diff options
Diffstat (limited to 'lib/ssl/doc/src/ssl.xml')
| -rw-r--r-- | lib/ssl/doc/src/ssl.xml | 525 |
1 files changed, 393 insertions, 132 deletions
diff --git a/lib/ssl/doc/src/ssl.xml b/lib/ssl/doc/src/ssl.xml index f23b71e28b..3db5aa19ac 100644 --- a/lib/ssl/doc/src/ssl.xml +++ b/lib/ssl/doc/src/ssl.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1999</year><year>2015</year> + <year>1999</year><year>2017</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -31,37 +31,13 @@ <module>ssl</module> <modulesummary>Interface Functions for Secure Socket Layer</modulesummary> <description> - <p>This module contains interface functions for the SSL.</p> + <p> + This module contains interface functions for the SSL/TLS protocol. + For detailed information about the supported standards see + <seealso marker="ssl_app">ssl(6)</seealso>. + </p> </description> - - <section> - <title>SSL</title> - - <list type="bulleted"> - <item>For application dependencies see <seealso marker="ssl_app"> ssl(6)</seealso> </item> - <item>Supported SSL/TLS-versions are SSL-3.0, TLS-1.0, - TLS-1.1, and TLS-1.2.</item> - <item>For security reasons SSL-2.0 is not supported.</item> - <item>For security reasons SSL-3.0 is no longer supported by default, - but can be configured.</item> - <item>Ephemeral Diffie-Hellman cipher suites are supported, - but not Diffie Hellman Certificates cipher suites.</item> - <item>Elliptic Curve cipher suites are supported if the Crypto - application supports it and named curves are used. - </item> - <item>Export cipher suites are not supported as the - U.S. lifted its export restrictions in early 2000.</item> - <item>IDEA cipher suites are not supported as they have - become deprecated by the latest TLS specification so it is not - motivated to implement them.</item> - <item>CRL validation is supported.</item> - <item>Policy certificate extensions are not supported.</item> - <item>'Server Name Indication' extension client side - (RFC 6066, Section 3) is supported.</item> - </list> - - </section> - + <section> <title>DATA TYPES</title> <p>The following data types are used in the functions for SSL:</p> @@ -72,7 +48,7 @@ <item><p><c>true | false</c></p></item> <tag><c>option() =</c></tag> - <item><p><c>socketoption() | ssloption() | transportoption()</c></p> + <item><p><c>socketoption() | ssl_option() | transport_option()</c></p> </item> <tag><c>socketoption() =</c></tag> @@ -84,15 +60,18 @@ <seealso marker="kernel:gen_tcp">gen_tcp(3)</seealso> manual pages in Kernel.</p></item> - <tag><marker id="type-ssloption"></marker><c>ssloption() =</c></tag> + <tag><marker id="type-ssloption"/><c>ssl_option() =</c></tag> <item> <p><c>{verify, verify_type()}</c></p> <p><c>| {verify_fun, {fun(), term()}}</c></p> - <p><c>| {fail_if_no_peer_cert, boolean()} {depth, integer()}</c></p> + <p><c>| {fail_if_no_peer_cert, boolean()}</c></p> + <p><c>| {depth, integer()}</c></p> <p><c>| {cert, public_key:der_encoded()}</c></p> <p><c>| {certfile, path()}</c></p> <p><c>| {key, {'RSAPrivateKey'| 'DSAPrivateKey' | 'ECPrivateKey' - | 'PrivateKeyInfo', public_key:der_encoded()}}</c></p> + | 'PrivateKeyInfo', public_key:der_encoded()} | + #{algorithm := rsa | dss | ecdsa, + engine := crypto:engine_ref(), key_id := crypto:key_id(), password => crypto:password()}</c></p> <p><c>| {keyfile, path()}</c></p> <p><c>| {password, string()}</c></p> <p><c>| {cacerts, [public_key:der_encoded()]}</c></p> @@ -108,11 +87,11 @@ [binary()]} | {client | server, [binary()], binary()}}</c></p> <p><c>| {log_alert, boolean()}</c></p> <p><c>| {server_name_indication, hostname() | disable}</c></p> - <p><c>| {sni_hosts, [{hostname(), ssloptions()}]}</c></p> + <p><c>| {sni_hosts, [{hostname(), [ssl_option()]}]}</c></p> <p><c>| {sni_fun, SNIfun::fun()}</c></p> </item> - <tag><c>transportoption() =</c></tag> + <tag><c>transport_option() =</c></tag> <item><p><c>{cb_info, {CallbackModule::atom(), DataTag::atom(), ClosedTag::atom(), ErrTag:atom()}}</c></p> @@ -150,7 +129,7 @@ <item><p><c>hostname() | ipaddress()</c></p></item> <tag><c>hostname() =</c></tag> - <item><p><c>string()</c></p></item> + <item><p><c>string() - DNS hostname</c></p></item> <tag><c>ip_address() =</c></tag> <item><p><c>{N1,N2,N3,N4} % IPv4 | {K1,K2,K3,K4,K5,K6,K7,K8} % IPv6 @@ -159,15 +138,20 @@ <tag><c>sslsocket() =</c></tag> <item><p>opaque()</p></item> - <tag><c>protocol() =</c></tag> + <tag><marker id="type-protocol"/><c>protocol_version() =</c></tag> <item><p><c>sslv3 | tlsv1 | 'tlsv1.1' | 'tlsv1.2'</c></p></item> <tag><c>ciphers() =</c></tag> - <item><p><c>= [ciphersuite()] | string()</c></p> - <p>According to old API.</p></item> + <item><p><c>= [ciphersuite()]</c></p> + <p>Tuples and string formats accepted by versions + before ssl-8.2.4 will be converted for backwards compatibility</p></item> <tag><c>ciphersuite() =</c></tag> - <item><p><c>{key_exchange(), cipher(), hash()}</c></p></item> + <item><p><c> + #{key_exchange := key_exchange(), + cipher := cipher(), + mac := MAC::hash() | aead, + prf := PRF::hash() | default_prf} </c></p></item> <tag><c>key_exchange()=</c></tag> <item><p><c>rsa | dhe_dss | dhe_rsa | dh_anon | psk | dhe_psk @@ -176,20 +160,34 @@ <tag><c>cipher() =</c></tag> <item><p><c>rc4_128 | des_cbc | '3des_ede_cbc' - | aes_128_cbc | aes_256_cbc | aes_128_gcm | aes_256_gcm</c></p></item> + | aes_128_cbc | aes_256_cbc | aes_128_gcm | aes_256_gcm | chacha20_poly1305</c></p></item> <tag><c>hash() =</c></tag> - <item><p><c>md5 | sha</c></p></item> + <item><p><c>md5 | sha | sha224 | sha256 | sha348 | sha512</c></p></item> <tag><c>prf_random() =</c></tag> <item><p><c>client_random | server_random</c></p></item> + <tag><c>cipher_filters() =</c></tag> + <item><p><c> [{key_exchange | cipher | mac | prf, algo_filter()}])</c></p></item> + + <tag><c>algo_filter() =</c></tag> + <item><p>fun(key_exchange() | cipher() | hash() | aead | default_prf) -> true | false </p></item> + <tag><c>srp_param_type() =</c></tag> <item><p><c>srp_1024 | srp_1536 | srp_2048 | srp_3072 | srp_4096 | srp_6144 | srp_8192</c></p></item> <tag><c>SNIfun::fun()</c></tag> - <item><p><c>= fun(ServerName :: string()) -> ssloptions()</c></p></item> + <item><p><c>= fun(ServerName :: string()) -> [ssl_option()]</c></p></item> + + <tag><c>named_curve() =</c></tag> + <item><p><c>sect571r1 | sect571k1 | secp521r1 | brainpoolP512r1 + | sect409k1 | sect409r1 | brainpoolP384r1 | secp384r1 + | sect283k1 | sect283r1 | brainpoolP256r1 | secp256k1 | secp256r1 + | sect239k1 | sect233k1 | sect233r1 | secp224k1 | secp224r1 + | sect193r1 | sect193r2 | secp192k1 | secp192r1 | sect163k1 + | sect163r1 | sect163r2 | secp160k1 | secp160r1 | secp160r2</c></p></item> </taglist> </section> @@ -202,6 +200,11 @@ <taglist> + <tag><c>{protocol, tls | dtls}</c></tag> + <item><p>Choose TLS or DTLS protocol for the transport layer security. + Defaults to <c>tls</c> Introduced in OTP 20, DTLS support is considered + experimental in this release. DTLS over other transports than UDP are not yet supported.</p></item> + <tag><c>{cert, public_key:der_encoded()}</c></tag> <item><p>The DER-encoded users certificate. If this option is supplied, it overrides option <c>certfile</c>.</p></item> @@ -209,9 +212,15 @@ <tag><c>{certfile, path()}</c></tag> <item><p>Path to a file containing the user certificate.</p></item> - <tag><c>{key, {'RSAPrivateKey'| 'DSAPrivateKey' | 'ECPrivateKey' - |'PrivateKeyInfo', public_key:der_encoded()}}</c></tag> - <item><p>The DER-encoded user's private key. If this option + <tag> + <marker id="key_option_def"/> + <c>{key, {'RSAPrivateKey'| 'DSAPrivateKey' | 'ECPrivateKey' + |'PrivateKeyInfo', public_key:der_encoded()} | #{algorithm := rsa | dss | ecdsa, + engine := crypto:engine_ref(), key_id := crypto:key_id(), password => crypto:password()}</c></tag> + <item><p>The DER-encoded user's private key or a map refering to a crypto + engine and its key reference that optionally can be password protected, + seealso <seealso marker="crypto:crypto#engine_load-4"> crypto:engine_load/4 + </seealso> and <seealso marker="crypto:engine_load"> Crypto's Users Guide</seealso>. If this option is supplied, it overrides option <c>keyfile</c>.</p></item> <tag><c>{keyfile, path()}</c></tag> @@ -238,13 +247,18 @@ Anonymous cipher suites are supported for testing purposes only and are not be used when security matters.</p></item> + <tag><c>{eccs, [named_curve()]}</c></tag> + <item><p> Allows to specify the order of preference for named curves + and to restrict their usage when using a cipher suite supporting them. + </p></item> + <tag><c>{secure_renegotiate, boolean()}</c></tag> <item><p>Specifies if to reject renegotiation attempt that does not live up to <url href="http://www.ietf.org/rfc/rfc5746.txt">RFC 5746</url>. By default <c>secure_renegotiate</c> is set to <c>false</c>, that is, secure renegotiation is used if possible, - but it fallback to unsecure renegotiation if the peer + but it falls back to insecure renegotiation if the peer does not support <url href="http://www.ietf.org/rfc/rfc5746.txt">RFC 5746</url>.</p> </item> @@ -257,7 +271,7 @@ be PEER, CA, ROOT-CA; if 2 the path can be PEER, CA, CA, ROOT-CA, and so on. The default value is 1.</p></item> - <tag><c>{verify_fun, {Verifyfun :: fun(), InitialUserState :: + <tag><marker id="verify_fun"/><c>{verify_fun, {Verifyfun :: fun(), InitialUserState :: term()}}</c></tag> <item><p>The verification fun is to be defined as follows:</p> @@ -292,7 +306,11 @@ atom()}} | terminate regarding verification failures and the connection is established.</p></item> <item><p>If called with an extension unknown to the user application, - return value <c>{unknown, UserState}</c> is to be used.</p></item> + return value <c>{unknown, UserState}</c> is to be used.</p> + + <p>Note that if the fun returns <c>unknown</c> for an extension marked + as critical, validation will fail.</p> + </item> </list> <p>Default option <c>verify_fun</c> in <c>verify_peer mode</c>:</p> @@ -314,6 +332,8 @@ atom()}} | <code> {fun(_,{bad_cert, _}, UserState) -> {valid, UserState}; + (_,{extension, #'Extension'{critical = true}}, UserState) -> + {valid, UserState}; (_,{extension, _}, UserState) -> {unknown, UserState}; (_, valid, UserState) -> @@ -330,7 +350,7 @@ atom()}} | <tag><c>unknown_ca</c></tag> <item><p>No trusted CA was found in the trusted store. The trusted CA is normally a so called ROOT CA, which is a self-signed certificate. Trust can - be claimed for an intermediat CA (trusted anchor does not have to be + be claimed for an intermediate CA (trusted anchor does not have to be self-signed according to X-509) by using option <c>partial_chain</c>.</p> </item> @@ -346,39 +366,96 @@ marker="public_key:public_key#pkix_path_validation-3">public_key:pkix_path_valid <tag><c>{crl_check, boolean() | peer | best_effort }</c></tag> <item> - Perform CRL (Certificate Revocation List) verification + <p>Perform CRL (Certificate Revocation List) verification <seealso marker="public_key:public_key#pkix_crls_validate-3"> (public_key:pkix_crls_validate/3)</seealso> on all the certificates during the path validation <seealso marker="public_key:public_key#pkix_path_validation-3">(public_key:pkix_path_validation/3) </seealso> - of the certificate chain. Defaults to false. + of the certificate chain. Defaults to <c>false</c>.</p> - <p><c>peer</c> - check is only performed on - the peer certificate.</p> + <taglist> + <tag><c>peer</c></tag> + <item>check is only performed on the peer certificate.</item> - <p><c>best_effort</c> - if certificate revocation status can not be determined - it will be accepted as valid.</p> + <tag><c>best_effort</c></tag> + <item>if certificate revocation status can not be determined + it will be accepted as valid.</item> + </taglist> <p>The CA certificates specified for the connection will be used to construct the certificate chain validating the CRLs.</p> - <p>The CRLs will be fetched from a local or external cache see + <p>The CRLs will be fetched from a local or external cache. See <seealso marker="ssl:ssl_crl_cache_api">ssl_crl_cache_api(3)</seealso>.</p> </item> <tag><c>{crl_cache, {Module :: atom(), {DbHandle :: internal | term(), Args :: list()}}}</c></tag> <item> - <p>Module defaults to ssl_crl_cache with <c> DbHandle </c> internal and an - empty argument list. The following arguments may be specified for the internal cache.</p> + <p>Specify how to perform lookup and caching of certificate revocation lists. + <c>Module</c> defaults to <seealso marker="ssl:ssl_crl_cache">ssl_crl_cache</seealso> + with <c> DbHandle </c> being <c>internal</c> and an + empty argument list.</p> + + <p>There are two implementations available:</p> + <taglist> - <tag><c>{http, timeout()}</c></tag> - <item><p> - Enables fetching of CRLs specified as http URIs in<seealso - marker="public_key:public_key_records"> X509 cerificate extensions.</seealso> - Requires the OTP inets application.</p> - </item> - </taglist> + <tag><c>ssl_crl_cache</c></tag> + <item> + <p>This module maintains a cache of CRLs. CRLs can be + added to the cache using the function <seealso + marker="ssl:ssl_crl_cache#insert-1">ssl_crl_cache:insert/1</seealso>, + and optionally automatically fetched through HTTP if the + following argument is specified:</p> + + <taglist> + <tag><c>{http, timeout()}</c></tag> + <item><p> + Enables fetching of CRLs specified as http URIs in<seealso + marker="public_key:public_key_records">X509 certificate extensions</seealso>. + Requires the OTP inets application.</p> + </item> + </taglist> + </item> + + <tag><c>ssl_crl_hash_dir</c></tag> + <item> + <p>This module makes use of a directory where CRLs are + stored in files named by the hash of the issuer name.</p> + + <p>The file names consist of eight hexadecimal digits + followed by <c>.rN</c>, where <c>N</c> is an integer, + e.g. <c>1a2b3c4d.r0</c>. For the first version of the + CRL, <c>N</c> starts at zero, and for each new version, + <c>N</c> is incremented by one. The OpenSSL utility + <c>c_rehash</c> creates symlinks according to this + pattern.</p> + + <p>For a given hash value, this module finds all + consecutive <c>.r*</c> files starting from zero, and those + files taken together make up the revocation list. CRL + files whose <c>nextUpdate</c> fields are in the past, or + that are issued by a different CA that happens to have the + same name hash, are excluded.</p> + + <p>The following argument is required:</p> + + <taglist> + <tag><c>{dir, string()}</c></tag> + <item><p>Specifies the directory in which the CRLs can be found.</p></item> + </taglist> + + </item> + + <tag><c>max_handshake_size</c></tag> + <item> + <p>Integer (24 bits unsigned). Used to limit the size of + valid TLS handshake packets to avoid DoS attacks. + Defaults to 256*1024.</p> + </item> + + </taglist> + </item> <tag><c>{partial_chain, fun(Chain::[DerCert]) -> {trusted_ca, DerCert} | @@ -388,7 +465,7 @@ marker="public_key:public_key#pkix_path_validation-3">public_key:pkix_path_valid marker="public_key:public_key#pkix_path_validation-3">public_key:pkix_path_validation/3</seealso> with the selected CA as trusted anchor and the rest of the chain.</p></item> - <tag><c>{versions, [protocol()]}</c></tag> + <tag><c>{versions, [protocol_version()]}</c></tag> <item><p>TLS protocol versions supported by started clients and servers. This option overrides the application environment option <c>protocol_version</c>. If the environment option is not set, it defaults @@ -430,12 +507,28 @@ fun(srp, Username :: string(), UserState :: term()) -> <tag><c>{padding_check, boolean()}</c></tag> <item><p>Affects TLS-1.0 connections only. If set to <c>false</c>, it disables the block cipher padding check - to be able to interoperate with legacy software.</p></item> + to be able to interoperate with legacy software.</p> + <warning><p>Using <c>{padding_check, boolean()}</c> makes TLS + vulnerable to the Poodle attack.</p></warning> + </item> - </taglist> + - <warning><p>Using <c>{padding_check, boolean()}</c> makes TLS - vulnerable to the Poodle attack.</p></warning> + <tag><c>{beast_mitigation, one_n_minus_one | zero_n | disabled}</c></tag> + <item><p>Affects SSL-3.0 and TLS-1.0 connections only. Used to change the BEAST + mitigation strategy to interoperate with legacy software. + Defaults to <c>one_n_minus_one</c>.</p> + + <p><c>one_n_minus_one</c> - Perform 1/n-1 BEAST mitigation.</p> + + <p><c>zero_n</c> - Perform 0/n BEAST mitigation.</p> + + <p><c>disabled</c> - Disable BEAST mitigation.</p> + + <warning><p>Using <c>{beast_mitigation, disabled}</c> makes SSL or TLS + vulnerable to the BEAST attack.</p></warning> + </item> + </taglist> </section> @@ -479,8 +572,8 @@ fun(srp, Username :: string(), UserState :: term()) -> <p>The negotiated protocol can be retrieved using the <c>negotiated_protocol/1</c> function.</p> </item> - <tag><c>{client_preferred_next_protocols, {Precedence :: server | client, ClientPrefs :: [binary()]}}</c></tag> - <tag><c>{client_preferred_next_protocols, {Precedence :: server | client, ClientPrefs :: [binary()], Default :: binary()}}</c></tag> + <tag><c>{client_preferred_next_protocols, {Precedence :: server | client, ClientPrefs :: [binary()]}}</c><br/> + <c>{client_preferred_next_protocols, {Precedence :: server | client, ClientPrefs :: [binary()], Default :: binary()}}</c></tag> <item> <p>Indicates that the client is to try to perform Next Protocol Negotiation.</p> @@ -511,16 +604,21 @@ fun(srp, Username :: string(), UserState :: term()) -> <item><p>Specifies the username and password to use to authenticate to the server.</p></item> - <tag><c>{server_name_indication, hostname()}</c></tag> - <item><p>Can be specified when upgrading a TCP socket to a TLS - socket to use the TLS Server Name Indication extension.</p></item> - - <tag><c>{server_name_indication, disable}</c></tag> - <item> - <p>When starting a TLS connection without upgrade, the Server Name - Indication extension is sent if possible. This option can be - used to disable that behavior.</p> + <tag><c>{server_name_indication, HostName :: hostname()}</c></tag> + <item><p>Specify the hostname to be used in TLS Server Name Indication extension. + If not specified it will default to the <c>Host</c> argument of <seealso marker="#connect-3">connect/[3,4]</seealso> + unless it is of type inet:ipaddress().</p> + <p> + The <c>HostName</c> will also be used in the hostname verification of the peer certificate using + <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso>. + </p> </item> + <tag><c>{server_name_indication, disable}</c></tag> + <item> + <p> Prevents the Server Name Indication extension from being sent and + disables the hostname verification check + <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso> </p> + </item> <tag><c>{fallback, boolean()}</c></tag> <item> <p> Send special cipher suite TLS_FALLBACK_SCSV to avoid undesired TLS version downgrade. @@ -537,10 +635,43 @@ fun(srp, Username :: string(), UserState :: term()) -> be supported by the server for the prevention to work. </p></warning> </item> - - </taglist> + <tag><marker id="client_signature_algs"/><c>{signature_algs, [{hash(), ecdsa | rsa | dsa}]}</c></tag> + <item> + <p>In addition to the algorithms negotiated by the cipher + suite used for key exchange, payload encryption, message + authentication and pseudo random calculation, the TLS signature + algorithm extension <url + href="http://www.ietf.org/rfc/rfc5246.txt">Section 7.4.1.4.1 in RFC 5246</url> may be + used, from TLS 1.2, to negotiate which signature algorithm to use during the + TLS handshake. If no lower TLS versions than 1.2 are supported, + the client will send a TLS signature algorithm extension + with the algorithms specified by this option. + Defaults to</p> + + <code>[ +%% SHA2 +{sha512, ecdsa}, +{sha512, rsa}, +{sha384, ecdsa}, +{sha384, rsa}, +{sha256, ecdsa}, +{sha256, rsa}, +{sha224, ecdsa}, +{sha224, rsa}, +%% SHA +{sha, ecdsa}, +{sha, rsa}, +{sha, dsa}, +]</code> +<p> + The algorithms should be in the preferred order. + Selected signature algorithm can restrict which hash functions + that may be selected. Default support for {md5, rsa} removed in ssl-8.0 + </p> + </item> + </taglist> </section> - + <section> <title>SSL OPTION DESCRIPTIONS - SERVER SIDE</title> @@ -633,20 +764,20 @@ fun(srp, Username :: string(), UserState :: term()) -> selection. If set to <c>false</c> (the default), use the client preference.</p></item> - <tag><c>{sni_hosts, [{hostname(), ssloptions()}]}</c></tag> + <tag><c>{sni_hosts, [{hostname(), [ssl_option()]}]}</c></tag> <item><p>If the server receives a SNI (Server Name Indication) from the client - matching a host listed in the <c>sni_hosts</c> option, the speicific options for + matching a host listed in the <c>sni_hosts</c> option, the specific options for that host will override previously specified options. The option <c>sni_fun</c>, and <c>sni_hosts</c> are mutually exclusive.</p></item> <tag><c>{sni_fun, SNIfun::fun()}</c></tag> <item><p>If the server receives a SNI (Server Name Indication) from the client, - the given function will be called to retrive <c>ssloptions()</c> for indicated server. - These options will be merged into predefined <c>ssloptions()</c>. + the given function will be called to retrieve <c>[ssl_option()]</c> for the indicated server. + These options will be merged into predefined <c>[ssl_option()]</c>. The function should be defined as: - <c>fun(ServerName :: string()) -> ssloptions()</c> + <c>fun(ServerName :: string()) -> [ssl_option()]</c> and can be specified as a fun or as named <c>fun module:function/1</c> The option <c>sni_fun</c>, and <c>sni_hosts</c> are mutually exclusive.</p></item> @@ -656,22 +787,36 @@ fun(srp, Username :: string(), UserState :: term()) -> of resources of such an operation is higher for the server than the client. This can act as a vector for denial of service attacks. The SSL application already takes measures to counter-act such attempts, - but client-initiated renegotiation can be stricly disabled by setting + but client-initiated renegotiation can be strictly disabled by setting this option to <c>false</c>. The default value is <c>true</c>. Note that disabling renegotiation can result in long-lived connections becoming unusable due to limits on the number of messages the underlying cipher suite can encipher. </item> - <tag><c>{psk_identity, string()}</c></tag> - <item>Specifies the server identity hint the server presents to the client. - </item> - <tag><c>{log_alert, boolean()}</c></tag> - <item>If false, error reports will not be displayed.</item> <tag><c>{honor_cipher_order, boolean()}</c></tag> <item>If true, use the server's preference for cipher selection. If false (the default), use the client's preference. </item> + + <tag><c>{honor_ecc_order, boolean()}</c></tag> + <item>If true, use the server's preference for ECC curve selection. If false + (the default), use the client's preference. + </item> + + <tag><c>{signature_algs, [{hash(), ecdsa | rsa | dsa}]}</c></tag> + <item><p> The algorithms specified by + this option will be the ones accepted by the server in a signature algorithm + negotiation, introduced in TLS-1.2. The algorithms will also be offered to the client if a + client certificate is requested. For more details see the <seealso marker="#client_signature_algs">corresponding client option</seealso>. + </p> </item> + + <tag><c>{v2_hello_compatible, boolean()}</c></tag> + <item>If true, the server accepts clients that send hello messages on SSL-2.0 format but offers + supported SSL/TLS versions. Defaults to false, that is the server will not interoperate with clients that + offers SSL-2.0. + </item> + </taglist> </section> @@ -693,14 +838,34 @@ fun(srp, Username :: string(), UserState :: term()) -> </section> <funcs> + + <func> + <name>append_cipher_suites(Deferred, Suites) -> ciphers() </name> + <fsummary></fsummary> + <type> + <v>Deferred = ciphers() | cipher_filters() </v> + <v>Suites = ciphers() </v> + </type> + <desc><p>Make <c>Deferred</c> suites become the least preferred + suites, that is put them at the end of the cipher suite list + <c>Suites</c> after removing them from <c>Suites</c> if + present. <c>Deferred</c> may be a list of cipher suits or a + list of filters in which case the filters are use on <c>Suites</c> to + extract the Deferred cipher list.</p> + </desc> + </func> + <func> <name>cipher_suites() -></name> - <name>cipher_suites(Type) -> ciphers()</name> + <name>cipher_suites(Type) -> old_ciphers()</name> <fsummary>Returns a list of supported cipher suites.</fsummary> <type> <v>Type = erlang | openssl | all</v> </type> - <desc><p>Returns a list of supported cipher suites. + <desc> + <p>Returns a list of supported cipher suites. + This function will become deprecated in OTP 21, and replaced + by <seealso marker="#cipher_suites-2">ssl:cipher-suites/2</seealso> <c>cipher_suites()</c> is equivalent to <c>cipher_suites(erlang).</c> Type <c>openssl</c> is provided for backwards compatibility with the old SSL, which used OpenSSL. <c>cipher_suites(all)</c> returns @@ -708,10 +873,34 @@ fun(srp, Username :: string(), UserState :: term()) -> in <c>cipher_suites(erlang)</c> but included in <c>cipher_suites(all)</c> are not used unless explicitly configured by the user.</p> + </desc> + </func> + + <func> + <name>cipher_suites(Supported, Version) -> ciphers()</name> + <fsummary>Returns a list of all default or + all supported cipher suites.</fsummary> + <type> + <v> Supported = default | all | anonymous </v> + <v> Version = protocol_version() </v> + </type> + <desc><p>Returns all default or all supported (except anonymous), or all anonymous cipher suites for a + TLS version</p> </desc> </func> <func> + <name>eccs() -></name> + <name>eccs(protocol_version()) -> [named_curve()]</name> + <fsummary>Returns a list of supported ECCs.</fsummary> + + <desc><p>Returns a list of supported ECCs. <c>eccs()</c> + is equivalent to calling <c>eccs(Protocol)</c> with all + supported protocols and then deduplicating the output.</p> + </desc> + </func> + + <func> <name>clear_pem_cache() -> ok </name> <fsummary> Clears the pem cache</fsummary> @@ -731,7 +920,7 @@ fun(srp, Username :: string(), UserState :: term()) -> equivalent, connected socket to an SSL socket.</fsummary> <type> <v>Socket = socket()</v> - <v>SslOptions = [ssloption()]</v> + <v>SslOptions = [ssl_option()]</v> <v>Timeout = integer() | infinity</v> <v>SslSocket = sslsocket()</v> <v>Reason = term()</v> @@ -739,6 +928,12 @@ fun(srp, Username :: string(), UserState :: term()) -> <desc><p>Upgrades a <c>gen_tcp</c>, or equivalent, connected socket to an SSL socket, that is, performs the client-side ssl handshake.</p> + + <note><p>If the option <c>verify</c> is set to <c>verify_peer</c> + the option <c>server_name_indication</c> shall also be specified, + if it is not no Server Name Indication extension will be sent, + and <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso> + will be called with the IP-address of the connection as <c>ReferenceID</c>, which is proably not what you want.</p></note> </desc> </func> @@ -755,7 +950,24 @@ fun(srp, Username :: string(), UserState :: term()) -> <v>SslSocket = sslsocket()</v> <v>Reason = term()</v> </type> - <desc><p>Opens an SSL connection to <c>Host</c>, <c>Port</c>.</p></desc> + <desc><p>Opens an SSL connection to <c>Host</c>, <c>Port</c>.</p> + + <p> When the option <c>verify</c> is set to <c>verify_peer</c> the check + <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso> + will be performed in addition to the usual x509-path validation checks. If the check fails the error {bad_cert, hostname_check_failed} will + be propagated to the path validation fun <seealso marker="#verify_fun">verify_fun</seealso>, where it is possible to do customized + checks by using the full possibilitis of the <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso> API. + + When the option <c>server_name_indication</c> is provided, its value (the DNS name) will be used as <c>ReferenceID</c> + to <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso>. + When no <c>server_name_indication</c> option is given, the <c>Host</c> argument will be used as + Server Name Indication extension. The <c>Host</c> argument will also be used for the + <seealso marker="public_key:public_key#pkix_verify_hostname-2">public_key:pkix_verify_hostname/2</seealso> check and if the <c>Host</c> + argument is an <c>inet:ip_address()</c> the <c>ReferenceID</c> used for the check will be <c>{ip, Host}</c> otherwise + <c>dns_id</c> will be assumed with a fallback to <c>ip</c> if that fails. </p> + <note><p>According to good practices certificates should not use IP-addresses as "server names". It would + be very surprising if this happen outside a closed network. </p></note> + </desc> </func> <func> @@ -770,18 +982,20 @@ fun(srp, Username :: string(), UserState :: term()) -> </func> <func> - <name>connection_info(SslSocket) -> - {ok, {ProtocolVersion, CipherSuite}} | {error, Reason}</name> - <fsummary>Returns the Negotiated Protocol version and cipher suite. - </fsummary> + <name>close(SslSocket, How) -> ok | {ok, port()} | {error, Reason}</name> + <fsummary>Closes an SSL connection.</fsummary> <type> - <v>CipherSuite = ciphersuite()</v> - <v>ProtocolVersion = protocol()</v> + <v>SslSocket = sslsocket()</v> + <v>How = timeout() | {NewController::pid(), timeout()} </v> + <v>Reason = term()</v> </type> - <desc><p>Returns the Negotiated Protocol version and cipher suite.</p> + <desc><p>Closes or downgrades an SSL connection. In the latter case the transport + connection will be handed over to the <c>NewController</c> process after receiving + the TLS close alert from the peer. The returned transport socket will have + the following options set: <c>[{active, false}, {packet, 0}, {mode, binary}]</c></p> </desc> </func> - + <func> <name>controlling_process(SslSocket, NewOwner) -> ok | {error, Reason}</name> @@ -800,43 +1014,57 @@ fun(srp, Username :: string(), UserState :: term()) -> <func> <name>connection_information(SslSocket) -> - {ok, Info} | {error, Reason} </name> + {ok, Result} | {error, Reason} </name> <fsummary>Returns all the connection information. </fsummary> <type> - <v>Info = [InfoTuple]</v> - <v>InfoTuple = {protocol, Protocol} | {cipher_suite, CipherSuite} | {sni_hostname, SNIHostname}</v> - <v>CipherSuite = ciphersuite()</v> - <v>ProtocolVersion = protocol()</v> - <v>SNIHostname = string()</v> + <v>Item = protocol | cipher_suite | sni_hostname | ecc | session_id | atom()</v> + <d>Meaningful atoms, not specified above, are the ssl option names.</d> + <v>Result = [{Item::atom(), Value::term()}]</v> <v>Reason = term()</v> </type> - <desc><p>Return all the connection information containing negotiated protocol version, cipher suite, and the hostname of SNI extension. - Info will be a proplists containing all the connection information on success, otherwise <c>{error, Reason}</c> will be returned.</p> + <desc><p>Returns the most relevant information about the connection, ssl options that + are undefined will be filtered out. Note that values that affect the security of the + connection will only be returned if explicitly requested by connection_information/2.</p> </desc> </func> <func> <name>connection_information(SslSocket, Items) -> - {ok, Info} | {error, Reason} </name> + {ok, Result} | {error, Reason} </name> <fsummary>Returns the requested connection information. </fsummary> <type> - <v>Items = [Item]</v> - <v>Item = protocol | cipher_suite | sni_hostname</v> - <v>Info = [InfoTuple]</v> - <v>InfoTuple = {protocol, Protocol} | {cipher_suite, CipherSuite} | {sni_hostname, SNIHostname}</v> - <v>CipherSuite = ciphersuite()</v> - <v>ProtocolVersion = protocol()</v> - <v>SNIHostname = string()</v> + <v>Items = [Item]</v> + <v>Item = protocol | cipher_suite | sni_hostname | ecc | session_id | client_random + | server_random | master_secret | atom()</v> + <d>Note that client_random, server_random and master_secret are values + that affect the security of connection. Meaningful atoms, not specified above, are the ssl option names.</d> + <v>Result = [{Item::atom(), Value::term()}]</v> <v>Reason = term()</v> </type> - <desc><p>Returns the connection information you requested. The connection information you can request contains protocol, cipher_suite, and sni_hostname. - <c>{ok, Info}</c> will be returned if it executes sucessfully. The Info is a proplists containing the information you requested. - Otherwise, <c>{error, Reason}</c> will be returned.</p> + <desc><p>Returns the requested information items about the connection, + if they are defined.</p> + <note><p>If only undefined options are requested the + resulting list can be empty.</p></note> </desc> </func> + <func> + <name>filter_cipher_suites(Suites, Filters) -> ciphers()</name> + <fsummary></fsummary> + <type> + <v> Suites = ciphers()</v> + <v> Filters = cipher_filters()</v> + </type> + <desc><p>Removes cipher suites if any of the filter functions + returns false for any part of the cipher suite. This function + also calls default filter functions to make sure the cipher + suites are supported by crypto. If no filter function is supplied for some + part the default behaviour is fun(Algorithm) -> true.</p> + </desc> + </func> + <func> <name>format_error(Reason) -> string()</name> <fsummary>Returns an error string.</fsummary> @@ -863,6 +1091,23 @@ fun(srp, Username :: string(), UserState :: term()) -> </func> <func> + <name>getstat(Socket) -> + {ok, OptionValues} | {error, inet:posix()}</name> + <name>getstat(Socket, OptionNames) -> + {ok, OptionValues} | {error, inet:posix()}</name> + <fsummary>Get one or more statistic options for a socket</fsummary> + <type> + <v>Socket = sslsocket()</v> + <v>OptionNames = [atom()]</v> + <v>OptionValues = [{inet:stat_option(), integer()}]</v> + </type> + <desc> + <p>Gets one or more statistic options for the underlying TCP socket.</p> + <p>See inet:getstat/2 for statistic options description.</p> + </desc> + </func> + + <func> <name>listen(Port, Options) -> {ok, ListenSocket} | {error, Reason}</name> <fsummary>Creates an SSL listen socket.</fsummary> @@ -917,6 +1162,22 @@ fun(srp, Username :: string(), UserState :: term()) -> <p>Returns the address and port number of the peer.</p> </desc> </func> + + <func> + <name>prepend_cipher_suites(Preferred, Suites) -> ciphers()</name> + <fsummary></fsummary> + <type> + <v>Preferred = ciphers() | cipher_filters() </v> + <v>Suites = ciphers() </v> + </type> + <desc><p>Make <c>Preferred</c> suites become the most preferred + suites that is put them at the head of the cipher suite list + <c>Suites</c> after removing them from <c>Suites</c> if + present. <c>Preferred</c> may be a list of cipher suits or a + list of filters in which case the filters are use on <c>Suites</c> to + extract the preferred cipher list. </p> + </desc> + </func> <func> <name>prf(Socket, Secret, Label, Seed, WantedLength) -> {ok, binary()} | {error, reason()}</name> @@ -1046,7 +1307,7 @@ fun(srp, Username :: string(), UserState :: term()) -> <fsummary>Performs server-side SSL/TLS handshake.</fsummary> <type> <v>Socket = socket() | sslsocket() </v> - <v>SslOptions = ssloptions()</v> + <v>SslOptions = [ssl_option()]</v> <v>Timeout = integer()</v> <v>Reason = term()</v> </type> @@ -1144,7 +1405,7 @@ fun(srp, Username :: string(), UserState :: term()) -> <fsummary>Returns version information relevant for the SSL application.</fsummary> <type> - <v>versions_info() = {app_vsn, string()} | {supported | available, [protocol()] </v> + <v>versions_info() = {app_vsn, string()} | {supported | available, [protocol_version()] </v> </type> <desc> <p>Returns version information relevant for the SSL @@ -1160,7 +1421,7 @@ fun(srp, Username :: string(), UserState :: term()) -> <seealso marker="#listen-2"> listen/2</seealso>, and <seealso marker="#ssl_accept-2">ssl_accept/[1,2,3]</seealso>. For the negotiated TLS/SSL version, see <seealso - marker="#connection_info-1">ssl:connection_info/1 + marker="#connection_information-1">ssl:connection_information/1 </seealso>.</item> <tag><c>available</c></tag> |