=================================================================== RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/ssh-agent.c,v retrieving revision 1.37 retrieving revision 1.37.2.6 diff -u -r1.37 -r1.37.2.6 --- src/usr.bin/ssh/ssh-agent.c 2000/09/21 11:07:51 1.37 +++ src/usr.bin/ssh/ssh-agent.c 2002/03/08 17:04:43 1.37.2.6 @@ -1,5 +1,3 @@ -/* $OpenBSD: ssh-agent.c,v 1.37 2000/09/21 11:07:51 markus Exp $ */ - /* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland @@ -12,8 +10,7 @@ * incompatible with the protocol description in the RFC file, it must be * called by a name other than "ssh" or "Secure Shell". * - * SSH2 implementation, - * Copyright (c) 2000 Markus Friedl. All rights reserved. + * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -37,47 +34,53 @@ */ #include "includes.h" -RCSID("$OpenBSD: ssh-agent.c,v 1.37 2000/09/21 11:07:51 markus Exp $"); +#include +RCSID("$OpenBSD: ssh-agent.c,v 1.37.2.6 2002/03/08 17:04:43 brad Exp $"); +#include +#include + #include "ssh.h" #include "rsa.h" #include "buffer.h" #include "bufaux.h" #include "xmalloc.h" -#include "packet.h" #include "getput.h" -#include "mpaux.h" - -#include -#include -#include -#include #include "key.h" #include "authfd.h" -#include "dsa.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; -unsigned int sockets_alloc = 0; +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 */ @@ -94,18 +97,18 @@ extern char *__progname; -void +static void 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; } } /* return private key table for requested protocol version */ -Idtab * +static Idtab * idtab_lookup(int version) { if (version < 1 || version > 2) @@ -114,43 +117,48 @@ } /* return matching private key for given public key */ -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' */ -void +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]; - if (id->key->type == KEY_RSA) { + 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); buffer_put_bignum(&msg, id->key->rsa->n); } else { - unsigned char *blob; - unsigned int blen; - dsa_make_key_blob(id->key, &blob, &blen); + u_char *blob; + u_int blen; + key_to_blob(id->key, &blob, &blen); buffer_put_string(&msg, blob, blen); xfree(blob); } @@ -162,20 +170,22 @@ } /* ssh1 only */ -void +static void process_authentication_challenge1(SocketEntry *e) { - Key *key, *private; + Identity *id; + Key *key; BIGNUM *challenge; int i, len; Buffer msg; MD5_CTX md; - unsigned char buf[32], mdbuf[16], session_id[16]; - unsigned int response_type; + u_char buf[32], mdbuf[16], session_id[16]; + u_int response_type; buffer_init(&msg); - key = key_new(KEY_RSA); - challenge = BN_new(); + key = key_new(KEY_RSA1); + 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); @@ -185,15 +195,17 @@ /* 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. */ - rsa_private_decrypt(challenge, challenge, private->rsa); + if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) + goto failure; /* The response is MD5 of decrypted challenge plus session id. */ len = BN_num_bytes(challenge); @@ -227,19 +239,19 @@ } /* ssh2 only */ -void +static void process_sign_request2(SocketEntry *e) { extern int datafellows; - Key *key, *private; - unsigned char *blob, *data, *signature = NULL; - unsigned int blen, dlen, slen = 0; + Key *key; + u_char *blob, *data, *signature = NULL; + u_int blen, dlen, slen = 0; int flags; Buffer msg; int ok = -1; datafellows = 0; - + blob = buffer_get_string(&e->input, &blen); data = buffer_get_string(&e->input, &dlen); @@ -247,11 +259,11 @@ if (flags & SSH_AGENT_OLD_SIGNATURE) datafellows = SSH_BUG_SIGBLOB; - key = dsa_key_from_blob(blob, blen); + key = key_from_blob(blob, blen); if (key != NULL) { - private = lookup_private_key(key, NULL, 2); - if (private != NULL) - ok = dsa_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); @@ -272,47 +284,49 @@ } /* shared */ -void +static void process_remove_identity(SocketEntry *e, int version) { - Key *key = NULL, *private; - unsigned char *blob; - unsigned int blen; - unsigned int bits; + 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_RSA); + key = key_new(KEY_RSA1); bits = buffer_get_int(&e->input); buffer_get_bignum(&e->input, key->rsa->e); buffer_get_bignum(&e->input, key->rsa->n); if (bits != key_size(key)) log("Warning: identity keysize mismatch: actual %d, announced %d", - key_size(key), bits); + key_size(key), bits); break; case 2: blob = buffer_get_string(&e->input, &blen); - key = dsa_key_from_blob(blob, blen); + key = key_from_blob(blob, blen); xfree(blob); 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 - * the array, we actually free the key there and copy - * data from the last entry. + * the array, we actually free the key there and move + * all the entries between the empty slot and the end + * of the array. */ Idtab *tab = idtab_lookup(version); - key_free(tab->identities[idx].key); - xfree(tab->identities[idx].comment); - if (idx != tab->nentries) - tab->identities[idx] = tab->identities[tab->nentries]; + if (tab->nentries < 1) + fatal("process_remove_identity: " + "internal error: tab->nentries %d", + tab->nentries); + TAILQ_REMOVE(&tab->idlist, id, next); + free_identity(id); tab->nentries--; success = 1; } @@ -323,16 +337,17 @@ success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); } -void +static void process_remove_all_identities(SocketEntry *e, int version) { - unsigned 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. */ @@ -344,94 +359,73 @@ return; } -void +static void process_add_identity(SocketEntry *e, int version) { Key *k = NULL; - RSA *rsa; - BIGNUM *aux; - BN_CTX *ctx; - char *type; + char *type_name; char *comment; - int success = 0; + int type, success = 0; Idtab *tab = idtab_lookup(version); switch (version) { case 1: - k = key_new(KEY_RSA); - rsa = k->rsa; + k = key_new_private(KEY_RSA1); + buffer_get_int(&e->input); /* ignored */ + buffer_get_bignum(&e->input, k->rsa->n); + buffer_get_bignum(&e->input, k->rsa->e); + buffer_get_bignum(&e->input, k->rsa->d); + buffer_get_bignum(&e->input, k->rsa->iqmp); - /* allocate mem for private key */ - /* XXX rsa->n and rsa->e are already allocated */ - rsa->d = BN_new(); - rsa->iqmp = BN_new(); - rsa->q = BN_new(); - rsa->p = BN_new(); - rsa->dmq1 = BN_new(); - rsa->dmp1 = BN_new(); - - buffer_get_int(&e->input); /* ignored */ - - buffer_get_bignum(&e->input, rsa->n); - buffer_get_bignum(&e->input, rsa->e); - buffer_get_bignum(&e->input, rsa->d); - buffer_get_bignum(&e->input, rsa->iqmp); - /* SSH and SSL have p and q swapped */ - buffer_get_bignum(&e->input, rsa->q); /* p */ - buffer_get_bignum(&e->input, rsa->p); /* q */ + buffer_get_bignum(&e->input, k->rsa->q); /* p */ + buffer_get_bignum(&e->input, k->rsa->p); /* q */ /* Generate additional parameters */ - aux = BN_new(); - ctx = BN_CTX_new(); - - BN_sub(aux, rsa->q, BN_value_one()); - BN_mod(rsa->dmq1, rsa->d, aux, ctx); - - BN_sub(aux, rsa->p, BN_value_one()); - BN_mod(rsa->dmp1, rsa->d, aux, ctx); - - BN_clear_free(aux); - BN_CTX_free(ctx); - + rsa_generate_additional_parameters(k->rsa); break; case 2: - type = buffer_get_string(&e->input, NULL); - if (strcmp(type, KEX_DSS)) { + type_name = buffer_get_string(&e->input, NULL); + type = key_type_from_name(type_name); + xfree(type_name); + switch (type) { + case KEY_DSA: + k = key_new_private(type); + buffer_get_bignum2(&e->input, k->dsa->p); + buffer_get_bignum2(&e->input, k->dsa->q); + buffer_get_bignum2(&e->input, k->dsa->g); + buffer_get_bignum2(&e->input, k->dsa->pub_key); + buffer_get_bignum2(&e->input, k->dsa->priv_key); + break; + case KEY_RSA: + k = key_new_private(type); + buffer_get_bignum2(&e->input, k->rsa->n); + buffer_get_bignum2(&e->input, k->rsa->e); + buffer_get_bignum2(&e->input, k->rsa->d); + buffer_get_bignum2(&e->input, k->rsa->iqmp); + buffer_get_bignum2(&e->input, k->rsa->p); + buffer_get_bignum2(&e->input, k->rsa->q); + + /* Generate additional parameters */ + rsa_generate_additional_parameters(k->rsa); + break; + default: buffer_clear(&e->input); - xfree(type); goto send; } - xfree(type); - - k = key_new(KEY_DSA); - - /* allocate mem for private key */ - k->dsa->priv_key = BN_new(); - - buffer_get_bignum2(&e->input, k->dsa->p); - buffer_get_bignum2(&e->input, k->dsa->q); - buffer_get_bignum2(&e->input, k->dsa->g); - buffer_get_bignum2(&e->input, k->dsa->pub_key); - buffer_get_bignum2(&e->input, k->dsa->priv_key); - break; } - comment = buffer_get_string(&e->input, NULL); if (k == NULL) { xfree(comment); 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 { @@ -444,17 +438,112 @@ success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); } + +#ifdef SMARTCARD +static void +process_add_smartcard_key (SocketEntry *e) +{ + Idtab *tab; + Key *n = NULL, *k = NULL; + char *sc_reader_id = NULL; + int success = 0; + + sc_reader_id = buffer_get_string(&e->input, NULL); + k = sc_get_key(sc_reader_id); + xfree(sc_reader_id); + + if (k == NULL) { + error("sc_get_pubkey failed"); + goto send; + } + success = 1; + + tab = idtab_lookup(1); + k->type = KEY_RSA1; + if (lookup_identity(k, 1) == NULL) { + Identity *id = xmalloc(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()); + id->key = n; + id->comment = xstrdup("rsa1 smartcard"); + TAILQ_INSERT_TAIL(&tab->idlist, id, next); + tab->nentries++; + } + k->type = KEY_RSA; + tab = idtab_lookup(2); + if (lookup_identity(k, 2) == NULL) { + Identity *id = xmalloc(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()); + id->key = n; + id->comment = xstrdup("rsa smartcard"); + TAILQ_INSERT_TAIL(&tab->idlist, id, next); + tab->nentries++; + } + key_free(k); +send: + buffer_put_int(&e->output, 1); + buffer_put_char(&e->output, + success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); +} + +static void +process_remove_smartcard_key(SocketEntry *e) +{ + Key *k = NULL; + int success = 0; + char *sc_reader_id = NULL; + + sc_reader_id = buffer_get_string(&e->input, NULL); + k = sc_get_key(sc_reader_id); + xfree(sc_reader_id); + + if (k == NULL) { + error("sc_get_pubkey failed"); + } else { + Identity *id; + k->type = KEY_RSA1; + id = lookup_identity(k, 1); + if (id != NULL) { + Idtab *tab = idtab_lookup(1); + TAILQ_REMOVE(&tab->idlist, id, next); + free_identity(id); + tab->nentries--; + success = 1; + } + k->type = KEY_RSA; + id = lookup_identity(k, 2); + if (id != NULL) { + Idtab *tab = idtab_lookup(2); + TAILQ_REMOVE(&tab->idlist, id, next); + free_identity(id); + tab->nentries--; + success = 1; + } + key_free(k); + } + + buffer_put_int(&e->output, 1); + buffer_put_char(&e->output, + success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); +} +#endif /* SMARTCARD */ + /* dispatch incoming messages */ -void +static void process_message(SocketEntry *e) { - unsigned int msg_len; - unsigned int type; - unsigned char *cp; + u_int msg_len; + u_int type; + u_char *cp; if (buffer_len(&e->input) < 5) return; /* Incomplete message. */ - cp = (unsigned 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); @@ -467,6 +556,7 @@ buffer_consume(&e->input, 4); type = buffer_get_char(&e->input); + debug("type %d", type); switch (type) { /* ssh1 */ case SSH_AGENTC_RSA_CHALLENGE: @@ -500,6 +590,14 @@ case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: process_remove_all_identities(e, 2); break; +#ifdef SMARTCARD + case SSH_AGENTC_ADD_SMARTCARD_KEY: + process_add_smartcard_key(e); + break; + case SSH_AGENTC_REMOVE_SMARTCARD_KEY: + process_remove_smartcard_key(e); + break; +#endif /* SMARTCARD */ default: /* Unknown message. Respond with failure. */ error("Unknown message %d", type); @@ -510,10 +608,10 @@ } } -void -new_socket(int type, int fd) +static void +new_socket(sock_type type, int fd) { - unsigned int i, old_alloc; + u_int i, old_alloc; if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) error("fcntl O_NONBLOCK: %s", strerror(errno)); @@ -542,17 +640,17 @@ buffer_init(&sockets[old_alloc].output); } -void -prepare_select(fd_set *readset, fd_set *writeset) +static int +prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, int *nallocp) { - unsigned int i; - for (i = 0; i < sockets_alloc; i++) + u_int i, sz; + int n = 0; + + for (i = 0; i < sockets_alloc; i++) { switch (sockets[i].type) { case AUTH_SOCKET: case AUTH_CONNECTION: - FD_SET(sockets[i].fd, readset); - if (buffer_len(&sockets[i].output) > 0) - FD_SET(sockets[i].fd, writeset); + n = MAX(n, sockets[i].fd); break; case AUTH_UNUSED: break; @@ -560,12 +658,43 @@ fatal("Unknown socket type %d", sockets[i].type); break; } + } + + sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); + if (*fdrp == NULL || sz > *nallocp) { + if (*fdrp) + xfree(*fdrp); + if (*fdwp) + xfree(*fdwp); + *fdrp = xmalloc(sz); + *fdwp = xmalloc(sz); + *nallocp = sz; + } + if (n < *fdl) + debug("XXX shrink: %d < %d", n, *fdl); + *fdl = n; + memset(*fdrp, 0, sz); + memset(*fdwp, 0, sz); + + for (i = 0; i < sockets_alloc; i++) { + switch (sockets[i].type) { + case AUTH_SOCKET: + case AUTH_CONNECTION: + FD_SET(sockets[i].fd, *fdrp); + if (buffer_len(&sockets[i].output) > 0) + FD_SET(sockets[i].fd, *fdwp); + break; + default: + break; + } + } + return (1); } -void +static void after_select(fd_set *readset, fd_set *writeset) { - unsigned int i; + u_int i; int len, sock; socklen_t slen; char buf[1024]; @@ -578,9 +707,11 @@ case AUTH_SOCKET: if (FD_ISSET(sockets[i].fd, readset)) { slen = sizeof(sunaddr); - sock = accept(sockets[i].fd, (struct sockaddr *) & sunaddr, &slen); + 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); @@ -589,8 +720,15 @@ case AUTH_CONNECTION: if (buffer_len(&sockets[i].output) > 0 && FD_ISSET(sockets[i].fd, writeset)) { - len = write(sockets[i].fd, buffer_ptr(&sockets[i].output), - buffer_len(&sockets[i].output)); + do { + len = write(sockets[i].fd, + buffer_ptr(&sockets[i].output), + buffer_len(&sockets[i].output)); + if (len == -1 && (errno == EAGAIN || + errno == EINTR)) + continue; + break; + } while (1); if (len <= 0) { shutdown(sockets[i].fd, SHUT_RDWR); close(sockets[i].fd); @@ -602,7 +740,13 @@ buffer_consume(&sockets[i].output, len); } if (FD_ISSET(sockets[i].fd, readset)) { - len = read(sockets[i].fd, buf, sizeof(buf)); + do { + len = read(sockets[i].fd, buf, sizeof(buf)); + if (len == -1 && (errno == EAGAIN || + errno == EINTR)) + continue; + break; + } while (1); if (len <= 0) { shutdown(sockets[i].fd, SHUT_RDWR); close(sockets[i].fd); @@ -620,57 +764,70 @@ } } -void -check_parent_exists(int sig) +static void +cleanup_socket(void *p) { - if (parent_pid != -1 && kill(parent_pid, 0) < 0) { - /* printf("Parent has died - Authentication agent exiting.\n"); */ - exit(1); - } - signal(SIGALRM, check_parent_exists); - alarm(10); + if (socket_name[0]) + unlink(socket_name); + if (socket_dir[0]) + rmdir(socket_dir); } -void -cleanup_socket(void) +static void +cleanup_exit(int i) { - remove(socket_name); - rmdir(socket_dir); + cleanup_socket(NULL); + exit(i); } -void -cleanup_exit(int i) +static void +cleanup_handler(int sig) { - cleanup_socket(); - exit(i); + cleanup_socket(NULL); + _exit(2); } -void -usage() +static void +check_parent_exists(int sig) { - fprintf(stderr, "ssh-agent version %s\n", SSH_VERSION); - fprintf(stderr, "Usage: %s [-c | -s] [-k] [command {args...]]\n", - __progname); + int save_errno = errno; + + if (parent_pid != -1 && kill(parent_pid, 0) < 0) { + /* printf("Parent has died - Authentication agent exiting.\n"); */ + cleanup_handler(sig); /* safe */ + } + signal(SIGALRM, check_parent_exists); + alarm(10); + errno = save_errno; +} + +static void +usage(void) +{ + fprintf(stderr, "Usage: %s [options] [command [args ...]]\n", + __progname); + fprintf(stderr, "Options:\n"); + fprintf(stderr, " -c Generate C-shell commands on stdout.\n"); + fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n"); + fprintf(stderr, " -k Kill the current agent.\n"); + fprintf(stderr, " -d Debug mode.\n"); exit(1); } int main(int ac, char **av) { - fd_set readset, writeset; - int sock, c_flag = 0, k_flag = 0, s_flag = 0, ch; + int sock, c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0, ch, nalloc; struct sockaddr_un sunaddr; + struct rlimit rlim; pid_t pid; char *shell, *format, *pidstr, pidstrbuf[1 + 3 * sizeof pid]; + extern int optind; + fd_set *readsetp = NULL, *writesetp = NULL; - /* check if RSA support exists */ - if (rsa_alive() == 0) { - fprintf(stderr, - "%s: no RSA support in libssl and libcrypto. See ssl(8).\n", - __progname); - exit(1); - } - while ((ch = getopt(ac, av, "cks")) != -1) { + SSLeay_add_all_algorithms(); + + while ((ch = getopt(ac, av, "cdks")) != -1) { switch (ch) { case 'c': if (s_flag) @@ -685,6 +842,11 @@ usage(); s_flag++; break; + case 'd': + if (d_flag) + usage(); + d_flag++; + break; default: usage(); } @@ -692,10 +854,10 @@ ac -= optind; av += optind; - if (ac > 0 && (c_flag || k_flag || s_flag)) + if (ac > 0 && (c_flag || k_flag || s_flag || d_flag)) usage(); - if (ac == 0 && !c_flag && !k_flag && !s_flag) { + if (ac == 0 && !c_flag && !k_flag && !s_flag && !d_flag) { shell = getenv("SHELL"); if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) c_flag = 1; @@ -704,14 +866,13 @@ pidstr = getenv(SSH_AGENTPID_ENV_NAME); if (pidstr == NULL) { fprintf(stderr, "%s not set, cannot kill agent\n", - SSH_AGENTPID_ENV_NAME); + SSH_AGENTPID_ENV_NAME); exit(1); } pid = atoi(pidstr); - if (pid < 1) { /* XXX PID_MAX check too */ - /* Yes, PID_MAX check please */ + if (pid < 1) { fprintf(stderr, "%s=\"%s\", which is not a good PID\n", - SSH_AGENTPID_ENV_NAME, pidstr); + SSH_AGENTPID_ENV_NAME, pidstr); exit(1); } if (kill(pid, SIGTERM) == -1) { @@ -733,7 +894,7 @@ exit(1); } snprintf(socket_name, sizeof socket_name, "%s/agent.%d", socket_dir, - parent_pid); + parent_pid); /* * Create socket early so it will exist before command gets run from @@ -755,14 +916,23 @@ perror("listen"); cleanup_exit(1); } + /* * Fork, and have the parent execute the command, if any, or present * the socket data. The child continues as the authentication agent. */ + if (d_flag) { + log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1); + format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; + printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, + SSH_AUTHSOCKET_ENV_NAME); + printf("echo Agent pid %d;\n", parent_pid); + goto skip; + } pid = fork(); if (pid == -1) { perror("fork"); - exit(1); + cleanup_exit(1); } if (pid != 0) { /* Parent - execute the given command. */ close(sock); @@ -770,9 +940,9 @@ if (ac == 0) { format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, - SSH_AUTHSOCKET_ENV_NAME); + SSH_AUTHSOCKET_ENV_NAME); printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, - SSH_AGENTPID_ENV_NAME); + SSH_AGENTPID_ENV_NAME); printf("echo Agent pid %d;\n", pid); exit(0); } @@ -785,38 +955,49 @@ perror(av[0]); exit(1); } + /* child */ + log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); + + if (setsid() == -1) { + error("setsid: %s", strerror(errno)); + cleanup_exit(1); + } + + (void)chdir("/"); close(0); close(1); close(2); - if (setsid() == -1) { - perror("setsid"); + /* deny core dumps, since memory contains unencrypted private keys */ + rlim.rlim_cur = rlim.rlim_max = 0; + if (setrlimit(RLIMIT_CORE, &rlim) < 0) { + error("setrlimit RLIMIT_CORE: %s", strerror(errno)); cleanup_exit(1); } - if (atexit(cleanup_socket) < 0) { - perror("atexit"); - cleanup_exit(1); - } + +skip: + fatal_add_cleanup(cleanup_socket, NULL); new_socket(AUTH_SOCKET, sock); if (ac > 0) { signal(SIGALRM, check_parent_exists); alarm(10); } idtab_init(); - signal(SIGINT, SIG_IGN); + if (!d_flag) + signal(SIGINT, SIG_IGN); signal(SIGPIPE, SIG_IGN); - signal(SIGHUP, cleanup_exit); - signal(SIGTERM, cleanup_exit); + signal(SIGHUP, cleanup_handler); + signal(SIGTERM, cleanup_handler); + nalloc = 0; + while (1) { - FD_ZERO(&readset); - FD_ZERO(&writeset); - prepare_select(&readset, &writeset); - if (select(max_fd + 1, &readset, &writeset, NULL, NULL) < 0) { + prepare_select(&readsetp, &writesetp, &max_fd, &nalloc); + if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { if (errno == EINTR) continue; - exit(1); + fatal("select: %s", strerror(errno)); } - after_select(&readset, &writeset); + after_select(readsetp, writesetp); } /* NOTREACHED */ }