/src/boringssl/crypto/bio/bio.cc

Source
// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <openssl/bio.h>

#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <string.h>

#include <openssl/asn1.h>
#include <openssl/err.h>
#include <openssl/mem.h>

#include "../internal.h"
#include "internal.h"


static CRYPTO_EX_DATA_CLASS g_ex_data_class =
    CRYPTO_EX_DATA_CLASS_INIT_WITH_APP_DATA;

BIO *BIO_new(const BIO_METHOD *method) {
  BIO *ret = reinterpret_cast<BIO *>(OPENSSL_zalloc(sizeof(BIO)));
  if (ret == nullptr) {
    return nullptr;
  }

  ret->method = method;
  ret->shutdown = 1;
  ret->references = 1;
  CRYPTO_new_ex_data(&ret->ex_data);

  if (method->create != nullptr && !method->create(ret)) {
    OPENSSL_free(ret);
    return nullptr;
  }

  return ret;
}

int BIO_free(BIO *bio) {
  BIO *next_bio;

  for (; bio != nullptr; bio = next_bio) {
    if (!CRYPTO_refcount_dec_and_test_zero(&bio->references)) {
      return 0;
    }

    next_bio = BIO_pop(bio);

    if (bio->method != nullptr && bio->method->destroy != nullptr) {
      bio->method->destroy(bio);
    }

    CRYPTO_free_ex_data(&g_ex_data_class, &bio->ex_data);
    OPENSSL_free(bio);
  }
  return 1;
}

int BIO_up_ref(BIO *bio) {
  CRYPTO_refcount_inc(&bio->references);
  return 1;
}

void BIO_vfree(BIO *bio) { BIO_free(bio); }

void BIO_free_all(BIO *bio) { BIO_free(bio); }

int BIO_read(BIO *bio, void *buf, int len) {
  if (bio == nullptr || bio->method == nullptr ||
      bio->method->bread == nullptr) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
    return -2;
  }
  if (!bio->init) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
    return -2;
  }
  if (len <= 0) {
    return 0;
  }
  int ret = bio->method->bread(bio, reinterpret_cast<char *>(buf), len);
  if (ret > 0) {
    bio->num_read += ret;
  }
  return ret;
}

int BIO_gets(BIO *bio, char *buf, int len) {
  if (bio == nullptr || bio->method == nullptr ||
      bio->method->bgets == nullptr) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
    return -2;
  }
  if (!bio->init) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
    return -2;
  }
  if (len <= 0) {
    return 0;
  }
  int ret = bio->method->bgets(bio, buf, len);
  if (ret > 0) {
    bio->num_read += ret;
  }
  return ret;
}

int BIO_write(BIO *bio, const void *in, int inl) {
  if (bio == nullptr || bio->method == nullptr ||
      bio->method->bwrite == nullptr) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
    return -2;
  }
  if (!bio->init) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
    return -2;
  }
  if (inl <= 0) {
    return 0;
  }
  int ret = bio->method->bwrite(bio, reinterpret_cast<const char *>(in), inl);
  if (ret > 0) {
    bio->num_write += ret;
  }
  return ret;
}

int BIO_write_all(BIO *bio, const void *data, size_t len) {
  const uint8_t *data_u8 = reinterpret_cast<const uint8_t *>(data);
  while (len > 0) {
    int ret = BIO_write(bio, data_u8, len > INT_MAX ? INT_MAX : (int)len);
    if (ret <= 0) {
      return 0;
    }
    data_u8 += ret;
    len -= ret;
  }
  return 1;
}

int BIO_puts(BIO *bio, const char *in) {
  size_t len = strlen(in);
  if (len > INT_MAX) {
    // |BIO_write| and the return value both assume the string fits in |int|.
    OPENSSL_PUT_ERROR(BIO, ERR_R_OVERFLOW);
    return -1;
  }
  return BIO_write(bio, in, (int)len);
}

int BIO_flush(BIO *bio) {
  return (int)BIO_ctrl(bio, BIO_CTRL_FLUSH, 0, nullptr);
}

long BIO_ctrl(BIO *bio, int cmd, long larg, void *parg) {
  if (bio == nullptr) {
    return 0;
  }

  if (bio->method == nullptr || bio->method->ctrl == nullptr) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
    return -2;
  }

  return bio->method->ctrl(bio, cmd, larg, parg);
}

char *BIO_ptr_ctrl(BIO *b, int cmd, long larg) {
  char *p = nullptr;

  if (BIO_ctrl(b, cmd, larg, (void *)&p) <= 0) {
    return nullptr;
  }

  return p;
}

long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg) {
  int i = iarg;

  return BIO_ctrl(b, cmd, larg, (void *)&i);
}

int BIO_reset(BIO *bio) {
  return (int)BIO_ctrl(bio, BIO_CTRL_RESET, 0, nullptr);
}

int BIO_eof(BIO *bio) { return (int)BIO_ctrl(bio, BIO_CTRL_EOF, 0, nullptr); }

void BIO_set_flags(BIO *bio, int flags) { bio->flags |= flags; }

int BIO_test_flags(const BIO *bio, int flags) { return bio->flags & flags; }

int BIO_should_read(const BIO *bio) {
  return BIO_test_flags(bio, BIO_FLAGS_READ);
}

int BIO_should_write(const BIO *bio) {
  return BIO_test_flags(bio, BIO_FLAGS_WRITE);
}

int BIO_should_retry(const BIO *bio) {
  return BIO_test_flags(bio, BIO_FLAGS_SHOULD_RETRY);
}

int BIO_should_io_special(const BIO *bio) {
  return BIO_test_flags(bio, BIO_FLAGS_IO_SPECIAL);
}

int BIO_get_retry_reason(const BIO *bio) { return bio->retry_reason; }

void BIO_set_retry_reason(BIO *bio, int reason) { bio->retry_reason = reason; }

void BIO_clear_flags(BIO *bio, int flags) { bio->flags &= ~flags; }

void BIO_set_retry_read(BIO *bio) {
  bio->flags |= BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY;
}

void BIO_set_retry_write(BIO *bio) {
  bio->flags |= BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY;
}

static const int kRetryFlags = BIO_FLAGS_RWS | BIO_FLAGS_SHOULD_RETRY;

int BIO_get_retry_flags(BIO *bio) { return bio->flags & kRetryFlags; }

void BIO_clear_retry_flags(BIO *bio) {
  bio->flags &= ~kRetryFlags;
  bio->retry_reason = 0;
}

int BIO_method_type(const BIO *bio) { return bio->method->type; }

void BIO_copy_next_retry(BIO *bio) {
  BIO_clear_retry_flags(bio);
  BIO_set_flags(bio, BIO_get_retry_flags(bio->next_bio));
  bio->retry_reason = bio->next_bio->retry_reason;
}

long BIO_callback_ctrl(BIO *bio, int cmd, BIO_info_cb *fp) {
  if (bio == nullptr) {
    return 0;
  }

  if (bio->method == nullptr || bio->method->callback_ctrl == nullptr) {
    OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
    return 0;
  }

  return bio->method->callback_ctrl(bio, cmd, fp);
}

size_t BIO_pending(const BIO *bio) {
  const long r = BIO_ctrl((BIO *)bio, BIO_CTRL_PENDING, 0, nullptr);
  assert(r >= 0);

  if (r < 0) {
    return 0;
  }
  return r;
}

size_t BIO_ctrl_pending(const BIO *bio) { return BIO_pending(bio); }

size_t BIO_wpending(const BIO *bio) {
  const long r = BIO_ctrl((BIO *)bio, BIO_CTRL_WPENDING, 0, nullptr);
  assert(r >= 0);

  if (r < 0) {
    return 0;
  }
  return r;
}

int BIO_set_close(BIO *bio, int close_flag) {
  return (int)BIO_ctrl(bio, BIO_CTRL_SET_CLOSE, close_flag, nullptr);
}

OPENSSL_EXPORT uint64_t BIO_number_read(const BIO *bio) {
  return bio->num_read;
}

OPENSSL_EXPORT uint64_t BIO_number_written(const BIO *bio) {
  return bio->num_write;
}

BIO *BIO_push(BIO *bio, BIO *appended_bio) {
  BIO *last_bio;

  if (bio == nullptr) {
    return bio;
  }

  last_bio = bio;
  while (last_bio->next_bio != nullptr) {
    last_bio = last_bio->next_bio;
  }

  last_bio->next_bio = appended_bio;
  return bio;
}

BIO *BIO_pop(BIO *bio) {
  BIO *ret;

  if (bio == nullptr) {
    return nullptr;
  }
  ret = bio->next_bio;
  bio->next_bio = nullptr;
  return ret;
}

BIO *BIO_next(BIO *bio) {
  if (!bio) {
    return nullptr;
  }
  return bio->next_bio;
}

BIO *BIO_find_type(BIO *bio, int type) {
  int method_type, mask;

  if (!bio) {
    return nullptr;
  }
  mask = type & 0xff;

  do {
    if (bio->method != nullptr) {
      method_type = bio->method->type;

      if (!mask) {
        if (method_type & type) {
          return bio;
        }
      } else if (method_type == type) {
        return bio;
      }
    }
    bio = bio->next_bio;
  } while (bio != nullptr);

  return nullptr;
}

int BIO_indent(BIO *bio, unsigned indent, unsigned max_indent) {
  if (indent > max_indent) {
    indent = max_indent;
  }

  while (indent--) {
    if (BIO_puts(bio, " ") != 1) {
      return 0;
    }
  }
  return 1;
}

static int print_bio(const char *str, size_t len, void *bio) {
  return BIO_write_all((BIO *)bio, str, len);
}

void ERR_print_errors(BIO *bio) { ERR_print_errors_cb(print_bio, bio); }

// bio_read_all reads everything from |bio| and prepends |prefix| to it. On
// success, |*out| is set to an allocated buffer (which should be freed with
// |OPENSSL_free|), |*out_len| is set to its length and one is returned. The
// buffer will contain |prefix| followed by the contents of |bio|. On failure,
// zero is returned.
//
// The function will fail if the size of the output would equal or exceed
// |max_len|.
static int bio_read_all(BIO *bio, uint8_t **out, size_t *out_len,
                        const uint8_t *prefix, size_t prefix_len,
                        size_t max_len) {
  static const size_t kChunkSize = 4096;

  size_t len = prefix_len + kChunkSize;
  if (len > max_len) {
    len = max_len;
  }
  if (len < prefix_len) {
    return 0;
  }
  *out = reinterpret_cast<uint8_t *>(OPENSSL_malloc(len));
  if (*out == nullptr) {
    return 0;
  }
  OPENSSL_memcpy(*out, prefix, prefix_len);
  size_t done = prefix_len;

  for (;;) {
    if (done == len) {
      OPENSSL_free(*out);
      return 0;
    }
    size_t todo = len - done;
    if (todo > INT_MAX) {
      todo = INT_MAX;
    }
    const int n = BIO_read(bio, *out + done, (int)todo);
    if (n == 0) {
      *out_len = done;
      return 1;
    } else if (n == -1) {
      OPENSSL_free(*out);
      return 0;
    }

    done += n;
    if (len < max_len && len - done < kChunkSize / 2) {
      len += kChunkSize;
      if (len < kChunkSize || len > max_len) {
        len = max_len;
      }
      uint8_t *new_buf =
          reinterpret_cast<uint8_t *>(OPENSSL_realloc(*out, len));
      if (new_buf == nullptr) {
        OPENSSL_free(*out);
        return 0;
      }
      *out = new_buf;
    }
  }
}

// bio_read_full reads |len| bytes |bio| and writes them into |out|. It
// tolerates partial reads from |bio| and returns one on success or zero if a
// read fails before |len| bytes are read. On failure, it additionally sets
// |*out_eof_on_first_read| to whether the error was due to |bio| returning zero
// on the first read. |out_eof_on_first_read| may be NULL to discard the value.
static int bio_read_full(BIO *bio, uint8_t *out, int *out_eof_on_first_read,
                         size_t len) {
  int first_read = 1;
  while (len > 0) {
    int todo = len <= INT_MAX ? (int)len : INT_MAX;
    int ret = BIO_read(bio, out, todo);
    if (ret <= 0) {
      if (out_eof_on_first_read != nullptr) {
        *out_eof_on_first_read = first_read && ret == 0;
      }
      return 0;
    }
    out += ret;
    len -= (size_t)ret;
    first_read = 0;
  }

  return 1;
}

// For compatibility with existing |d2i_*_bio| callers, |BIO_read_asn1| uses
// |ERR_LIB_ASN1| errors.
OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_DECODE_ERROR)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_HEADER_TOO_LONG)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_NOT_ENOUGH_DATA)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_TOO_LONG)

int BIO_read_asn1(BIO *bio, uint8_t **out, size_t *out_len, size_t max_len) {
  uint8_t header[6];

  static const size_t kInitialHeaderLen = 2;
  int eof_on_first_read;
  if (!bio_read_full(bio, header, &eof_on_first_read, kInitialHeaderLen)) {
    if (eof_on_first_read) {
      // Historically, OpenSSL returned |ASN1_R_HEADER_TOO_LONG| when
      // |d2i_*_bio| could not read anything. CPython conditions on this to
      // determine if |bio| was empty.
      OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
    } else {
      OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
    }
    return 0;
  }

  const uint8_t tag = header[0];
  const uint8_t length_byte = header[1];

  if ((tag & 0x1f) == 0x1f) {
    // Long form tags are not supported.
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
    return 0;
  }

  size_t len, header_len;
  if ((length_byte & 0x80) == 0) {
    // Short form length.
    len = length_byte;
    header_len = kInitialHeaderLen;
  } else {
    const size_t num_bytes = length_byte & 0x7f;

    if ((tag & 0x20 /* constructed */) != 0 && num_bytes == 0) {
      // indefinite length.
      if (!bio_read_all(bio, out, out_len, header, kInitialHeaderLen,
                        max_len)) {
        OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
        return 0;
      }
      return 1;
    }

    if (num_bytes == 0 || num_bytes > 4) {
      OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
      return 0;
    }

    if (!bio_read_full(bio, header + kInitialHeaderLen, nullptr, num_bytes)) {
      OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
      return 0;
    }
    header_len = kInitialHeaderLen + num_bytes;

    uint32_t len32 = 0;
    for (unsigned i = 0; i < num_bytes; i++) {
      len32 <<= 8;
      len32 |= header[kInitialHeaderLen + i];
    }

    if (len32 < 128) {
      // Length should have used short-form encoding.
      OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
      return 0;
    }

    if ((len32 >> ((num_bytes - 1) * 8)) == 0) {
      // Length should have been at least one byte shorter.
      OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
      return 0;
    }

    len = len32;
  }

  if (len + header_len < len || len + header_len > max_len || len > INT_MAX) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
    return 0;
  }
  len += header_len;
  *out_len = len;

  *out = reinterpret_cast<uint8_t *>(OPENSSL_malloc(len));
  if (*out == nullptr) {
    return 0;
  }
  OPENSSL_memcpy(*out, header, header_len);
  if (!bio_read_full(bio, (*out) + header_len, nullptr, len - header_len)) {
    OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
    OPENSSL_free(*out);
    return 0;
  }

  return 1;
}

void BIO_set_retry_special(BIO *bio) {
  bio->flags |= BIO_FLAGS_READ | BIO_FLAGS_IO_SPECIAL;
}

int BIO_set_write_buffer_size(BIO *bio, int buffer_size) { return 0; }

static CRYPTO_MUTEX g_index_lock = CRYPTO_MUTEX_INIT;
static int g_index = BIO_TYPE_START;

int BIO_get_new_index(void) {
  CRYPTO_MUTEX_lock_write(&g_index_lock);
  // If |g_index| exceeds 255, it will collide with the flags bits.
  int ret = g_index > 255 ? -1 : g_index++;
  CRYPTO_MUTEX_unlock_write(&g_index_lock);
  return ret;
}

BIO_METHOD *BIO_meth_new(int type, const char *name) {
  BIO_METHOD *method =
      reinterpret_cast<BIO_METHOD *>(OPENSSL_zalloc(sizeof(BIO_METHOD)));
  if (method == nullptr) {
    return nullptr;
  }
  method->type = type;
  method->name = name;
  return method;
}

void BIO_meth_free(BIO_METHOD *method) { OPENSSL_free(method); }

int BIO_meth_set_create(BIO_METHOD *method, int (*create_func)(BIO *)) {
  method->create = create_func;
  return 1;
}

int BIO_meth_set_destroy(BIO_METHOD *method, int (*destroy_func)(BIO *)) {
  method->destroy = destroy_func;
  return 1;
}

int BIO_meth_set_write(BIO_METHOD *method,
                       int (*write_func)(BIO *, const char *, int)) {
  method->bwrite = write_func;
  return 1;
}

int BIO_meth_set_read(BIO_METHOD *method,
                      int (*read_func)(BIO *, char *, int)) {
  method->bread = read_func;
  return 1;
}

int BIO_meth_set_gets(BIO_METHOD *method,
                      int (*gets_func)(BIO *, char *, int)) {
  method->bgets = gets_func;
  return 1;
}

int BIO_meth_set_ctrl(BIO_METHOD *method,
                      long (*ctrl_func)(BIO *, int, long, void *)) {
  method->ctrl = ctrl_func;
  return 1;
}

int BIO_meth_set_callback_ctrl(BIO_METHOD *method,
                               long (*callback_ctrl_func)(BIO *, int,
                                                          BIO_info_cb *)) {
  method->callback_ctrl = callback_ctrl_func;
  return 1;
}

void BIO_set_data(BIO *bio, void *ptr) { bio->ptr = ptr; }

void *BIO_get_data(BIO *bio) { return bio->ptr; }

void BIO_set_init(BIO *bio, int init) { bio->init = init; }

int BIO_get_init(BIO *bio) { return bio->init; }

void BIO_set_shutdown(BIO *bio, int shutdown) { bio->shutdown = shutdown; }

int BIO_get_shutdown(BIO *bio) { return bio->shutdown; }

int BIO_meth_set_puts(BIO_METHOD *method, int (*puts)(BIO *, const char *)) {
  // Ignore the parameter. We implement |BIO_puts| using |BIO_write|.
  return 1;
}

int BIO_get_ex_new_index(long argl, void *argp,      //
                         CRYPTO_EX_unused *unused,   //
                         CRYPTO_EX_dup *dup_unused,  //
                         CRYPTO_EX_free *free_func) {
  return CRYPTO_get_ex_new_index_ex(&g_ex_data_class, argl, argp, free_func);
}

int BIO_set_ex_data(BIO *bio, int idx, void *data) {
  return CRYPTO_set_ex_data(&bio->ex_data, idx, data);
}

void *BIO_get_ex_data(const BIO *bio, int idx) {
  return CRYPTO_get_ex_data(&bio->ex_data, idx);
}

Coverage Report

Created: 2025-11-03 06:30

Line	Count	Source
1		// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
2		//
3		// Licensed under the Apache License, Version 2.0 (the "License");
4		// you may not use this file except in compliance with the License.
5		// You may obtain a copy of the License at
6		//
7		// https://www.apache.org/licenses/LICENSE-2.0
8		//
9		// Unless required by applicable law or agreed to in writing, software
10		// distributed under the License is distributed on an "AS IS" BASIS,
11		// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12		// See the License for the specific language governing permissions and
13		// limitations under the License.
14
15		#include <openssl/bio.h>
16
17		#include <assert.h>
18		#include <errno.h>
19		#include <limits.h>
20		#include <string.h>
21
22		#include <openssl/asn1.h>
23		#include <openssl/err.h>
24		#include <openssl/mem.h>
25
26		#include "../internal.h"
27		#include "internal.h"
28
29
30		static CRYPTO_EX_DATA_CLASS g_ex_data_class =
31		CRYPTO_EX_DATA_CLASS_INIT_WITH_APP_DATA;
32
33	79.3k	BIO BIO_new(const BIO_METHOD method) {
34	79.3k	BIO ret = reinterpret_cast<BIO >(OPENSSL_zalloc(sizeof(BIO)));
35	79.3k	if (ret == nullptr) {
36	0	return nullptr;
37	0	}
38
39	79.3k	ret->method = method;
40	79.3k	ret->shutdown = 1;
41	79.3k	ret->references = 1;
42	79.3k	CRYPTO_new_ex_data(&ret->ex_data);
43
44	79.3k	if (method->create != nullptr && !method->create(ret)) {
45	0	OPENSSL_free(ret);
46	0	return nullptr;
47	0	}
48
49	79.3k	return ret;
50	79.3k	}
51
52	79.3k	int BIO_free(BIO *bio) {
53	79.3k	BIO *next_bio;
54
55	158k	for (; bio != nullptr; bio = next_bio) {
56	79.3k	if (!CRYPTO_refcount_dec_and_test_zero(&bio->references)) {
57	16	return 0;
58	16	}
59
60	79.3k	next_bio = BIO_pop(bio);
61
62	79.3k	if (bio->method != nullptr && bio->method->destroy != nullptr) {
63	79.3k	bio->method->destroy(bio);
64	79.3k	}
65
66	79.3k	CRYPTO_free_ex_data(&g_ex_data_class, &bio->ex_data);
67	79.3k	OPENSSL_free(bio);
68	79.3k	}
69	79.3k	return 1;
70	79.3k	}
71
72	16	int BIO_up_ref(BIO *bio) {
73	16	CRYPTO_refcount_inc(&bio->references);
74	16	return 1;
75	16	}
76
77	0	void BIO_vfree(BIO *bio) { BIO_free(bio); }
78
79	0	void BIO_free_all(BIO *bio) { BIO_free(bio); }
80
81	1.44M	int BIO_read(BIO bio, void buf, int len) {
82	1.44M	if (bio == nullptr \|\| bio->method == nullptr \|\|
83	1.44M	bio->method->bread == nullptr) {
84	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
85	0	return -2;
86	0	}
87	1.44M	if (!bio->init) {
88	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
89	0	return -2;
90	0	}
91	1.44M	if (len <= 0) {
92	0	return 0;
93	0	}
94	1.44M	int ret = bio->method->bread(bio, reinterpret_cast<char *>(buf), len);
95	1.44M	if (ret > 0) {
96	1.43M	bio->num_read += ret;
97	1.43M	}
98	1.44M	return ret;
99	1.44M	}
100
101	298k	int BIO_gets(BIO bio, char buf, int len) {
102	298k	if (bio == nullptr \|\| bio->method == nullptr \|\|
103	298k	bio->method->bgets == nullptr) {
104	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
105	0	return -2;
106	0	}
107	298k	if (!bio->init) {
108	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
109	0	return -2;
110	0	}
111	298k	if (len <= 0) {
112	0	return 0;
113	0	}
114	298k	int ret = bio->method->bgets(bio, buf, len);
115	298k	if (ret > 0) {
116	273k	bio->num_read += ret;
117	273k	}
118	298k	return ret;
119	298k	}
120
121	1.00M	int BIO_write(BIO bio, const void in, int inl) {
122	1.00M	if (bio == nullptr \|\| bio->method == nullptr \|\|
123	1.00M	bio->method->bwrite == nullptr) {
124	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
125	0	return -2;
126	0	}
127	1.00M	if (!bio->init) {
128	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNINITIALIZED);
129	0	return -2;
130	0	}
131	1.00M	if (inl <= 0) {
132	30	return 0;
133	30	}
134	1.00M	int ret = bio->method->bwrite(bio, reinterpret_cast<const char *>(in), inl);
135	1.00M	if (ret > 0) {
136	1.00M	bio->num_write += ret;
137	1.00M	}
138	1.00M	return ret;
139	1.00M	}
140
141	7.64k	int BIO_write_all(BIO bio, const void data, size_t len) {
142	7.64k	const uint8_t data_u8 = reinterpret_cast<const uint8_t >(data);
143	15.2k	while (len > 0) {
144	7.64k	int ret = BIO_write(bio, data_u8, len > INT_MAX ? INT_MAX : (int)len);
145	7.64k	if (ret <= 0) {
146	0	return 0;
147	0	}
148	7.64k	data_u8 += ret;
149	7.64k	len -= ret;
150	7.64k	}
151	7.64k	return 1;
152	7.64k	}
153
154	237k	int BIO_puts(BIO bio, const char in) {
155	237k	size_t len = strlen(in);
156	237k	if (len > INT_MAX) {
157		// \|BIO_write\| and the return value both assume the string fits in \|int\|.
158	0	OPENSSL_PUT_ERROR(BIO, ERR_R_OVERFLOW);
159	0	return -1;
160	0	}
161	237k	return BIO_write(bio, in, (int)len);
162	237k	}
163
164	157k	int BIO_flush(BIO *bio) {
165	157k	return (int)BIO_ctrl(bio, BIO_CTRL_FLUSH, 0, nullptr);
166	157k	}
167
168	176k	long BIO_ctrl(BIO bio, int cmd, long larg, void parg) {
169	176k	if (bio == nullptr) {
170	0	return 0;
171	0	}
172
173	176k	if (bio->method == nullptr \|\| bio->method->ctrl == nullptr) {
174	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
175	0	return -2;
176	0	}
177
178	176k	return bio->method->ctrl(bio, cmd, larg, parg);
179	176k	}
180
181	0	char BIO_ptr_ctrl(BIO b, int cmd, long larg) {
182	0	char *p = nullptr;
183
184	0	if (BIO_ctrl(b, cmd, larg, (void *)&p) <= 0) {
185	0	return nullptr;
186	0	}
187
188	0	return p;
189	0	}
190
191	0	long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg) {
192	0	int i = iarg;
193
194	0	return BIO_ctrl(b, cmd, larg, (void *)&i);
195	0	}
196
197	0	int BIO_reset(BIO *bio) {
198	0	return (int)BIO_ctrl(bio, BIO_CTRL_RESET, 0, nullptr);
199	0	}
200
201	0	int BIO_eof(BIO *bio) { return (int)BIO_ctrl(bio, BIO_CTRL_EOF, 0, nullptr); }
202
203	0	void BIO_set_flags(BIO *bio, int flags) { bio->flags \|= flags; }
204
205	24.2k	int BIO_test_flags(const BIO *bio, int flags) { return bio->flags & flags; }
206
207	8.08k	int BIO_should_read(const BIO *bio) {
208	8.08k	return BIO_test_flags(bio, BIO_FLAGS_READ);
209	8.08k	}
210
211	8.08k	int BIO_should_write(const BIO *bio) {
212	8.08k	return BIO_test_flags(bio, BIO_FLAGS_WRITE);
213	8.08k	}
214
215	0	int BIO_should_retry(const BIO *bio) {
216	0	return BIO_test_flags(bio, BIO_FLAGS_SHOULD_RETRY);
217	0	}
218
219	8.08k	int BIO_should_io_special(const BIO *bio) {
220	8.08k	return BIO_test_flags(bio, BIO_FLAGS_IO_SPECIAL);
221	8.08k	}
222
223	0	int BIO_get_retry_reason(const BIO *bio) { return bio->retry_reason; }
224
225	0	void BIO_set_retry_reason(BIO *bio, int reason) { bio->retry_reason = reason; }
226
227	0	void BIO_clear_flags(BIO *bio, int flags) { bio->flags &= ~flags; }
228
229	0	void BIO_set_retry_read(BIO *bio) {
230	0	bio->flags \|= BIO_FLAGS_READ \| BIO_FLAGS_SHOULD_RETRY;
231	0	}
232
233	0	void BIO_set_retry_write(BIO *bio) {
234	0	bio->flags \|= BIO_FLAGS_WRITE \| BIO_FLAGS_SHOULD_RETRY;
235	0	}
236
237		static const int kRetryFlags = BIO_FLAGS_RWS \| BIO_FLAGS_SHOULD_RETRY;
238
239	0	int BIO_get_retry_flags(BIO *bio) { return bio->flags & kRetryFlags; }
240
241	1.60M	void BIO_clear_retry_flags(BIO *bio) {
242	1.60M	bio->flags &= ~kRetryFlags;
243	1.60M	bio->retry_reason = 0;
244	1.60M	}
245
246	0	int BIO_method_type(const BIO *bio) { return bio->method->type; }
247
248	0	void BIO_copy_next_retry(BIO *bio) {
249	0	BIO_clear_retry_flags(bio);
250	0	BIO_set_flags(bio, BIO_get_retry_flags(bio->next_bio));
251	0	bio->retry_reason = bio->next_bio->retry_reason;
252	0	}
253
254	0	long BIO_callback_ctrl(BIO bio, int cmd, BIO_info_cb fp) {
255	0	if (bio == nullptr) {
256	0	return 0;
257	0	}
258
259	0	if (bio->method == nullptr \|\| bio->method->callback_ctrl == nullptr) {
260	0	OPENSSL_PUT_ERROR(BIO, BIO_R_UNSUPPORTED_METHOD);
261	0	return 0;
262	0	}
263
264	0	return bio->method->callback_ctrl(bio, cmd, fp);
265	0	}
266
267	0	size_t BIO_pending(const BIO *bio) {
268	0	const long r = BIO_ctrl((BIO *)bio, BIO_CTRL_PENDING, 0, nullptr);
269	0	assert(r >= 0);
270
271	0	if (r < 0) {
272	0	return 0;
273	0	}
274	0	return r;
275	0	}
276
277	0	size_t BIO_ctrl_pending(const BIO *bio) { return BIO_pending(bio); }
278
279	0	size_t BIO_wpending(const BIO *bio) {
280	0	const long r = BIO_ctrl((BIO *)bio, BIO_CTRL_WPENDING, 0, nullptr);
281	0	assert(r >= 0);
282
283	0	if (r < 0) {
284	0	return 0;
285	0	}
286	0	return r;
287	0	}
288
289	0	int BIO_set_close(BIO *bio, int close_flag) {
290	0	return (int)BIO_ctrl(bio, BIO_CTRL_SET_CLOSE, close_flag, nullptr);
291	0	}
292
293	0	OPENSSL_EXPORT uint64_t BIO_number_read(const BIO *bio) {
294	0	return bio->num_read;
295	0	}
296
297	0	OPENSSL_EXPORT uint64_t BIO_number_written(const BIO *bio) {
298	0	return bio->num_write;
299	0	}
300
301	0	BIO BIO_push(BIO bio, BIO *appended_bio) {
302	0	BIO *last_bio;
303
304	0	if (bio == nullptr) {
305	0	return bio;
306	0	}
307
308	0	last_bio = bio;
309	0	while (last_bio->next_bio != nullptr) {
310	0	last_bio = last_bio->next_bio;
311	0	}
312
313	0	last_bio->next_bio = appended_bio;
314	0	return bio;
315	0	}
316
317	79.3k	BIO BIO_pop(BIO bio) {
318	79.3k	BIO *ret;
319
320	79.3k	if (bio == nullptr) {
321	0	return nullptr;
322	0	}
323	79.3k	ret = bio->next_bio;
324	79.3k	bio->next_bio = nullptr;
325	79.3k	return ret;
326	79.3k	}
327
328	0	BIO BIO_next(BIO bio) {
329	0	if (!bio) {
330	0	return nullptr;
331	0	}
332	0	return bio->next_bio;
333	0	}
334
335	0	BIO BIO_find_type(BIO bio, int type) {
336	0	int method_type, mask;
337
338	0	if (!bio) {
339	0	return nullptr;
340	0	}
341	0	mask = type & 0xff;
342
343	0	do {
344	0	if (bio->method != nullptr) {
345	0	method_type = bio->method->type;
346
347	0	if (!mask) {
348	0	if (method_type & type) {
349	0	return bio;
350	0	}
351	0	} else if (method_type == type) {
352	0	return bio;
353	0	}
354	0	}
355	0	bio = bio->next_bio;
356	0	} while (bio != nullptr);
357
358	0	return nullptr;
359	0	}
360
361	29.5k	int BIO_indent(BIO *bio, unsigned indent, unsigned max_indent) {
362	29.5k	if (indent > max_indent) {
363	0	indent = max_indent;
364	0	}
365
366	231k	while (indent--) {
367	202k	if (BIO_puts(bio, " ") != 1) {
368	0	return 0;
369	0	}
370	202k	}
371	29.5k	return 1;
372	29.5k	}
373
374	7.64k	static int print_bio(const char str, size_t len, void bio) {
375	7.64k	return BIO_write_all((BIO *)bio, str, len);
376	7.64k	}
377
378	2.23k	void ERR_print_errors(BIO *bio) { ERR_print_errors_cb(print_bio, bio); }
379
380		// bio_read_all reads everything from \|bio\| and prepends \|prefix\| to it. On
381		// success, \|*out\| is set to an allocated buffer (which should be freed with
382		// \|OPENSSL_free\|), \|*out_len\| is set to its length and one is returned. The
383		// buffer will contain \|prefix\| followed by the contents of \|bio\|. On failure,
384		// zero is returned.
385		//
386		// The function will fail if the size of the output would equal or exceed
387		// \|max_len\|.
388		static int bio_read_all(BIO bio, uint8_t out, size_t out_len,
389		const uint8_t *prefix, size_t prefix_len,
390	0	size_t max_len) {
391	0	static const size_t kChunkSize = 4096;
392
393	0	size_t len = prefix_len + kChunkSize;
394	0	if (len > max_len) {
395	0	len = max_len;
396	0	}
397	0	if (len < prefix_len) {
398	0	return 0;
399	0	}
400	0	out = reinterpret_cast<uint8_t >(OPENSSL_malloc(len));
401	0	if (*out == nullptr) {
402	0	return 0;
403	0	}
404	0	OPENSSL_memcpy(*out, prefix, prefix_len);
405	0	size_t done = prefix_len;
406
407	0	for (;;) {
408	0	if (done == len) {
409	0	OPENSSL_free(*out);
410	0	return 0;
411	0	}
412	0	size_t todo = len - done;
413	0	if (todo > INT_MAX) {
414	0	todo = INT_MAX;
415	0	}
416	0	const int n = BIO_read(bio, *out + done, (int)todo);
417	0	if (n == 0) {
418	0	*out_len = done;
419	0	return 1;
420	0	} else if (n == -1) {
421	0	OPENSSL_free(*out);
422	0	return 0;
423	0	}
424
425	0	done += n;
426	0	if (len < max_len && len - done < kChunkSize / 2) {
427	0	len += kChunkSize;
428	0	if (len < kChunkSize \|\| len > max_len) {
429	0	len = max_len;
430	0	}
431	0	uint8_t *new_buf =
432	0	reinterpret_cast<uint8_t >(OPENSSL_realloc(out, len));
433	0	if (new_buf == nullptr) {
434	0	OPENSSL_free(*out);
435	0	return 0;
436	0	}
437	0	*out = new_buf;
438	0	}
439	0	}
440	0	}
441
442		// bio_read_full reads \|len\| bytes \|bio\| and writes them into \|out\|. It
443		// tolerates partial reads from \|bio\| and returns one on success or zero if a
444		// read fails before \|len\| bytes are read. On failure, it additionally sets
445		// \|*out_eof_on_first_read\| to whether the error was due to \|bio\| returning zero
446		// on the first read. \|out_eof_on_first_read\| may be NULL to discard the value.
447		static int bio_read_full(BIO bio, uint8_t out, int *out_eof_on_first_read,
448	0	size_t len) {
449	0	int first_read = 1;
450	0	while (len > 0) {
451	0	int todo = len <= INT_MAX ? (int)len : INT_MAX;
452	0	int ret = BIO_read(bio, out, todo);
453	0	if (ret <= 0) {
454	0	if (out_eof_on_first_read != nullptr) {
455	0	*out_eof_on_first_read = first_read && ret == 0;
456	0	}
457	0	return 0;
458	0	}
459	0	out += ret;
460	0	len -= (size_t)ret;
461	0	first_read = 0;
462	0	}
463
464	0	return 1;
465	0	}
466
467		// For compatibility with existing \|d2i_*_bio\| callers, \|BIO_read_asn1\| uses
468		// \|ERR_LIB_ASN1\| errors.
469		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_DECODE_ERROR)
470		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_HEADER_TOO_LONG)
471		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_NOT_ENOUGH_DATA)
472		OPENSSL_DECLARE_ERROR_REASON(ASN1, ASN1_R_TOO_LONG)
473
474	0	int BIO_read_asn1(BIO bio, uint8_t out, size_t out_len, size_t max_len) {
475	0	uint8_t header[6];
476
477	0	static const size_t kInitialHeaderLen = 2;
478	0	int eof_on_first_read;
479	0	if (!bio_read_full(bio, header, &eof_on_first_read, kInitialHeaderLen)) {
480	0	if (eof_on_first_read) {
481		// Historically, OpenSSL returned \|ASN1_R_HEADER_TOO_LONG\| when
482		// \|d2i_*_bio\| could not read anything. CPython conditions on this to
483		// determine if \|bio\| was empty.
484	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
485	0	} else {
486	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
487	0	}
488	0	return 0;
489	0	}
490
491	0	const uint8_t tag = header[0];
492	0	const uint8_t length_byte = header[1];
493
494	0	if ((tag & 0x1f) == 0x1f) {
495		// Long form tags are not supported.
496	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
497	0	return 0;
498	0	}
499
500	0	size_t len, header_len;
501	0	if ((length_byte & 0x80) == 0) {
502		// Short form length.
503	0	len = length_byte;
504	0	header_len = kInitialHeaderLen;
505	0	} else {
506	0	const size_t num_bytes = length_byte & 0x7f;
507
508	0	if ((tag & 0x20 /* constructed */) != 0 && num_bytes == 0) {
509		// indefinite length.
510	0	if (!bio_read_all(bio, out, out_len, header, kInitialHeaderLen,
511	0	max_len)) {
512	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
513	0	return 0;
514	0	}
515	0	return 1;
516	0	}
517
518	0	if (num_bytes == 0 \|\| num_bytes > 4) {
519	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
520	0	return 0;
521	0	}
522
523	0	if (!bio_read_full(bio, header + kInitialHeaderLen, nullptr, num_bytes)) {
524	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
525	0	return 0;
526	0	}
527	0	header_len = kInitialHeaderLen + num_bytes;
528
529	0	uint32_t len32 = 0;
530	0	for (unsigned i = 0; i < num_bytes; i++) {
531	0	len32 <<= 8;
532	0	len32 \|= header[kInitialHeaderLen + i];
533	0	}
534
535	0	if (len32 < 128) {
536		// Length should have used short-form encoding.
537	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
538	0	return 0;
539	0	}
540
541	0	if ((len32 >> ((num_bytes - 1) * 8)) == 0) {
542		// Length should have been at least one byte shorter.
543	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_DECODE_ERROR);
544	0	return 0;
545	0	}
546
547	0	len = len32;
548	0	}
549
550	0	if (len + header_len < len \|\| len + header_len > max_len \|\| len > INT_MAX) {
551	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
552	0	return 0;
553	0	}
554	0	len += header_len;
555	0	*out_len = len;
556
557	0	out = reinterpret_cast<uint8_t >(OPENSSL_malloc(len));
558	0	if (*out == nullptr) {
559	0	return 0;
560	0	}
561	0	OPENSSL_memcpy(*out, header, header_len);
562	0	if (!bio_read_full(bio, (*out) + header_len, nullptr, len - header_len)) {
563	0	OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
564	0	OPENSSL_free(*out);
565	0	return 0;
566	0	}
567
568	0	return 1;
569	0	}
570
571	0	void BIO_set_retry_special(BIO *bio) {
572	0	bio->flags \|= BIO_FLAGS_READ \| BIO_FLAGS_IO_SPECIAL;
573	0	}
574
575	0	int BIO_set_write_buffer_size(BIO *bio, int buffer_size) { return 0; }
576
577		static CRYPTO_MUTEX g_index_lock = CRYPTO_MUTEX_INIT;
578		static int g_index = BIO_TYPE_START;
579
580	0	int BIO_get_new_index(void) {
581	0	CRYPTO_MUTEX_lock_write(&g_index_lock);
582		// If \|g_index\| exceeds 255, it will collide with the flags bits.
583	0	int ret = g_index > 255 ? -1 : g_index++;
584	0	CRYPTO_MUTEX_unlock_write(&g_index_lock);
585	0	return ret;
586	0	}
587
588	6	BIO_METHOD BIO_meth_new(int type, const char name) {
589	6	BIO_METHOD *method =
590	6	reinterpret_cast<BIO_METHOD *>(OPENSSL_zalloc(sizeof(BIO_METHOD)));
591	6	if (method == nullptr) {
592	0	return nullptr;
593	0	}
594	6	method->type = type;
595	6	method->name = name;
596	6	return method;
597	6	}
598
599	0	void BIO_meth_free(BIO_METHOD *method) { OPENSSL_free(method); }
600
601	0	int BIO_meth_set_create(BIO_METHOD method, int (create_func)(BIO *)) {
602	0	method->create = create_func;
603	0	return 1;
604	0	}
605
606	6	int BIO_meth_set_destroy(BIO_METHOD method, int (destroy_func)(BIO *)) {
607	6	method->destroy = destroy_func;
608	6	return 1;
609	6	}
610
611		int BIO_meth_set_write(BIO_METHOD *method,
612	0	int (write_func)(BIO , const char *, int)) {
613	0	method->bwrite = write_func;
614	0	return 1;
615	0	}
616
617		int BIO_meth_set_read(BIO_METHOD *method,
618	6	int (read_func)(BIO , char *, int)) {
619	6	method->bread = read_func;
620	6	return 1;
621	6	}
622
623		int BIO_meth_set_gets(BIO_METHOD *method,
624	0	int (gets_func)(BIO , char *, int)) {
625	0	method->bgets = gets_func;
626	0	return 1;
627	0	}
628
629		int BIO_meth_set_ctrl(BIO_METHOD *method,
630	0	long (ctrl_func)(BIO , int, long, void *)) {
631	0	method->ctrl = ctrl_func;
632	0	return 1;
633	0	}
634
635		int BIO_meth_set_callback_ctrl(BIO_METHOD *method,
636		long (callback_ctrl_func)(BIO , int,
637	0	BIO_info_cb *)) {
638	0	method->callback_ctrl = callback_ctrl_func;
639	0	return 1;
640	0	}
641
642	30.5k	void BIO_set_data(BIO bio, void ptr) { bio->ptr = ptr; }
643
644	1.48M	void BIO_get_data(BIO bio) { return bio->ptr; }
645
646	30.5k	void BIO_set_init(BIO *bio, int init) { bio->init = init; }
647
648	0	int BIO_get_init(BIO *bio) { return bio->init; }
649
650	0	void BIO_set_shutdown(BIO *bio, int shutdown) { bio->shutdown = shutdown; }
651
652	0	int BIO_get_shutdown(BIO *bio) { return bio->shutdown; }
653
654	0	int BIO_meth_set_puts(BIO_METHOD method, int (puts)(BIO , const char )) {
655		// Ignore the parameter. We implement \|BIO_puts\| using \|BIO_write\|.
656	0	return 1;
657	0	}
658
659		int BIO_get_ex_new_index(long argl, void *argp, //
660		CRYPTO_EX_unused *unused, //
661		CRYPTO_EX_dup *dup_unused, //
662	0	CRYPTO_EX_free *free_func) {
663	0	return CRYPTO_get_ex_new_index_ex(&g_ex_data_class, argl, argp, free_func);
664	0	}
665
666	0	int BIO_set_ex_data(BIO bio, int idx, void data) {
667	0	return CRYPTO_set_ex_data(&bio->ex_data, idx, data);
668	0	}
669
670	0	void BIO_get_ex_data(const BIO bio, int idx) {
671	0	return CRYPTO_get_ex_data(&bio->ex_data, idx);
672	0	}