1 /* 2 * Author: Tatu Ylonen <ylo@cs.hut.fi> 3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 4 * All rights reserved 5 * Functions to interface with the SSH_AUTHENTICATION_FD socket. 6 * 7 * As far as I am concerned, the code I have written for this software 8 * can be used freely for any purpose. Any derived versions of this 9 * software must be clearly marked as such, and if the derived work is 10 * incompatible with the protocol description in the RFC file, it must be 11 * called by a name other than "ssh" or "Secure Shell". 12 */ 13 14 /* RCSID("$OpenBSD: authfd.h,v 1.13 2000/10/09 21:51:00 markus Exp $"); */ 15 16 #ifndef AUTHFD_H 17 #define AUTHFD_H 18 19 #include "buffer.h" 20 21 /* Messages for the authentication agent connection. */ 22 #define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1 23 #define SSH_AGENT_RSA_IDENTITIES_ANSWER 2 24 #define SSH_AGENTC_RSA_CHALLENGE 3 25 #define SSH_AGENT_RSA_RESPONSE 4 26 #define SSH_AGENT_FAILURE 5 27 #define SSH_AGENT_SUCCESS 6 28 #define SSH_AGENTC_ADD_RSA_IDENTITY 7 29 #define SSH_AGENTC_REMOVE_RSA_IDENTITY 8 30 #define SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9 31 32 /* private OpenSSH extensions for SSH2 */ 33 #define SSH2_AGENTC_REQUEST_IDENTITIES 11 34 #define SSH2_AGENT_IDENTITIES_ANSWER 12 35 #define SSH2_AGENTC_SIGN_REQUEST 13 36 #define SSH2_AGENT_SIGN_RESPONSE 14 37 #define SSH2_AGENTC_ADD_IDENTITY 17 38 #define SSH2_AGENTC_REMOVE_IDENTITY 18 39 #define SSH2_AGENTC_REMOVE_ALL_IDENTITIES 19 40 41 /* additional error code for ssh.com's ssh-agent2 */ 42 #define SSH_COM_AGENT2_FAILURE 102 43 44 #define SSH_AGENT_OLD_SIGNATURE 0x01 45 46 47 typedef struct { 48 int fd; 49 Buffer identities; 50 int howmany; 51 } AuthenticationConnection; 52 53 /* Returns the number of the authentication fd, or -1 if there is none. */ 54 int ssh_get_authentication_socket(); 55 56 /* 57 * This should be called for any descriptor returned by 58 * ssh_get_authentication_socket(). Depending on the way the descriptor was 59 * obtained, this may close the descriptor. 60 */ 61 void ssh_close_authentication_socket(int authfd); 62 63 /* 64 * Opens and connects a private socket for communication with the 65 * authentication agent. Returns NULL if an error occurred and the 66 * connection could not be opened. The connection should be closed by the 67 * caller by calling ssh_close_authentication_connection(). 68 */ 69 AuthenticationConnection *ssh_get_authentication_connection(); 70 71 /* 72 * Closes the connection to the authentication agent and frees any associated 73 * memory. 74 */ 75 void ssh_close_authentication_connection(AuthenticationConnection *auth); 76 77 /* 78 * Returns the first authentication identity held by the agent or NULL if 79 * no identies are available. Caller must free comment and key. 80 * Note that you cannot mix calls with different versions. 81 */ 82 Key *ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version); 83 84 /* 85 * Returns the next authentication identity for the agent. Other functions 86 * can be called between this and ssh_get_first_identity or two calls of this 87 * function. This returns NULL if there are no more identities. The caller 88 * must free key and comment after a successful return. 89 */ 90 Key *ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version); 91 92 /* 93 * Requests the agent to decrypt the given challenge. Returns true if the 94 * agent claims it was able to decrypt it. 95 */ 96 int 97 ssh_decrypt_challenge(AuthenticationConnection *auth, 98 Key *key, BIGNUM * challenge, 99 unsigned char session_id[16], 100 unsigned int response_type, 101 unsigned char response[16]); 102 103 /* Requests the agent to sign data using key */ 104 int 105 ssh_agent_sign(AuthenticationConnection *auth, 106 Key *key, 107 unsigned char **sigp, int *lenp, 108 unsigned char *data, int datalen); 109 110 /* 111 * Adds an identity to the authentication server. This call is not meant to 112 * be used by normal applications. This returns true if the identity was 113 * successfully added. 114 */ 115 int 116 ssh_add_identity(AuthenticationConnection *auth, Key *key, 117 const char *comment); 118 119 /* 120 * Removes the identity from the authentication server. This call is not 121 * meant to be used by normal applications. This returns true if the 122 * identity was successfully added. 123 */ 124 int ssh_remove_identity(AuthenticationConnection *auth, Key *key); 125 126 /* 127 * Removes all identities from the authentication agent. This call is not 128 * meant to be used by normal applications. This returns true if the 129 * operation was successful. 130 */ 131 int ssh_remove_all_identities(AuthenticationConnection *auth, int version); 132 133 #endif /* AUTHFD_H */ 134