src/message_api.h
author Neal H. Walfield <neal@pep.foundation>
Wed, 08 May 2019 12:20:37 +0200
branchemail_comparison
changeset 3649 1dd837adc30b
parent 3475 71e0a8ae558f
child 3723 59c62bbfbd57
child 3743 a66f640552a4
permissions -rw-r--r--
Fix public key.
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// This file is under GNU General Public License 3.0
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// see LICENSE.txt
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#pragma once
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#include "pEpEngine.h"
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#include "keymanagement.h"
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#include "message.h"
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#include "cryptotech.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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bool import_attached_keys(
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        PEP_SESSION session, 
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        message *msg,
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        identity_list **private_idents
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    );
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void attach_own_key(PEP_SESSION session, message *msg);
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PEP_cryptotech determine_encryption_format(message *msg);
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void add_opt_field(message *msg, const char *name, const char *value);
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typedef enum _PEP_encrypt_flags {
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    // "default" means whatever the default behaviour for the function is.
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    PEP_encrypt_flag_default = 0x0,
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    PEP_encrypt_flag_force_encryption = 0x1,
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    // This flag is for special use cases and should not be used
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    // by normal pEp clients!
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    PEP_encrypt_flag_force_unsigned = 0x2,
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    PEP_encrypt_flag_force_no_attached_key = 0x4,
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    // This is used for outer messages (used to wrap the real message)
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    // This is only used internally and (eventually) by transport functions
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    PEP_encrypt_flag_inner_message = 0x8,
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    // This is mainly used by pEp clients to send private keys to 
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    // their own PGP-only device
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    PEP_encrypt_flag_force_version_1 = 0x10,
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    PEP_encrypt_flag_key_reset_only = 0x20
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} PEP_encrypt_flags; 
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typedef unsigned int PEP_encrypt_flags_t;
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typedef enum _message_wrap_type {
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    PEP_message_default,    // typical inner/outer message 2.0
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    PEP_message_transport,  // e.g. for onion layers
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    PEP_message_key_reset   // for wrapped key reset information
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} message_wrap_type;
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// encrypt_message() - encrypt message in memory
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//
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//  parameters:
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//      session (in)        session handle
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//      src (inout)         message to encrypt - usually in-only, but can be 
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//                          in-out for unencrypted messages; in that case, 
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//                          we may attach the key and decorate the message
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//      extra (in)          extra keys for encryption
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//      dst (out)           pointer to new encrypted message or NULL if no
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//                          encryption could take place
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//      enc_format (in)     encrypted format
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//      flags (in)          flags to set special encryption features
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//
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//  return value:
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//      PEP_STATUS_OK                   on success
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//      PEP_KEY_HAS_AMBIG_NAME          at least one of the receipient keys has
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//                                      an ambiguous name
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//      PEP_UNENCRYPTED                 on demand or no recipients with usable
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//                                      key, is left unencrypted, and key is
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//                                      attached to it
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//
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//  caveat:
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//      the ownership of src remains with the caller
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//      the ownership of dst goes to the caller
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DYNAMIC_API PEP_STATUS encrypt_message(
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        PEP_SESSION session,
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        message *src,
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        stringlist_t *extra,
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        message **dst,
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        PEP_enc_format enc_format,
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        PEP_encrypt_flags_t flags
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    );
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// encrypt_message_and_add_priv_key() - encrypt message in memory, adding an encrypted private
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//                                      key (encrypted separately and sent within the inner message)
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//
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//  parameters:
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//      session (in)        session handle
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//      src (in)            message to encrypt
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//      dst (out)           pointer to new encrypted message or NULL if no
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//                          encryption could take place
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//      to_fpr              fingerprint of the recipient key to which the private key
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//                          should be encrypted
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//      enc_format (in)     encrypted format
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//      flags (in)          flags to set special encryption features
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//
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//  return value:
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//      PEP_STATUS_OK                   on success
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//      PEP_KEY_HAS_AMBIG_NAME          at least one of the receipient keys has
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//                                      an ambiguous name
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//      PEP_UNENCRYPTED                 on demand or no recipients with usable
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//                                      key, is left unencrypted, and key is
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//                                      attached to it
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//
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//  caveat:
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//      the ownershop of src remains with the caller
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//      the ownership of dst goes to the caller
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DYNAMIC_API PEP_STATUS encrypt_message_and_add_priv_key(
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        PEP_SESSION session,
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        message *src,
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        message **dst,
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        const char* to_fpr,
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        PEP_enc_format enc_format,
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        PEP_encrypt_flags_t flags
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    );
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// encrypt_message_for_self() - encrypt message in memory for user's identity only,
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//                              ignoring recipients and other identities from
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//                              the message
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//  parameters:
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//      session (in)        session handle
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//      target_id (in)      self identity this message should be encrypted for
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//      src (in)            message to encrypt
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//      extra (in)          extra keys for encryption
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//      dst (out)           pointer to new encrypted message or NULL on failure
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//      enc_format (in)     encrypted format
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//      flags (in)          flags to set special encryption features
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//
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//  return value:       (FIXME: This may not be correct or complete)
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//      PEP_STATUS_OK            on success
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//      PEP_KEY_NOT_FOUND        at least one of the receipient keys
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//                               could not be found
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//      PEP_KEY_HAS_AMBIG_NAME   at least one of the receipient keys has
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//                               an ambiguous name
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//      PEP_GET_KEY_FAILED       cannot retrieve key
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//
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//  caveat:
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//      the ownership of src remains with the caller
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//      the ownership of target_id remains w/ caller            
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//      the ownership of dst goes to the caller
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//      message is NOT encrypted for identities other than the target_id (and then,
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//      only if the target_id refers to self!)
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DYNAMIC_API PEP_STATUS encrypt_message_for_self(
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        PEP_SESSION session,
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        pEp_identity* target_id,
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        message *src,
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        stringlist_t* extra,
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        message **dst,
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        PEP_enc_format enc_format,
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        PEP_encrypt_flags_t flags
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    );
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typedef enum _PEP_rating {
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    PEP_rating_undefined = 0,
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    PEP_rating_cannot_decrypt,
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    PEP_rating_have_no_key,
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    PEP_rating_unencrypted,
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    PEP_rating_unencrypted_for_some, // don't use this any more
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    PEP_rating_unreliable,
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    PEP_rating_reliable,
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    PEP_rating_trusted,
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    PEP_rating_trusted_and_anonymized,
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    PEP_rating_fully_anonymous,   
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    PEP_rating_mistrust = -1,
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    PEP_rating_b0rken = -2,
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    PEP_rating_under_attack = -3
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} PEP_rating;
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typedef enum _PEP_color {
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    PEP_color_no_color = 0,
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    PEP_color_yellow,
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    PEP_color_green,
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    PEP_color_red = -1,
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} PEP_color;
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// color_from_rating - calculate color from rating
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//
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//  parameters:
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//      rating (in)         rating
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//
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//  return value:           color representing that rating
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DYNAMIC_API PEP_color color_from_rating(PEP_rating rating);
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typedef enum _PEP_decrypt_flags {
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    PEP_decrypt_flag_own_private_key = 0x1,
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    PEP_decrypt_flag_consume = 0x2,
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    PEP_decrypt_flag_ignore = 0x4,
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    PEP_decrypt_flag_src_modified = 0x8,
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    // input flags    
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    PEP_decrypt_flag_untrusted_server = 0x100,
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    PEP_decrypt_flag_dont_trigger_sync = 0x200,
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} PEP_decrypt_flags; 
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typedef unsigned int PEP_decrypt_flags_t;
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// decrypt_message() - decrypt message in memory
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//
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//  parameters:
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//      session (in)        session handle
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//      src (inout)         message to decrypt
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//      dst (out)           pointer to new decrypted message or NULL on failure
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//      keylist (inout)     in: stringlist with additional keyids for reencryption if needed
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//                              (will be freed and replaced with output keylist) 
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//                          out: stringlist with keyids used for signing and encryption. first
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//                               first key is signer, additional keys are the ones it was encrypted
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//                               to. Only signer and whichever of the user's keys was used are 
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//                               reliable
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//      rating (out)        rating for the message
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//      flags (inout)       flags to signal special decryption features
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//
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//  return value:
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//      error status 
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//      or PEP_DECRYPTED if message decrypted but not verified
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//      or PEP_CANNOT_REENCRYPT if message was decrypted (and possibly
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//         verified) but a reencryption operation is expected by the caller
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//         and failed
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//      or PEP_STATUS_OK on success
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//
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//  flag values:
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//      in:
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//          PEP_decrypt_flag_untrusted_server
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//              used to signal that decrypt function should engage in behaviour
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//              specified for when the server storing the source is untrusted
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//      out:
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//          PEP_decrypt_flag_own_private_key
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//              private key was imported for one of our addresses (NOT trusted
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//              or set to be used - handshake/trust is required for that)
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//          PEP_decrypt_flag_src_modified
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//              indicates that the src object has been modified. At the moment,
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//              this is always as a direct result of the behaviour driven
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//              by the input flags. This flag is the ONLY value that should be
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//              relied upon to see if such changes have taken place.
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//          PEP_decrypt_flag_consume
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//              used by sync 
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//          PEP_decrypt_flag_ignore
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//              used by sync 
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//
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//
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// caveat:
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//      the ownership of src remains with the caller - however, the contents 
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//          might be modified (strings freed and allocated anew or set to NULL,
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//          etc) intentionally; when this happens, PEP_decrypt_flag_src_modified
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//          is set.
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//      the ownership of dst goes to the caller
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//      the ownership of keylist goes to the caller
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//      if src is unencrypted this function returns PEP_UNENCRYPTED and sets
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//         dst to NULL
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DYNAMIC_API PEP_STATUS decrypt_message(
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        PEP_SESSION session,
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        message *src,
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        message **dst,
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        stringlist_t **keylist,
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        PEP_rating *rating,
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        PEP_decrypt_flags_t *flags
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);
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// own_message_private_key_details() - details on own key in own message
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//
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//  parameters:
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//      session (in)        session handle
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//      msg (in)            message to decrypt
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//      ident (out)         identity containing uid, address and fpr of key
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//
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//  note:
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//      In order to obtain details about key to be possibly imported
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//      as a replacement of key currently used as own identity, 
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//      application passes message that have been previously flagged by 
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//      decrypt_message() as own message containing own key to this function
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//
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//  return value:
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//      error status or PEP_STATUS_OK on success
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//
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//  caveat:
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//      the ownership of msg remains with the caller
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//      the ownership of ident goes to the caller
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//      msg MUST be encrypted so that this function can check own signature
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DYNAMIC_API PEP_STATUS own_message_private_key_details(
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        PEP_SESSION session,
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        message *msg,
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        pEp_identity **ident 
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);
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// outgoing_message_rating() - get rating for an outgoing message
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//
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//  parameters:
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//      session (in)        session handle
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//      msg (in)            message to get the rating for
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//      rating (out)        rating for the message
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//
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//  return value:
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//      error status or PEP_STATUS_OK on success
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//
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//  caveat:
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//      msg->from must point to a valid pEp_identity
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//      msg->dir must be PEP_dir_outgoing
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//      the ownership of msg remains with the caller
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DYNAMIC_API PEP_STATUS outgoing_message_rating(
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        PEP_SESSION session,
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        message *msg,
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        PEP_rating *rating
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    );
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// outgoing_message_rating_preview() - get rating preview
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//
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//  parameters:
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//      session (in)        session handle
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//      msg (in)            message to get the rating for
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//      rating (out)        rating preview for the message
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//
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//  return value:
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//      error status or PEP_STATUS_OK on success
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//
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//  caveat:
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//      msg->from must point to a valid pEp_identity
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//      msg->dir must be PEP_dir_outgoing
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//      the ownership of msg remains with the caller
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DYNAMIC_API PEP_STATUS outgoing_message_rating_preview(
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        PEP_SESSION session,
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        message *msg,
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        PEP_rating *rating
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    );
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// identity_rating() - get rating for a single identity
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//
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//  parameters:
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//      session (in)        session handle
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//      ident (in)          identity to get the rating for
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//      rating (out)        rating for the identity
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//
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//  return value:
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//      error status or PEP_STATUS_OK on success
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//
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//  caveat:
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//      the ownership of ident remains with the caller
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DYNAMIC_API PEP_STATUS identity_rating(
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        PEP_SESSION session,
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        pEp_identity *ident,
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        PEP_rating *rating
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    );
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// get_binary_path() - retrieve path of cryptotech binary if available
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//
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//  parameters:
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//      tech (in)           cryptotech to get the binary for
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//      path (out)          path to cryptotech binary or NULL if not available
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//                          **path is owned by the library, do not change it!
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DYNAMIC_API PEP_STATUS get_binary_path(PEP_cryptotech tech, const char **path);
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// get_trustwords() - get full trustwords string for a *pair* of identities
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//
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//    parameters:
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//        session (in)        session handle
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//        id1 (in)            identity of first party in communication - fpr can't be NULL  
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//        id2 (in)            identity of second party in communication - fpr can't be NULL
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//        lang (in)           C string with ISO 639-1 language code
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//        words (out)         pointer to C string with all trustwords UTF-8 encoded,
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//                            separated by a blank each
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//                            NULL if language is not supported or trustword
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//                            wordlist is damaged or unavailable
krista@1307
   376
//        wsize (out)         length of full trustwords string
krista@1307
   377
//        full (in)           if true, generate ALL trustwords for these identities.
krista@1307
   378
//                            else, generate a fixed-size subset. (TODO: fixed-minimum-entropy
krista@1307
   379
//                            subset in next version)
krista@1307
   380
//
krista@1307
   381
//    return value:
krista@1307
   382
//        PEP_STATUS_OK            trustwords retrieved
krista@1307
   383
//        PEP_OUT_OF_MEMORY        out of memory
krista@1307
   384
//        PEP_TRUSTWORD_NOT_FOUND  at least one trustword not found
krista@1307
   385
//
krista@1307
   386
//    caveat:
krista@1307
   387
//        the word pointer goes to the ownership of the caller
krista@1307
   388
//        the caller is responsible to free() it (on Windoze use pEp_free())
krista@1307
   389
//
krista@1307
   390
DYNAMIC_API PEP_STATUS get_trustwords(
roker@1509
   391
    PEP_SESSION session, const pEp_identity* id1, const pEp_identity* id2,
krista@1307
   392
    const char* lang, char **words, size_t *wsize, bool full
krista@1307
   393
);
vb@507
   394
roker@1869
   395
edouard@1553
   396
// get_message_trustwords() - get full trustwords string for message sender and reciever identities 
edouard@1553
   397
//
edouard@1553
   398
//    parameters:
edouard@1553
   399
//        session (in)        session handle
edouard@1553
   400
//        msg (in)            message to get sender identity from
edouard@1553
   401
//        keylist (in)        NULL if message to be decrypted,
edouard@1553
   402
//                            keylist returned by decrypt_message() otherwise
edouard@1553
   403
//        received_by (in)    identity for account receiving message can't be NULL
edouard@1553
   404
//        lang (in)           C string with ISO 639-1 language code
edouard@1553
   405
//        words (out)         pointer to C string with all trustwords UTF-8 encoded,
edouard@1553
   406
//                            separated by a blank each
edouard@1553
   407
//                            NULL if language is not supported or trustword
edouard@1553
   408
//                            wordlist is damaged or unavailable
edouard@1553
   409
//        full (in)           if true, generate ALL trustwords for these identities.
edouard@1553
   410
//                            else, generate a fixed-size subset. (TODO: fixed-minimum-entropy
edouard@1553
   411
//                            subset in next version)
edouard@1553
   412
//
edouard@1553
   413
//    return value:
edouard@1553
   414
//        PEP_STATUS_OK            trustwords retrieved
edouard@1553
   415
//        PEP_OUT_OF_MEMORY        out of memory
edouard@1553
   416
//        PEP_TRUSTWORD_NOT_FOUND  at least one trustword not found
edouard@1553
   417
//        error status of decrypt_message() if decryption fails.
edouard@1553
   418
//
edouard@1553
   419
//    caveat:
edouard@1553
   420
//        the word pointer goes to the ownership of the caller
edouard@1553
   421
//        the caller is responsible to free() it (on Windoze use pEp_free())
edouard@1553
   422
//
edouard@1553
   423
DYNAMIC_API PEP_STATUS get_message_trustwords(
edouard@1553
   424
    PEP_SESSION session, 
edouard@1553
   425
    message *msg,
edouard@1553
   426
    stringlist_t *keylist,
edouard@1553
   427
    pEp_identity* received_by,
edouard@1553
   428
    const char* lang, char **words, bool full
edouard@1553
   429
);
edouard@1553
   430
edouard@1815
   431
// re_evaluate_message_rating() - re-evaluate already decrypted message rating
edouard@1815
   432
//
edouard@1815
   433
//  parameters:
edouard@1815
   434
//      session (in)            session handle
edouard@1815
   435
//      msg (in)                message to get the rating for
edouard@1815
   436
//      x_keylist (in)          decrypted message recipients keys fpr
edouard@1815
   437
//      x_enc_status (in)       original rating for the decrypted message
edouard@1815
   438
//      rating (out)            rating for the message
edouard@1815
   439
//
edouard@1815
   440
//  return value:
edouard@1815
   441
//      PEP_ILLEGAL_VALUE       if decrypted message doesn't contain 
edouard@1815
   442
//                              X-EncStatus optional field and x_enc_status is 
edouard@1815
   443
//                              pEp_rating_udefined
edouard@1815
   444
//                              or if decrypted message doesn't contain 
edouard@1815
   445
//                              X-Keylist optional field and x_keylist is NULL
edouard@1815
   446
//      PEP_OUT_OF_MEMORY       if not enough memory could be allocated
edouard@1815
   447
//
edouard@1815
   448
//  caveat:
edouard@1815
   449
//      msg->from must point to a valid pEp_identity
edouard@1815
   450
//      the ownership of msg remains with the caller
edouard@1815
   451
//	    the ownership of x_keylist remains with to the caller
edouard@1815
   452
edouard@1815
   453
DYNAMIC_API PEP_STATUS re_evaluate_message_rating(
edouard@1815
   454
    PEP_SESSION session,
edouard@1815
   455
    message *msg,
edouard@1815
   456
    stringlist_t *x_keylist,
edouard@1815
   457
    PEP_rating x_enc_status,
edouard@1815
   458
    PEP_rating *rating
edouard@1815
   459
);
vb@3239
   460
vb@3243
   461
// get_key_rating_for_user() - get the rating of a certain key for a certain user
vb@3243
   462
//
vb@3243
   463
//  parameters:
vb@3243
   464
//
vb@3243
   465
//      session (in)            session handle
vb@3243
   466
//      user_id (in)            string with user ID
vb@3243
   467
//      fpr (in)                string with fingerprint
vb@3243
   468
//      rating (out)            rating of key for this user
vb@3243
   469
//
vb@3243
   470
//  returns:
vb@3243
   471
//      PEP_RECORD_NOT_FOUND if no trust record for user_id and fpr can be found
vb@3239
   472
vb@3239
   473
DYNAMIC_API PEP_STATUS get_key_rating_for_user(
vb@3239
   474
        PEP_SESSION session,
roker@3248
   475
        const char *user_id,
roker@3248
   476
        const char *fpr,
vb@3239
   477
        PEP_rating *rating
vb@3239
   478
    );
vb@3239
   479
vb@37
   480
#ifdef __cplusplus
vb@37
   481
}
vb@37
   482
#endif