crypto/txt_db/txt_db.c

   1 /*
   2  * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include "internal/cryptlib.h"
  14 #include <openssl/buffer.h>
  15 #include <openssl/txt_db.h>
  16
  17 #undef BUFSIZE
  18 #define BUFSIZE 512
  19
  20 TXT_DB *TXT_DB_read(BIO *in, int num)
  21 {
  22     TXT_DB *ret = NULL;
  23     int esc = 0;
  24     int i, add, n;
  25     int size = BUFSIZE;
  26     int offset = 0;
  27     char *p, *f;
  28     OPENSSL_STRING *pp;
  29     BUF_MEM *buf = NULL;
  30
  31     if ((buf = BUF_MEM_new()) == NULL)
  32         goto err;
  33     if (!BUF_MEM_grow(buf, size))
  34         goto err;
  35
  36     if ((ret = OPENSSL_malloc(sizeof(*ret))) == NULL)
  37         goto err;
  38     ret->num_fields = num;
  39     ret->index = NULL;
  40     ret->qual = NULL;
  41     if ((ret->data = sk_OPENSSL_PSTRING_new_null()) == NULL)
  42         goto err;
  43     if ((ret->index = OPENSSL_malloc(sizeof(*ret->index) * num)) == NULL)
  44         goto err;
  45     if ((ret->qual = OPENSSL_malloc(sizeof(*(ret->qual)) * num)) == NULL)
  46         goto err;
  47     for (i = 0; i < num; i++) {
  48         ret->index[i] = NULL;
  49         ret->qual[i] = NULL;
  50     }
  51
  52     add = (num + 1) * sizeof(char *);
  53     buf->data[size - 1] = '\0';
  54     offset = 0;
  55     for (;;) {
  56         if (offset != 0) {
  57             size += BUFSIZE;
  58             if (!BUF_MEM_grow_clean(buf, size))
  59                 goto err;
  60         }
  61         buf->data[offset] = '\0';
  62         BIO_gets(in, &(buf->data[offset]), size - offset);
  63         if (buf->data[offset] == '\0')
  64             break;
  65         if ((offset == 0) && (buf->data[0] == '#'))
  66             continue;
  67         i = strlen(&(buf->data[offset]));
  68         offset += i;
  69         if (buf->data[offset - 1] != '\n')
  70             continue;
  71         else {
  72             buf->data[offset - 1] = '\0'; /* blat the '\n' */
  73             if ((p = OPENSSL_malloc(add + offset)) == NULL)
  74                 goto err;
  75             offset = 0;
  76         }
  77         pp = (char **)p;
  78         p += add;
  79         n = 0;
  80         pp[n++] = p;
  81         f = buf->data;
  82
  83         esc = 0;
  84         for (;;) {
  85             if (*f == '\0')
  86                 break;
  87             if (*f == '\t') {
  88                 if (esc)
  89                     p--;
  90                 else {
  91                     *(p++) = '\0';
  92                     f++;
  93                     if (n >= num)
  94                         break;
  95                     pp[n++] = p;
  96                     continue;
  97                 }
  98             }
  99             esc = (*f == '\\');
 100             *(p++) = *(f++);
 101         }
 102         *(p++) = '\0';
 103         if ((n != num) || (*f != '\0')) {
 104             OPENSSL_free(pp);
 105             ret->error = DB_ERROR_WRONG_NUM_FIELDS;
 106             goto err;
 107         }
 108         pp[n] = p;
 109         if (!sk_OPENSSL_PSTRING_push(ret->data, pp)) {
 110             OPENSSL_free(pp);
 111             goto err;
 112         }
 113     }
 114     BUF_MEM_free(buf);
 115     return ret;
 116  err:
 117     BUF_MEM_free(buf);
 118     if (ret != NULL) {
 119         sk_OPENSSL_PSTRING_free(ret->data);
 120         OPENSSL_free(ret->index);
 121         OPENSSL_free(ret->qual);
 122         OPENSSL_free(ret);
 123     }
 124     return NULL;
 125 }
 126
 127 OPENSSL_STRING *TXT_DB_get_by_index(TXT_DB *db, int idx,
 128                                     OPENSSL_STRING *value)
 129 {
 130     OPENSSL_STRING *ret;
 131     LHASH_OF(OPENSSL_STRING) *lh;
 132
 133     if (idx >= db->num_fields) {
 134         db->error = DB_ERROR_INDEX_OUT_OF_RANGE;
 135         return NULL;
 136     }
 137     lh = db->index[idx];
 138     if (lh == NULL) {
 139         db->error = DB_ERROR_NO_INDEX;
 140         return NULL;
 141     }
 142     ret = lh_OPENSSL_STRING_retrieve(lh, value);
 143     db->error = DB_ERROR_OK;
 144     return ret;
 145 }
 146
 147 int TXT_DB_create_index(TXT_DB *db, int field, int (*qual) (OPENSSL_STRING *),
 148                         OPENSSL_LH_HASHFUNC hash, OPENSSL_LH_COMPFUNC cmp)
 149 {
 150     LHASH_OF(OPENSSL_STRING) *idx;
 151     OPENSSL_STRING *r, *k;
 152     int i, n;
 153
 154     if (field >= db->num_fields) {
 155         db->error = DB_ERROR_INDEX_OUT_OF_RANGE;
 156         return 0;
 157     }
 158     /* FIXME: we lose type checking at this point */
 159     if ((idx = (LHASH_OF(OPENSSL_STRING) *)OPENSSL_LH_new(hash, cmp)) == NULL) {
 160         db->error = DB_ERROR_MALLOC;
 161         return 0;
 162     }
 163     n = sk_OPENSSL_PSTRING_num(db->data);
 164     for (i = 0; i < n; i++) {
 165         r = sk_OPENSSL_PSTRING_value(db->data, i);
 166         if ((qual != NULL) && (qual(r) == 0))
 167             continue;
 168         if ((k = lh_OPENSSL_STRING_insert(idx, r)) != NULL) {
 169             db->error = DB_ERROR_INDEX_CLASH;
 170             db->arg1 = sk_OPENSSL_PSTRING_find(db->data, k);
 171             db->arg2 = i;
 172             lh_OPENSSL_STRING_free(idx);
 173             return 0;
 174         }
 175         if (lh_OPENSSL_STRING_retrieve(idx, r) == NULL) {
 176             db->error = DB_ERROR_MALLOC;
 177             lh_OPENSSL_STRING_free(idx);
 178             return 0;
 179         }
 180     }
 181     lh_OPENSSL_STRING_free(db->index[field]);
 182     db->index[field] = idx;
 183     db->qual[field] = qual;
 184     return 1;
 185 }
 186
 187 long TXT_DB_write(BIO *out, TXT_DB *db)
 188 {
 189     long i, j, n, nn, l, tot = 0;
 190     char *p, **pp, *f;
 191     BUF_MEM *buf = NULL;
 192     long ret = -1;
 193
 194     if ((buf = BUF_MEM_new()) == NULL)
 195         goto err;
 196     n = sk_OPENSSL_PSTRING_num(db->data);
 197     nn = db->num_fields;
 198     for (i = 0; i < n; i++) {
 199         pp = sk_OPENSSL_PSTRING_value(db->data, i);
 200
 201         l = 0;
 202         for (j = 0; j < nn; j++) {
 203             if (pp[j] != NULL)
 204                 l += strlen(pp[j]);
 205         }
 206         if (!BUF_MEM_grow_clean(buf, (int)(l * 2 + nn)))
 207             goto err;
 208
 209         p = buf->data;
 210         for (j = 0; j < nn; j++) {
 211             f = pp[j];
 212             if (f != NULL)
 213                 for (;;) {
 214                     if (*f == '\0')
 215                         break;
 216                     if (*f == '\t')
 217                         *(p++) = '\\';
 218                     *(p++) = *(f++);
 219                 }
 220             *(p++) = '\t';
 221         }
 222         p[-1] = '\n';
 223         j = p - buf->data;
 224         if (BIO_write(out, buf->data, (int)j) != j)
 225             goto err;
 226         tot += j;
 227     }
 228     ret = tot;
 229  err:
 230     BUF_MEM_free(buf);
 231     return ret;
 232 }
 233
 234 int TXT_DB_insert(TXT_DB *db, OPENSSL_STRING *row)
 235 {
 236     int i;
 237     OPENSSL_STRING *r;
 238
 239     for (i = 0; i < db->num_fields; i++) {
 240         if (db->index[i] != NULL) {
 241             if ((db->qual[i] != NULL) && (db->qual[i] (row) == 0))
 242                 continue;
 243             r = lh_OPENSSL_STRING_retrieve(db->index[i], row);
 244             if (r != NULL) {
 245                 db->error = DB_ERROR_INDEX_CLASH;
 246                 db->arg1 = i;
 247                 db->arg_row = r;
 248                 goto err;
 249             }
 250         }
 251     }
 252
 253     for (i = 0; i < db->num_fields; i++) {
 254         if (db->index[i] != NULL) {
 255             if ((db->qual[i] != NULL) && (db->qual[i] (row) == 0))
 256                 continue;
 257             (void)lh_OPENSSL_STRING_insert(db->index[i], row);
 258             if (lh_OPENSSL_STRING_retrieve(db->index[i], row) == NULL)
 259                 goto err1;
 260         }
 261     }
 262     if (!sk_OPENSSL_PSTRING_push(db->data, row))
 263         goto err1;
 264     return 1;
 265
 266  err1:
 267     db->error = DB_ERROR_MALLOC;
 268     while (i-- > 0) {
 269         if (db->index[i] != NULL) {
 270             if ((db->qual[i] != NULL) && (db->qual[i] (row) == 0))
 271                 continue;
 272             (void)lh_OPENSSL_STRING_delete(db->index[i], row);
 273         }
 274     }
 275  err:
 276     return 0;
 277 }
 278
 279 void TXT_DB_free(TXT_DB *db)
 280 {
 281     int i, n;
 282     char **p, *max;
 283
 284     if (db == NULL)
 285         return;
 286     if (db->index != NULL) {
 287         for (i = db->num_fields - 1; i >= 0; i--)
 288             lh_OPENSSL_STRING_free(db->index[i]);
 289         OPENSSL_free(db->index);
 290     }
 291     OPENSSL_free(db->qual);
 292     if (db->data != NULL) {
 293         for (i = sk_OPENSSL_PSTRING_num(db->data) - 1; i >= 0; i--) {
 294             /*
 295              * check if any 'fields' have been allocated from outside of the
 296              * initial block
 297              */
 298             p = sk_OPENSSL_PSTRING_value(db->data, i);
 299             max = p[db->num_fields]; /* last address */
 300             if (max == NULL) {  /* new row */
 301                 for (n = 0; n < db->num_fields; n++)
 302                     OPENSSL_free(p[n]);
 303             } else {
 304                 for (n = 0; n < db->num_fields; n++) {
 305                     if (((p[n] < (char *)p) || (p[n] > max)))
 306                         OPENSSL_free(p[n]);
 307                 }
 308             }
 309             OPENSSL_free(sk_OPENSSL_PSTRING_value(db->data, i));
 310         }
 311         sk_OPENSSL_PSTRING_free(db->data);
 312     }
 313     OPENSSL_free(db);
 314 }