Fix #78516: password_hash(): Memory cost is outside of allowed memory…#4695
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cmb69 wants to merge 5 commits intophp:PHP-7.4from
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Fix #78516: password_hash(): Memory cost is outside of allowed memory…#4695cmb69 wants to merge 5 commits intophp:PHP-7.4from
cmb69 wants to merge 5 commits intophp:PHP-7.4from
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… range libsodium measures the memory cost in bytes, while password_hash() and friends expect kibibyte values. We have to properly map between these scales not only when calling libsodium functions, but also when checking for allowed values.
Girgias
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Sep 10, 2019
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Unless there are objections, I'll merge this PR on next Monday (so that it makes it into PHP 7.4.0RC2). |
nikic
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Sep 11, 2019
nikic
reviewed
Sep 14, 2019
nikic
reviewed
Sep 14, 2019
ext/sodium/sodium_pwhash.c
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| const char* p = NULL; | ||
| zend_long v = 0, threads = 1; | ||
| zend_long memory_cost = PHP_SODIUM_PWHASH_MEMLIMIT; | ||
| zend_long memory_cost = PHP_SODIUM_PWHASH_MEMLIMIT << 10; |
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I don't think this one is right. It shouldn't really happen anyway (that means that the sscanf failed and the hash is essentially corrupt), but if in this context memory_cost shouldn't by multiplied by 1k, I think
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Oh, you're right.
It seems to me that we should catch failing sscanf() here. Otherwise password_needs_rehash() may return true, although password_get_info() returns values which wouldn't indicate that.
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Applied as 145ffd9. Thanks! |
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… range
libsodium measures the memory cost in bytes, while password_hash() and
friends expect kibibyte values. We have to properly map between these
scales not only when calling libsodium functions, but also when
checking for allowed values.
cc @sgolemon