=================================================================== RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/ssh-agent.c,v retrieving revision 1.72 retrieving revision 1.72.2.2 diff -u -r1.72 -r1.72.2.2 --- src/usr.bin/ssh/ssh-agent.c 2001/08/03 10:31:30 1.72 +++ src/usr.bin/ssh/ssh-agent.c 2002/05/17 00:03:24 1.72.2.2 @@ -1,5 +1,3 @@ -/* $OpenBSD: ssh-agent.c,v 1.72 2001/08/03 10:31:30 jakob Exp $ */ - /* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland @@ -36,7 +34,8 @@ */ #include "includes.h" -RCSID("$OpenBSD: ssh-agent.c,v 1.72 2001/08/03 10:31:30 jakob Exp $"); +#include +RCSID("$OpenBSD: ssh-agent.c,v 1.72.2.2 2002/05/17 00:03:24 miod Exp $"); #include #include @@ -46,26 +45,25 @@ #include "buffer.h" #include "bufaux.h" #include "xmalloc.h" -#include "packet.h" #include "getput.h" -#include "mpaux.h" #include "key.h" #include "authfd.h" -#include "cipher.h" -#include "kex.h" #include "compat.h" #include "log.h" #ifdef SMARTCARD -#include #include "scard.h" #endif +typedef enum { + AUTH_UNUSED, + AUTH_SOCKET, + AUTH_CONNECTION +} sock_type; + typedef struct { int fd; - enum { - AUTH_UNUSED, AUTH_SOCKET, AUTH_CONNECTION - } type; + sock_type type; Buffer input; Buffer output; } SocketEntry; @@ -73,14 +71,15 @@ u_int sockets_alloc = 0; SocketEntry *sockets = NULL; -typedef struct { +typedef struct identity { + TAILQ_ENTRY(identity) next; Key *key; char *comment; } Identity; typedef struct { int nentries; - Identity *identities; + TAILQ_HEAD(idqueue, identity) idlist; } Idtab; /* private key table, one per protocol version */ @@ -101,8 +100,8 @@ idtab_init(void) { int i; - for (i = 0; i <=2; i++){ - idtable[i].identities = NULL; + for (i = 0; i <=2; i++) { + TAILQ_INIT(&idtable[i].idlist); idtable[i].nentries = 0; } } @@ -117,35 +116,40 @@ } /* return matching private key for given public key */ -static Key * -lookup_private_key(Key *key, int *idx, int version) +static Identity * +lookup_identity(Key *key, int version) { - int i; + Identity *id; + Idtab *tab = idtab_lookup(version); - for (i = 0; i < tab->nentries; i++) { - if (key_equal(key, tab->identities[i].key)) { - if (idx != NULL) - *idx = i; - return tab->identities[i].key; - } + TAILQ_FOREACH(id, &tab->idlist, next) { + if (key_equal(key, id->key)) + return (id); } - return NULL; + return (NULL); } +static void +free_identity(Identity *id) +{ + key_free(id->key); + xfree(id->comment); + xfree(id); +} + /* send list of supported public keys to 'client' */ static void process_request_identities(SocketEntry *e, int version) { Idtab *tab = idtab_lookup(version); Buffer msg; - int i; + Identity *id; buffer_init(&msg); buffer_put_char(&msg, (version == 1) ? SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); buffer_put_int(&msg, tab->nentries); - for (i = 0; i < tab->nentries; i++) { - Identity *id = &tab->identities[i]; + TAILQ_FOREACH(id, &tab->idlist, next) { if (id->key->type == KEY_RSA1) { buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); buffer_put_bignum(&msg, id->key->rsa->e); @@ -168,7 +172,8 @@ static void process_authentication_challenge1(SocketEntry *e) { - Key *key, *private; + Identity *id; + Key *key; BIGNUM *challenge; int i, len; Buffer msg; @@ -178,7 +183,8 @@ buffer_init(&msg); key = key_new(KEY_RSA1); - challenge = BN_new(); + if ((challenge = BN_new()) == NULL) + fatal("process_authentication_challenge1: BN_new failed"); buffer_get_int(&e->input); /* ignored */ buffer_get_bignum(&e->input, key->rsa->e); @@ -188,13 +194,14 @@ /* Only protocol 1.1 is supported */ if (buffer_len(&e->input) == 0) goto failure; - buffer_get(&e->input, (char *) session_id, 16); + buffer_get(&e->input, session_id, 16); response_type = buffer_get_int(&e->input); if (response_type != 1) goto failure; - private = lookup_private_key(key, NULL, 1); - if (private != NULL) { + id = lookup_identity(key, 1); + if (id != NULL) { + Key *private = id->key; /* Decrypt the challenge using the private key. */ if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) goto failure; @@ -235,7 +242,7 @@ process_sign_request2(SocketEntry *e) { extern int datafellows; - Key *key, *private; + Key *key; u_char *blob, *data, *signature = NULL; u_int blen, dlen, slen = 0; int flags; @@ -253,9 +260,9 @@ key = key_from_blob(blob, blen); if (key != NULL) { - private = lookup_private_key(key, NULL, 2); - if (private != NULL) - ok = key_sign(private, &signature, &slen, data, dlen); + Identity *id = lookup_identity(key, 2); + if (id != NULL) + ok = key_sign(id->key, &signature, &slen, data, dlen); } key_free(key); buffer_init(&msg); @@ -279,13 +286,13 @@ static void process_remove_identity(SocketEntry *e, int version) { - Key *key = NULL, *private; + Key *key = NULL; u_char *blob; u_int blen; u_int bits; int success = 0; - switch(version){ + switch (version) { case 1: key = key_new(KEY_RSA1); bits = buffer_get_int(&e->input); @@ -303,9 +310,8 @@ break; } if (key != NULL) { - int idx; - private = lookup_private_key(key, &idx, version); - if (private != NULL) { + Identity *id = lookup_identity(key, version); + if (id != NULL) { /* * We have this key. Free the old key. Since we * don\'t want to leave empty slots in the middle of @@ -314,19 +320,12 @@ * of the array. */ Idtab *tab = idtab_lookup(version); - key_free(tab->identities[idx].key); - xfree(tab->identities[idx].comment); if (tab->nentries < 1) fatal("process_remove_identity: " "internal error: tab->nentries %d", tab->nentries); - if (idx != tab->nentries - 1) { - int i; - for (i = idx; i < tab->nentries - 1; i++) - tab->identities[i] = tab->identities[i+1]; - } - tab->identities[tab->nentries - 1].key = NULL; - tab->identities[tab->nentries - 1].comment = NULL; + TAILQ_REMOVE(&tab->idlist, id, next); + free_identity(id); tab->nentries--; success = 1; } @@ -340,13 +339,14 @@ static void process_remove_all_identities(SocketEntry *e, int version) { - u_int i; Idtab *tab = idtab_lookup(version); + Identity *id; /* Loop over all identities and clear the keys. */ - for (i = 0; i < tab->nentries; i++) { - key_free(tab->identities[i].key); - xfree(tab->identities[i].comment); + for (id = TAILQ_FIRST(&tab->idlist); id; + id = TAILQ_FIRST(&tab->idlist)) { + TAILQ_REMOVE(&tab->idlist, id, next); + free_identity(id); } /* Mark that there are no identities. */ @@ -387,7 +387,7 @@ type_name = buffer_get_string(&e->input, NULL); type = key_type_from_name(type_name); xfree(type_name); - switch(type) { + switch (type) { case KEY_DSA: k = key_new_private(type); buffer_get_bignum2(&e->input, k->dsa->p); @@ -420,14 +420,11 @@ goto send; } success = 1; - if (lookup_private_key(k, NULL, version) == NULL) { - if (tab->nentries == 0) - tab->identities = xmalloc(sizeof(Identity)); - else - tab->identities = xrealloc(tab->identities, - (tab->nentries + 1) * sizeof(Identity)); - tab->identities[tab->nentries].key = k; - tab->identities[tab->nentries].comment = comment; + if (lookup_identity(k, version) == NULL) { + Identity *id = xmalloc(sizeof(Identity)); + id->key = k; + id->comment = comment; + TAILQ_INSERT_TAIL(&tab->idlist, id, next); /* Increment the number of identities. */ tab->nentries++; } else { @@ -445,56 +442,39 @@ static void process_add_smartcard_key (SocketEntry *e) { + Identity *id; Idtab *tab; - Key *n = NULL, *k = NULL; - char *sc_reader_id = NULL; - int success = 0; - + Key **keys, *k; + char *sc_reader_id = NULL, *pin; + int i, version, success = 0; + sc_reader_id = buffer_get_string(&e->input, NULL); - k = sc_get_key(sc_reader_id); + pin = buffer_get_string(&e->input, NULL); + keys = sc_get_keys(sc_reader_id, pin); xfree(sc_reader_id); + xfree(pin); - if (k == NULL) { - error("sc_get_pubkey failed"); + if (keys == NULL || keys[0] == NULL) { + error("sc_get_keys failed"); goto send; } - success = 1; - - tab = idtab_lookup(1); - k->type = KEY_RSA1; - if (lookup_private_key(k, NULL, 1) == NULL) { - if (tab->nentries == 0) - tab->identities = xmalloc(sizeof(Identity)); - else - tab->identities = xrealloc(tab->identities, - (tab->nentries + 1) * sizeof(Identity)); - n = key_new(KEY_RSA1); - BN_copy(n->rsa->n, k->rsa->n); - BN_copy(n->rsa->e, k->rsa->e); - RSA_set_method(n->rsa, sc_get_engine()); - tab->identities[tab->nentries].key = n; - tab->identities[tab->nentries].comment = - xstrdup("rsa1 smartcard"); - tab->nentries++; + for (i = 0; keys[i] != NULL; i++) { + k = keys[i]; + version = k->type == KEY_RSA1 ? 1 : 2; + tab = idtab_lookup(version); + if (lookup_identity(k, version) == NULL) { + id = xmalloc(sizeof(Identity)); + id->key = k; + id->comment = xstrdup("smartcard key"); + TAILQ_INSERT_TAIL(&tab->idlist, id, next); + tab->nentries++; + success = 1; + } else { + key_free(k); + } + keys[i] = NULL; } - k->type = KEY_RSA; - tab = idtab_lookup(2); - if (lookup_private_key(k, NULL, 2) == NULL) { - if (tab->nentries == 0) - tab->identities = xmalloc(sizeof(Identity)); - else - tab->identities = xrealloc(tab->identities, - (tab->nentries + 1) * sizeof(Identity)); - n = key_new(KEY_RSA); - BN_copy(n->rsa->n, k->rsa->n); - BN_copy(n->rsa->e, k->rsa->e); - RSA_set_method(n->rsa, sc_get_engine()); - tab->identities[tab->nentries].key = n; - tab->identities[tab->nentries].comment = - xstrdup("rsa smartcard"); - tab->nentries++; - } - key_free(k); + xfree(keys); send: buffer_put_int(&e->output, 1); buffer_put_char(&e->output, @@ -504,43 +484,37 @@ static void process_remove_smartcard_key(SocketEntry *e) { - Key *k = NULL, *private; - int idx; - int success = 0; - char *sc_reader_id = NULL; + Identity *id; + Idtab *tab; + Key **keys, *k = NULL; + char *sc_reader_id = NULL, *pin; + int i, version, success = 0; sc_reader_id = buffer_get_string(&e->input, NULL); - k = sc_get_key(sc_reader_id); + pin = buffer_get_string(&e->input, NULL); + keys = sc_get_keys(sc_reader_id, pin); xfree(sc_reader_id); + xfree(pin); - if (k == NULL) { - error("sc_get_pubkey failed"); - } else { - k->type = KEY_RSA1; - private = lookup_private_key(k, &idx, 1); - if (private != NULL) { - Idtab *tab = idtab_lookup(1); - key_free(tab->identities[idx].key); - xfree(tab->identities[idx].comment); - if (idx != tab->nentries) - tab->identities[idx] = tab->identities[tab->nentries]; + if (keys == NULL || keys[0] == NULL) { + error("sc_get_keys failed"); + goto send; + } + for (i = 0; keys[i] != NULL; i++) { + k = keys[i]; + version = k->type == KEY_RSA1 ? 1 : 2; + if ((id = lookup_identity(k, version)) != NULL) { + tab = idtab_lookup(version); + TAILQ_REMOVE(&tab->idlist, id, next); tab->nentries--; + free_identity(id); success = 1; } - k->type = KEY_RSA; - private = lookup_private_key(k, &idx, 2); - if (private != NULL) { - Idtab *tab = idtab_lookup(2); - key_free(tab->identities[idx].key); - xfree(tab->identities[idx].comment); - if (idx != tab->nentries) - tab->identities[idx] = tab->identities[tab->nentries]; - tab->nentries--; - success = 1; - } key_free(k); + keys[i] = NULL; } - + xfree(keys); +send: buffer_put_int(&e->output, 1); buffer_put_char(&e->output, success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); @@ -557,7 +531,7 @@ u_char *cp; if (buffer_len(&e->input) < 5) return; /* Incomplete message. */ - cp = (u_char *) buffer_ptr(&e->input); + cp = buffer_ptr(&e->input); msg_len = GET_32BIT(cp); if (msg_len > 256 * 1024) { shutdown(e->fd, SHUT_RDWR); @@ -607,10 +581,10 @@ #ifdef SMARTCARD case SSH_AGENTC_ADD_SMARTCARD_KEY: process_add_smartcard_key(e); - break; + break; case SSH_AGENTC_REMOVE_SMARTCARD_KEY: process_remove_smartcard_key(e); - break; + break; #endif /* SMARTCARD */ default: /* Unknown message. Respond with failure. */ @@ -623,7 +597,7 @@ } static void -new_socket(int type, int fd) +new_socket(sock_type type, int fd) { u_int i, old_alloc; if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) @@ -724,7 +698,8 @@ sock = accept(sockets[i].fd, (struct sockaddr *) &sunaddr, &slen); if (sock < 0) { - perror("accept from AUTH_SOCKET"); + error("accept from AUTH_SOCKET: %s", + strerror(errno)); break; } new_socket(AUTH_CONNECTION, sock); @@ -778,7 +753,7 @@ } static void -cleanup_socket(void) +cleanup_socket(void *p) { if (socket_name[0]) unlink(socket_name); @@ -789,14 +764,14 @@ static void cleanup_exit(int i) { - cleanup_socket(); + cleanup_socket(NULL); exit(i); } static void cleanup_handler(int sig) { - cleanup_socket(); + cleanup_socket(NULL); _exit(2); } @@ -870,7 +845,7 @@ if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) usage(); - if (ac == 0 && !c_flag && !k_flag && !s_flag && !d_flag) { + if (ac == 0 && !c_flag && !s_flag) { shell = getenv("SHELL"); if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) c_flag = 1; @@ -945,7 +920,7 @@ pid = fork(); if (pid == -1) { perror("fork"); - exit(1); + cleanup_exit(1); } if (pid != 0) { /* Parent - execute the given command. */ close(sock); @@ -968,9 +943,11 @@ perror(av[0]); exit(1); } + /* child */ + log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); if (setsid() == -1) { - perror("setsid"); + error("setsid: %s", strerror(errno)); cleanup_exit(1); } @@ -982,15 +959,12 @@ /* deny core dumps, since memory contains unencrypted private keys */ rlim.rlim_cur = rlim.rlim_max = 0; if (setrlimit(RLIMIT_CORE, &rlim) < 0) { - perror("setrlimit rlimit_core failed"); + error("setrlimit RLIMIT_CORE: %s", strerror(errno)); cleanup_exit(1); } skip: - if (atexit(cleanup_socket) < 0) { - perror("atexit"); - cleanup_exit(1); - } + fatal_add_cleanup(cleanup_socket, NULL); new_socket(AUTH_SOCKET, sock); if (ac > 0) { signal(SIGALRM, check_parent_exists); @@ -1009,7 +983,7 @@ if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { if (errno == EINTR) continue; - exit(1); + fatal("select: %s", strerror(errno)); } after_select(readsetp, writesetp); }