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[ruby/openssl] pkey: use OSSL_DECODER to load encrypted PEM on OpenSSL 3.0

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OpenSSL 3.0 has rewritten routines to load pkeys (PEM_read_bio_* and
d2i_* functions) around the newly introduced OSSL_DECODER API.

This comes with a slight behavior change. They now decrypt and parse
each encountered PEM block, then check the kind of the block. This used
to be the reverse: they checked the PEM header to see the kind, and then
decrypted the content. This means that the password callback may now be
called repeatedly.

Let's use the OSSL_DECODER API directly on OpenSSL 3.0 so that the
return value from the password callback will be reused automatically.

https://github.com/ruby/openssl/commit/a84ea531bb
This commit is contained in:
Kazuki Yamaguchi 2021-03-20 23:16:16 +09:00
parent 582606dc58
commit 6ef0f272eb
1 changed files with 40 additions and 0 deletions
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40
ext/openssl/ossl_pkey.c
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@ -79,6 +79,45 @@ ossl_pkey_new(EVP_PKEY *pkey)
return obj;
}
#if OSSL_OPENSSL_PREREQ(3, 0, 0)
# include <openssl/decoder.h>
EVP_PKEY *
ossl_pkey_read_generic(BIO *bio, VALUE pass)
{
void *ppass = (void *)pass;
OSSL_DECODER_CTX *dctx;
EVP_PKEY *pkey = NULL;
int pos = 0, pos2;
dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, "DER", NULL, NULL, 0, NULL, NULL);
if (!dctx)
goto out;
if (OSSL_DECODER_CTX_set_pem_password_cb(dctx, ossl_pem_passwd_cb, ppass) != 1)
goto out;
/* First check DER */
if (OSSL_DECODER_from_bio(dctx, bio) == 1)
goto out;
/* Then check PEM; multiple OSSL_DECODER_from_bio() calls may be needed */
OSSL_BIO_reset(bio);
if (OSSL_DECODER_CTX_set_input_type(dctx, "PEM") != 1)
goto out;
while (OSSL_DECODER_from_bio(dctx, bio) != 1) {
if (BIO_eof(bio))
goto out;
pos2 = BIO_tell(bio);
if (pos2 < 0 || pos2 <= pos)
goto out;
pos = pos2;
}
out:
OSSL_DECODER_CTX_free(dctx);
return pkey;
}
#else
EVP_PKEY *
ossl_pkey_read_generic(BIO *bio, VALUE pass)
{
@ -107,6 +146,7 @@ ossl_pkey_read_generic(BIO *bio, VALUE pass)
out:
return pkey;
}
#endif
/*
* call-seq: