Detect and prevent recursive config parsing

If a malformed config file is provided such as the following:

openssl_conf = openssl_init
[openssl_init]
providers = provider_sec

Detect and prevent recursive config parsing

If a malformed config file is provided such as the following:

openssl_conf = openssl_init
[openssl_init]
providers = provider_sect
[provider_sect]
= provider_sect

The config parsing library will crash overflowing the stack, as it
recursively parses the same provider_sect ad nauseum.

Prevent this by maintaing a list of visited nodes as we recurse through
referenced sections, and erroring out in the event we visit any given
section node more than once.

Note, adding the test for this revealed that our diagnostic code
inadvertently pops recorded errors off the error stack because
provider_conf_load returns success even in the event that a
configuration parse failed. The call path to provider_conf_load has been
updated in this commit to address that shortcoming, allowing recorded
errors to be visibile to calling applications.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22898)

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err: rename err_load_xxx_strings_int functions

The new names are ossl_err_load_xxx_strings.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Richard Levitte <levitte@ope

err: rename err_load_xxx_strings_int functions

The new names are ossl_err_load_xxx_strings.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15446)

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Allow absolute paths to be set

It was a mistake to allow relative paths for include files (just
like root shouldn't have "." in its PATH), but we probably can't
change it now. Add a

Allow absolute paths to be set

It was a mistake to allow relative paths for include files (just
like root shouldn't have "." in its PATH), but we probably can't
change it now. Add a new pragma "abspath" that someone can put
in the system-wide config file to require absolute paths.

Also update the config documentation to better explain how file
inclusion works.

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15090)

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Update copyright year

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/13533)

ERR: Rebuild all generated error headers and source files

This is the result of 'make errors ERROR_REBUILD=-rebuild'

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from ht

ERR: Rebuild all generated error headers and source files

This is the result of 'make errors ERROR_REBUILD=-rebuild'

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13390)

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