/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <openssl_grpc/asn1.h>
#include <ctype.h>
#include <inttypes.h>
#include <string.h>
#include <openssl_grpc/bio.h>
#include <openssl_grpc/mem.h>
#include "charmap.h"
#include "internal.h"
// These flags must be distinct from |ESC_FLAGS| and fit in a byte.
// Character is a valid PrintableString character
#define CHARTYPE_PRINTABLESTRING 0x10
// Character needs escaping if it is the first character
#define CHARTYPE_FIRST_ESC_2253 0x20
// Character needs escaping if it is the last character
#define CHARTYPE_LAST_ESC_2253 0x40
#define CHARTYPE_BS_ESC (ASN1_STRFLGS_ESC_2253 | CHARTYPE_FIRST_ESC_2253 | CHARTYPE_LAST_ESC_2253)
#define ESC_FLAGS (ASN1_STRFLGS_ESC_2253 | \
ASN1_STRFLGS_ESC_QUOTE | \
ASN1_STRFLGS_ESC_CTRL | \
ASN1_STRFLGS_ESC_MSB)
static int maybe_write(BIO *out, const void *buf, int len)
{
/* If |out| is NULL, ignore the output but report the length. */
return out == NULL || BIO_write(out, buf, len) == len;
}
/*
* This function handles display of strings, one character at a time. It is
* passed an unsigned long for each character because it could come from 2 or
* even 4 byte forms.
*/
#define HEX_SIZE(type) (sizeof(type)*2)
static int do_esc_char(uint32_t c, unsigned char flags, char *do_quotes,
BIO *out)
{
unsigned char chflgs, chtmp;
char tmphex[HEX_SIZE(uint32_t) + 3];
if (c > 0xffff) {
BIO_snprintf(tmphex, sizeof tmphex, "\\W%08" PRIX32, c);
if (!maybe_write(out, tmphex, 10))
return -1;
return 10;
}
if (c > 0xff) {
BIO_snprintf(tmphex, sizeof tmphex, "\\U%04" PRIX32, c);
if (!maybe_write(out, tmphex, 6))
return -1;
return 6;
}
chtmp = (unsigned char)c;
if (chtmp > 0x7f)
chflgs = flags & ASN1_STRFLGS_ESC_MSB;
else
chflgs = char_type[chtmp] & flags;
if (chflgs & CHARTYPE_BS_ESC) {
/* If we don't escape with quotes, signal we need quotes */
if (chflgs & ASN1_STRFLGS_ESC_QUOTE) {
if (do_quotes)
*do_quotes = 1;
if (!maybe_write(out, &chtmp, 1))
return -1;
return 1;
}
if (!maybe_write(out, "\\", 1))
return -1;
if (!maybe_write(out, &chtmp, 1))
return -1;
return 2;
}
if (chflgs & (ASN1_STRFLGS_ESC_CTRL | ASN1_STRFLGS_ESC_MSB)) {
BIO_snprintf(tmphex, 11, "\\%02X", chtmp);
if (!maybe_write(out, tmphex, 3))
return -1;
return 3;
}
/*
* If we get this far and do any escaping at all must escape the escape
* character itself: backslash.
*/
if (chtmp == '\\' && flags & ESC_FLAGS) {
if (!maybe_write(out, "\\\\", 2))
return -1;
return 2;
}
if (!maybe_write(out, &chtmp, 1))
return -1;
return 1;
}
#define BUF_TYPE_WIDTH_MASK 0x7
#define BUF_TYPE_CONVUTF8 0x8
/*
* This function sends each character in a buffer to do_esc_char(). It
* interprets the content formats and converts to or from UTF8 as
* appropriate.
*/
static int do_buf(unsigned char *buf, int buflen,
int type, unsigned char flags, char *quotes, BIO *out)
{
int i, outlen, len, charwidth;
unsigned char orflags, *p, *q;
uint32_t c;
p = buf;
q = buf + buflen;
outlen = 0;
charwidth = type & BUF_TYPE_WIDTH_MASK;
switch (charwidth) {
case 4:
if (buflen & 3) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_UNIVERSALSTRING);
return -1;
}
break;
case 2:
if (buflen & 1) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_BMPSTRING);
return -1;
}
break;
default:
break;
}
while (p != q) {
if (p == buf && flags & ASN1_STRFLGS_ESC_2253)
orflags = CHARTYPE_FIRST_ESC_2253;
else
orflags = 0;
/* TODO(davidben): Replace this with |cbs_get_ucs2_be|, etc., to check
* for invalid codepoints. */
switch (charwidth) {
case 4:
c = ((uint32_t)*p++) << 24;
c |= ((uint32_t)*p++) << 16;
c |= ((uint32_t)*p++) << 8;
c |= *p++;
break;
case 2:
c = ((uint32_t)*p++) << 8;
c |= *p++;
break;
case 1:
c = *p++;
break;
case 0:
i = UTF8_getc(p, buflen, &c);
if (i < 0)
return -1; /* Invalid UTF8String */
buflen -= i;
p += i;
break;
default:
return -1; /* invalid width */
}
if (p == q && flags & ASN1_STRFLGS_ESC_2253)
orflags = CHARTYPE_LAST_ESC_2253;
if (type & BUF_TYPE_CONVUTF8) {
unsigned char utfbuf[6];
int utflen;
utflen = UTF8_putc(utfbuf, sizeof utfbuf, c);
for (i = 0; i < utflen; i++) {
/*
* We don't need to worry about setting orflags correctly
* because if utflen==1 its value will be correct anyway
* otherwise each character will be > 0x7f and so the
* character will never be escaped on first and last.
*/
len = do_esc_char(utfbuf[i], (unsigned char)(flags | orflags),
quotes, out);
if (len < 0)
return -1;
outlen += len;
}
} else {
len = do_esc_char(c, (unsigned char)(flags | orflags), quotes, out);
if (len < 0)
return -1;
outlen += len;
}
}
return outlen;
}
/* This function hex dumps a buffer of characters */
static int do_hex_dump(BIO *out, unsigned char *buf, int buflen)
{
static const char hexdig[] = "0123456789ABCDEF";
unsigned char *p, *q;
char hextmp[2];
if (out) {
p = buf;
q = buf + buflen;
while (p != q) {
hextmp[0] = hexdig[*p >> 4];
hextmp[1] = hexdig[*p & 0xf];
if (!maybe_write(out, hextmp, 2))
return -1;
p++;
}
}
return buflen << 1;
}
/*
* "dump" a string. This is done when the type is unknown, or the flags
* request it. We can either dump the content octets or the entire DER
* encoding. This uses the RFC 2253 #01234 format.
*/
static int do_dump(unsigned long lflags, BIO *out, const ASN1_STRING *str)
{
if (!maybe_write(out, "#", 1)) {
return -1;
}
/* If we don't dump DER encoding just dump content octets */
if (!(lflags & ASN1_STRFLGS_DUMP_DER)) {
int outlen = do_hex_dump(out, str->data, str->length);
if (outlen < 0) {
return -1;
}
return outlen + 1;
}
/*
* Placing the ASN1_STRING in a temporary ASN1_TYPE allows the DER encoding
* to readily obtained.
*/
ASN1_TYPE t;
t.type = str->type;
/* Negative INTEGER and ENUMERATED values are the only case where
* |ASN1_STRING| and |ASN1_TYPE| types do not match.
*
* TODO(davidben): There are also some type fields which, in |ASN1_TYPE|, do
* not correspond to |ASN1_STRING|. It is unclear whether those are allowed
* in |ASN1_STRING| at all, or what the space of allowed types is.
* |ASN1_item_ex_d2i| will never produce such a value so, for now, we say
* this is an invalid input. But this corner of the library in general
* should be more robust. */
if (t.type == V_ASN1_NEG_INTEGER) {
t.type = V_ASN1_INTEGER;
} else if (t.type == V_ASN1_NEG_ENUMERATED) {
t.type = V_ASN1_ENUMERATED;
}
t.value.asn1_string = (ASN1_STRING *)str;
unsigned char *der_buf = NULL;
int der_len = i2d_ASN1_TYPE(&t, &der_buf);
if (der_len < 0) {
return -1;
}
int outlen = do_hex_dump(out, der_buf, der_len);
OPENSSL_free(der_buf);
if (outlen < 0) {
return -1;
}
return outlen + 1;
}
/*
* Lookup table to convert tags to character widths, 0 = UTF8 encoded, -1 is
* used for non string types otherwise it is the number of bytes per
* character
*/
static const signed char tag2nbyte[] = {
-1, -1, -1, -1, -1, /* 0-4 */
-1, -1, -1, -1, -1, /* 5-9 */
-1, -1, 0, -1, /* 10-13 */
-1, -1, -1, -1, /* 15-17 */
1, 1, 1, /* 18-20 */
-1, 1, 1, 1, /* 21-24 */
-1, 1, -1, /* 25-27 */
4, -1, 2 /* 28-30 */
};
/*
* This is the main function, print out an ASN1_STRING taking note of various
* escape and display options. Returns number of characters written or -1 if
* an error occurred.
*/
int ASN1_STRING_print_ex(BIO *out, const ASN1_STRING *str, unsigned long lflags)
{
int outlen, len;
int type;
char quotes;
unsigned char flags;
quotes = 0;
/* Keep a copy of escape flags */
flags = (unsigned char)(lflags & ESC_FLAGS);
type = str->type;
outlen = 0;
if (lflags & ASN1_STRFLGS_SHOW_TYPE) {
const char *tagname;
tagname = ASN1_tag2str(type);
outlen += strlen(tagname);
if (!maybe_write(out, tagname, outlen) || !maybe_write(out, ":", 1))
return -1;
outlen++;
}
/* Decide what to do with type, either dump content or display it */
/* Dump everything */
if (lflags & ASN1_STRFLGS_DUMP_ALL)
type = -1;
/* Ignore the string type */
else if (lflags & ASN1_STRFLGS_IGNORE_TYPE)
type = 1;
else {
/* Else determine width based on type */
if ((type > 0) && (type < 31))
type = tag2nbyte[type];
else
type = -1;
if ((type == -1) && !(lflags & ASN1_STRFLGS_DUMP_UNKNOWN))
type = 1;
}
if (type == -1) {
len = do_dump(lflags, out, str);
if (len < 0)
return -1;
outlen += len;
return outlen;
}
if (lflags & ASN1_STRFLGS_UTF8_CONVERT) {
/*
* Note: if string is UTF8 and we want to convert to UTF8 then we
* just interpret it as 1 byte per character to avoid converting
* twice.
*/
if (!type)
type = 1;
else
type |= BUF_TYPE_CONVUTF8;
}
len = do_buf(str->data, str->length, type, flags, "es, NULL);
if (len < 0)
return -1;
outlen += len;
if (quotes)
outlen += 2;
if (!out)
return outlen;
if (quotes && !maybe_write(out, "\"", 1))
return -1;
if (do_buf(str->data, str->length, type, flags, NULL, out) < 0)
return -1;
if (quotes && !maybe_write(out, "\"", 1))
return -1;
return outlen;
}
int ASN1_STRING_print_ex_fp(FILE *fp, const ASN1_STRING *str,
unsigned long flags)
{
BIO *bio = NULL;
if (fp != NULL) {
/* If |fp| is NULL, this function returns the number of bytes without
* writing. */
bio = BIO_new_fp(fp, BIO_NOCLOSE);
if (bio == NULL) {
return -1;
}
}
int ret = ASN1_STRING_print_ex(bio, str, flags);
BIO_free(bio);
return ret;
}
int ASN1_STRING_to_UTF8(unsigned char **out, const ASN1_STRING *in)
{
ASN1_STRING stmp, *str = &stmp;
int mbflag, type, ret;
if (!in)
return -1;
type = in->type;
if ((type < 0) || (type > 30))
return -1;
mbflag = tag2nbyte[type];
if (mbflag == -1)
return -1;
mbflag |= MBSTRING_FLAG;
stmp.data = NULL;
stmp.length = 0;
stmp.flags = 0;
ret = ASN1_mbstring_copy(&str, in->data, in->length, mbflag,
B_ASN1_UTF8STRING);
if (ret < 0)
return ret;
*out = stmp.data;
return stmp.length;
}
int ASN1_STRING_print(BIO *bp, const ASN1_STRING *v)
{
int i, n;
char buf[80];
const char *p;
if (v == NULL)
return (0);
n = 0;
p = (const char *)v->data;
for (i = 0; i < v->length; i++) {
if ((p[i] > '~') || ((p[i] < ' ') &&
(p[i] != '\n') && (p[i] != '\r')))
buf[n] = '.';
else
buf[n] = p[i];
n++;
if (n >= 80) {
if (BIO_write(bp, buf, n) <= 0)
return (0);
n = 0;
}
}
if (n > 0)
if (BIO_write(bp, buf, n) <= 0)
return (0);
return (1);
}
int ASN1_TIME_print(BIO *bp, const ASN1_TIME *tm)
{
if (tm->type == V_ASN1_UTCTIME)
return ASN1_UTCTIME_print(bp, tm);
if (tm->type == V_ASN1_GENERALIZEDTIME)
return ASN1_GENERALIZEDTIME_print(bp, tm);
BIO_write(bp, "Bad time value", 14);
return (0);
}
static const char *const mon[12] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
int ASN1_GENERALIZEDTIME_print(BIO *bp, const ASN1_GENERALIZEDTIME *tm)
{
char *v;
int gmt = 0;
int i;
int y = 0, M = 0, d = 0, h = 0, m = 0, s = 0;
char *f = NULL;
int f_len = 0;
i = tm->length;
v = (char *)tm->data;
if (i < 12)
goto err;
if (v[i - 1] == 'Z')
gmt = 1;
for (i = 0; i < 12; i++)
if ((v[i] > '9') || (v[i] < '0'))
goto err;
y = (v[0] - '0') * 1000 + (v[1] - '0') * 100 + (v[2] - '0') * 10 + (v[3] -
'0');
M = (v[4] - '0') * 10 + (v[5] - '0');
if ((M > 12) || (M < 1))
goto err;
d = (v[6] - '0') * 10 + (v[7] - '0');
h = (v[8] - '0') * 10 + (v[9] - '0');
m = (v[10] - '0') * 10 + (v[11] - '0');
if (tm->length >= 14 &&
(v[12] >= '0') && (v[12] <= '9') &&
(v[13] >= '0') && (v[13] <= '9')) {
s = (v[12] - '0') * 10 + (v[13] - '0');
/* Check for fractions of seconds. */
if (tm->length >= 15 && v[14] == '.') {
int l = tm->length;
f = &v[14]; /* The decimal point. */
f_len = 1;
while (14 + f_len < l && f[f_len] >= '0' && f[f_len] <= '9')
++f_len;
}
}
if (BIO_printf(bp, "%s %2d %02d:%02d:%02d%.*s %d%s",
mon[M - 1], d, h, m, s, f_len, f, y,
(gmt) ? " GMT" : "") <= 0)
return (0);
else
return (1);
err:
BIO_write(bp, "Bad time value", 14);
return (0);
}
// consume_two_digits is a helper function for ASN1_UTCTIME_print. If |*v|,
// assumed to be |*len| bytes long, has two leading digits, updates |*out| with
// their value, updates |v| and |len|, and returns one. Otherwise, returns
// zero.
static int consume_two_digits(int* out, const char **v, int *len) {
if (*len < 2|| !isdigit((*v)[0]) || !isdigit((*v)[1])) {
return 0;
}
*out = ((*v)[0] - '0') * 10 + ((*v)[1] - '0');
*len -= 2;
*v += 2;
return 1;
}
// consume_zulu_timezone is a helper function for ASN1_UTCTIME_print. If |*v|,
// assumed to be |*len| bytes long, starts with "Z" then it updates |*v| and
// |*len| and returns one. Otherwise returns zero.
static int consume_zulu_timezone(const char **v, int *len) {
if (*len == 0 || (*v)[0] != 'Z') {
return 0;
}
*len -= 1;
*v += 1;
return 1;
}
int ASN1_UTCTIME_print(BIO *bp, const ASN1_UTCTIME *tm) {
const char *v = (const char *)tm->data;
int len = tm->length;
int Y = 0, M = 0, D = 0, h = 0, m = 0, s = 0;
// YYMMDDhhmm are required to be present.
if (!consume_two_digits(&Y, &v, &len) ||
!consume_two_digits(&M, &v, &len) ||
!consume_two_digits(&D, &v, &len) ||
!consume_two_digits(&h, &v, &len) ||
!consume_two_digits(&m, &v, &len)) {
goto err;
}
// https://tools.ietf.org/html/rfc5280, section 4.1.2.5.1, requires seconds
// to be present, but historically this code has forgiven its absence.
consume_two_digits(&s, &v, &len);
// https://tools.ietf.org/html/rfc5280, section 4.1.2.5.1, specifies this
// interpretation of the year.
if (Y < 50) {
Y += 2000;
} else {
Y += 1900;
}
if (M > 12 || M == 0) {
goto err;
}
if (D > 31 || D == 0) {
goto err;
}
if (h > 23 || m > 59 || s > 60) {
goto err;
}
// https://tools.ietf.org/html/rfc5280, section 4.1.2.5.1, requires the "Z"
// to be present, but historically this code has forgiven its absence.
const int is_gmt = consume_zulu_timezone(&v, &len);
// https://tools.ietf.org/html/rfc5280, section 4.1.2.5.1, does not permit
// the specification of timezones using the +hhmm / -hhmm syntax, which is
// the only other thing that might legitimately be found at the end.
if (len) {
goto err;
}
return BIO_printf(bp, "%s %2d %02d:%02d:%02d %d%s", mon[M - 1], D, h, m, s, Y,
is_gmt ? " GMT" : "") > 0;
err:
BIO_write(bp, "Bad time value", 14);
return 0;
}