: (unsigned char **)&_gssresp.value,
! 292: &_gssresp.length);
! 293: if(result) {
! 294: failf(data, "base64-decoding: %s", curl_easy_strerror(result));
! 295: ret = AUTH_CONTINUE;
! 296: break;
! 297: }
! 298: }
! 299:
! 300: gssresp = &_gssresp;
! 301: }
! 302: } while(maj == GSS_S_CONTINUE_NEEDED);
! 303:
! 304: gss_release_name(&min, &gssname);
! 305: gss_release_buffer(&min, &output_buffer);
! 306:
! 307: if(gssresp)
! 308: free(_gssresp.value);
! 309:
! 310: if(ret == AUTH_OK || service == srv_host)
! 311: return ret;
! 312:
! 313: service = srv_host;
! 314: }
! 315: return ret;
! 316: }
! 317:
! 318: static void krb5_end(void *app_data)
! 319: {
! 320: OM_uint32 min;
! 321: gss_ctx_id_t *context = app_data;
! 322: if(*context != GSS_C_NO_CONTEXT) {
! 323: OM_uint32 maj = gss_delete_sec_context(&min, context, GSS_C_NO_BUFFER);
! 324: (void)maj;
! 325: DEBUGASSERT(maj == GSS_S_COMPLETE);
! 326: }
! 327: }
! 328:
! 329: struct Curl_sec_client_mech Curl_krb5_client_mech = {
! 330: "GSSAPI",
! 331: sizeof(gss_ctx_id_t),
! 332: krb5_init,
! 333: krb5_auth,
! 334: krb5_end,
! 335: krb5_check_prot,
! 336: krb5_overhead,
! 337: krb5_encode,
! 338: krb5_decode
! 339: };
! 340:
! 341: #endif /* HAVE_GSSAPI && !CURL_DISABLE_FTP */
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