/* 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 <limits.h> #include <string.h> #include <openssl_grpc/err.h> #include <openssl_grpc/mem.h> #include "../internal.h" #include "internal.h" int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, const unsigned char *d, int len) { return ASN1_STRING_set(x, d, len); } int asn1_bit_string_length(const ASN1_BIT_STRING *str, uint8_t *out_padding_bits) { int len = str->length; if (str->flags & ASN1_STRING_FLAG_BITS_LEFT) { // If the string is already empty, it cannot have padding bits. *out_padding_bits = len == 0 ? 0 : str->flags & 0x07; return len; } // TODO(https://crbug.com/boringssl/447): If we move this logic to // |ASN1_BIT_STRING_set_bit|, can we remove this representation? while (len > 0 && str->data[len - 1] == 0) { len--; } uint8_t padding_bits = 0; if (len > 0) { uint8_t last = str->data[len - 1]; assert(last != 0); for (; padding_bits < 7; padding_bits++) { if (last & (1 << padding_bits)) { break; } } } *out_padding_bits = padding_bits; return len; } int ASN1_BIT_STRING_num_bytes(const ASN1_BIT_STRING *str, size_t *out) { uint8_t padding_bits; int len = asn1_bit_string_length(str, &padding_bits); if (padding_bits != 0) { return 0; } *out = len; return 1; } int i2c_ASN1_BIT_STRING(const ASN1_BIT_STRING *a, unsigned char **pp) { if (a == NULL) { return 0; } uint8_t bits; int len = asn1_bit_string_length(a, &bits); int ret = 1 + len; if (pp == NULL) { return ret; } uint8_t *p = *pp; *(p++) = bits; OPENSSL_memcpy(p, a->data, len); if (len > 0) { p[len - 1] &= (0xff << bits); } p += len; *pp = p; return (ret); } ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, const unsigned char **pp, long len) { ASN1_BIT_STRING *ret = NULL; const unsigned char *p; unsigned char *s; int padding; if (len < 1) { OPENSSL_PUT_ERROR(ASN1, ASN1_R_STRING_TOO_SHORT); goto err; } if (len > INT_MAX) { OPENSSL_PUT_ERROR(ASN1, ASN1_R_STRING_TOO_LONG); goto err; } if ((a == NULL) || ((*a) == NULL)) { if ((ret = ASN1_BIT_STRING_new()) == NULL) return (NULL); } else ret = (*a); p = *pp; padding = *(p++); len--; if (padding > 7) { OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); goto err; } /* Unused bits in a BIT STRING must be zero. */ uint8_t padding_mask = (1 << padding) - 1; if (padding != 0 && (len < 1 || (p[len - 1] & padding_mask) != 0)) { OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_BIT_STRING_PADDING); goto err; } /* * We do this to preserve the settings. If we modify the settings, via * the _set_bit function, we will recalculate on output */ ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */ ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | padding); /* set */ if (len > 0) { s = OPENSSL_memdup(p, len); if (s == NULL) { OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); goto err; } p += len; } else { s = NULL; } ret->length = (int)len; OPENSSL_free(ret->data); ret->data = s; ret->type = V_ASN1_BIT_STRING; if (a != NULL) (*a) = ret; *pp = p; return (ret); err: if ((ret != NULL) && ((a == NULL) || (*a != ret))) ASN1_BIT_STRING_free(ret); return (NULL); } /* * These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> */ int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) { int w, v, iv; unsigned char *c; w = n / 8; v = 1 << (7 - (n & 0x07)); iv = ~v; if (!value) v = 0; if (a == NULL) return 0; a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */ if ((a->length < (w + 1)) || (a->data == NULL)) { if (!value) return (1); /* Don't need to set */ if (a->data == NULL) c = (unsigned char *)OPENSSL_malloc(w + 1); else c = (unsigned char *)OPENSSL_realloc(a->data, w + 1); if (c == NULL) { OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); return 0; } if (w + 1 - a->length > 0) OPENSSL_memset(c + a->length, 0, w + 1 - a->length); a->data = c; a->length = w + 1; } a->data[w] = ((a->data[w]) & iv) | v; while ((a->length > 0) && (a->data[a->length - 1] == 0)) a->length--; return (1); } int ASN1_BIT_STRING_get_bit(const ASN1_BIT_STRING *a, int n) { int w, v; w = n / 8; v = 1 << (7 - (n & 0x07)); if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL)) return (0); return ((a->data[w] & v) != 0); } /* * Checks if the given bit string contains only bits specified by * the flags vector. Returns 0 if there is at least one bit set in 'a' * which is not specified in 'flags', 1 otherwise. * 'len' is the length of 'flags'. */ int ASN1_BIT_STRING_check(const ASN1_BIT_STRING *a, const unsigned char *flags, int flags_len) { int i, ok; /* Check if there is one bit set at all. */ if (!a || !a->data) return 1; /* * Check each byte of the internal representation of the bit string. */ ok = 1; for (i = 0; i < a->length && ok; ++i) { unsigned char mask = i < flags_len ? ~flags[i] : 0xff; /* We are done if there is an unneeded bit set. */ ok = (a->data[i] & mask) == 0; } return ok; }