462 lines
12 KiB
C
462 lines
12 KiB
C
static const char rcsid[] = "$Header: /proj/cvs/isc/bind8/src/lib/dst/support.c,v 1.8 1999/10/13 16:39:24 vixie Exp $";
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/*
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* Portions Copyright (c) 1995-1998 by Trusted Information Systems, Inc.
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*
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* Permission to use, copy modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND TRUSTED INFORMATION SYSTEMS
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* TRUSTED INFORMATION SYSTEMS BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THE SOFTWARE.
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*/
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#include "port_before.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <memory.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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#include "dst_internal.h"
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#include "port_after.h"
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/*
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* dst_s_conv_bignum_u8_to_b64
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* This function converts binary data stored as a u_char[] to a
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* base-64 string. Leading zeroes are discarded. If a header is
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* supplied, it is prefixed to the input prior to encoding. The
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* output is \n\0 terminated (the \0 is not included in output length).
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* Parameters
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* out_buf binary data to convert
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* header character string to prefix to the output (label)
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* bin_data binary data
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* bin_len size of binary data
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* Return
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* -1 not enough space in output work area
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* 0 no output
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* >0 number of bytes written to output work area
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*/
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int
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dst_s_conv_bignum_u8_to_b64(char *out_buf, const int out_len,
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const char *header, const u_char *bin_data,
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const int bin_len)
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{
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const u_char *bp = bin_data;
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char *op = out_buf;
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int lenh = 0, len64 = 0;
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int local_in_len = bin_len;
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int local_out_len = out_len;
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if (bin_data == NULL || bin_len <= 0) /* no data no */
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return (0);
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if (out_buf == NULL || out_len <= 0) /* no output_work area */
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return (-1);
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/* suppress leading \0 */
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for (; (*bp == 0x0) && (local_in_len > 0); local_in_len--)
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bp++;
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if (header) { /* add header to output string */
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lenh = strlen(header);
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if (lenh < out_len)
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memcpy(op, header, lenh);
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else
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return (-1);
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local_out_len -= lenh;
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op += lenh;
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}
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len64 = b64_ntop(bp, local_in_len, op, local_out_len - 2);
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if (len64 < 0)
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return (-1);
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op += len64++;
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*(op++) = '\n'; /* put CR in the output */
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*op = '\0'; /* make sure output is 0 terminated */
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return (lenh + len64);
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}
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/*
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* dst_s_verify_str()
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* Validate that the input string(*str) is at the head of the input
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* buffer(**buf). If so, move the buffer head pointer (*buf) to
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* the first byte of data following the string(*str).
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* Parameters
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* buf Input buffer.
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* str Input string.
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* Return
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* 0 *str is not the head of **buff
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* 1 *str is the head of **buff, *buf is is advanced to
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* the tail of **buf.
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*/
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int
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dst_s_verify_str(const char **buf, const char *str)
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{
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int b, s;
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if (*buf == NULL) /* error checks */
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return (0);
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if (str == NULL || *str == '\0')
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return (1);
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b = strlen(*buf); /* get length of strings */
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s = strlen(str);
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if (s > b || strncmp(*buf, str, s)) /* check if same */
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return (0); /* not a match */
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(*buf) += s; /* advance pointer */
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return (1);
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}
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/*
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* dst_s_conv_bignum_b64_to_u8
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* Read a line of base-64 encoded string from the input buffer,
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* convert it to binary, and store it in an output area. The
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* input buffer is read until reaching a newline marker or the
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* end of the buffer. The binary data is stored in the last X
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* number of bytes of the output area where X is the size of the
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* binary output. If the operation is successful, the input buffer
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* pointer is advanced. This procedure does not do network to host
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* byte order conversion.
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* Parameters
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* buf Pointer to encoded input string. Pointer is updated if
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* function is successfull.
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* loc Output area.
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* loclen Size in bytes of output area.
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* Return
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* >0 Return = number of bytes of binary data stored in loc.
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* 0 Failure.
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*/
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int
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dst_s_conv_bignum_b64_to_u8(const char **buf, u_char *loc, const int loclen)
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{
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int blen;
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char *bp;
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u_char bstr[RAW_KEY_SIZE];
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if (buf == NULL || *buf == NULL) { /* error checks */
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EREPORT(("dst_s_conv_bignum_b64_to_u8: null input buffer.\n"));
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return (0);
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}
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bp = strchr(*buf, '\n'); /* find length of input line */
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if (bp != NULL)
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*bp = (u_char) NULL;
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blen = b64_pton(*buf, bstr, sizeof(bstr));
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if (blen <= 0) {
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EREPORT(("dst_s_conv_bignum_b64_to_u8: decoded value is null.\n"));
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return (0);
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}
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else if (loclen < blen) {
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EREPORT(("dst_s_conv_bignum_b64_to_u8: decoded value is longer than output buffer.\n"));
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return (0);
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}
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if (bp)
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*buf = bp; /* advancing buffer past \n */
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memset(loc, 0, loclen - blen); /* clearing unused output area */
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memcpy(loc + loclen - blen, bstr, blen); /* write last blen bytes */
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return (blen);
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}
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/*
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* dst_s_calculate_bits
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* Given a binary number represented in a u_char[], determine
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* the number of significant bits used.
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* Parameters
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* str An input character string containing a binary number.
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* max_bits The maximum possible significant bits.
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* Return
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* N The number of significant bits in str.
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*/
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int
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dst_s_calculate_bits(const u_char *str, const int max_bits)
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{
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const u_char *p = str;
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u_char i, j = 0x80;
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int bits;
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for (bits = max_bits; *p == 0x00 && bits > 0; p++)
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bits -= 8;
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for (i = *p; (i & j) != j; j >>= 1)
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bits--;
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return (bits);
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}
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/*
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* calculates a checksum used in kmt for a id.
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* takes an array of bytes and a length.
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* returns a 16 bit checksum.
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*/
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u_int16_t
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dst_s_id_calc(const u_char *key, const int keysize)
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{
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u_int32_t ac;
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const u_char *kp = key;
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int size = keysize;
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if (!key || (keysize <= 0))
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return (-1);
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for (ac = 0; size > 1; size -= 2, kp += 2)
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ac += ((*kp) << 8) + *(kp + 1);
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if (size > 0)
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ac += ((*kp) << 8);
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ac += (ac >> 16) & 0xffff;
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return (ac & 0xffff);
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}
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/*
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* dst_s_dns_key_id() Function to calculated DNSSEC footprint from KEY reocrd
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* rdata (all of record)
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* Input:
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* dns_key_rdata: the raw data in wire format
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* rdata_len: the size of the input data
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* Output:
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* the key footprint/id calcuated from the key data
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*/
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u_int16_t
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dst_s_dns_key_id(const u_char *dns_key_rdata, const int rdata_len)
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{
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int key_data = 4;
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if (!dns_key_rdata || (rdata_len < key_data))
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return 0;
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/* check the extended parameters bit in the DNS Key RR flags */
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if (dst_s_get_int16(dns_key_rdata) & DST_EXTEND_FLAG)
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key_data += 2;
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/* compute id */
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if (dns_key_rdata[3] == KEY_RSA) /* Algorithm RSA */
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return dst_s_get_int16((u_char *)
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&dns_key_rdata[rdata_len - 3]);
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else
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/* compute a checksum on the key part of the key rr */
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return dst_s_id_calc(&dns_key_rdata[key_data],
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(rdata_len - key_data));
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}
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/*
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* dst_s_get_int16
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* This routine extracts a 16 bit integer from a two byte character
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* string. The character string is assumed to be in network byte
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* order and may be unaligned. The number returned is in host order.
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* Parameter
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* buf A two byte character string.
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* Return
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* The converted integer value.
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*/
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u_int16_t
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dst_s_get_int16(const u_char *buf)
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{
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register u_int16_t a = 0;
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a = ((u_int16_t)(buf[0] << 8)) | ((u_int16_t)(buf[1]));
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return (a);
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}
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/*
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* dst_s_get_int32
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* This routine extracts a 32 bit integer from a four byte character
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* string. The character string is assumed to be in network byte
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* order and may be unaligned. The number returned is in host order.
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* Parameter
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* buf A four byte character string.
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* Return
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* The converted integer value.
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*/
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u_int32_t
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dst_s_get_int32(const u_char *buf)
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{
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register u_int32_t a = 0;
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a = ((u_int32_t)(buf[0] << 24)) | ((u_int32_t)(buf[1] << 16)) |
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((u_int32_t)(buf[2] << 8)) | ((u_int32_t)(buf[3]));
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return (a);
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}
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/*
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* dst_s_put_int16
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* Take a 16 bit integer and store the value in a two byte
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* character string. The integer is assumed to be in network
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* order and the string is returned in host order.
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*
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* Parameters
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* buf Storage for a two byte character string.
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* val 16 bit integer.
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*/
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void
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dst_s_put_int16(u_int8_t *buf, const u_int16_t val)
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{
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buf[0] = (u_int8_t)(val >> 8);
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buf[1] = (u_int8_t)(val);
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}
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/*
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* dst_s_put_int32
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* Take a 32 bit integer and store the value in a four byte
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* character string. The integer is assumed to be in network
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* order and the string is returned in host order.
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*
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* Parameters
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* buf Storage for a four byte character string.
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* val 32 bit integer.
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*/
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void
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dst_s_put_int32(u_int8_t *buf, const u_int32_t val)
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{
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buf[0] = (u_int8_t)(val >> 24);
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buf[1] = (u_int8_t)(val >> 16);
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buf[2] = (u_int8_t)(val >> 8);
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buf[3] = (u_int8_t)(val);
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}
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/*
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* dst_s_filename_length
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*
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* This function returns the number of bytes needed to hold the
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* filename for a key file. '/', '\' and ':' are not allowed.
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* form: K<keyname>+<alg>+<id>.<suffix>
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*
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* Returns 0 if the filename would contain either '\', '/' or ':'
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*/
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size_t
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dst_s_filename_length(const char *name, const char *suffix)
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{
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if (name == NULL)
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return (0);
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if (strrchr(name, '\\'))
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return (0);
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if (strrchr(name, '/'))
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return (0);
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if (strrchr(name, ':'))
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return (0);
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if (suffix == NULL)
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return (0);
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if (strrchr(suffix, '\\'))
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return (0);
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if (strrchr(suffix, '/'))
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return (0);
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if (strrchr(suffix, ':'))
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return (0);
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return (1 + strlen(name) + 6 + strlen(suffix));
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}
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/*
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* dst_s_build_filename ()
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* Builds a key filename from the key name, it's id, and a
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* suffix. '\', '/' and ':' are not allowed. fA filename is of the
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* form: K<keyname><id>.<suffix>
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* form: K<keyname>+<alg>+<id>.<suffix>
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*
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* Returns -1 if the conversion fails:
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* if the filename would be too long for space allotted
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* if the filename would contain a '\', '/' or ':'
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* Returns 0 on success
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*/
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int
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dst_s_build_filename(char *filename, const char *name, u_int16_t id,
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int alg, const char *suffix, size_t filename_length)
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{
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u_int32_t my_id;
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if (filename == NULL)
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return (-1);
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memset(filename, 0, filename_length);
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if (name == NULL)
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return (-1);
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if (suffix == NULL)
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return (-1);
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if (filename_length < 1 + strlen(name) + 4 + 6 + 1 + strlen(suffix))
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return (-1);
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my_id = id;
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sprintf(filename, "K%s+%03d+%05d.%s", name, alg, my_id,
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(char *) suffix);
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if (strrchr(filename, '/'))
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return (-1);
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if (strrchr(filename, '\\'))
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return (-1);
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if (strrchr(filename, ':'))
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return (-1);
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return (0);
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}
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/*
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* dst_s_fopen ()
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* Open a file in the dst_path directory. If perm is specified, the
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* file is checked for existence first, and not opened if it exists.
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* Parameters
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* filename File to open
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* mode Mode to open the file (passed directly to fopen)
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* perm File permission, if creating a new file.
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* Returns
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* NULL Failure
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* NON-NULL (FILE *) of opened file.
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*/
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FILE *
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dst_s_fopen(const char *filename, const char *mode, int perm)
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{
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FILE *fp;
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char pathname[PATH_MAX];
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int plen = sizeof(pathname);
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if (*dst_path != '\0') {
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strcpy(pathname, dst_path);
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plen -= strlen(pathname);
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}
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else
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pathname[0] = '\0';
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if (plen > strlen(filename))
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strncpy(&pathname[PATH_MAX - plen], filename, plen-1);
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else
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return (NULL);
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fp = fopen(pathname, mode);
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if (perm)
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chmod(pathname, perm);
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return (fp);
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}
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void
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dst_s_dump(const int mode, const u_char *data, const int size,
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const char *msg)
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{
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if (size > 0) {
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#ifdef LONG_TEST
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static u_char scratch[1000];
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int n ;
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n = b64_ntop(data, scratch, size, sizeof(scratch));
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printf("%s: %x %d %s\n", msg, mode, n, scratch);
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#else
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printf("%s,%x %d\n", msg, mode, size);
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#endif
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}
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}
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