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b077aed33b
Migrate to OpenSSL 3.0 in advance of FreeBSD 14.0. OpenSSL 1.1.1 (the version we were previously using) will be EOL as of 2023-09-11. Most of the base system has already been updated for a seamless switch to OpenSSL 3.0. For many components we've added `-DOPENSSL_API_COMPAT=0x10100000L` to CFLAGS to specify the API version, which avoids deprecation warnings from OpenSSL 3.0. Changes have also been made to avoid OpenSSL APIs that were already deprecated in OpenSSL 1.1.1. The process of updating to contemporary APIs can continue after this merge. Additional changes are still required for libarchive and Kerberos- related libraries or tools; workarounds will immediately follow this commit. Fixes are in progress in the upstream projects and will be incorporated when those are next updated. There are some performance regressions in benchmarks (certain tests in `openssl speed`) and in some OpenSSL consumers in ports (e.g. haproxy). Investigation will continue for these. Netflix's testing showed no functional regression and a rather small, albeit statistically significant, increase in CPU consumption with OpenSSL 3.0. Thanks to ngie@ and des@ for updating base system components, to antoine@ and bofh@ for ports exp-runs and port fixes/workarounds, and to Netflix and everyone who tested prior to commit or contributed to this update in other ways. PR: 271615 PR: 271656 [exp-run] Relnotes: Yes Sponsored by: The FreeBSD Foundation
144 lines
5.3 KiB
Plaintext
144 lines
5.3 KiB
Plaintext
=pod
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=head1 NAME
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CRYPTO_secure_malloc_init, CRYPTO_secure_malloc_initialized,
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CRYPTO_secure_malloc_done, OPENSSL_secure_malloc, CRYPTO_secure_malloc,
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OPENSSL_secure_zalloc, CRYPTO_secure_zalloc, OPENSSL_secure_free,
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CRYPTO_secure_free, OPENSSL_secure_clear_free,
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CRYPTO_secure_clear_free, OPENSSL_secure_actual_size,
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CRYPTO_secure_allocated,
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CRYPTO_secure_used - secure heap storage
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=head1 SYNOPSIS
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#include <openssl/crypto.h>
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int CRYPTO_secure_malloc_init(size_t size, size_t minsize);
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int CRYPTO_secure_malloc_initialized();
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int CRYPTO_secure_malloc_done();
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void *OPENSSL_secure_malloc(size_t num);
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void *CRYPTO_secure_malloc(size_t num, const char *file, int line);
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void *OPENSSL_secure_zalloc(size_t num);
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void *CRYPTO_secure_zalloc(size_t num, const char *file, int line);
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void OPENSSL_secure_free(void* ptr);
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void CRYPTO_secure_free(void *ptr, const char *, int);
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void OPENSSL_secure_clear_free(void* ptr, size_t num);
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void CRYPTO_secure_clear_free(void *ptr, size_t num, const char *, int);
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size_t OPENSSL_secure_actual_size(const void *ptr);
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int CRYPTO_secure_allocated(const void *ptr);
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size_t CRYPTO_secure_used();
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=head1 DESCRIPTION
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In order to help protect applications (particularly long-running servers)
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from pointer overruns or underruns that could return arbitrary data from
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the program's dynamic memory area, where keys and other sensitive
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information might be stored, OpenSSL supports the concept of a "secure heap."
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The level and type of security guarantees depend on the operating system.
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It is a good idea to review the code and see if it addresses your
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threat model and concerns.
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If a secure heap is used, then private key B<BIGNUM> values are stored there.
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This protects long-term storage of private keys, but will not necessarily
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put all intermediate values and computations there.
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CRYPTO_secure_malloc_init() creates the secure heap, with the specified
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C<size> in bytes. The C<minsize> parameter is the minimum size to
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allocate from the heap or zero to use a reasonable default value.
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Both C<size> and, if specified, C<minsize> must be a power of two and
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C<minsize> should generally be small, for example 16 or 32.
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C<minsize> must be less than a quarter of C<size> in any case.
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CRYPTO_secure_malloc_initialized() indicates whether or not the secure
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heap as been initialized and is available.
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CRYPTO_secure_malloc_done() releases the heap and makes the memory unavailable
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to the process if all secure memory has been freed.
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It can take noticeably long to complete.
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OPENSSL_secure_malloc() allocates C<num> bytes from the heap.
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If CRYPTO_secure_malloc_init() is not called, this is equivalent to
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calling OPENSSL_malloc().
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It is a macro that expands to
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CRYPTO_secure_malloc() and adds the C<__FILE__> and C<__LINE__> parameters.
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OPENSSL_secure_zalloc() and CRYPTO_secure_zalloc() are like
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OPENSSL_secure_malloc() and CRYPTO_secure_malloc(), respectively,
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except that they call memset() to zero the memory before returning.
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OPENSSL_secure_free() releases the memory at C<ptr> back to the heap.
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It must be called with a value previously obtained from
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OPENSSL_secure_malloc().
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If CRYPTO_secure_malloc_init() is not called, this is equivalent to
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calling OPENSSL_free().
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It exists for consistency with OPENSSL_secure_malloc() , and
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is a macro that expands to CRYPTO_secure_free() and adds the C<__FILE__>
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and C<__LINE__> parameters..
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OPENSSL_secure_clear_free() is similar to OPENSSL_secure_free() except
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that it has an additional C<num> parameter which is used to clear
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the memory if it was not allocated from the secure heap.
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If CRYPTO_secure_malloc_init() is not called, this is equivalent to
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calling OPENSSL_clear_free().
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OPENSSL_secure_actual_size() tells the actual size allocated to the
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pointer; implementations may allocate more space than initially
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requested, in order to "round up" and reduce secure heap fragmentation.
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OPENSSL_secure_allocated() tells if a pointer is allocated in the secure heap.
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CRYPTO_secure_used() returns the number of bytes allocated in the
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secure heap.
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=head1 RETURN VALUES
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CRYPTO_secure_malloc_init() returns 0 on failure, 1 if successful,
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and 2 if successful but the heap could not be protected by memory
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mapping.
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CRYPTO_secure_malloc_initialized() returns 1 if the secure heap is
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available (that is, if CRYPTO_secure_malloc_init() has been called,
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but CRYPTO_secure_malloc_done() has not been called or failed) or 0 if not.
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OPENSSL_secure_malloc() and OPENSSL_secure_zalloc() return a pointer into
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the secure heap of the requested size, or C<NULL> if memory could not be
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allocated.
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CRYPTO_secure_allocated() returns 1 if the pointer is in the secure heap, or 0 if not.
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CRYPTO_secure_malloc_done() returns 1 if the secure memory area is released, or 0 if not.
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OPENSSL_secure_free() and OPENSSL_secure_clear_free() return no values.
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=head1 SEE ALSO
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L<OPENSSL_malloc(3)>,
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L<BN_new(3)>
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=head1 HISTORY
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The OPENSSL_secure_clear_free() function was added in OpenSSL 1.1.0g.
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The second argument to CRYPTO_secure_malloc_init() was changed from an B<int> to
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a B<size_t> in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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