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         in=fopen(file,"rb");
 109         if (in == NULL)
 110                 {
 111                 SYSerr(SYS_F_FOPEN,get_last_sys_error());
 112                 ERR_set_error_data(BUF_strdup(file),
 113                         ERR_TXT_MALLOCED|ERR_TXT_STRING);
 114                 CONFerr(CONF_F_CONF_LOAD,ERR_R_SYS_LIB);
 115                 goto err;
 116                 }
 117
 118         section=(char *)Malloc(10);
 119         if (section == NULL)
 120                 {
 121                 CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 122                 goto err;
 123                 }
 124         strcpy(section,"default");
 125
 126         if (h == NULL)
 127                 {
 128                 if ((ret=lh_new(hash,cmp)) == NULL)
 129                         {
 130                         CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 131                         goto err;
 132                         }
 133                 }
 134         else
 135                 ret=h;
 136
 137         sv=new_section(ret,section);
 138         if (sv == NULL)
 139                 {
 140                 CONFerr(CONF_F_CONF_LOAD,CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 141                 goto err;
 142                 }
 143         section_sk=(STACK *)sv->value;
 144
 145         bufnum=0;
 146         for (;;)
 147                 {
 148                 again=0;
 149                 if (!BUF_MEM_grow(buff,bufnum+BUFSIZE))
 150                         {
 151                         CONFerr(CONF_F_CONF_LOAD,ERR_R_BUF_LIB);
 152                         goto err;
 153                         }
 154                 p= &(buff->data[bufnum]);
 155                 *p='\0';
 156                 fgets(p,BUFSIZE-1,in);
 157                 p[BUFSIZE-1]='\0';
 158                 ii=i=strlen(p);
 159                 if (i == 0) break;
 160                 while (i > 0)
 161                         {
 162                         if ((p[i-1] != '\r') && (p[i-1] != '\n'))
 163                                 break;
 164                         else
 165                                 i--;
 166                         }
 167                 /* we removed some trailing stuff so there is a new
 168                  * line on the end. */
 169                 if (i == ii)
 170                         again=1; /* long line */
 171                 else
 172                         {
 173                         p[i]='\0';
 174                         eline++; /* another input line */
 175                         }
 176
 177                 /* we now have a line with trailing \r\n removed */
 178
 179                 /* i is the number of bytes */
 180                 bufnum+=i;
 181
 182                 v=NULL;
 183                 /* check for line continuation */
 184                 if (bufnum >= 1)
 185                         {
 186                         /* If we have bytes and the last char '\\' and
 187                          * second last char is not '\\' */
 188                         p= &(buff->data[bufnum-1]);
 189                         if (    IS_ESC(p[0]) &&
 190                                 ((bufnum <= 1) || !IS_ESC(p[-1])))
 191                                 {
 192                                 bufnum--;
 193                                 again=1;
 194                                 }
 195                         }
 196                 if (again) continue;
 197                 bufnum=0;
 198                 buf=buff->data;
 199
 200                 clear_comments(buf);
 201                 n=strlen(buf);
 202                 s=eat_ws(buf);
 203                 if (IS_EOF(*s)) continue; /* blank line */
 204                 if (*s == '[')
 205                         {
 206                         char *ss;
 207
 208                         s++;
 209                         start=eat_ws(s);
 210                         ss=start;
 211 again:
 212                         end=eat_alpha_numeric(ss);
 213                         p=eat_ws(end);
 214                         if (*p != ']')
 215                                 {
 216                                 if (*p != '\0')
 217                                         {
 218                                         ss=p;
 219                                         goto again;
 220                                         }
 221                                 CONFerr(CONF_F_CONF_LOAD,CONF_R_MISSING_CLOSE_SQUARE_BRACKET);
 222                                 goto err;
 223                                 }
 224                         *end='\0';
 225                         if (!str_copy(ret,NULL,&section,start)) goto err;
 226                         if ((sv=get_section(ret,section)) == NULL)
 227                                 sv=new_section(ret,section);
 228                         if (sv == NULL)
 229                                 {
 230                                 CONFerr(CONF_F_CONF_LOAD,CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 231                                 goto err;
 232                                 }
 233                         section_sk=(STACK *)sv->value;
 234                         continue;
 235                         }
 236                 else
 237                         {
 238                         pname=s;
 239                         psection=NULL;
 240                         end=eat_alpha_numeric(s);
 241                         if ((end[0] == ':') && (end[1] == ':'))
 242                                 {
 243                                 *end='\0';
 244                                 end+=2;
 245                                 psection=pname;
 246                                 pname=end;
 247                                 end=eat_alpha_numeric(end);
 248                                 }
 249                         p=eat_ws(end);
 250                         if (*p != '=')
 251                                 {
 252                                 CONFerr(CONF_F_CONF_LOAD,CONF_R_MISSING_EQUAL_SIGN);
 253                                 goto err;
 254                                 }
 255                         *end='\0';
 256                         p++;
 257                         start=eat_ws(p);
 258                         while (!IS_EOF(*p))
 259                                 p++;
 260                         p--;
 261                         while ((p != start) && (IS_WS(*p)))
 262                                 p--;
 263                         p++;
 264                         *p='\0';
 265
 266                         if ((v=(CONF_VALUE *)Malloc(sizeof(CONF_VALUE))) == NULL)
 267                                 {
 268                                 CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 269                                 goto err;
 270                                 }
 271                         if (psection == NULL) psection=section;
 272                         v->name=(char *)Malloc(strlen(pname)+1);
 273                         v->value=NULL;
 274                         if (v->name == NULL)
 275                                 {
 276                                 CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 277                                 goto err;
 278                                 }
 279                         strcpy(v->name,pname);
 280                         if (!str_copy(ret,psection,&(v->value),start)) goto err;
 281
 282                         if (strcmp(psection,section) != 0)
 283                                 {
 284                                 if ((tv=get_section(ret,psection))
 285                                         == NULL)
 286                                         tv=new_section(ret,psection);
 287                                 if (tv == NULL)
 288                                         {
 289                                         CONFerr(CONF_F_CONF_LOAD,CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 290                                         goto err;
 291                                         }
 292                                 ts=(STACK *)tv->value;
 293                                 }
 294                         else
 295                                 {
 296                                 tv=sv;
 297                                 ts=section_sk;
 298                                 }
 299                         v->section=tv->section;
 300                         if (!sk_push(ts,(char *)v))
 301                                 {
 302                                 CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
 303                                 goto err;
 304                                 }
 305                         vv=(CONF_VALUE *)lh_insert(ret,(char *)v);
 306                         if (vv != NULL)
 307                                 {
 308                                 sk_delete_ptr(ts,(char *)vv);
 309                                 Free(vv->name);
 310                                 Free(vv->value);
 311                                 Free(vv);
 312                                 }
 313                         v=NULL;
 314                         }
 315                 }
 316         if (buff != NULL) BUF_MEM_free(buff);
 317         if (section != NULL) Free(section);
 318         if (in != NULL) fclose(in);
 319         return(ret);
 320 err:
 321         if (buff != NULL) BUF_MEM_free(buff);
 322         if (section != NULL) Free(section);
 323         if (line != NULL) *line=eline;
 324         sprintf(btmp,"%ld",eline);
 325         ERR_add_error_data(2,"line ",btmp);
 326         if (in != NULL) fclose(in);
 327         if ((h != ret) && (ret != NULL)) CONF_free(ret);
 328         if (v != NULL)
 329                 {
 330                 if (v->name != NULL) Free(v->name);
 331                 if (v->value != NULL) Free(v->value);
 332                 if (v != NULL) Free(v);
 333                 }
 334         return(NULL);
 335         }
 336
 337 char *CONF_get_string(LHASH *conf, char *section, char *name)
 338         {
 339         CONF_VALUE *v,vv;
 340         char *p;
 341
 342         if (name == NULL) return(NULL);
 343         if (conf != NULL)
 344                 {
 345                 if (section != NULL)
 346                         {
 347                         vv.name=name;
 348                         vv.section=section;
 349                         v=(CONF_VALUE *)lh_retrieve(conf,(char *)&vv);
 350                         if (v != NULL) return(v->value);
 351                         if (strcmp(section,"ENV") == 0)
 352                                 {
 353                                 p=Getenv(name);
 354                                 if (p != NULL) return(p);
 355                                 }
 356                         }
 357                 vv.section=BUF_strdup("default");
 358                 vv.name=name;
 359                 v=(CONF_VALUE *)lh_retrieve(conf,(char *)&vv);
 360                 if (v != NULL)
 361                         return(v->value);
 362                 else
 363                         return(NULL);
 364                 }
 365         else
 366                 return(Getenv(name));
 367         }
 368
 369 static CONF_VALUE *get_section(LHASH *conf, char *section)
 370         {
 371         CONF_VALUE *v,vv;
 372
 373         if ((conf == NULL) || (section == NULL)) return(NULL);
 374         vv.name=NULL;
 375         vv.section=section;
 376         v=(CONF_VALUE *)lh_retrieve(conf,(char *)&vv);
 377         return(v);
 378         }
 379
 380 STACK *CONF_get_section(LHASH *conf, char *section)
 381         {
 382         CONF_VALUE *v;
 383
 384         v=get_section(conf,section);
 385         if (v != NULL)
 386                 return((STACK *)v->value);
 387         else
 388                 return(NULL);
 389         }
 390
 391 long CONF_get_number(LHASH *conf, char *section, char *name)
 392         {
 393         char *str;
 394         long ret=0;
 395
 396         str=CONF_get_string(conf,section,name);
 397         if (str == NULL) return(0);
 398         for (;;)
 399                 {
 400                 if (IS_NUMER(*str))
 401                         ret=ret*10+(*str -'0');
 402                 else
 403                         return(ret);
 404                 str++;
 405                 }
 406         }
 407
 408 void CONF_free(LHASH *conf)
 409         {
 410         if (conf == NULL) return;
 411
 412         conf->down_load=0;      /* evil thing to make sure the 'Free()'
 413                                  * works as expected */
 414         lh_doall_arg(conf,(void (*)())value_free_hash,(char *)conf);
 415
 416         /* We now have only 'section' entries in the hash table.
 417          * Due to problems with */
 418
 419         lh_doall_arg(conf,(void (*)())value_free_stack,(char *)conf);
 420         lh_free(conf);
 421         }
 422
 423 static void value_free_hash(CONF_VALUE *a, LHASH *conf)
 424         {
 425         if (a->name != NULL)
 426                 {
 427                 a=(CONF_VALUE *)lh_delete(conf,(char *)a);
 428                 }
 429         }
 430
 431 static void value_free_stack(CONF_VALUE *a, LHASH *conf)
 432         {
 433         CONF_VALUE *vv;
 434         STACK *sk;
 435         int i;
 436
 437         if (a->name != NULL) return;
 438
 439         sk=(STACK *)a->value;
 440         for (i=sk_num(sk)-1; i>=0; i--)
 441                 {
 442                 vv=(CONF_VALUE *)sk_value(sk,i);
 443                 Free(vv->value);
 444                 Free(vv->name);
 445                 Free(vv);
 446                 }
 447         if (sk != NULL) sk_free(sk);
 448         Free(a->section);
 449         Free(a);
 450         }
 451
 452 static void clear_comments(char *p)
 453         {
 454         char *to;
 455
 456         to=p;
 457         for (;;)
 458                 {
 459                 if (IS_COMMENT(*p))
 460                         {
 461                         *p='\0';
 462                         return;
 463                         }
 464                 if (IS_QUOTE(*p))
 465                         {
 466                         p=scan_quote(p);
 467                         continue;
 468                         }
 469                 if (IS_ESC(*p))
 470                         {
 471                         p=scan_esc(p);
 472                         continue;
 473                         }
 474                 if (IS_EOF(*p))
 475                         return;
 476                 else
 477                         p++;
 478                 }
 479         }
 480
 481 static int str_copy(LHASH *conf, char *section, char **pto, char *from)
 482         {
 483         int q,r,rr=0,to=0,len=0;
 484         char *s,*e,*rp,*p,*rrp,*np,*cp,v;
 485         BUF_MEM *buf;
 486
 487         if ((buf=BUF_MEM_new()) == NULL) return(0);
 488
 489         len=strlen(from)+1;
 490         if (!BUF_MEM_grow(buf,len)) goto err;
 491
 492         for (;;)
 493                 {
 494                 if (IS_QUOTE(*from))
 495                         {
 496                         q= *from;
 497                         from++;
 498                         while ((*from != '\0') && (*from != q))
 499                                 {
 500                                 if (*from == '\\')
 501                                         {
 502                                         from++;
 503                                         if (*from == '\0') break;
 504                                         }
 505                                 buf->data[to++]= *(from++);
 506                                 }
 507                         }
 508                 else if (*from == '\\')
 509                         {
 510                         from++;
 511                         v= *(from++);
 512                         if (v == '\0') break;
 513                         else if (v == 'r') v='\r';
 514                         else if (v == 'n') v='\n';
 515                         else if (v == 'b') v='\b';
 516                         else if (v == 't') v='\t';
 517                         buf->data[to++]= v;
 518                         }
 519                 else if (*from == '\0')
 520                         break;
 521                 else if (*from == '$')
 522                         {
 523                         /* try to expand it */
 524                         rrp=NULL;
 525                         s= &(from[1]);
 526                         if (*s == '{')
 527                                 q='}';
 528                         else if (*s == '(')
 529                                 q=')';
 530                         else q=0;
 531
 532                         if (q) s++;
 533                         cp=section;
 534                         e=np=s;
 535                         while (IS_ALPHA_NUMERIC(*e))
 536                                 e++;
 537                         if ((e[0] == ':') && (e[1] == ':'))
 538                                 {
 539                                 cp=np;
 540                                 rrp=e;
 541                                 rr= *e;
 542                                 *rrp='\0';
 543                                 e+=2;
 544                                 np=e;
 545                                 while (IS_ALPHA_NUMERIC(*e))
 546                                         e++;
 547                                 }
 548                         r= *e;
 549                         *e='\0';
 550                         rp=e;
 551                         if (q)
 552                                 {
 553                                 if (r != q)
 554                                         {
 555                                         CONFerr(CONF_F_STR_COPY,CONF_R_NO_CLOSE_BRACE);
 556                                         goto err;
 557                                         }
 558                                 e++;
 559                                 }
 560                         /* So at this point we have
 561                          * ns which is the start of the name string which is
 562                          *   '\0' terminated.
 563                          * cs which is the start of the section string which is
 564                          *   '\0' terminated.
 565                          * e is the 'next point after'.
 566                          * r and s are the chars replaced by the '\0'
 567                          * rp and sp is where 'r' and 's' came from.
 568                          */
 569                         p=CONF_get_string(conf,cp,np);
 570                         if (rrp != NULL) *rrp=rr;
 571                         *rp=r;
 572                         if (p == NULL)
 573                                 {
 574                                 CONFerr(CONF_F_STR_COPY,CONF_R_VARIABLE_HAS_NO_VALUE);
 575                                 goto err;
 576                                 }
 577                         BUF_MEM_grow(buf,(strlen(p)+len-(e-from)));
 578                         while (*p)
 579                                 buf->data[to++]= *(p++);
 580                         from=e;
 581                         }
 582                 else
 583                         buf->data[to++]= *(from++);
 584                 }
 585         buf->data[to]='\0';
 586         if (*pto != NULL) Free(*pto);
 587         *pto=buf->data;
 588         Free(buf);
 589         return(1);
 590 err:
 591         if (buf != NULL) BUF_MEM_free(buf);
 592         return(0);
 593         }
 594
 595 static char *eat_ws(char *p)
 596         {
 597         while (IS_WS(*p) && (!IS_EOF(*p)))
 598                 p++;
 599         return(p);
 600         }
 601
 602 static char *eat_alpha_numeric(char *p)
 603         {
 604         for (;;)
 605                 {
 606                 if (IS_ESC(*p))
 607                         {
 608                         p=scan_esc(p);
 609                         continue;
 610                         }
 611                 if (!IS_ALPHA_NUMERIC_PUNCT(*p))
 612                         return(p);
 613                 p++;
 614                 }
 615         }
 616
 617 static unsigned long hash(CONF_VALUE *v)
 618         {
 619         return((lh_strhash(v->section)<<2)^lh_strhash(v->name));
 620         }
 621
 622 static int cmp(CONF_VALUE *a, CONF_VALUE *b)
 623         {
 624         int i;
 625
 626         if (a->section != b->section)
 627                 {
 628                 i=strcmp(a->section,b->section);
 629                 if (i) return(i);
 630                 }
 631
 632         if ((a->name != NULL) && (b->name != NULL))
 633                 {
 634                 i=strcmp(a->name,b->name);
 635                 return(i);
 636                 }
 637         else if (a->name == b->name)
 638                 return(0);
 639         else
 640                 return((a->name == NULL)?-1:1);
 641         }
 642
 643 static char *scan_quote(char *p)
 644         {
 645         int q= *p;
 646
 647         p++;
 648         while (!(IS_EOF(*p)) && (*p != q))
 649                 {
 650                 if (IS_ESC(*p))
 651                         {
 652                         p++;
 653                         if (IS_EOF(*p)) return(p);
 654                         }
 655                 p++;
 656                 }
 657         if (*p == q) p++;
 658         return(p);
 659         }
 660
 661 static CONF_VALUE *new_section(LHASH *conf, char *section)
 662         {
 663         STACK *sk=NULL;
 664         int ok=0,i;
 665         CONF_VALUE *v=NULL,*vv;
 666
 667         if ((sk=sk_new_null()) == NULL)
 668                 goto err;
 669         if ((v=(CONF_VALUE *)Malloc(sizeof(CONF_VALUE))) == NULL)
 670                 goto err;
 671         i=strlen(section)+1;
 672         if ((v->section=(char *)Malloc(i)) == NULL)
 673                 goto err;
 674
 675         memcpy(v->section,section,i);
 676         v->name=NULL;
 677         v->value=(char *)sk;
 678
 679         vv=(CONF_VALUE *)lh_insert(conf,(char *)v);
 680         if (vv != NULL)
 681                 {
 682 #if !defined(NO_STDIO) && !defined(WIN16)
 683                 fprintf(stderr,"internal fault\n");
 684 #endif
 685                 abort();
 686                 }
 687         ok=1;
 688 err:
 689         if (!ok)
 690                 {
 691                 if (sk != NULL) sk_free(sk);
 692                 if (v != NULL) Free(v);
 693                 v=NULL;
 694                 }
 695         return(v);
 696         }