diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/asn1/a_d2i_fp.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/asn1/a_d2i_fp.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/asn1/a_d2i_fp.c b/openssl-1.1.0h/crypto/asn1/a_d2i_fp.c new file mode 100644 index 0000000..e5c1d0e --- /dev/null +++ b/openssl-1.1.0h/crypto/asn1/a_d2i_fp.c @@ -0,0 +1,235 @@ +/* + * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include <stdio.h> +#include <limits.h> +#include "internal/cryptlib.h" +#include "internal/numbers.h" +#include <openssl/buffer.h> +#include <openssl/asn1.h> + +static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb); + +#ifndef NO_OLD_ASN1 +# ifndef OPENSSL_NO_STDIO + +void *ASN1_d2i_fp(void *(*xnew) (void), d2i_of_void *d2i, FILE *in, void **x) +{ + BIO *b; + void *ret; + + if ((b = BIO_new(BIO_s_file())) == NULL) { + ASN1err(ASN1_F_ASN1_D2I_FP, ERR_R_BUF_LIB); + return (NULL); + } + BIO_set_fp(b, in, BIO_NOCLOSE); + ret = ASN1_d2i_bio(xnew, d2i, b, x); + BIO_free(b); + return (ret); +} +# endif + +void *ASN1_d2i_bio(void *(*xnew) (void), d2i_of_void *d2i, BIO *in, void **x) +{ + BUF_MEM *b = NULL; + const unsigned char *p; + void *ret = NULL; + int len; + + len = asn1_d2i_read_bio(in, &b); + if (len < 0) + goto err; + + p = (unsigned char *)b->data; + ret = d2i(x, &p, len); + err: + BUF_MEM_free(b); + return (ret); +} + +#endif + +void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x) +{ + BUF_MEM *b = NULL; + const unsigned char *p; + void *ret = NULL; + int len; + + len = asn1_d2i_read_bio(in, &b); + if (len < 0) + goto err; + + p = (const unsigned char *)b->data; + ret = ASN1_item_d2i(x, &p, len, it); + err: + BUF_MEM_free(b); + return (ret); +} + +#ifndef OPENSSL_NO_STDIO +void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x) +{ + BIO *b; + char *ret; + + if ((b = BIO_new(BIO_s_file())) == NULL) { + ASN1err(ASN1_F_ASN1_ITEM_D2I_FP, ERR_R_BUF_LIB); + return (NULL); + } + BIO_set_fp(b, in, BIO_NOCLOSE); + ret = ASN1_item_d2i_bio(it, b, x); + BIO_free(b); + return (ret); +} +#endif + +#define HEADER_SIZE 8 +#define ASN1_CHUNK_INITIAL_SIZE (16 * 1024) +static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb) +{ + BUF_MEM *b; + unsigned char *p; + int i; + size_t want = HEADER_SIZE; + uint32_t eos = 0; + size_t off = 0; + size_t len = 0; + + const unsigned char *q; + long slen; + int inf, tag, xclass; + + b = BUF_MEM_new(); + if (b == NULL) { + ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE); + return -1; + } + + ERR_clear_error(); + for (;;) { + if (want >= (len - off)) { + want -= (len - off); + + if (len + want < len || !BUF_MEM_grow_clean(b, len + want)) { + ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE); + goto err; + } + i = BIO_read(in, &(b->data[len]), want); + if ((i < 0) && ((len - off) == 0)) { + ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_NOT_ENOUGH_DATA); + goto err; + } + if (i > 0) { + if (len + i < len) { + ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG); + goto err; + } + len += i; + } + } + /* else data already loaded */ + + p = (unsigned char *)&(b->data[off]); + q = p; + inf = ASN1_get_object(&q, &slen, &tag, &xclass, len - off); + if (inf & 0x80) { + unsigned long e; + + e = ERR_GET_REASON(ERR_peek_error()); + if (e != ASN1_R_TOO_LONG) + goto err; + else + ERR_clear_error(); /* clear error */ + } + i = q - p; /* header length */ + off += i; /* end of data */ + + if (inf & 1) { + /* no data body so go round again */ + if (eos == UINT32_MAX) { + ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_HEADER_TOO_LONG); + goto err; + } + eos++; + want = HEADER_SIZE; + } else if (eos && (slen == 0) && (tag == V_ASN1_EOC)) { + /* eos value, so go back and read another header */ + eos--; + if (eos == 0) + break; + else + want = HEADER_SIZE; + } else { + /* suck in slen bytes of data */ + want = slen; + if (want > (len - off)) { + size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE; + + want -= (len - off); + if (want > INT_MAX /* BIO_read takes an int length */ || + len + want < len) { + ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG); + goto err; + } + while (want > 0) { + /* + * Read content in chunks of increasing size + * so we can return an error for EOF without + * having to allocate the entire content length + * in one go. + */ + size_t chunk = want > chunk_max ? chunk_max : want; + + if (!BUF_MEM_grow_clean(b, len + chunk)) { + ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE); + goto err; + } + want -= chunk; + while (chunk > 0) { + i = BIO_read(in, &(b->data[len]), chunk); + if (i <= 0) { + ASN1err(ASN1_F_ASN1_D2I_READ_BIO, + ASN1_R_NOT_ENOUGH_DATA); + goto err; + } + /* + * This can't overflow because |len+want| didn't + * overflow. + */ + len += i; + chunk -= i; + } + if (chunk_max < INT_MAX/2) + chunk_max *= 2; + } + } + if (off + slen < off) { + ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG); + goto err; + } + off += slen; + if (eos == 0) { + break; + } else + want = HEADER_SIZE; + } + } + + if (off > INT_MAX) { + ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG); + goto err; + } + + *pb = b; + return off; + err: + BUF_MEM_free(b); + return -1; +} |