crypto/conf/conf.c

   1 /* crypto/conf/conf.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <errno.h>
  61 #include "cryptlib.h"
  62 #include <openssl/stack.h>
  63 #include <openssl/lhash.h>
  64 #include <openssl/conf.h>
  65 #include <openssl/buffer.h>
  66 #include <openssl/err.h>
  67
  68 #include "conf_lcl.h"
  69
  70 static void value_free_hash(CONF_VALUE *a, LHASH *conf);
  71 static void value_free_stack(CONF_VALUE *a,LHASH *conf);
  72 static unsigned long hash(CONF_VALUE *v);
  73 static int cmp(CONF_VALUE *a,CONF_VALUE *b);
  74 static char *eat_ws(char *p);
  75 static char *eat_alpha_numeric(char *p);
  76 static void clear_comments(char *p);
  77 static int str_copy(LHASH *conf,char *section,char **to, char *from);
  78 static char *scan_quote(char *p);
  79 static CONF_VALUE *new_section(LHASH *conf,char *section);
  80 static CONF_VALUE *get_section(LHASH *conf,char *section);
  81 #define scan_esc(p)     ((((p)[1] == '\0')?(p++):(p+=2)),p)
  82
  83 const char *CONF_version="CONF" OPENSSL_VERSION_PTEXT;
  84
  85 LHASH *CONF_load(LHASH *h, char *file, long *line)
  86         {
  87         LHASH *ret=NULL;
  88         FILE *in=NULL;
  89 #define BUFSIZE 512
  90         char btmp[16];
  91         int bufnum=0,i,ii;
  92         BUF_MEM *buff=NULL;
  93         char *s,*p,*end;
  94         int again,n;
  95         long eline=0;
  96         CONF_VALUE *v=NULL,*vv,*tv;
  97         CONF_VALUE *sv=NULL;
  98         char *section=NULL,*buf;
  99         STACK *section_sk=NULL,*ts;
 100         char *start,*psection,*pname;
 101
 102         if ((buff=BUF_MEM_new()) == NULL)
 103                 {
 104                 CONFerr(CONF_F_CONF_LOAD,ERR_R_BUF_LIB);
 105                 goto err;
 106                 }
 107
 108 #ifdef VMS
 109         in=fopen(file,"r");
 110 #else
 111         in=fopen(file,"rb");
 112 #endif
 113         if (in == NULL)
 114                 {
 115                 SYSerr(SYS_F_FOPEN,get_last_sys_error());
 116                 ERR_set_error_data(BUF_strdup(file),
 117                         ERR_TXT_MALLOCED|ERR_TXT_STRING);
 118                 CONFerr(CONF_F_CONF_LOAD,ERR_R_SYS_LIB);
 119                 goto err;
 120                 }
 121
 122         section=(char *)Malloc(10);
 123         if (section == NULL)
 124                 {
 125                 CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 126                 goto err;
 127                 }
 128         strcpy(section,"default");
 129
 130         if (h == NULL)
 131                 {
 132                 if ((ret=lh_new(hash,cmp)) == NULL)
 133                         {
 134                         CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 135                         goto err;
 136                         }
 137                 }
 138         else
 139                 ret=h;
 140
 141         sv=new_section(ret,section);
 142         if (sv == NULL)
 143                 {
 144                 CONFerr(CONF_F_CONF_LOAD,CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 145                 goto err;
 146                 }
 147         section_sk=(STACK *)sv->value;
 148
 149         bufnum=0;
 150         for (;;)
 151                 {
 152                 again=0;
 153                 if (!BUF_MEM_grow(buff,bufnum+BUFSIZE))
 154                         {
 155                         CONFerr(CONF_F_CONF_LOAD,ERR_R_BUF_LIB);
 156                         goto err;
 157                         }
 158                 p= &(buff->data[bufnum]);
 159                 *p='\0';
 160                 fgets(p,BUFSIZE-1,in);
 161                 p[BUFSIZE-1]='\0';
 162                 ii=i=strlen(p);
 163                 if (i == 0) break;
 164                 while (i > 0)
 165                         {
 166                         if ((p[i-1] != '\r') && (p[i-1] != '\n'))
 167                                 break;
 168                         else
 169                                 i--;
 170                         }
 171                 /* we removed some trailing stuff so there is a new
 172                  * line on the end. */
 173                 if (i == ii)
 174                         again=1; /* long line */
 175                 else
 176                         {
 177                         p[i]='\0';
 178                         eline++; /* another input line */
 179                         }
 180
 181                 /* we now have a line with trailing \r\n removed */
 182
 183                 /* i is the number of bytes */
 184                 bufnum+=i;
 185
 186                 v=NULL;
 187                 /* check for line continuation */
 188                 if (bufnum >= 1)
 189                         {
 190                         /* If we have bytes and the last char '\\' and
 191                          * second last char is not '\\' */
 192                         p= &(buff->data[bufnum-1]);
 193                         if (    IS_ESC(p[0]) &&
 194                                 ((bufnum <= 1) || !IS_ESC(p[-1])))
 195                                 {
 196                                 bufnum--;
 197                                 again=1;
 198                                 }
 199                         }
 200                 if (again) continue;
 201                 bufnum=0;
 202                 buf=buff->data;
 203
 204                 clear_comments(buf);
 205                 n=strlen(buf);
 206                 s=eat_ws(buf);
 207                 if (IS_EOF(*s)) continue; /* blank line */
 208                 if (*s == '[')
 209                         {
 210                         char *ss;
 211
 212                         s++;
 213                         start=eat_ws(s);
 214                         ss=start;
 215 again:
 216                         end=eat_alpha_numeric(ss);
 217                         p=eat_ws(end);
 218                         if (*p != ']')
 219                                 {
 220                                 if (*p != '\0')
 221                                         {
 222                                         ss=p;
 223                                         goto again;
 224                                         }
 225                                 CONFerr(CONF_F_CONF_LOAD,CONF_R_MISSING_CLOSE_SQUARE_BRACKET);
 226                                 goto err;
 227                                 }
 228                         *end='\0';
 229                         if (!str_copy(ret,NULL,&section,start)) goto err;
 230                         if ((sv=get_section(ret,section)) == NULL)
 231                                 sv=new_section(ret,section);
 232                         if (sv == NULL)
 233                                 {
 234                                 CONFerr(CONF_F_CONF_LOAD,CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 235                                 goto err;
 236                                 }
 237                         section_sk=(STACK *)sv->value;
 238                         continue;
 239                         }
 240                 else
 241                         {
 242                         pname=s;
 243                         psection=NULL;
 244                         end=eat_alpha_numeric(s);
 245                         if ((end[0] == ':') && (end[1] == ':'))
 246                                 {
 247                                 *end='\0';
 248                                 end+=2;
 249                                 psection=pname;
 250                                 pname=end;
 251                                 end=eat_alpha_numeric(end);
 252                                 }
 253                         p=eat_ws(end);
 254                         if (*p != '=')
 255                                 {
 256                                 CONFerr(CONF_F_CONF_LOAD,CONF_R_MISSING_EQUAL_SIGN);
 257                                 goto err;
 258                                 }
 259                         *end='\0';
 260                         p++;
 261                         start=eat_ws(p);
 262                         while (!IS_EOF(*p))
 263                                 p++;
 264                         p--;
 265                         while ((p != start) && (IS_WS(*p)))
 266                                 p--;
 267                         p++;
 268                         *p='\0';
 269
 270                         if ((v=(CONF_VALUE *)Malloc(sizeof(CONF_VALUE))) == NULL)
 271                                 {
 272                                 CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 273                                 goto err;
 274                                 }
 275                         if (psection == NULL) psection=section;
 276                         v->name=(char *)Malloc(strlen(pname)+1);
 277                         v->value=NULL;
 278                         if (v->name == NULL)
 279                                 {
 280                                 CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 281                                 goto err;
 282                                 }
 283                         strcpy(v->name,pname);
 284                         if (!str_copy(ret,psection,&(v->value),start)) goto err;
 285
 286                         if (strcmp(psection,section) != 0)
 287                                 {
 288                                 if ((tv=get_section(ret,psection))
 289                                         == NULL)
 290                                         tv=new_section(ret,psection);
 291                                 if (tv == NULL)
 292                                         {
 293                                         CONFerr(CONF_F_CONF_LOAD,CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 294                                         goto err;
 295                                         }
 296                                 ts=(STACK *)tv->value;
 297                                 }
 298                         else
 299                                 {
 300                                 tv=sv;
 301                                 ts=section_sk;
 302                                 }
 303                         v->section=tv->section;
 304                         if (!sk_push(ts,(char *)v))
 305                                 {
 306                                 CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 307                                 goto err;
 308                                 }
 309                         vv=(CONF_VALUE *)lh_insert(ret,(char *)v);
 310                         if (vv != NULL)
 311                                 {
 312                                 sk_delete_ptr(ts,(char *)vv);
 313                                 Free(vv->name);
 314                                 Free(vv->value);
 315                                 Free(vv);
 316                                 }
 317                         v=NULL;
 318                         }
 319                 }
 320         if (buff != NULL) BUF_MEM_free(buff);
 321         if (section != NULL) Free(section);
 322         if (in != NULL) fclose(in);
 323         return(ret);
 324 err:
 325         if (buff != NULL) BUF_MEM_free(buff);
 326         if (section != NULL) Free(section);
 327         if (line != NULL) *line=eline;
 328         sprintf(btmp,"%ld",eline);
 329         ERR_add_error_data(2,"line ",btmp);
 330         if (in != NULL) fclose(in);
 331         if ((h != ret) && (ret != NULL)) CONF_free(ret);
 332         if (v != NULL)
 333                 {
 334                 if (v->name != NULL) Free(v->name);
 335                 if (v->value != NULL) Free(v->value);
 336                 if (v != NULL) Free(v);
 337                 }
 338         return(NULL);
 339         }
 340
 341 char *CONF_get_string(LHASH *conf, char *section, char *name)
 342         {
 343         CONF_VALUE *v,vv;
 344         char *p;
 345
 346         if (name == NULL) return(NULL);
 347         if (conf != NULL)
 348                 {
 349                 if (section != NULL)
 350                         {
 351                         vv.name=name;
 352                         vv.section=section;
 353                         v=(CONF_VALUE *)lh_retrieve(conf,(char *)&vv);
 354                         if (v != NULL) return(v->value);
 355                         if (strcmp(section,"ENV") == 0)
 356                                 {
 357                                 p=Getenv(name);
 358                                 if (p != NULL) return(p);
 359                                 }
 360                         }
 361                 vv.section=BUF_strdup("default");
 362                 vv.name=name;
 363                 v=(CONF_VALUE *)lh_retrieve(conf,(char *)&vv);
 364                 if (v != NULL)
 365                         return(v->value);
 366                 else
 367                         return(NULL);
 368                 }
 369         else
 370                 return(Getenv(name));
 371         }
 372
 373 static CONF_VALUE *get_section(LHASH *conf, char *section)
 374         {
 375         CONF_VALUE *v,vv;
 376
 377         if ((conf == NULL) || (section == NULL)) return(NULL);
 378         vv.name=NULL;
 379         vv.section=section;
 380         v=(CONF_VALUE *)lh_retrieve(conf,(char *)&vv);
 381         return(v);
 382         }
 383
 384 STACK *CONF_get_section(LHASH *conf, char *section)
 385         {
 386         CONF_VALUE *v;
 387
 388         v=get_section(conf,section);
 389         if (v != NULL)
 390                 return((STACK *)v->value);
 391         else
 392                 return(NULL);
 393         }
 394
 395 long CONF_get_number(LHASH *conf, char *section, char *name)
 396         {
 397         char *str;
 398         long ret=0;
 399
 400         str=CONF_get_string(conf,section,name);
 401         if (str == NULL) return(0);
 402         for (;;)
 403                 {
 404                 if (IS_NUMER(*str))
 405                         ret=ret*10+(*str -'0');
 406                 else
 407                         return(ret);
 408                 str++;
 409                 }
 410         }
 411
 412 void CONF_free(LHASH *conf)
 413         {
 414         if (conf == NULL) return;
 415
 416         conf->down_load=0;      /* evil thing to make sure the 'Free()'
 417                                  * works as expected */
 418         lh_doall_arg(conf,(void (*)())value_free_hash,(char *)conf);
 419
 420         /* We now have only 'section' entries in the hash table.
 421          * Due to problems with */
 422
 423         lh_doall_arg(conf,(void (*)())value_free_stack,(char *)conf);
 424         lh_free(conf);
 425         }
 426
 427 static void value_free_hash(CONF_VALUE *a, LHASH *conf)
 428         {
 429         if (a->name != NULL)
 430                 {
 431                 a=(CONF_VALUE *)lh_delete(conf,(char *)a);
 432                 }
 433         }
 434
 435 static void value_free_stack(CONF_VALUE *a, LHASH *conf)
 436         {
 437         CONF_VALUE *vv;
 438         STACK *sk;
 439         int i;
 440
 441         if (a->name != NULL) return;
 442
 443         sk=(STACK *)a->value;
 444         for (i=sk_num(sk)-1; i>=0; i--)
 445                 {
 446                 vv=(CONF_VALUE *)sk_value(sk,i);
 447                 Free(vv->value);
 448                 Free(vv->name);
 449                 Free(vv);
 450                 }
 451         if (sk != NULL) sk_free(sk);
 452         Free(a->section);
 453         Free(a);
 454         }
 455
 456 static void clear_comments(char *p)
 457         {
 458         char *to;
 459
 460         to=p;
 461         for (;;)
 462                 {
 463                 if (IS_COMMENT(*p))
 464                         {
 465                         *p='\0';
 466                         return;
 467                         }
 468                 if (IS_QUOTE(*p))
 469                         {
 470                         p=scan_quote(p);
 471                         continue;
 472                         }
 473                 if (IS_ESC(*p))
 474                         {
 475                         p=scan_esc(p);
 476                         continue;
 477                         }
 478                 if (IS_EOF(*p))
 479                         return;
 480                 else
 481                         p++;
 482                 }
 483         }
 484
 485 static int str_copy(LHASH *conf, char *section, char **pto, char *from)
 486         {
 487         int q,r,rr=0,to=0,len=0;
 488         char *s,*e,*rp,*p,*rrp,*np,*cp,v;
 489         BUF_MEM *buf;
 490
 491         if ((buf=BUF_MEM_new()) == NULL) return(0);
 492
 493         len=strlen(from)+1;
 494         if (!BUF_MEM_grow(buf,len)) goto err;
 495
 496         for (;;)
 497                 {
 498                 if (IS_QUOTE(*from))
 499                         {
 500                         q= *from;
 501                         from++;
 502                         while ((*from != '\0') && (*from != q))
 503                                 {
 504                                 if (*from == '\\')
 505                                         {
 506                                         from++;
 507                                         if (*from == '\0') break;
 508                                         }
 509                                 buf->data[to++]= *(from++);
 510                                 }
 511                         }
 512                 else if (*from == '\\')
 513                         {
 514                         from++;
 515                         v= *(from++);
 516                         if (v == '\0') break;
 517                         else if (v == 'r') v='\r';
 518                         else if (v == 'n') v='\n';
 519                         else if (v == 'b') v='\b';
 520                         else if (v == 't') v='\t';
 521                         buf->data[to++]= v;
 522                         }
 523                 else if (*from == '\0')
 524                         break;
 525                 else if (*from == '$')
 526                         {
 527                         /* try to expand it */
 528                         rrp=NULL;
 529                         s= &(from[1]);
 530                         if (*s == '{')
 531                                 q='}';
 532                         else if (*s == '(')
 533                                 q=')';
 534                         else q=0;
 535
 536                         if (q) s++;
 537                         cp=section;
 538                         e=np=s;
 539                         while (IS_ALPHA_NUMERIC(*e))
 540                                 e++;
 541                         if ((e[0] == ':') && (e[1] == ':'))
 542                                 {
 543                                 cp=np;
 544                                 rrp=e;
 545                                 rr= *e;
 546                                 *rrp='\0';
 547                                 e+=2;
 548                                 np=e;
 549                                 while (IS_ALPHA_NUMERIC(*e))
 550                                         e++;
 551                                 }
 552                         r= *e;
 553                         *e='\0';
 554                         rp=e;
 555                         if (q)
 556                                 {
 557                                 if (r != q)
 558                                         {
 559                                         CONFerr(CONF_F_STR_COPY,CONF_R_NO_CLOSE_BRACE);
 560                                         goto err;
 561                                         }
 562                                 e++;
 563                                 }
 564                         /* So at this point we have
 565                          * ns which is the start of the name string which is
 566                          *   '\0' terminated.
 567                          * cs which is the start of the section string which is
 568                          *   '\0' terminated.
 569                          * e is the 'next point after'.
 570                          * r and s are the chars replaced by the '\0'
 571                          * rp and sp is where 'r' and 's' came from.
 572                          */
 573                         p=CONF_get_string(conf,cp,np);
 574                         if (rrp != NULL) *rrp=rr;
 575                         *rp=r;
 576                         if (p == NULL)
 577                                 {
 578                                 CONFerr(CONF_F_STR_COPY,CONF_R_VARIABLE_HAS_NO_VALUE);
 579                                 goto err;
 580                                 }
 581                         BUF_MEM_grow(buf,(strlen(p)+len-(e-from)));
 582                         while (*p)
 583                                 buf->data[to++]= *(p++);
 584                         from=e;
 585                         }
 586                 else
 587                         buf->data[to++]= *(from++);
 588                 }
 589         buf->data[to]='\0';
 590         if (*pto != NULL) Free(*pto);
 591         *pto=buf->data;
 592         Free(buf);
 593         return(1);
 594 err:
 595         if (buf != NULL) BUF_MEM_free(buf);
 596         return(0);
 597         }
 598
 599 static char *eat_ws(char *p)
 600         {
 601         while (IS_WS(*p) && (!IS_EOF(*p)))
 602                 p++;
 603         return(p);
 604         }
 605
 606 static char *eat_alpha_numeric(char *p)
 607         {
 608         for (;;)
 609                 {
 610                 if (IS_ESC(*p))
 611                         {
 612                         p=scan_esc(p);
 613                         continue;
 614                         }
 615                 if (!IS_ALPHA_NUMERIC_PUNCT(*p))
 616                         return(p);
 617                 p++;
 618                 }
 619         }
 620
 621 static unsigned long hash(CONF_VALUE *v)
 622         {
 623         return((lh_strhash(v->section)<<2)^lh_strhash(v->name));
 624         }
 625
 626 static int cmp(CONF_VALUE *a, CONF_VALUE *b)
 627         {
 628         int i;
 629
 630         if (a->section != b->section)
 631                 {
 632                 i=strcmp(a->section,b->section);
 633                 if (i) return(i);
 634                 }
 635
 636         if ((a->name != NULL) && (b->name != NULL))
 637                 {
 638                 i=strcmp(a->name,b->name);
 639                 return(i);
 640                 }
 641         else if (a->name == b->name)
 642                 return(0);
 643         else
 644                 return((a->name == NULL)?-1:1);
 645         }
 646
 647 static char *scan_quote(char *p)
 648         {
 649         int q= *p;
 650
 651         p++;
 652         while (!(IS_EOF(*p)) && (*p != q))
 653                 {
 654                 if (IS_ESC(*p))
 655                         {
 656                         p++;
 657                         if (IS_EOF(*p)) return(p);
 658                         }
 659                 p++;
 660                 }
 661         if (*p == q) p++;
 662         return(p);
 663         }
 664
 665 static CONF_VALUE *new_section(LHASH *conf, char *section)
 666         {
 667         STACK *sk=NULL;
 668         int ok=0,i;
 669         CONF_VALUE *v=NULL,*vv;
 670
 671         if ((sk=sk_new_null()) == NULL)
 672                 goto err;
 673         if ((v=(CONF_VALUE *)Malloc(sizeof(CONF_VALUE))) == NULL)
 674                 goto err;
 675         i=strlen(section)+1;
 676         if ((v->section=(char *)Malloc(i)) == NULL)
 677                 goto err;
 678
 679         memcpy(v->section,section,i);
 680         v->name=NULL;
 681         v->value=(char *)sk;
 682
 683         vv=(CONF_VALUE *)lh_insert(conf,(char *)v);
 684         if (vv != NULL)
 685                 {
 686 #if !defined(NO_STDIO) && !defined(WIN16)
 687                 fprintf(stderr,"internal fault\n");
 688 #endif
 689                 abort();
 690                 }
 691         ok=1;
 692 err:
 693         if (!ok)
 694                 {
 695                 if (sk != NULL) sk_free(sk);
 696                 if (v != NULL) Free(v);
 697                 v=NULL;
 698                 }
 699         return(v);
 700         }