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121 lines
3.7 KiB
Plaintext
121 lines
3.7 KiB
Plaintext
sslinfo - information about current SSL certificate for PostgreSQL
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==================================================================
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Author: Victor Wagner <vitus@cryptocom.ru>, Cryptocom LTD
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E-Mail of Cryptocom OpenSSL development group: <openssl@cryptocom.ru>
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1. Notes
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--------
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This extension won't build unless your PostgreSQL server is configured
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with --with-openssl. Information provided with these functions would
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be completely useless if you don't use SSL to connect to database.
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2. Functions Description
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------------------------
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2.1. ssl_is_used()
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~~~~~~~~~~~~~~~~~~
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ssl_is_used() RETURNS boolean;
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Returns TRUE, if current connection to server uses SSL and FALSE
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otherwise.
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2.2. ssl_client_cert_present()
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ssl_client_cert_present() RETURNS boolean
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Returns TRUE if current client have presented valid SSL client
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certificate to the server and FALSE otherwise (e.g., no SSL,
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certificate hadn't be requested by server).
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2.3. ssl_client_serial()
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~~~~~~~~~~~~~~~~~~~~~~~~
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ssl_client_serial() RETURNS numeric
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Returns serial number of current client certificate. The combination
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of certificate serial number and certificate issuer is guaranteed to
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uniquely identify certificate (but not its owner -- the owner ought to
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regularily change his keys, and get new certificates from the issuer).
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So, if you run you own CA and allow only certificates from this CA to
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be accepted by server, the serial number is the most reliable (albeit
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not very mnemonic) means to indentify user.
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2.4. ssl_client_dn()
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~~~~~~~~~~~~~~~~~~~~
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ssl_client_dn() RETURNS text
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Returns the full subject of current client certificate, converting
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character data into the current database encoding. It is assumed that
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if you use non-Latin characters in the certificate names, your
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database is able to represent these characters, too. If your database
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uses the SQL_ASCII encoding, non-Latin characters in the name will be
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represented as UTF-8 sequences.
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The result looks like '/CN=Somebody /C=Some country/O=Some organization'.
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2.5. ssl_issuer_dn()
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~~~~~~~~~~~~~~~~~~~~
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Returns the full issuer name of the client certificate, converting
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character data into current database encoding.
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The combination of the return value of this function with the
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certificate serial number uniquely identifies the certificate.
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The result of this function is really useful only if you have more
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than one trusted CA certificate in your server's root.crt file, or if
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this CA has issued some intermediate certificate authority
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certificates.
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2.6. ssl_client_dn_field()
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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ssl_client_dn_field(fieldName text) RETURNS text
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This function returns the value of the specified field in the
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certificate subject. Field names are string constants that are
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converted into ASN1 object identificators using the OpenSSL object
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database. The following values are acceptable:
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commonName (alias CN)
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surname (alias SN)
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name
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givenName (alias GN)
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countryName (alias C)
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localityName (alias L)
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stateOrProvinceName (alias ST)
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organizationName (alias O)
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organizationUnitName (alias OU)
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title
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description
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initials
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postalCode
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streetAddress
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generationQualifier
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description
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dnQualifier
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x500UniqueIdentifier
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pseudonim
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role
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emailAddress
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All of these fields are optional, except commonName. It depends
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entirely on your CA policy which of them would be included and which
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wouldn't. The meaning of these fields, howeer, is strictly defined by
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the X.500 and X.509 standards, so you cannot just assign arbitrary
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meaning to them.
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2.7 ssl_issuer_field()
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~~~~~~~~~~~~~~~~~~~
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ssl_issuer_field(fieldName text) RETURNS text;
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Does same as ssl_client_dn_field, but for the certificate issuer
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rather than the certificate subject.
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