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981d129a56
Explicitly documents that *_free(NULL) does nothing. Fixes two cases where that wasn't true. Fixes #24675. Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Tim Hudson <tjh@openssl.org> Reviewed-by: Sasa Nedvedicky <sashan@openssl.org> (Merged from https://github.com/openssl/openssl/pull/24735)
249 lines
9.8 KiB
Plaintext
249 lines
9.8 KiB
Plaintext
=pod
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=head1 NAME
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X509_LOOKUP, X509_LOOKUP_TYPE,
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X509_LOOKUP_new, X509_LOOKUP_free, X509_LOOKUP_init,
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X509_LOOKUP_shutdown,
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X509_LOOKUP_set_method_data, X509_LOOKUP_get_method_data,
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X509_LOOKUP_ctrl_ex, X509_LOOKUP_ctrl,
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X509_LOOKUP_load_file_ex, X509_LOOKUP_load_file,
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X509_LOOKUP_add_dir,
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X509_LOOKUP_add_store_ex, X509_LOOKUP_add_store,
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X509_LOOKUP_load_store_ex, X509_LOOKUP_load_store,
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X509_LOOKUP_get_store,
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X509_LOOKUP_by_subject_ex, X509_LOOKUP_by_subject,
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X509_LOOKUP_by_issuer_serial, X509_LOOKUP_by_fingerprint,
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X509_LOOKUP_by_alias
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- OpenSSL certificate lookup mechanisms
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=head1 SYNOPSIS
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#include <openssl/x509_vfy.h>
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typedef x509_lookup_st X509_LOOKUP;
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typedef enum X509_LOOKUP_TYPE;
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X509_LOOKUP *X509_LOOKUP_new(X509_LOOKUP_METHOD *method);
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int X509_LOOKUP_init(X509_LOOKUP *ctx);
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int X509_LOOKUP_shutdown(X509_LOOKUP *ctx);
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void X509_LOOKUP_free(X509_LOOKUP *ctx);
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int X509_LOOKUP_set_method_data(X509_LOOKUP *ctx, void *data);
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void *X509_LOOKUP_get_method_data(const X509_LOOKUP *ctx);
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int X509_LOOKUP_ctrl_ex(X509_LOOKUP *ctx, int cmd, const char *argc, long argl,
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char **ret, OSSL_LIB_CTX *libctx, const char *propq);
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int X509_LOOKUP_ctrl(X509_LOOKUP *ctx, int cmd, const char *argc,
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long argl, char **ret);
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int X509_LOOKUP_load_file_ex(X509_LOOKUP *ctx, char *name, long type,
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OSSL_LIB_CTX *libctx, const char *propq);
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int X509_LOOKUP_load_file(X509_LOOKUP *ctx, char *name, long type);
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int X509_LOOKUP_load_file_ex(X509_LOOKUP *ctx, char *name, long type,
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OSSL_LIB_CTX *libctx, const char *propq);
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int X509_LOOKUP_add_dir(X509_LOOKUP *ctx, char *name, long type);
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int X509_LOOKUP_add_store_ex(X509_LOOKUP *ctx, char *uri, OSSL_LIB_CTX *libctx,
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const char *propq);
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int X509_LOOKUP_add_store(X509_LOOKUP *ctx, char *uri);
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int X509_LOOKUP_load_store_ex(X509_LOOKUP *ctx, char *uri, OSSL_LIB_CTX *libctx,
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const char *propq);
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int X509_LOOKUP_load_store(X509_LOOKUP *ctx, char *uri);
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X509_STORE *X509_LOOKUP_get_store(const X509_LOOKUP *ctx);
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int X509_LOOKUP_by_subject_ex(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
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const X509_NAME *name, X509_OBJECT *ret,
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OSSL_LIB_CTX *libctx, const char *propq);
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int X509_LOOKUP_by_subject(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
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const X509_NAME *name, X509_OBJECT *ret);
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int X509_LOOKUP_by_issuer_serial(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
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const X509_NAME *name,
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const ASN1_INTEGER *serial, X509_OBJECT *ret);
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int X509_LOOKUP_by_fingerprint(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
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const unsigned char *bytes, int len,
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X509_OBJECT *ret);
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int X509_LOOKUP_by_alias(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
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const char *str, int len, X509_OBJECT *ret);
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=head1 DESCRIPTION
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The B<X509_LOOKUP> structure holds the information needed to look up
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certificates and CRLs according to an associated L<X509_LOOKUP_METHOD(3)>.
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Multiple B<X509_LOOKUP> instances can be added to an L<X509_STORE(3)>
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to enable lookup in that store.
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X509_LOOKUP_new() creates a new B<X509_LOOKUP> using the given lookup
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I<method>.
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It can also be created by calling L<X509_STORE_add_lookup(3)>, which
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will associate a B<X509_STORE> with the lookup mechanism.
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X509_LOOKUP_init() initializes the internal state and resources as
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needed by the given B<X509_LOOKUP> to do its work.
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X509_LOOKUP_shutdown() tears down the internal state and resources of
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the given B<X509_LOOKUP>.
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X509_LOOKUP_free() destructs the given B<X509_LOOKUP>.
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If the argument is NULL, nothing is done.
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X509_LOOKUP_set_method_data() and X509_LOOKUP_get_method_data()
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associates and retrieves a pointer to application data to and from the
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given B<X509_LOOKUP>, respectively.
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X509_LOOKUP_ctrl_ex() is used to set or get additional data to or from
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a B<X509_LOOKUP> structure using any control function in the
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associated L<X509_LOOKUP_METHOD(3)>.
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The arguments of the control command are passed via I<argc> and I<argl>,
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its return value via I<*ret>. The library context I<libctx> and property
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query I<propq> are used when fetching algorithms from providers.
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The meaning of the arguments depends on the I<cmd> number of the
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control command. In general, this function is not called directly, but
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wrapped by a macro call, see below.
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The control I<cmd>s known to OpenSSL are discussed in more depth
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in L</Control Commands>.
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X509_LOOKUP_ctrl() is similar to X509_LOOKUP_ctrl_ex() but
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uses NULL for the library context I<libctx> and property query I<propq>.
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X509_LOOKUP_load_file_ex() passes a filename to be loaded immediately
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into the associated B<X509_STORE>. The library context I<libctx> and property
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query I<propq> are used when fetching algorithms from providers.
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I<type> indicates what type of object is expected.
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This can only be used with a lookup using the implementation
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L<X509_LOOKUP_file(3)>.
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X509_LOOKUP_load_file() is similar to X509_LOOKUP_load_file_ex() but
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uses NULL for the library context I<libctx> and property query I<propq>.
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X509_LOOKUP_add_dir() passes a directory specification from which
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certificates and CRLs are loaded on demand into the associated
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B<X509_STORE>.
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I<type> indicates what type of object is expected.
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This can only be used with a lookup using the implementation
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L<X509_LOOKUP_hash_dir(3)>.
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X509_LOOKUP_add_store_ex() passes a URI for a directory-like structure
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from which containers with certificates and CRLs are loaded on demand
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into the associated B<X509_STORE>. The library context I<libctx> and property
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query I<propq> are used when fetching algorithms from providers.
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X509_LOOKUP_add_store() is similar to X509_LOOKUP_add_store_ex() but
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uses NULL for the library context I<libctx> and property query I<propq>.
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X509_LOOKUP_load_store_ex() passes a URI for a single container from
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which certificates and CRLs are immediately loaded into the associated
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B<X509_STORE>. The library context I<libctx> and property query I<propq> are used
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when fetching algorithms from providers.
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These functions can only be used with a lookup using the
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implementation L<X509_LOOKUP_store(3)>.
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X509_LOOKUP_load_store() is similar to X509_LOOKUP_load_store_ex() but
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uses NULL for the library context I<libctx> and property query I<propq>.
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X509_LOOKUP_load_file_ex(), X509_LOOKUP_load_file(),
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X509_LOOKUP_add_dir(),
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X509_LOOKUP_add_store_ex() X509_LOOKUP_add_store(),
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X509_LOOKUP_load_store_ex() and X509_LOOKUP_load_store() are
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implemented as macros that use X509_LOOKUP_ctrl().
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X509_LOOKUP_by_subject_ex(), X509_LOOKUP_by_subject(),
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X509_LOOKUP_by_issuer_serial(), X509_LOOKUP_by_fingerprint(), and
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X509_LOOKUP_by_alias() look up certificates and CRLs in the L<X509_STORE(3)>
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associated with the B<X509_LOOKUP> using different criteria, where the looked up
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object is stored in I<ret>.
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Some of the underlying B<X509_LOOKUP_METHOD>s will also cache objects
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matching the criteria in the associated B<X509_STORE>, which makes it
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possible to handle cases where the criteria have more than one hit.
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=head2 Control Commands
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The B<X509_LOOKUP_METHOD>s built into OpenSSL recognize the following
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X509_LOOKUP_ctrl() I<cmd>s:
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=over 4
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=item B<X509_L_FILE_LOAD>
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This is the command that X509_LOOKUP_load_file_ex() and
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X509_LOOKUP_load_file() use.
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The filename is passed in I<argc>, and the type in I<argl>.
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=item B<X509_L_ADD_DIR>
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This is the command that X509_LOOKUP_add_dir() uses.
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The directory specification is passed in I<argc>, and the type in
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I<argl>.
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=item B<X509_L_ADD_STORE>
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This is the command that X509_LOOKUP_add_store_ex() and
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X509_LOOKUP_add_store() use.
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The URI is passed in I<argc>.
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=item B<X509_L_LOAD_STORE>
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This is the command that X509_LOOKUP_load_store_ex() and
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X509_LOOKUP_load_store() use.
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The URI is passed in I<argc>.
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=back
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=head1 RETURN VALUES
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X509_LOOKUP_new() returns a B<X509_LOOKUP> pointer when successful,
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or NULL on error.
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X509_LOOKUP_init() and X509_LOOKUP_shutdown() return 1 on success, or
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0 on error.
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X509_LOOKUP_ctrl_ex() and X509_LOOKUP_ctrl()
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return -1 if the B<X509_LOOKUP> doesn't have an
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associated B<X509_LOOKUP_METHOD>, or 1 if the X<509_LOOKUP_METHOD>
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doesn't have a control function.
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Otherwise, it returns what the control function in the
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B<X509_LOOKUP_METHOD> returns, which is usually 1 on success and 0 on error
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but could also be -1 on failure.
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X509_LOOKUP_get_store() returns a B<X509_STORE> pointer if there is
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one, otherwise NULL.
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X509_LOOKUP_by_subject_ex() returns 0 if there is no B<X509_LOOKUP_METHOD>
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that implements any of the get_by_subject_ex() or get_by_subject() functions.
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It calls get_by_subject_ex() if present, otherwise get_by_subject(), and returns
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the result of the function, which is usually 1 on success and 0 on error.
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X509_LOOKUP_by_subject() is similar to X509_LOOKUP_by_subject_ex()
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but passes NULL for both the libctx and propq.
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X509_LOOKUP_by_issuer_serial(), X509_LOOKUP_by_fingerprint(), and
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X509_LOOKUP_by_alias() all return 0 if there is no B<X509_LOOKUP_METHOD> or that
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method doesn't implement the corresponding function.
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Otherwise, they return what the corresponding function in the
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B<X509_LOOKUP_METHOD> returns, which is usually 1 on success and 0 in
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error.
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=head1 SEE ALSO
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L<X509_LOOKUP_METHOD(3)>, L<X509_STORE(3)>
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=head1 HISTORY
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The functions X509_LOOKUP_by_subject_ex() and
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X509_LOOKUP_ctrl_ex() were added in OpenSSL 3.0.
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The macros X509_LOOKUP_load_file_ex(),
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X509_LOOKUP_load_store_ex() and 509_LOOKUP_add_store_ex() were
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added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2020-2021 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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