/src/unbound/validator/val_anchor.c

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/*
 * validator/val_anchor.c - validator trust anchor storage.
 *
 * Copyright (c) 2007, NLnet Labs. All rights reserved.
 *
 * This software is open source.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * Neither the name of the NLNET LABS nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * \file
 *
 * This file contains storage for the trust anchors for the validator.
 */
#include "config.h"
#include <ctype.h>
#include "validator/val_anchor.h"
#include "validator/val_sigcrypt.h"
#include "validator/autotrust.h"
#include "util/data/packed_rrset.h"
#include "util/data/dname.h"
#include "util/log.h"
#include "util/net_help.h"
#include "util/config_file.h"
#include "util/as112.h"
#include "sldns/sbuffer.h"
#include "sldns/rrdef.h"
#include "sldns/str2wire.h"
#ifdef HAVE_GLOB_H
#include <glob.h>
#endif

int
anchor_cmp(const void* k1, const void* k2)
{
  int m;
  struct trust_anchor* n1 = (struct trust_anchor*)k1;
  struct trust_anchor* n2 = (struct trust_anchor*)k2;
  /* no need to ntohs(class) because sort order is irrelevant */
  if(n1->dclass != n2->dclass) {
    if(n1->dclass < n2->dclass)
      return -1;
    return 1;
  }
  return dname_lab_cmp(n1->name, n1->namelabs, n2->name, n2->namelabs, 
    &m);
}

struct val_anchors* 
anchors_create(void)
{
  struct val_anchors* a = (struct val_anchors*)calloc(1, sizeof(*a));
  if(!a)
    return NULL;
  a->tree = rbtree_create(anchor_cmp);
  if(!a->tree) {
    anchors_delete(a);
    return NULL;
  }
  a->autr = autr_global_create();
  if(!a->autr) {
    anchors_delete(a);
    return NULL;
  }
  lock_basic_init(&a->lock);
  lock_protect(&a->lock, a, sizeof(*a));
  lock_protect(&a->lock, a->autr, sizeof(*a->autr));
  return a;
}

/** delete assembled rrset */
static void
assembled_rrset_delete(struct ub_packed_rrset_key* pkey)
{
  if(!pkey) return;
  if(pkey->entry.data) {
    struct packed_rrset_data* pd = (struct packed_rrset_data*)
      pkey->entry.data;
    free(pd->rr_data);
    free(pd->rr_ttl);
    free(pd->rr_len);
    free(pd);
  }
  free(pkey->rk.dname);
  free(pkey);
}

/** destroy locks in tree and delete autotrust anchors */
static void
anchors_delfunc(rbnode_type* elem, void* ATTR_UNUSED(arg))
{
  struct trust_anchor* ta = (struct trust_anchor*)elem;
  if(!ta) return;
  if(ta->autr) {
    autr_point_delete(ta);
  } else {
    struct ta_key* p, *np;
    lock_basic_destroy(&ta->lock);
    free(ta->name);
    p = ta->keylist;
    while(p) {
      np = p->next;
      free(p->data);
      free(p);
      p = np;
    }
    assembled_rrset_delete(ta->ds_rrset);
    assembled_rrset_delete(ta->dnskey_rrset);
    free(ta);
  }
}

void 
anchors_delete(struct val_anchors* anchors)
{
  if(!anchors)
    return;
  lock_unprotect(&anchors->lock, anchors->autr);
  lock_unprotect(&anchors->lock, anchors);
  lock_basic_destroy(&anchors->lock);
  if(anchors->tree)
    traverse_postorder(anchors->tree, anchors_delfunc, NULL);
  free(anchors->tree);
  autr_global_delete(anchors->autr);
  free(anchors);
}

void
anchors_init_parents_locked(struct val_anchors* anchors)
{
  struct trust_anchor* node, *prev = NULL, *p;
  int m; 
  /* nobody else can grab locks because we hold the main lock.
   * Thus the previous items, after unlocked, are not deleted */
  RBTREE_FOR(node, struct trust_anchor*, anchors->tree) {
    lock_basic_lock(&node->lock);
    node->parent = NULL;
    if(!prev || prev->dclass != node->dclass) {
      prev = node;
      lock_basic_unlock(&node->lock);
      continue;
    }
    (void)dname_lab_cmp(prev->name, prev->namelabs, node->name, 
      node->namelabs, &m); /* we know prev is smaller */
    /* sort order like: . com. bla.com. zwb.com. net. */
    /* find the previous, or parent-parent-parent */
    for(p = prev; p; p = p->parent)
      /* looking for name with few labels, a parent */
      if(p->namelabs <= m) {
        /* ==: since prev matched m, this is closest*/
        /* <: prev matches more, but is not a parent,
        * this one is a (grand)parent */
        node->parent = p;
        break;
      }
    lock_basic_unlock(&node->lock);
    prev = node;
  }
}

/** initialise parent pointers in the tree */
static void
init_parents(struct val_anchors* anchors)
{
  lock_basic_lock(&anchors->lock);
  anchors_init_parents_locked(anchors);
  lock_basic_unlock(&anchors->lock);
}

struct trust_anchor*
anchor_find(struct val_anchors* anchors, uint8_t* name, int namelabs,
  size_t namelen, uint16_t dclass)
{
  struct trust_anchor key;
  rbnode_type* n;
  if(!name) return NULL;
  key.node.key = &key;
  key.name = name;
  key.namelabs = namelabs;
  key.namelen = namelen;
  key.dclass = dclass;
  lock_basic_lock(&anchors->lock);
  n = rbtree_search(anchors->tree, &key);
  if(n) {
    lock_basic_lock(&((struct trust_anchor*)n->key)->lock);
  }
  lock_basic_unlock(&anchors->lock);
  if(!n)
    return NULL;
  return (struct trust_anchor*)n->key;
}

/** create new trust anchor object */
static struct trust_anchor*
anchor_new_ta(struct val_anchors* anchors, uint8_t* name, int namelabs,
  size_t namelen, uint16_t dclass, int lockit)
{
#ifdef UNBOUND_DEBUG
  rbnode_type* r;
#endif
  struct trust_anchor* ta = (struct trust_anchor*)malloc(
    sizeof(struct trust_anchor));
  if(!ta)
    return NULL;
  memset(ta, 0, sizeof(*ta));
  ta->node.key = ta;
  ta->name = memdup(name, namelen);
  if(!ta->name) {
    free(ta);
    return NULL;
  }
  ta->namelabs = namelabs;
  ta->namelen = namelen;
  ta->dclass = dclass;
  lock_basic_init(&ta->lock);
  if(lockit) {
    lock_basic_lock(&anchors->lock);
  }
#ifdef UNBOUND_DEBUG
  r =
#else
  (void)
#endif
  rbtree_insert(anchors->tree, &ta->node);
  if(lockit) {
    lock_basic_unlock(&anchors->lock);
  }
  log_assert(r != NULL);
  return ta;
}

/** find trustanchor key by exact data match */
static struct ta_key*
anchor_find_key(struct trust_anchor* ta, uint8_t* rdata, size_t rdata_len,
  uint16_t type)
{
  struct ta_key* k;
  for(k = ta->keylist; k; k = k->next) {
    if(k->type == type && k->len == rdata_len &&
      memcmp(k->data, rdata, rdata_len) == 0)
      return k;
  }
  return NULL;
}
  
/** create new trustanchor key */
static struct ta_key*
anchor_new_ta_key(uint8_t* rdata, size_t rdata_len, uint16_t type)
{
  struct ta_key* k = (struct ta_key*)malloc(sizeof(*k));
  if(!k)
    return NULL;
  memset(k, 0, sizeof(*k));
  k->data = memdup(rdata, rdata_len);
  if(!k->data) {
    free(k);
    return NULL;
  }
  k->len = rdata_len;
  k->type = type;
  return k;
}

/**
 * This routine adds a new RR to a trust anchor. The trust anchor may not
 * exist yet, and is created if not. The RR can be DS or DNSKEY.
 * This routine will also remove duplicates; storing them only once.
 * @param anchors: anchor storage.
 * @param name: name of trust anchor (wireformat)
 * @param type: type or RR
 * @param dclass: class of RR
 * @param rdata: rdata wireformat, starting with rdlength.
 *  If NULL, nothing is stored, but an entry is created.
 * @param rdata_len: length of rdata including rdlength.
 * @return: NULL on error, else the trust anchor.
 */
static struct trust_anchor*
anchor_store_new_key(struct val_anchors* anchors, uint8_t* name, uint16_t type,
  uint16_t dclass, uint8_t* rdata, size_t rdata_len)
{
  struct ta_key* k;
  struct trust_anchor* ta;
  int namelabs;
  size_t namelen;
  namelabs = dname_count_size_labels(name, &namelen);
  if(type != LDNS_RR_TYPE_DS && type != LDNS_RR_TYPE_DNSKEY) {
    log_err("Bad type for trust anchor");
    return 0;
  }
  /* lookup or create trustanchor */
  ta = anchor_find(anchors, name, namelabs, namelen, dclass);
  if(!ta) {
    ta = anchor_new_ta(anchors, name, namelabs, namelen, dclass, 1);
    if(!ta)
      return NULL;
    lock_basic_lock(&ta->lock);
  }
  if(!rdata) {
    lock_basic_unlock(&ta->lock);
    return ta;
  }
  /* look for duplicates */
  if(anchor_find_key(ta, rdata, rdata_len, type)) {
    lock_basic_unlock(&ta->lock);
    return ta;
  }
  k = anchor_new_ta_key(rdata, rdata_len, type);
  if(!k) {
    lock_basic_unlock(&ta->lock);
    return NULL;
  }
  /* add new key */
  if(type == LDNS_RR_TYPE_DS)
    ta->numDS++;
  else  ta->numDNSKEY++;
  k->next = ta->keylist;
  ta->keylist = k;
  lock_basic_unlock(&ta->lock);
  return ta;
}

/**
 * Add new RR. It converts ldns RR to wire format.
 * @param anchors: anchor storage.
 * @param rr: the wirerr.
 * @param rl: length of rr.
 * @param dl: length of dname.
 * @return NULL on error, else the trust anchor.
 */
static struct trust_anchor*
anchor_store_new_rr(struct val_anchors* anchors, uint8_t* rr, size_t rl,
  size_t dl)
{
  struct trust_anchor* ta;
  if(!(ta=anchor_store_new_key(anchors, rr,
    sldns_wirerr_get_type(rr, rl, dl),
    sldns_wirerr_get_class(rr, rl, dl),
    sldns_wirerr_get_rdatawl(rr, rl, dl),
    sldns_wirerr_get_rdatalen(rr, rl, dl)+2))) {
    return NULL;
  }
  log_nametypeclass(VERB_QUERY, "adding trusted key",
    rr, sldns_wirerr_get_type(rr, rl, dl),
    sldns_wirerr_get_class(rr, rl, dl));
  return ta;
}

/**
 * Insert insecure anchor
 * @param anchors: anchor storage.
 * @param str: the domain name.
 * @return NULL on error, Else last trust anchor point
 */
static struct trust_anchor*
anchor_insert_insecure(struct val_anchors* anchors, const char* str)
{
  struct trust_anchor* ta;
  size_t dname_len = 0;
  uint8_t* nm = sldns_str2wire_dname(str, &dname_len);
  if(!nm) {
    log_err("parse error in domain name '%s'", str);
    return NULL;
  }
  ta = anchor_store_new_key(anchors, nm, LDNS_RR_TYPE_DS,
    LDNS_RR_CLASS_IN, NULL, 0);
  free(nm);
  return ta;
}

struct trust_anchor*
anchor_store_str(struct val_anchors* anchors, sldns_buffer* buffer,
  const char* str)
{
  struct trust_anchor* ta;
  uint8_t* rr = sldns_buffer_begin(buffer);
  size_t len = sldns_buffer_capacity(buffer), dname_len = 0;
  int status = sldns_str2wire_rr_buf(str, rr, &len, &dname_len,
    0, NULL, 0, NULL, 0);
  if(status != 0) {
    log_err("error parsing trust anchor %s: at %d: %s", 
      str, LDNS_WIREPARSE_OFFSET(status),
      sldns_get_errorstr_parse(status));
    return NULL;
  }
  if(!(ta=anchor_store_new_rr(anchors, rr, len, dname_len))) {
    log_err("out of memory");
    return NULL;
  }
  return ta;
}

/**
 * Read a file with trust anchors
 * @param anchors: anchor storage.
 * @param buffer: parsing buffer.
 * @param fname: string.
 * @param onlyone: only one trust anchor allowed in file.
 * @return NULL on error. Else last trust-anchor point.
 */
static struct trust_anchor*
anchor_read_file(struct val_anchors* anchors, sldns_buffer* buffer,
  const char* fname, int onlyone)
{
  struct trust_anchor* ta = NULL, *tanew;
  struct sldns_file_parse_state pst;
  int status;
  size_t len, dname_len;
  uint8_t* rr = sldns_buffer_begin(buffer);
  int ok = 1;
  FILE* in = fopen(fname, "r");
  if(!in) {
    log_err("error opening file %s: %s", fname, strerror(errno));
    return 0;
  }
  memset(&pst, 0, sizeof(pst));
  pst.default_ttl = 3600;
  pst.lineno = 1;
  while(!feof(in)) {
    len = sldns_buffer_capacity(buffer);
    dname_len = 0;
    status = sldns_fp2wire_rr_buf(in, rr, &len, &dname_len, &pst);
    if(len == 0) /* empty, $TTL, $ORIGIN */
      continue;
    if(status != 0) {
      log_err("parse error in %s:%d:%d : %s", fname,
        pst.lineno, LDNS_WIREPARSE_OFFSET(status),
        sldns_get_errorstr_parse(status));
      ok = 0;
      break;
    }
    if(sldns_wirerr_get_type(rr, len, dname_len) !=
      LDNS_RR_TYPE_DS && sldns_wirerr_get_type(rr, len,
      dname_len) != LDNS_RR_TYPE_DNSKEY) {
      continue;
    }
    if(!(tanew=anchor_store_new_rr(anchors, rr, len, dname_len))) {
      log_err("mem error at %s line %d", fname, pst.lineno);
      ok = 0;
      break;
    }
    if(onlyone && ta && ta != tanew) {
      log_err("error at %s line %d: no multiple anchor "
        "domains allowed (you can have multiple "
        "keys, but they must have the same name).", 
        fname, pst.lineno);
      ok = 0;
      break;
    }
    ta = tanew;
  }
  fclose(in);
  if(!ok) return NULL;
  /* empty file is OK when multiple anchors are allowed */
  if(!onlyone && !ta) return (struct trust_anchor*)1;
  return ta;
}

/** skip file to end of line */
static void
skip_to_eol(FILE* in)
{
  int c;
  while((c = getc(in)) != EOF ) {
    if(c == '\n')
      return;
  }
}

/** true for special characters in bind configs */
static int
is_bind_special(int c)
{
  switch(c) {
    case '{':
    case '}':
    case '"':
    case ';':
      return 1;
  }
  return 0;
}

/** 
 * Read a keyword skipping bind comments; spaces, specials, restkeywords. 
 * The file is split into the following tokens:
 *  * special characters, on their own, rdlen=1, { } doublequote ;
 *  * whitespace becomes a single ' ' or tab. Newlines become spaces.
 *  * other words ('keywords')
 *  * comments are skipped if desired
 *    / / C++ style comment to end of line
 *    # to end of line
 *    / * C style comment * /
 * @param in: file to read from.
 * @param buf: buffer, what is read is stored after current buffer position.
 *  Space is left in the buffer to write a terminating 0.
 * @param line: line number is increased per line, for error reports.
 * @param comments: if 0, comments are not possible and become text.
 *  if 1, comments are skipped entirely.
 *  In BIND files, this is when reading quoted strings, for example
 *  " base 64 text with / / in there "
 * @return the number of character written to the buffer. 
 *  0 on end of file.
 */
static int
readkeyword_bindfile(FILE* in, sldns_buffer* buf, int* line, int comments)
{
  int c;
  int numdone = 0;
  while((c = getc(in)) != EOF ) {
    if(comments && c == '#') { /*   # blabla   */
      skip_to_eol(in);
      (*line)++;
      continue;
    } else if(comments && c=='/' && numdone>0 && /* /_/ bla*/
      sldns_buffer_read_u8_at(buf, 
      sldns_buffer_position(buf)-1) == '/') {
      sldns_buffer_skip(buf, -1);
      numdone--;
      skip_to_eol(in);
      (*line)++;
      continue;
    } else if(comments && c=='*' && numdone>0 && /* /_* bla *_/ */
      sldns_buffer_read_u8_at(buf, 
      sldns_buffer_position(buf)-1) == '/') {
      sldns_buffer_skip(buf, -1);
      numdone--;
      /* skip to end of comment */
      while(c != EOF && (c=getc(in)) != EOF ) {
        if(c == '*') {
          if((c=getc(in)) == '/')
            break;
        }
        if(c == '\n')
          (*line)++;
      }
      continue;
    }
    /* not a comment, complete the keyword */
    if(numdone > 0) {
      /* check same type */
      if(isspace((unsigned char)c)) {
        ungetc(c, in);
        return numdone;
      }
      if(is_bind_special(c)) {
        ungetc(c, in);
        return numdone;
      }
    }
    if(c == '\n') {
      c = ' ';
      (*line)++;
    }
    /* space for 1 char + 0 string terminator */
    if(sldns_buffer_remaining(buf) < 2) {
      fatal_exit("trusted-keys, %d, string too long", *line);
    }
    sldns_buffer_write_u8(buf, (uint8_t)c);
    numdone++;
    if(isspace((unsigned char)c)) {
      /* collate whitespace into ' ' */
      while((c = getc(in)) != EOF ) {
        if(c == '\n')
          (*line)++;
        if(!isspace((unsigned char)c)) {
          ungetc(c, in);
          break;
        }
      }
      return numdone;
    }
    if(is_bind_special(c))
      return numdone;
  }
  return numdone;
}

/** skip through file to { or ; */
static int 
skip_to_special(FILE* in, sldns_buffer* buf, int* line, int spec) 
{
  int rdlen;
  sldns_buffer_clear(buf);
  while((rdlen=readkeyword_bindfile(in, buf, line, 1))) {
    if(rdlen == 1 && isspace((unsigned char)*sldns_buffer_begin(buf))) {
      sldns_buffer_clear(buf);
      continue;
    }
    if(rdlen != 1 || *sldns_buffer_begin(buf) != (uint8_t)spec) {
      sldns_buffer_write_u8(buf, 0);
      log_err("trusted-keys, line %d, expected %c", 
        *line, spec);
      return 0;
    }
    return 1;
  }
  log_err("trusted-keys, line %d, expected %c got EOF", *line, spec);
  return 0;
}

/** 
 * read contents of trusted-keys{ ... ; clauses and insert keys into storage.
 * @param anchors: where to store keys
 * @param buf: buffer to use
 * @param line: line number in file
 * @param in: file to read from.
 * @return 0 on error.
 */
static int
process_bind_contents(struct val_anchors* anchors, sldns_buffer* buf, 
  int* line, FILE* in)
{
  /* loop over contents, collate strings before ; */
  /* contents is (numbered): 0   1    2  3 4   5  6 7 8    */
  /*                           name. 257 3 5 base64 base64 */
  /* quoted value:           0 "111"  0  0 0   0  0 0 0    */
  /* comments value:         1 "000"  1  1  1 "0  0 0 0"  1 */
  int contnum = 0;
  int quoted = 0;
  int comments = 1;
  int rdlen;
  char* str = 0;
  sldns_buffer_clear(buf);
  while((rdlen=readkeyword_bindfile(in, buf, line, comments))) {
    if(rdlen == 1 && sldns_buffer_position(buf) == 1
      && isspace((unsigned char)*sldns_buffer_begin(buf))) {
      /* starting whitespace is removed */
      sldns_buffer_clear(buf);
      continue;
    } else if(rdlen == 1 && sldns_buffer_current(buf)[-1] == '"') {
      /* remove " from the string */
      if(contnum == 0) {
        quoted = 1;
        comments = 0;
      }
      sldns_buffer_skip(buf, -1);
      if(contnum > 0 && quoted) {
        if(sldns_buffer_remaining(buf) < 8+1) {
          log_err("line %d, too long", *line);
          return 0;
        }
        sldns_buffer_write(buf, " DNSKEY ", 8);
        quoted = 0;
        comments = 1;
      } else if(contnum > 0)
        comments = !comments;
      continue;
    } else if(rdlen == 1 && sldns_buffer_current(buf)[-1] == ';') {

      if(contnum < 5) {
        sldns_buffer_write_u8(buf, 0);
        log_err("line %d, bad key", *line);
        return 0;
      }
      sldns_buffer_skip(buf, -1);
      sldns_buffer_write_u8(buf, 0);
      str = strdup((char*)sldns_buffer_begin(buf));
      if(!str) {
        log_err("line %d, allocation failure", *line);
        return 0;
      }
      if(!anchor_store_str(anchors, buf, str)) {
        log_err("line %d, bad key", *line);
        free(str);
        return 0;
      }
      free(str);
      sldns_buffer_clear(buf);
      contnum = 0;
      quoted = 0;
      comments = 1;
      continue;
    } else if(rdlen == 1 && sldns_buffer_current(buf)[-1] == '}') {
      if(contnum > 0) {
        sldns_buffer_write_u8(buf, 0);
        log_err("line %d, bad key before }", *line);
        return 0;
      }
      return 1;
    } else if(rdlen == 1 && 
      isspace((unsigned char)sldns_buffer_current(buf)[-1])) {
      /* leave whitespace here */
    } else {
      /* not space or whatnot, so actual content */
      contnum ++;
      if(contnum == 1 && !quoted) {
        if(sldns_buffer_remaining(buf) < 8+1) {
          log_err("line %d, too long", *line);
          return 0;
        }  
        sldns_buffer_write(buf, " DNSKEY ", 8);
      }
    }
  }

  log_err("line %d, EOF before }", *line);
  return 0;
}

/**
 * Read a BIND9 like file with trust anchors in named.conf format.
 * @param anchors: anchor storage.
 * @param buffer: parsing buffer.
 * @param fname: string.
 * @return false on error.
 */
static int
anchor_read_bind_file(struct val_anchors* anchors, sldns_buffer* buffer,
  const char* fname)
{
  int line_nr = 1;
  FILE* in = fopen(fname, "r");
  int rdlen = 0;
  if(!in) {
    log_err("error opening file %s: %s", fname, strerror(errno));
    return 0;
  }
  verbose(VERB_QUERY, "reading in bind-compat-mode: '%s'", fname);
  /* scan for  trusted-keys  keyword, ignore everything else */
  sldns_buffer_clear(buffer);
  while((rdlen=readkeyword_bindfile(in, buffer, &line_nr, 1)) != 0) {
    if(rdlen != 12 || strncmp((char*)sldns_buffer_begin(buffer),
      "trusted-keys", 12) != 0) {
      sldns_buffer_clear(buffer);
      /* ignore everything but trusted-keys */
      continue;
    }
    if(!skip_to_special(in, buffer, &line_nr, '{')) {
      log_err("error in trusted key: \"%s\"", fname);
      fclose(in);
      return 0;
    }
    /* process contents */
    if(!process_bind_contents(anchors, buffer, &line_nr, in)) {
      log_err("error in trusted key: \"%s\"", fname);
      fclose(in);
      return 0;
    }
    if(!skip_to_special(in, buffer, &line_nr, ';')) {
      log_err("error in trusted key: \"%s\"", fname);
      fclose(in);
      return 0;
    }
    sldns_buffer_clear(buffer);
  }
  fclose(in);
  return 1;
}

/**
 * Read a BIND9 like files with trust anchors in named.conf format.
 * Performs wildcard processing of name.
 * @param anchors: anchor storage.
 * @param buffer: parsing buffer.
 * @param pat: pattern string. (can be wildcarded)
 * @return false on error.
 */
static int
anchor_read_bind_file_wild(struct val_anchors* anchors, sldns_buffer* buffer,
  const char* pat)
{
#ifdef HAVE_GLOB
  glob_t g;
  size_t i;
  int r, flags;
  if(!strchr(pat, '*') && !strchr(pat, '?') && !strchr(pat, '[') && 
    !strchr(pat, '{') && !strchr(pat, '~')) {
    return anchor_read_bind_file(anchors, buffer, pat);
  }
  verbose(VERB_QUERY, "wildcard found, processing %s", pat);
  flags = 0 
#ifdef GLOB_ERR
    | GLOB_ERR
#endif
#ifdef GLOB_NOSORT
    | GLOB_NOSORT
#endif
#ifdef GLOB_BRACE
    | GLOB_BRACE
#endif
#ifdef GLOB_TILDE
    | GLOB_TILDE
#endif
  ;
  memset(&g, 0, sizeof(g));
  r = glob(pat, flags, NULL, &g);
  if(r) {
    /* some error */
    if(r == GLOB_NOMATCH) {
      verbose(VERB_QUERY, "trusted-keys-file: "
        "no matches for %s", pat);
      return 1;
    } else if(r == GLOB_NOSPACE) {
      log_err("wildcard trusted-keys-file %s: "
        "pattern out of memory", pat);
    } else if(r == GLOB_ABORTED) {
      log_err("wildcard trusted-keys-file %s: expansion "
        "aborted (%s)", pat, strerror(errno));
    } else {
      log_err("wildcard trusted-keys-file %s: expansion "
        "failed (%s)", pat, strerror(errno));
    }
    /* ignore globs that yield no files */
    return 1; 
  }
  /* process files found, if any */
  for(i=0; i<(size_t)g.gl_pathc; i++) {
    if(!anchor_read_bind_file(anchors, buffer, g.gl_pathv[i])) {
      log_err("error reading wildcard "
        "trusted-keys-file: %s", g.gl_pathv[i]);
      globfree(&g);
      return 0;
    }
  }
  globfree(&g);
  return 1;
#else /* not HAVE_GLOB */
  return anchor_read_bind_file(anchors, buffer, pat);
#endif /* HAVE_GLOB */
}

/** 
 * Assemble an rrset structure for the type 
 * @param ta: trust anchor.
 * @param num: number of items to fetch from list.
 * @param type: fetch only items of this type.
 * @return rrset or NULL on error.
 */
static struct ub_packed_rrset_key*
assemble_it(struct trust_anchor* ta, size_t num, uint16_t type)
{
  struct ub_packed_rrset_key* pkey = (struct ub_packed_rrset_key*)
    malloc(sizeof(*pkey));
  struct packed_rrset_data* pd;
  struct ta_key* tk;
  size_t i;
  if(!pkey)
    return NULL;
  memset(pkey, 0, sizeof(*pkey));
  pkey->rk.dname = memdup(ta->name, ta->namelen);
  if(!pkey->rk.dname) {
    free(pkey);
    return NULL;
  }

  pkey->rk.dname_len = ta->namelen;
  pkey->rk.type = htons(type);
  pkey->rk.rrset_class = htons(ta->dclass);
  /* The rrset is build in an uncompressed way. This means it
   * cannot be copied in the normal way. */
  pd = (struct packed_rrset_data*)malloc(sizeof(*pd));
  if(!pd) {
    free(pkey->rk.dname);
    free(pkey);
    return NULL;
  }
  memset(pd, 0, sizeof(*pd));
  pd->count = num;
  pd->trust = rrset_trust_ultimate;
  pd->rr_len = (size_t*)reallocarray(NULL, num, sizeof(size_t));
  if(!pd->rr_len) {
    free(pd);
    free(pkey->rk.dname);
    free(pkey);
    return NULL;
  }
  pd->rr_ttl = (time_t*)reallocarray(NULL, num, sizeof(time_t));
  if(!pd->rr_ttl) {
    free(pd->rr_len);
    free(pd);
    free(pkey->rk.dname);
    free(pkey);
    return NULL;
  }
  pd->rr_data = (uint8_t**)reallocarray(NULL, num, sizeof(uint8_t*));
  if(!pd->rr_data) {
    free(pd->rr_ttl);
    free(pd->rr_len);
    free(pd);
    free(pkey->rk.dname);
    free(pkey);
    return NULL;
  }
  /* fill in rrs */
  i=0;
  for(tk = ta->keylist; tk; tk = tk->next) {
    if(tk->type != type)
      continue;
    pd->rr_len[i] = tk->len;
    /* reuse data ptr to allocation in talist */
    pd->rr_data[i] = tk->data;
    pd->rr_ttl[i] = 0;
    i++;
  }
  pkey->entry.data = (void*)pd;
  return pkey;
}

/**
 * Assemble structures for the trust DS and DNSKEY rrsets.
 * @param ta: trust anchor
 * @return: false on error.
 */
static int
anchors_assemble(struct trust_anchor* ta)
{
  if(ta->numDS > 0) {
    ta->ds_rrset = assemble_it(ta, ta->numDS, LDNS_RR_TYPE_DS);
    if(!ta->ds_rrset)
      return 0;
  }
  if(ta->numDNSKEY > 0) {
    ta->dnskey_rrset = assemble_it(ta, ta->numDNSKEY,
      LDNS_RR_TYPE_DNSKEY);
    if(!ta->dnskey_rrset)
      return 0;
  }
  return 1;
}

/**
 * Check DS algos for support, warn if not.
 * @param ta: trust anchor
 * @return number of DS anchors with unsupported algorithms.
 */
static size_t
anchors_ds_unsupported(struct trust_anchor* ta)
{
  size_t i, num = 0;
  for(i=0; i<ta->numDS; i++) {
    if(!ds_digest_algo_is_supported(ta->ds_rrset, i) || 
      !ds_key_algo_is_supported(ta->ds_rrset, i))
      num++;
  }
  return num;
}

/**
 * Check DNSKEY algos for support, warn if not.
 * @param ta: trust anchor
 * @return number of DNSKEY anchors with unsupported algorithms.
 */
static size_t
anchors_dnskey_unsupported(struct trust_anchor* ta)
{
  size_t i, num = 0;
  for(i=0; i<ta->numDNSKEY; i++) {
    if(!dnskey_algo_is_supported(ta->dnskey_rrset, i) ||
      !dnskey_size_is_supported(ta->dnskey_rrset, i))
      num++;
  }
  return num;
}

/**
 * Assemble the rrsets in the anchors, ready for use by validator.
 * @param anchors: trust anchor storage.
 * @return: false on error.
 */
static int
anchors_assemble_rrsets(struct val_anchors* anchors)
{
  struct trust_anchor* ta;
  struct trust_anchor* next;
  size_t nods, nokey;
  lock_basic_lock(&anchors->lock);
  ta=(struct trust_anchor*)rbtree_first(anchors->tree);
  while((rbnode_type*)ta != RBTREE_NULL) {
    next = (struct trust_anchor*)rbtree_next(&ta->node);
    lock_basic_lock(&ta->lock);
    if(ta->autr || (ta->numDS == 0 && ta->numDNSKEY == 0)) {
      lock_basic_unlock(&ta->lock);
      ta = next; /* skip */
      continue;
    }
    if(!anchors_assemble(ta)) {
      log_err("out of memory");
      lock_basic_unlock(&ta->lock);
      lock_basic_unlock(&anchors->lock);
      return 0;
    }
    nods = anchors_ds_unsupported(ta);
    nokey = anchors_dnskey_unsupported(ta);
    if(nods) {
      log_nametypeclass(NO_VERBOSE, "warning: unsupported "
        "algorithm for trust anchor", 
        ta->name, LDNS_RR_TYPE_DS, ta->dclass);
    }
    if(nokey) {
      log_nametypeclass(NO_VERBOSE, "warning: unsupported "
        "algorithm for trust anchor", 
        ta->name, LDNS_RR_TYPE_DNSKEY, ta->dclass);
    }
    if(nods == ta->numDS && nokey == ta->numDNSKEY) {
      char b[257];
      dname_str(ta->name, b);
      log_warn("trust anchor %s has no supported algorithms,"
        " the anchor is ignored (check if you need to"
        " upgrade unbound and "
#ifdef HAVE_LIBRESSL
        "libressl"
#else
        "openssl"
#endif
        ")", b);
      (void)rbtree_delete(anchors->tree, &ta->node);
      lock_basic_unlock(&ta->lock);
      anchors_delfunc(&ta->node, NULL);
      ta = next;
      continue;
    }
    lock_basic_unlock(&ta->lock);
    ta = next;
  }
  lock_basic_unlock(&anchors->lock);
  return 1;
}

int 
anchors_apply_cfg(struct val_anchors* anchors, struct config_file* cfg)
{
  struct config_strlist* f;
  const char** zstr;
  char* nm;
  sldns_buffer* parsebuf = sldns_buffer_new(65535);
  if(!parsebuf) {
    log_err("malloc error in anchors_apply_cfg.");
    return 0;
  }
  if(cfg->insecure_lan_zones) {
    for(zstr = as112_zones; *zstr; zstr++) {
      if(!anchor_insert_insecure(anchors, *zstr)) {
        log_err("error in insecure-lan-zones: %s", *zstr);
        sldns_buffer_free(parsebuf);
        return 0;
      }
    }
  }
  for(f = cfg->domain_insecure; f; f = f->next) {
    if(!f->str || f->str[0] == 0) /* empty "" */
      continue;
    if(!anchor_insert_insecure(anchors, f->str)) {
      log_err("error in domain-insecure: %s", f->str);
      sldns_buffer_free(parsebuf);
      return 0;
    }
  }
  for(f = cfg->trust_anchor_file_list; f; f = f->next) {
    if(!f->str || f->str[0] == 0) /* empty "" */
      continue;
    nm = f->str;
    if(cfg->chrootdir && cfg->chrootdir[0] && strncmp(nm,
      cfg->chrootdir, strlen(cfg->chrootdir)) == 0)
      nm += strlen(cfg->chrootdir);
    if(!anchor_read_file(anchors, parsebuf, nm, 0)) {
      log_err("error reading trust-anchor-file: %s", f->str);
      sldns_buffer_free(parsebuf);
      return 0;
    }
  }
  for(f = cfg->trusted_keys_file_list; f; f = f->next) {
    if(!f->str || f->str[0] == 0) /* empty "" */
      continue;
    nm = f->str;
    if(cfg->chrootdir && cfg->chrootdir[0] && strncmp(nm,
      cfg->chrootdir, strlen(cfg->chrootdir)) == 0)
      nm += strlen(cfg->chrootdir);
    if(!anchor_read_bind_file_wild(anchors, parsebuf, nm)) {
      log_err("error reading trusted-keys-file: %s", f->str);
      sldns_buffer_free(parsebuf);
      return 0;
    }
  }
  for(f = cfg->trust_anchor_list; f; f = f->next) {
    if(!f->str || f->str[0] == 0) /* empty "" */
      continue;
    if(!anchor_store_str(anchors, parsebuf, f->str)) {
      log_err("error in trust-anchor: \"%s\"", f->str);
      sldns_buffer_free(parsebuf);
      return 0;
    }
  }
  /* do autr last, so that it sees what anchors are filled by other
   * means can can print errors about double config for the name */
  for(f = cfg->auto_trust_anchor_file_list; f; f = f->next) {
    if(!f->str || f->str[0] == 0) /* empty "" */
      continue;
    nm = f->str;
    if(cfg->chrootdir && cfg->chrootdir[0] && strncmp(nm,
      cfg->chrootdir, strlen(cfg->chrootdir)) == 0)
      nm += strlen(cfg->chrootdir);
    if(!autr_read_file(anchors, nm)) {
      log_err("error reading auto-trust-anchor-file: %s", 
        f->str);
      sldns_buffer_free(parsebuf);
      return 0;
    }
  }
  /* first assemble, since it may delete useless anchors */
  anchors_assemble_rrsets(anchors);
  init_parents(anchors);
  sldns_buffer_free(parsebuf);
  if(verbosity >= VERB_ALGO) autr_debug_print(anchors);
  return 1;
}

struct trust_anchor* 
anchors_lookup(struct val_anchors* anchors,
        uint8_t* qname, size_t qname_len, uint16_t qclass)
{
  struct trust_anchor key;
  struct trust_anchor* result;
  rbnode_type* res = NULL;
  key.node.key = &key;
  key.name = qname;
  key.namelabs = dname_count_labels(qname);
  key.namelen = qname_len;
  key.dclass = qclass;
  lock_basic_lock(&anchors->lock);
  if(rbtree_find_less_equal(anchors->tree, &key, &res)) {
    /* exact */
    result = (struct trust_anchor*)res;
  } else {
    /* smaller element (or no element) */
    int m;
    result = (struct trust_anchor*)res;
    if(!result || result->dclass != qclass) {
      lock_basic_unlock(&anchors->lock);
      return NULL;
    }
    /* count number of labels matched */
    (void)dname_lab_cmp(result->name, result->namelabs, key.name,
      key.namelabs, &m);
    while(result) { /* go up until qname is subdomain of stub */
      if(result->namelabs <= m)
        break;
      result = result->parent;
    }
  }
  if(result) {
    lock_basic_lock(&result->lock);
  }
  lock_basic_unlock(&anchors->lock);
  return result;
}

size_t 
anchors_get_mem(struct val_anchors* anchors)
{
  struct trust_anchor *ta;
  size_t s = sizeof(*anchors);
  if(!anchors)
    return 0;
  RBTREE_FOR(ta, struct trust_anchor*, anchors->tree) {
    s += sizeof(*ta) + ta->namelen;
    /* keys and so on */
  }
  return s;
}

int
anchors_add_insecure(struct val_anchors* anchors, uint16_t c, uint8_t* nm)
{
  struct trust_anchor key;
  key.node.key = &key;
  key.name = nm;
  key.namelabs = dname_count_size_labels(nm, &key.namelen);
  key.dclass = c;
  lock_basic_lock(&anchors->lock);
  if(rbtree_search(anchors->tree, &key)) {
    lock_basic_unlock(&anchors->lock);
    /* nothing to do, already an anchor or insecure point */
    return 1;
  }
  if(!anchor_new_ta(anchors, nm, key.namelabs, key.namelen, c, 0)) {
    log_err("out of memory");
    lock_basic_unlock(&anchors->lock);
    return 0;
  }
  /* no other contents in new ta, because it is insecure point */
  anchors_init_parents_locked(anchors);
  lock_basic_unlock(&anchors->lock);
  return 1;
}

void
anchors_delete_insecure(struct val_anchors* anchors, uint16_t c,
        uint8_t* nm)
{
  struct trust_anchor key;
  struct trust_anchor* ta;
  key.node.key = &key;
  key.name = nm;
  key.namelabs = dname_count_size_labels(nm, &key.namelen);
  key.dclass = c;
  lock_basic_lock(&anchors->lock);
  if(!(ta=(struct trust_anchor*)rbtree_search(anchors->tree, &key))) {
    lock_basic_unlock(&anchors->lock);
    /* nothing there */
    return;
  }
  /* lock it to drive away other threads that use it */
  lock_basic_lock(&ta->lock);
  /* see if its really an insecure point */
  if(ta->keylist || ta->autr || ta->numDS || ta->numDNSKEY) {
    lock_basic_unlock(&anchors->lock);
    lock_basic_unlock(&ta->lock);
    /* its not an insecure point, do not remove it */
    return;
  }

  /* remove from tree */
  (void)rbtree_delete(anchors->tree, &ta->node);
  anchors_init_parents_locked(anchors);
  lock_basic_unlock(&anchors->lock);

  /* actual free of data */
  lock_basic_unlock(&ta->lock);
  anchors_delfunc(&ta->node, NULL);
}

/** compare two keytags, return -1, 0 or 1 */
static int
keytag_compare(const void* x, const void* y)
{
  if(*(uint16_t*)x == *(uint16_t*)y)
    return 0;
  if(*(uint16_t*)x > *(uint16_t*)y)
    return 1;
  return -1;
}

size_t
anchor_list_keytags(struct trust_anchor* ta, uint16_t* list, size_t num)
{
  size_t i, ret = 0;
  if(ta->numDS == 0 && ta->numDNSKEY == 0)
    return 0; /* insecure point */
  if(ta->numDS != 0 && ta->ds_rrset) {
    struct packed_rrset_data* d=(struct packed_rrset_data*)
      ta->ds_rrset->entry.data;
    for(i=0; i<d->count; i++) {
      if(ret == num) continue;
      list[ret++] = ds_get_keytag(ta->ds_rrset, i);
    }
  }
  if(ta->numDNSKEY != 0 && ta->dnskey_rrset) {
    struct packed_rrset_data* d=(struct packed_rrset_data*)
      ta->dnskey_rrset->entry.data;
    for(i=0; i<d->count; i++) {
      if(ret == num) continue;
      list[ret++] = dnskey_calc_keytag(ta->dnskey_rrset, i);
    }
  }
  qsort(list, ret, sizeof(*list), keytag_compare);
  return ret;
}

int
anchor_has_keytag(struct val_anchors* anchors, uint8_t* name, int namelabs,
  size_t namelen, uint16_t dclass, uint16_t keytag)
{
  uint16_t* taglist;
  uint16_t* tl;
  size_t numtag, i;
  struct trust_anchor* anchor = anchor_find(anchors,
    name, namelabs, namelen, dclass);
  if(!anchor)
    return 0;
  if(!anchor->numDS && !anchor->numDNSKEY) {
    lock_basic_unlock(&anchor->lock);
    return 0;
  }

  taglist = calloc(anchor->numDS + anchor->numDNSKEY, sizeof(*taglist));
  if(!taglist) {
    lock_basic_unlock(&anchor->lock);
    return 0;
  }

  numtag = anchor_list_keytags(anchor, taglist,
    anchor->numDS+anchor->numDNSKEY);
  lock_basic_unlock(&anchor->lock);
  if(!numtag) {
    free(taglist);
    return 0;
  }
  tl = taglist;
  for(i=0; i<numtag; i++) {
    if(*tl == keytag) {
      free(taglist);
      return 1;
    }
    tl++;
  }
  free(taglist);
  return 0;
}

Coverage Report

Created: 2023-03-26 06:08