mapserver/cgiutil.c at master · lineCode/mapserver · GitHub

History

468 lines (399 loc) · 13.5 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

/******************************************************************************

* $Id$

* Project: MapServer

* Purpose: cgiRequestObj and CGI parameter parsing.

* Author: Steve Lime and the MapServer team.

* Notes: Portions derived from NCSA HTTPd Server's example CGI programs (util.c).

******************************************************************************

* Permission is hereby granted, free of charge, to any person obtaining a

* copy of this software and associated documentation files (the "Software"),

* to deal in the Software without restriction, including without limitation

* the rights to use, copy, modify, merge, publish, distribute, sublicense,

* and/or sell copies of the Software, and to permit persons to whom the

* Software is furnished to do so, subject to the following conditions:

* The above copyright notice and this permission notice shall be included in

* all copies of this Software or works derived from this Software.

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

* DEALINGS IN THE SOFTWARE.

****************************************************************************/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <ctype.h>

#include "mapserver.h"

#include "cgiutil.h"

#define LF 10

#define CR 13

int readPostBody( cgiRequestObj *request, char **data )

{

size_t data_max, data_len;

int chunk_size;

msIO_needBinaryStdin();

/* -------------------------------------------------------------------- */

/* If the length is provided, read in one gulp. */

/* -------------------------------------------------------------------- */

if( getenv("CONTENT_LENGTH") != NULL ) {

data_max = (size_t) atoi(getenv("CONTENT_LENGTH"));

/* Test for suspicious CONTENT_LENGTH (negative value or SIZE_MAX) */

if( data_max >= SIZE_MAX ) {

msIO_setHeader("Content-Type","text/html");

msIO_sendHeaders();

msIO_printf("Suspicious Content-Length.\n");

return MS_FAILURE;

}

*data = (char *) malloc(data_max+1);

if( *data == NULL ) {

msIO_setHeader("Content-Type","text/html");

msIO_sendHeaders();

msIO_printf("malloc() failed, Content-Length: %u unreasonably large?\n", (unsigned int)data_max );

return MS_FAILURE;

}

if( (int) msIO_fread(*data, 1, data_max, stdin) < data_max ) {

msIO_setHeader("Content-Type","text/html");

msIO_sendHeaders();

msIO_printf("POST body is short\n");

return MS_FAILURE;

}

(*data)[data_max] = '\0';

return MS_SUCCESS;

}

/* -------------------------------------------------------------------- */

/* Otherwise read in chunks to the end. */

/* -------------------------------------------------------------------- */

#define DATA_ALLOC_SIZE 10000

data_max = DATA_ALLOC_SIZE;

data_len = 0;

*data = (char *) msSmallMalloc(data_max+1);

while( (chunk_size = msIO_fread( *data + data_len, 1, data_max-data_len, stdin )) > 0 ) {

data_len += chunk_size;

if( data_len == data_max ) {

/* Realloc buffer, making sure we check for possible size_t overflow */

if ( data_max > SIZE_MAX - (DATA_ALLOC_SIZE+1) ) {

msIO_setHeader("Content-Type","text/html");

msIO_sendHeaders();

msIO_printf("Possible size_t overflow, cannot reallocate input buffer, POST body too large?\n" );

return MS_FAILURE;

}

data_max = data_max + DATA_ALLOC_SIZE;

*data = (char *) msSmallRealloc(*data, data_max+1);

}

(*data)[data_len] = '\0';

return MS_SUCCESS;

}

static char* msGetEnv(const char *name, void* thread_context)

{

return getenv(name);

}

int loadParams(cgiRequestObj *request,

char* (*getenv2)(const char*, void* thread_context),

char *raw_post_data,

ms_uint32 raw_post_data_length,

void* thread_context)

{

char *s, *queryString = NULL, *httpCookie = NULL;

int debuglevel;

int maxParams = MS_DEFAULT_CGI_PARAMS;

if (getenv2==NULL)

getenv2 = &msGetEnv;

if(getenv2("REQUEST_METHOD", thread_context)==NULL) {

msIO_printf("This script can only be used to decode form results and \n");

msIO_printf("should be initiated as a CGI process via a httpd server.\n");

msIO_printf("For other options please try using the --help switch.\n");

return -1;

}

debuglevel = (int)msGetGlobalDebugLevel();

if(strcmp(getenv2("REQUEST_METHOD", thread_context),"POST") == 0) { /* we've got a post from a form */

char *post_data;

int data_len;

request->type = MS_POST_REQUEST;

s = getenv2("CONTENT_TYPE", thread_context);

if (s != NULL)

request->contenttype = msStrdup(s);

/* we've to set default Content-Type which is

* application/octet-stream according to

* W3 RFC 2626 section 7.2.1 */

else request->contenttype = msStrdup("application/octet-stream");

if (raw_post_data) {

post_data = msStrdup(raw_post_data);

data_len = raw_post_data_length;

} else {

if(MS_SUCCESS != readPostBody( request, &post_data ))

return -1;

data_len = strlen(post_data);

}

/* if the content_type is application/x-www-form-urlencoded,

we have to parse it like the QUERY_STRING variable */

if(strncmp(request->contenttype, "application/x-www-form-urlencoded", strlen("application/x-www-form-urlencoded")) == 0) {

while( data_len > 0 && isspace(post_data[data_len-1]) )

post_data[--data_len] = '\0';

while( post_data[0] ) {

if(m >= maxParams) {

maxParams *= 2;

request->ParamNames = (char **) msSmallRealloc(request->ParamNames,sizeof(char *) * maxParams);

request->ParamValues = (char **) msSmallRealloc(request->ParamValues,sizeof(char *) * maxParams);

}

request->ParamValues[m] = makeword(post_data,'&');

plustospace(request->ParamValues[m]);

unescape_url(request->ParamValues[m]);

request->ParamNames[m] = makeword(request->ParamValues[m],'=');

m++;

}

free( post_data );

} else

request->postrequest = post_data;

/* check the QUERY_STRING even in the post request since it can contain

information. Eg a wfs request with */

s = getenv2("QUERY_STRING", thread_context);

if(s) {

if (debuglevel >= MS_DEBUGLEVEL_DEBUG)

msDebug("loadParams() QUERY_STRING: %s\n", s);

queryString = msStrdup(s);

for(x=0; queryString[0] != '\0'; x++) {

if(m >= maxParams) {

maxParams *= 2;

request->ParamNames = (char **) msSmallRealloc(request->ParamNames,sizeof(char *) * maxParams);

request->ParamValues = (char **) msSmallRealloc(request->ParamValues,sizeof(char *) * maxParams);

}

request->ParamValues[m] = makeword(queryString,'&');

plustospace(request->ParamValues[m]);

unescape_url(request->ParamValues[m]);

request->ParamNames[m] = makeword(request->ParamValues[m],'=');

m++;

}

} else {

if(strcmp(getenv2("REQUEST_METHOD", thread_context),"GET") == 0) { /* we've got a get request */

request->type = MS_GET_REQUEST;

s = getenv2("QUERY_STRING", thread_context);

if(s == NULL) {

msIO_setHeader("Content-Type","text/html");

msIO_sendHeaders();

msIO_printf("No query information to decode. QUERY_STRING not set.\n");

return -1;

}

if (debuglevel >= MS_DEBUGLEVEL_DEBUG)

msDebug("loadParams() QUERY_STRING: %s\n", s);

if(strlen(s)==0) {

msIO_setHeader("Content-Type","text/html");

msIO_sendHeaders();

msIO_printf("No query information to decode. QUERY_STRING is set, but empty.\n");

return -1;

}

/* don't modify the string returned by getenv2 */

queryString = msStrdup(s);

for(x=0; queryString[0] != '\0'; x++) {

if(m >= maxParams) {

maxParams *= 2;

request->ParamNames = (char **) msSmallRealloc(request->ParamNames,sizeof(char *) * maxParams);

request->ParamValues = (char **) msSmallRealloc(request->ParamValues,sizeof(char *) * maxParams);

}

request->ParamValues[m] = makeword(queryString,'&');

plustospace(request->ParamValues[m]);

unescape_url(request->ParamValues[m]);

request->ParamNames[m] = makeword(request->ParamValues[m],'=');

m++;

}

} else {

msIO_setHeader("Content-Type","text/html");

msIO_sendHeaders();

msIO_printf("This script should be referenced with a METHOD of GET or METHOD of POST.\n");

return -1;

}

/* check for any available cookies */

s = getenv2("HTTP_COOKIE", thread_context);

if(s != NULL) {

httpCookie = msStrdup(s);

request->httpcookiedata = msStrdup(s);

for(x=0; httpCookie[0] != '\0'; x++) {

if(m >= maxParams) {

maxParams *= 2;

request->ParamNames = (char **) msSmallRealloc(request->ParamNames,sizeof(char *) * maxParams);

request->ParamValues = (char **) msSmallRealloc(request->ParamValues,sizeof(char *) * maxParams);

}

request->ParamValues[m] = makeword(httpCookie,';');

plustospace(request->ParamValues[m]);

unescape_url(request->ParamValues[m]);

request->ParamNames[m] = makeword_skip(request->ParamValues[m],'=',' ');

m++;

}

if (queryString)

free(queryString);

if (httpCookie)

free(httpCookie);

return(m);

}

void getword(char *word, char *line, char stop)

{

int x = 0,y;

for(x=0; ((line[x]) && (line[x] != stop)); x++)

word[x] = line[x];

word[x] = '\0';

if(line[x]) ++x;

y=0;

while((line[y++] = line[x++]));

}

char *makeword_skip(char *line, char stop, char skip)

{

int x = 0,y,offset=0;

char *word = (char *) msSmallMalloc(sizeof(char) * (strlen(line) + 1));

for(x=0; ((line[x]) && (line[x] == skip)); x++);

offset = x;

for(x=offset; ((line[x]) && (line[x] != stop)); x++)

word[x-offset] = line[x];

word[x-offset] = '\0';

if(line[x]) ++x;

y=0;

while((line[y++] = line[x++]));

return word;

}

char *makeword(char *line, char stop)

{

int x = 0,y;

char *word = (char *) msSmallMalloc(sizeof(char) * (strlen(line) + 1));

for(x=0; ((line[x]) && (line[x] != stop)); x++)

word[x] = line[x];

word[x] = '\0';

if(line[x]) ++x;

y=0;

while((line[y++] = line[x++]));

return word;

}

char *fmakeword(FILE *f, char stop, int *cl)

{

int wsize;

char *word;

int ll;

wsize = 102400;

ll=0;

word = (char *) msSmallMalloc(sizeof(char) * (wsize + 1));

while(1) {

word[ll] = (char)fgetc(f);

if(ll==wsize) {

word[ll+1] = '\0';

wsize+=102400;

word = (char *)msSmallRealloc(word,sizeof(char)*(wsize+1));

}

--(*cl);

if((word[ll] == stop) || (feof(f)) || (!(*cl))) {

if(word[ll] != stop) ll++;

word[ll] = '\0';

word = (char *) msSmallRealloc(word, ll+1);

return word;

}

++ll;

}

char x2c(char *what)

{

digit = (what[0] >= 'A' ? ((what[0] & 0xdf) - 'A')+10 : (what[0] - '0'));

digit *= 16;

digit += (what[1] >= 'A' ? ((what[1] & 0xdf) - 'A')+10 : (what[1] - '0'));

return(digit);

}

void unescape_url(char *url)

{

for(x=0,y=0; url[y]; ++x,++y) {

if((url[x] = url[y]) == '%') {

url[x] = x2c(&url[y+1]);

y+=2;

}

url[x] = '\0';

}

void plustospace(char *str)

{

for(x=0; str[x]; x++) if(str[x] == '+') str[x] = ' ';

}

int rind(char *s, char c)

{

for(x=strlen(s) - 1; x != -1; x--)

if(s[x] == c) return x;

return -1;

}

void send_fd(FILE *f, FILE *fd)

{

int c;

while (1) {

c = fgetc(f);

if(c == EOF)

return;

fputc((char)c,fd);

}

int ind(char *s, char c)

{

for(x=0; s[x]; x++)

if(s[x] == c) return x;

return -1;

}

** patched version according to CERT advisory...

void escape_shell_cmd(char *cmd)

{

l=strlen(cmd);

for(x=0; cmd[x]; x++) {

if(ind("&;`'\"|*?~<>^()[]{}$\\\n",cmd[x]) != -1) {

for(y=l+1; y>x; y--)

cmd[y] = cmd[y-1];

l++; /* length has been increased */

cmd[x] = '\\';

x++; /* skip the character */

}

** Allocate a new request holder structure

cgiRequestObj *msAllocCgiObj()

{

cgiRequestObj *request = (cgiRequestObj *)malloc(sizeof(cgiRequestObj));

if(!request)

return NULL;

request->ParamNames = (char **) msSmallMalloc(MS_DEFAULT_CGI_PARAMS*sizeof(char*));

request->ParamValues = (char **) msSmallMalloc(MS_DEFAULT_CGI_PARAMS*sizeof(char*));

request->NumParams = 0;

request->type = MS_GET_REQUEST;

request->contenttype = NULL;

request->postrequest = NULL;

request->httpcookiedata = NULL;

return request;

}

void msFreeCgiObj(cgiRequestObj *request)

{

msFreeCharArray(request->ParamNames, request->NumParams);

msFreeCharArray(request->ParamValues, request->NumParams);

request->ParamNames = NULL;

request->ParamValues = NULL;

request->NumParams = 0;

request->type = -1;

msFree(request->contenttype);

msFree(request->postrequest);

msFree(request->httpcookiedata);

request->contenttype = NULL;

request->postrequest = NULL;

request->httpcookiedata = NULL;

msFree(request);

}

mapserver/cgiutil.c at master · lineCode/mapserver · GitHub

Expand file tree

Breadcrumbs

cgiutil.c

Latest commit

History

Breadcrumbs

cgiutil.c

File metadata and controls