o ]A@sdZddlZddlZddlZddlZddlZddlZddlZddl Zddl Zddl Zddl Zddl mZmZmZddl mZdZdZdZdZd Zd Zejjd d d dddZejjdZejjddZGdddeZGddde Z!Gddde!Z"dS)ag Parsing for `Tor Ed25519 certificates `_, which are used to for a variety of purposes... * validating the key used to sign server descriptors * validating the key used to sign hidden service v3 descriptors * signing and encrypting hidden service v3 indroductory points .. versionadded:: 1.6.0 **Module Overview:** :: Ed25519Certificate - Ed25519 signing key certificate | +- Ed25519CertificateV1 - version 1 Ed25519 certificate | |- is_expired - checks if certificate is presently expired | |- signing_key - certificate signing key | +- validate - validates a descriptor's signature | |- from_base64 - decodes a base64 encoded certificate |- to_base64 - base64 encoding of this certificate | |- unpack - decodes a byte encoded certificate +- pack - byte encoding of this certificate Ed25519Extension - extension included within an Ed25519Certificate .. data:: CertType (enum) Purpose of Ed25519 certificate. For more information see... * `cert-spec.txt `_ section A.1 * `rend-spec-v3.txt `_ appendix E .. deprecated:: 1.8.0 Replaced with :data:`stem.client.datatype.CertType` ======================== =========== CertType Description ======================== =========== **SIGNING** signing key with an identity key **LINK_CERT** TLS link certificate signed with ed25519 signing key **AUTH** authentication key signed with ed25519 signing key **HS_V3_DESC_SIGNING** hidden service v3 short-term descriptor signing key **HS_V3_INTRO_AUTH** hidden service v3 introductory point authentication key **HS_V3_INTRO_ENCRYPT** hidden service v3 introductory point encryption key ======================== =========== .. data:: ExtensionType (enum) Recognized exception types. ==================== =========== ExtensionType Description ==================== =========== **HAS_SIGNING_KEY** includes key used to sign the certificate ==================== =========== .. data:: ExtensionFlag (enum) Flags that can be assigned to Ed25519 certificate extensions. ====================== =========== ExtensionFlag Description ====================== =========== **AFFECTS_VALIDATION** extension affects whether the certificate is valid **UNKNOWN** extension includes flags not yet recognized by stem ====================== =========== N)FieldSizesplit)CertType (@s"Tor router descriptor signature v1s#Tor onion service descriptor sig v36ZSIGNINGZ LINK_CERTZAUTHZHS_V3_DESC_SIGNINGZHS_V3_INTRO_AUTHZHS_V3_INTRO_ENCRYPT)HAS_SIGNING_KEYAFFECTS_VALIDATIONUNKNOWNc@s4eZdZdZddZddZeddZdd Zd S) Ed25519Extensiona Extension within an Ed25519 certificate. :var stem.descriptor.certificate.ExtensionType type: extension type :var list flags: extension attribute flags :var int flag_int: integer encoding of the extension attribute flags :var bytes data: data the extension concerns cCs||_g|_|r |nd|_||_|r#|ddkr#|jtj|d8}|r,|jtj|tj kr?t |dkrAt dt |dSdS)Nrrz?Ed25519 HAS_SIGNING_KEY extension must be 32 bytes, but was %i.) typeflagsflag_intdataappend ExtensionFlagr r ExtensionTyper len ValueError)selfext_typeZflag_valrr=/usr/lib/python3/dist-packages/stem/descriptor/certificate.py__init__szEd25519Extension.__init__cCsRt}|tjt|j7}|tj|j7}|tj|j7}||j7}t |SN) bytearrayrSHORTpackrrCHARrrbytes)rencodedrrrr"s  zEd25519Extension.packcCst|dkr tdtj|\}}tj|\}}tj|\}}t||\}}t||kr9td|t|ft||||fS)Nr z*Ed25519 extension is missing header fieldszTEd25519 extension is truncated. It should have %i bytes of data but there's only %i.)rrrr!popr#rr)content data_sizerrrrrrr&s  zEd25519Extension.popcCstjj|dddddS)NrrrT)cache)stemutilZ _hash_attrrrrr__hash__szEd25519Extension.__hash__N) __name__ __module__ __qualname____doc__rr" staticmethodr&r-rrrrrvs   rc@sbeZdZdZddZeddZeddZdd Zdd d Z ed dZ ddZ eddZ dS)Ed25519Certificatez Base class for an Ed25519 certificate. :var int version: certificate format version :var unicode encoded: base64 encoded ed25519 certificate cCs||_d|_dSr)versionr%)rr4rrrrs zEd25519Certificate.__init__cCs.tj|d}|dkrt|Std|)a  Parses a byte encoded ED25519 certificate. :param bytes content: encoded certificate :returns: :class:`~stem.descriptor.certificate.Ed25519Certificate` subclsss for the given certificate :raises: **ValueError** if certificate is malformed rrzLEd25519 certificate is version %i. Parser presently only supports version 1.)rr#r&Ed25519CertificateV1unpackr)r'r4rrrr6s   zEd25519Certificate.unpackc Cstjj|}|dr|dr|dd}zt|}|s#tdt |}||_ |WStt j fyD}ztd||fd}~ww)a Parses a base64 encoded ED25519 certificate. :param str content: base64 encoded certificate :returns: :class:`~stem.descriptor.certificate.Ed25519Certificate` subclsss for the given certificate :raises: **ValueError** if content is malformed z-----BEGIN ED25519 CERT----- z -----END ED25519 CERT-----iemptyz`_, for more information see `RFC 7468 `_ :returns: **unicode** for our encoded certificate representation  rs:-----BEGIN ED25519 CERT----- %s -----END ED25519 CERT-----) joinr*r+r9Z_split_by_lengthr=Z b64encoder"r:)rpemr%rrr to_base64s zEd25519Certificate.to_base64csfdd}|S)NcsD|d\}}}|r|dkrtd|ft|t|dS)Nrz ED25519 CERTz='%s' should be followed by a ED25519 CERT block, but was a %s)rsetattrr3rD) descriptorentriesvalueZ block_typeZblock_contents attributekeywordrr_parses z3Ed25519Certificate._from_descriptor.._parser)rPrOrQrrNr_from_descriptorsz#Ed25519Certificate._from_descriptorcCs |jddS)NT)rH)rIr,rrr__str__s zEd25519Certificate.__str__cCs t|Sr)r3rD)r'rrrparses zEd25519Certificate.parseN)F) r.r/r0r1rr2r6rDr"rIrRrSrTrrrrr3s     r3csbeZdZdZdfdd ZddZeddZd d Zd d Z d dZ eddZ ddZ Z S)r5a Version 1 Ed25519 certificate, which are used for signing tor server descriptors. :var stem.client.datatype.CertType type: certificate purpose :var int type_int: integer value of the certificate purpose :var datetime expiration: expiration of the certificate :var int key_type: format of the key :var bytes key: key content :var list extensions: :class:`~stem.descriptor.certificate.Ed25519Extension` in this certificate :var bytes signature: certificate signature :param bytes signature: pre-calculated certificate signature :param cryptography.hazmat.primitives.asymmetric.ed25519.Ed25519PrivateKey signing_key: certificate signing key Nc s"tt|d|durtd|durtdt|\|_|_|r%|n tj tj t d|_ |r5|nd|_ tj||_|rC|ng|_||_|rf||}|jrc|j|krctd||jf||_|jtjtjtjfvrxtd|j|jtjkrtd|jtjkrtd|jdS) NrzCertificate type is requiredzCertificate key is required)Zhoursz6Signature calculated from its key (%s) mismatches '%s'zOEd25519 certificate cannot have a type of %i. 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Supported descriptor types include... * :class:`~stem.descriptor.server_descriptor.RelayDescriptor` * :class:`~stem.descriptor.hidden_service.HiddenServiceDescriptorV3` :param stem.descriptor.__init__.Descriptor descriptor: descriptor to validate :raises: * **ValueError** if signing key or descriptor are invalid * **TypeError** if descriptor type is unsupported * **ImportError** if cryptography module or ed25519 support unavailable T)Zed25519zKCertificate validation requires the cryptography module and ed25519 supportzWCertificate validation only supported for server and hidden service descriptors, not %srEd25519PublicKeyInvalidSignaturezNDescriptor Ed25519 certificate signature invalid (signature forged or corrupt)N) r*ZprereqZis_crypto_available ImportError isinstancerKserver_descriptorRelayDescriptorhashlibZsha256r5_signed_contentZdigestr+r9Z _decode_b64Zed25519_signature!_validate_server_desc_signing_keyhidden_serviceHiddenServiceDescriptorV3r_r?rr.1cryptography.hazmat.primitives.asymmetric.ed25519rqcryptography.exceptionsrsfrom_public_bytesr]verifyr)rrKZsigned_contentr_rqrsr]rrrvalidates$      zEd25519CertificateV1.validatecCstt|tjjjr t}d}nt|tjjjrt}d}n t dt |j t ||t j}|s3t d||dS)zu Provides this descriptor's signing constant, appended with the portion of the descriptor that's signed. s(.+router-sig-ed25519 )s(.+)signature zBUG: %s type unexpectedz+Malformed descriptor missing signature liner)rur*rKrvrwSIG_PREFIX_SERVER_DESCr{r|SIG_PREFIX_HS_V3rrr.researchZ get_bytesDOTALLgroup)rKprefixZregexmatchrrrrysz$Ed25519CertificateV1._signed_contentcCsddlm}ddlm}|jrttjj |jd}n| }|s't dz| |}||jttjj |jdt WdS|yOt dw)Nrrprr=z0Server descriptor missing an ed25519 signing keyzJEd25519KeyCertificate signing key is invalid (signature forged or corrupt))r}rqr~rsZed25519_master_keyr=r>r*r+r9Z _to_bytesrbrrrr_r%rj)rrKrqrsrbr]rrrrzs   0 z6Ed25519CertificateV1._validate_server_desc_signing_key)NNNNNNN)r.r/r0r1rr"r2r6rorbrryrz __classcell__rrrcrr5s   ' r5)#r1r=r@rYrxrZstem.descriptor.hidden_servicer*Z!stem.descriptor.server_descriptorZ stem.prereqZ stem.utilZstem.util.enumZstem.util.str_toolsZstem.client.datatyperrrrrVrkrirjrrrZr+enumZ UppercaseEnumEnumrrrobjectr3r5rrrrsBH  5m