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Diffstat (limited to 'libotr/libotr-4.1.1/src/auth.h')
| -rw-r--r-- | libotr/libotr-4.1.1/src/auth.h | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/libotr/libotr-4.1.1/src/auth.h b/libotr/libotr-4.1.1/src/auth.h new file mode 100644 index 0000000..0b9db54 --- /dev/null +++ b/libotr/libotr-4.1.1/src/auth.h @@ -0,0 +1,177 @@ +/* + * Off-the-Record Messaging library + * Copyright (C) 2004-2012 Ian Goldberg, Rob Smits, Chris Alexander, + * Willy Lew, Lisa Du, Nikita Borisov + * <otr@cypherpunks.ca> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of version 2.1 of the GNU Lesser General + * Public License as published by the Free Software Foundation. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef __AUTH_H__ +#define __AUTH_H__ + +#include <gcrypt.h> +#include <time.h> +#include "dh.h" + + +typedef enum { + OTRL_AUTHSTATE_NONE, + OTRL_AUTHSTATE_AWAITING_DHKEY, + OTRL_AUTHSTATE_AWAITING_REVEALSIG, + OTRL_AUTHSTATE_AWAITING_SIG, + OTRL_AUTHSTATE_V1_SETUP +} OtrlAuthState; + +typedef struct { + OtrlAuthState authstate; /* Our state */ + + struct context *context; /* The context which points to us */ + + DH_keypair our_dh; /* Our D-H key */ + unsigned int our_keyid; /* ...and its keyid */ + + unsigned char *encgx; /* The encrypted value of g^x */ + size_t encgx_len; /* ...and its length */ + unsigned char r[16]; /* The encryption key */ + + unsigned char hashgx[32]; /* SHA256(g^x) */ + + gcry_mpi_t their_pub; /* Their D-H public key */ + unsigned int their_keyid; /* ...and its keyid */ + + + gcry_cipher_hd_t enc_c, enc_cp; /* c and c' encryption keys */ + gcry_md_hd_t mac_m1, mac_m1p; /* m1 and m1' MAC keys */ + gcry_md_hd_t mac_m2, mac_m2p; /* m2 and m2' MAC keys */ + + unsigned char their_fingerprint[20]; /* The fingerprint of their + long-term signing key */ + + int initiated; /* Did we initiate this + authentication? */ + + unsigned int protocol_version; /* The protocol version number + used to authenticate. */ + + unsigned char secure_session_id[20]; /* The secure session id */ + size_t secure_session_id_len; /* And its actual length, + which may be either 20 (for + v1) or 8 (for v2) */ + OtrlSessionIdHalf session_id_half; /* Which half of the session + id gets shown in bold */ + + char *lastauthmsg; /* The last auth message + (base-64 encoded) we sent, + in case we need to + retransmit it. */ + + time_t commit_sent_time; /* The time we last sent the + lastauthmsg, if it was a + COMMIT message, and this is + a master context. 0 + otherwise. */ +} OtrlAuthInfo; + +#include "privkey-t.h" + +/* + * Initialize the fields of an OtrlAuthInfo (already allocated). + */ +void otrl_auth_new(struct context *context); + +/* + * Clear the fields of an OtrlAuthInfo (but leave it allocated). + */ +void otrl_auth_clear(OtrlAuthInfo *auth); + +/* + * Start a fresh AKE (version 2 or 3) using the given OtrlAuthInfo. Generate + * a fresh DH keypair to use. If no error is returned, the message to + * transmit will be contained in auth->lastauthmsg. + */ +gcry_error_t otrl_auth_start_v23(OtrlAuthInfo *auth, int version); + +/* + * Handle an incoming D-H Commit Message. If no error is returned, the + * message to send will be left in auth->lastauthmsg. Generate a fresh + * keypair to use. + */ +gcry_error_t otrl_auth_handle_commit(OtrlAuthInfo *auth, + const char *commitmsg, int version); + +/* + * Handle an incoming D-H Key Message. If no error is returned, and + * *havemsgp is 1, the message to sent will be left in auth->lastauthmsg. + * Use the given private authentication key to sign messages. + */ +gcry_error_t otrl_auth_handle_key(OtrlAuthInfo *auth, const char *keymsg, + int *havemsgp, OtrlPrivKey *privkey); + +/* + * Handle an incoming Reveal Signature Message. If no error is + * returned, and *havemsgp is 1, the message to be sent will be left in + * auth->lastauthmsg. Use the given private authentication key to sign + * messages. Call the auth_succeeded callback if authentication is + * successful. + */ +gcry_error_t otrl_auth_handle_revealsig(OtrlAuthInfo *auth, + const char *revealmsg, int *havemsgp, OtrlPrivKey *privkey, + gcry_error_t (*auth_succeeded)(const OtrlAuthInfo *auth, void *asdata), + void *asdata); + +/* + * Handle an incoming Signature Message. If no error is returned, and + * *havemsgp is 1, the message to be sent will be left in + * auth->lastauthmsg. Call the auth_succeeded callback if + * authentication is successful. + */ +gcry_error_t otrl_auth_handle_signature(OtrlAuthInfo *auth, + const char *sigmsg, int *havemsgp, + gcry_error_t (*auth_succeeded)(const OtrlAuthInfo *auth, void *asdata), + void *asdata); + +/* + * Start a fresh AKE (version 1) using the given OtrlAuthInfo. If + * our_dh is NULL, generate a fresh DH keypair to use. Otherwise, use a + * copy of the one passed (with the given keyid). Use the given private + * key to sign the message. If no error is returned, the message to + * transmit will be contained in auth->lastauthmsg. + */ +gcry_error_t otrl_auth_start_v1(OtrlAuthInfo *auth, DH_keypair *our_dh, + unsigned int our_keyid, OtrlPrivKey *privkey); + +/* + * Handle an incoming v1 Key Exchange Message. If no error is returned, + * and *havemsgp is 1, the message to be sent will be left in + * auth->lastauthmsg. Use the given private authentication key to sign + * messages. Call the auth_secceeded callback if authentication is + * successful. If non-NULL, use a copy of the given D-H keypair, with + * the given keyid. + */ +gcry_error_t otrl_auth_handle_v1_key_exchange(OtrlAuthInfo *auth, + const char *keyexchmsg, int *havemsgp, OtrlPrivKey *privkey, + DH_keypair *our_dh, unsigned int our_keyid, + gcry_error_t (*auth_succeeded)(const OtrlAuthInfo *auth, void *asdata), + void *asdata); + +/* + * Copy relevant information from the master OtrlAuthInfo to an + * instance OtrlAuthInfo in response to a D-H Key with a new + * instance. The fields copied will depend on the state of the + * master auth. + */ +void otrl_auth_copy_on_key(OtrlAuthInfo *m_auth, OtrlAuthInfo *auth); + +#endif |