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-rw-r--r--ssh-keyscan.c890
1 files changed, 890 insertions, 0 deletions
diff --git a/ssh-keyscan.c b/ssh-keyscan.c
new file mode 100644
index 0000000..1d2df70
--- /dev/null
+++ b/ssh-keyscan.c
@@ -0,0 +1,890 @@
+/* $OpenBSD: ssh-keyscan.c,v 1.153 2023/06/21 05:06:04 djm Exp $ */
+/*
+ * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
+ *
+ * Modification and redistribution in source and binary forms is
+ * permitted provided that due credit is given to the author and the
+ * OpenBSD project by leaving this copyright notice intact.
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+#include "openbsd-compat/sys-queue.h"
+#include <sys/resource.h>
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h>
+#endif
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#ifdef WITH_OPENSSL
+#include <openssl/bn.h>
+#endif
+
+#include <limits.h>
+#include <netdb.h>
+#include <errno.h>
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#endif
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "xmalloc.h"
+#include "ssh.h"
+#include "sshbuf.h"
+#include "sshkey.h"
+#include "cipher.h"
+#include "digest.h"
+#include "kex.h"
+#include "compat.h"
+#include "myproposal.h"
+#include "packet.h"
+#include "dispatch.h"
+#include "log.h"
+#include "atomicio.h"
+#include "misc.h"
+#include "hostfile.h"
+#include "ssherr.h"
+#include "ssh_api.h"
+#include "dns.h"
+#include "addr.h"
+
+/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
+ Default value is AF_UNSPEC means both IPv4 and IPv6. */
+int IPv4or6 = AF_UNSPEC;
+
+int ssh_port = SSH_DEFAULT_PORT;
+
+#define KT_DSA (1)
+#define KT_RSA (1<<1)
+#define KT_ECDSA (1<<2)
+#define KT_ED25519 (1<<3)
+#define KT_XMSS (1<<4)
+#define KT_ECDSA_SK (1<<5)
+#define KT_ED25519_SK (1<<6)
+
+#define KT_MIN KT_DSA
+#define KT_MAX KT_ED25519_SK
+
+int get_cert = 0;
+int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK;
+
+int hash_hosts = 0; /* Hash hostname on output */
+
+int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
+
+int found_one = 0; /* Successfully found a key */
+
+int hashalg = -1; /* Hash for SSHFP records or -1 for all */
+
+#define MAXMAXFD 256
+
+/* The number of seconds after which to give up on a TCP connection */
+int timeout = 5;
+
+int maxfd;
+#define MAXCON (maxfd - 10)
+
+extern char *__progname;
+struct pollfd *read_wait;
+int ncon;
+
+/*
+ * Keep a connection structure for each file descriptor. The state
+ * associated with file descriptor n is held in fdcon[n].
+ */
+typedef struct Connection {
+ u_char c_status; /* State of connection on this file desc. */
+#define CS_UNUSED 0 /* File descriptor unused */
+#define CS_CON 1 /* Waiting to connect/read greeting */
+#define CS_SIZE 2 /* Waiting to read initial packet size */
+#define CS_KEYS 3 /* Waiting to read public key packet */
+ int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
+ int c_plen; /* Packet length field for ssh packet */
+ int c_len; /* Total bytes which must be read. */
+ int c_off; /* Length of data read so far. */
+ int c_keytype; /* Only one of KT_* */
+ sig_atomic_t c_done; /* SSH2 done */
+ char *c_namebase; /* Address to free for c_name and c_namelist */
+ char *c_name; /* Hostname of connection for errors */
+ char *c_namelist; /* Pointer to other possible addresses */
+ char *c_output_name; /* Hostname of connection for output */
+ char *c_data; /* Data read from this fd */
+ struct ssh *c_ssh; /* SSH-connection */
+ struct timespec c_ts; /* Time at which connection gets aborted */
+ TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
+} con;
+
+TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
+con *fdcon;
+
+static void keyprint(con *c, struct sshkey *key);
+
+static int
+fdlim_get(int hard)
+{
+#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
+ struct rlimit rlfd;
+ rlim_t lim;
+
+ if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
+ return -1;
+ lim = hard ? rlfd.rlim_max : rlfd.rlim_cur;
+ if (lim <= 0)
+ return -1;
+ if (lim == RLIM_INFINITY)
+ lim = SSH_SYSFDMAX;
+ if (lim >= INT_MAX)
+ lim = INT_MAX;
+ return lim;
+#else
+ return (SSH_SYSFDMAX <= 0) ? -1 :
+ ((SSH_SYSFDMAX >= INT_MAX) ? INT_MAX : SSH_SYSFDMAX);
+#endif
+}
+
+static int
+fdlim_set(int lim)
+{
+#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
+ struct rlimit rlfd;
+#endif
+
+ if (lim <= 0)
+ return (-1);
+#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
+ if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
+ return (-1);
+ rlfd.rlim_cur = lim;
+ if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1)
+ return (-1);
+#elif defined (HAVE_SETDTABLESIZE)
+ setdtablesize(lim);
+#endif
+ return (0);
+}
+
+/*
+ * This is an strsep function that returns a null field for adjacent
+ * separators. This is the same as the 4.4BSD strsep, but different from the
+ * one in the GNU libc.
+ */
+static char *
+xstrsep(char **str, const char *delim)
+{
+ char *s, *e;
+
+ if (!**str)
+ return (NULL);
+
+ s = *str;
+ e = s + strcspn(s, delim);
+
+ if (*e != '\0')
+ *e++ = '\0';
+ *str = e;
+
+ return (s);
+}
+
+/*
+ * Get the next non-null token (like GNU strsep). Strsep() will return a
+ * null token for two adjacent separators, so we may have to loop.
+ */
+static char *
+strnnsep(char **stringp, char *delim)
+{
+ char *tok;
+
+ do {
+ tok = xstrsep(stringp, delim);
+ } while (tok && *tok == '\0');
+ return (tok);
+}
+
+
+static int
+key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
+{
+ con *c;
+
+ if ((c = ssh_get_app_data(ssh)) != NULL)
+ keyprint(c, hostkey);
+ /* always abort key exchange */
+ return -1;
+}
+
+static int
+ssh2_capable(int remote_major, int remote_minor)
+{
+ switch (remote_major) {
+ case 1:
+ if (remote_minor == 99)
+ return 1;
+ break;
+ case 2:
+ return 1;
+ default:
+ break;
+ }
+ return 0;
+}
+
+static void
+keygrab_ssh2(con *c)
+{
+ char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
+ int r;
+
+ switch (c->c_keytype) {
+ case KT_DSA:
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
+ "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
+ break;
+ case KT_RSA:
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
+ "rsa-sha2-512-cert-v01@openssh.com,"
+ "rsa-sha2-256-cert-v01@openssh.com,"
+ "ssh-rsa-cert-v01@openssh.com" :
+ "rsa-sha2-512,"
+ "rsa-sha2-256,"
+ "ssh-rsa";
+ break;
+ case KT_ED25519:
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
+ "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
+ break;
+ case KT_XMSS:
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
+ "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com";
+ break;
+ case KT_ECDSA:
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
+ "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
+ "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
+ "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
+ "ecdsa-sha2-nistp256,"
+ "ecdsa-sha2-nistp384,"
+ "ecdsa-sha2-nistp521";
+ break;
+ case KT_ECDSA_SK:
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
+ "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" :
+ "sk-ecdsa-sha2-nistp256@openssh.com";
+ break;
+ case KT_ED25519_SK:
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
+ "sk-ssh-ed25519-cert-v01@openssh.com" :
+ "sk-ssh-ed25519@openssh.com";
+ break;
+ default:
+ fatal("unknown key type %d", c->c_keytype);
+ break;
+ }
+ if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
+ free(c->c_ssh);
+ fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
+ exit(1);
+ }
+#ifdef WITH_OPENSSL
+ c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
+ c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
+ c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
+ c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
+ c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
+ c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
+ c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
+# ifdef OPENSSL_HAS_ECC
+ c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
+# endif
+#endif
+ c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
+ c->c_ssh->kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_client;
+ ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
+ /*
+ * do the key-exchange until an error occurs or until
+ * the key_print_wrapper() callback sets c_done.
+ */
+ ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
+}
+
+static void
+keyprint_one(const char *host, struct sshkey *key)
+{
+ char *hostport = NULL, *hashed = NULL;
+ const char *known_host;
+ int r = 0;
+
+ found_one = 1;
+
+ if (print_sshfp) {
+ export_dns_rr(host, key, stdout, 0, hashalg);
+ return;
+ }
+
+ hostport = put_host_port(host, ssh_port);
+ lowercase(hostport);
+ if (hash_hosts && (hashed = host_hash(hostport, NULL, 0)) == NULL)
+ fatal("host_hash failed");
+ known_host = hash_hosts ? hashed : hostport;
+ if (!get_cert)
+ r = fprintf(stdout, "%s ", known_host);
+ if (r >= 0 && sshkey_write(key, stdout) == 0)
+ (void)fputs("\n", stdout);
+ free(hashed);
+ free(hostport);
+}
+
+static void
+keyprint(con *c, struct sshkey *key)
+{
+ char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
+ char *host, *ohosts;
+
+ if (key == NULL)
+ return;
+ if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
+ keyprint_one(hosts, key);
+ return;
+ }
+ ohosts = hosts = xstrdup(hosts);
+ while ((host = strsep(&hosts, ",")) != NULL)
+ keyprint_one(host, key);
+ free(ohosts);
+}
+
+static int
+tcpconnect(char *host)
+{
+ struct addrinfo hints, *ai, *aitop;
+ char strport[NI_MAXSERV];
+ int gaierr, s = -1;
+
+ snprintf(strport, sizeof strport, "%d", ssh_port);
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = IPv4or6;
+ hints.ai_socktype = SOCK_STREAM;
+ if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
+ error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
+ return -1;
+ }
+ for (ai = aitop; ai; ai = ai->ai_next) {
+ s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+ if (s == -1) {
+ error("socket: %s", strerror(errno));
+ continue;
+ }
+ if (set_nonblock(s) == -1)
+ fatal_f("set_nonblock(%d)", s);
+ if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
+ errno != EINPROGRESS)
+ error("connect (`%s'): %s", host, strerror(errno));
+ else
+ break;
+ close(s);
+ s = -1;
+ }
+ freeaddrinfo(aitop);
+ return s;
+}
+
+static int
+conalloc(const char *iname, const char *oname, int keytype)
+{
+ char *namebase, *name, *namelist;
+ int s;
+
+ namebase = namelist = xstrdup(iname);
+
+ do {
+ name = xstrsep(&namelist, ",");
+ if (!name) {
+ free(namebase);
+ return (-1);
+ }
+ } while ((s = tcpconnect(name)) < 0);
+
+ if (s >= maxfd)
+ fatal("conalloc: fdno %d too high", s);
+ if (fdcon[s].c_status)
+ fatal("conalloc: attempt to reuse fdno %d", s);
+
+ debug3_f("oname %s kt %d", oname, keytype);
+ fdcon[s].c_fd = s;
+ fdcon[s].c_status = CS_CON;
+ fdcon[s].c_namebase = namebase;
+ fdcon[s].c_name = name;
+ fdcon[s].c_namelist = namelist;
+ fdcon[s].c_output_name = xstrdup(oname);
+ fdcon[s].c_data = (char *) &fdcon[s].c_plen;
+ fdcon[s].c_len = 4;
+ fdcon[s].c_off = 0;
+ fdcon[s].c_keytype = keytype;
+ monotime_ts(&fdcon[s].c_ts);
+ fdcon[s].c_ts.tv_sec += timeout;
+ TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
+ read_wait[s].fd = s;
+ read_wait[s].events = POLLIN;
+ ncon++;
+ return (s);
+}
+
+static void
+confree(int s)
+{
+ if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
+ fatal("confree: attempt to free bad fdno %d", s);
+ free(fdcon[s].c_namebase);
+ free(fdcon[s].c_output_name);
+ if (fdcon[s].c_status == CS_KEYS)
+ free(fdcon[s].c_data);
+ fdcon[s].c_status = CS_UNUSED;
+ fdcon[s].c_keytype = 0;
+ if (fdcon[s].c_ssh) {
+ ssh_packet_close(fdcon[s].c_ssh);
+ free(fdcon[s].c_ssh);
+ fdcon[s].c_ssh = NULL;
+ } else
+ close(s);
+ TAILQ_REMOVE(&tq, &fdcon[s], c_link);
+ read_wait[s].fd = -1;
+ read_wait[s].events = 0;
+ ncon--;
+}
+
+static void
+contouch(int s)
+{
+ TAILQ_REMOVE(&tq, &fdcon[s], c_link);
+ monotime_ts(&fdcon[s].c_ts);
+ fdcon[s].c_ts.tv_sec += timeout;
+ TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
+}
+
+static int
+conrecycle(int s)
+{
+ con *c = &fdcon[s];
+ int ret;
+
+ ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
+ confree(s);
+ return (ret);
+}
+
+static void
+congreet(int s)
+{
+ int n = 0, remote_major = 0, remote_minor = 0;
+ char buf[256], *cp;
+ char remote_version[sizeof buf];
+ size_t bufsiz;
+ con *c = &fdcon[s];
+
+ /* send client banner */
+ n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
+ PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
+ if (n < 0 || (size_t)n >= sizeof(buf)) {
+ error("snprintf: buffer too small");
+ confree(s);
+ return;
+ }
+ if (atomicio(vwrite, s, buf, n) != (size_t)n) {
+ error("write (%s): %s", c->c_name, strerror(errno));
+ confree(s);
+ return;
+ }
+
+ /*
+ * Read the server banner as per RFC4253 section 4.2. The "SSH-"
+ * protocol identification string may be preceeded by an arbitrarily
+ * large banner which we must read and ignore. Loop while reading
+ * newline-terminated lines until we have one starting with "SSH-".
+ * The ID string cannot be longer than 255 characters although the
+ * preceeding banner lines may (in which case they'll be discarded
+ * in multiple iterations of the outer loop).
+ */
+ for (;;) {
+ memset(buf, '\0', sizeof(buf));
+ bufsiz = sizeof(buf);
+ cp = buf;
+ while (bufsiz-- &&
+ (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
+ if (*cp == '\r')
+ *cp = '\n';
+ cp++;
+ }
+ if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
+ break;
+ }
+ if (n == 0) {
+ switch (errno) {
+ case EPIPE:
+ error("%s: Connection closed by remote host", c->c_name);
+ break;
+ case ECONNREFUSED:
+ break;
+ default:
+ error("read (%s): %s", c->c_name, strerror(errno));
+ break;
+ }
+ conrecycle(s);
+ return;
+ }
+ if (cp >= buf + sizeof(buf)) {
+ error("%s: greeting exceeds allowable length", c->c_name);
+ confree(s);
+ return;
+ }
+ if (*cp != '\n' && *cp != '\r') {
+ error("%s: bad greeting", c->c_name);
+ confree(s);
+ return;
+ }
+ *cp = '\0';
+ if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
+ fatal("ssh_packet_set_connection failed");
+ ssh_packet_set_timeout(c->c_ssh, timeout, 1);
+ ssh_set_app_data(c->c_ssh, c); /* back link */
+ c->c_ssh->compat = 0;
+ if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
+ &remote_major, &remote_minor, remote_version) == 3)
+ compat_banner(c->c_ssh, remote_version);
+ if (!ssh2_capable(remote_major, remote_minor)) {
+ debug("%s doesn't support ssh2", c->c_name);
+ confree(s);
+ return;
+ }
+ fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#',
+ c->c_name, ssh_port, chop(buf));
+ keygrab_ssh2(c);
+ confree(s);
+}
+
+static void
+conread(int s)
+{
+ con *c = &fdcon[s];
+ size_t n;
+
+ if (c->c_status == CS_CON) {
+ congreet(s);
+ return;
+ }
+ n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
+ if (n == 0) {
+ error("read (%s): %s", c->c_name, strerror(errno));
+ confree(s);
+ return;
+ }
+ c->c_off += n;
+
+ if (c->c_off == c->c_len)
+ switch (c->c_status) {
+ case CS_SIZE:
+ c->c_plen = htonl(c->c_plen);
+ c->c_len = c->c_plen + 8 - (c->c_plen & 7);
+ c->c_off = 0;
+ c->c_data = xmalloc(c->c_len);
+ c->c_status = CS_KEYS;
+ break;
+ default:
+ fatal("conread: invalid status %d", c->c_status);
+ break;
+ }
+
+ contouch(s);
+}
+
+static void
+conloop(void)
+{
+ struct timespec seltime, now;
+ con *c;
+ int i;
+
+ monotime_ts(&now);
+ c = TAILQ_FIRST(&tq);
+
+ if (c && timespeccmp(&c->c_ts, &now, >))
+ timespecsub(&c->c_ts, &now, &seltime);
+ else
+ timespecclear(&seltime);
+
+ while (ppoll(read_wait, maxfd, &seltime, NULL) == -1) {
+ if (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)
+ continue;
+ error("poll error");
+ }
+
+ for (i = 0; i < maxfd; i++) {
+ if (read_wait[i].revents & (POLLHUP|POLLERR|POLLNVAL))
+ confree(i);
+ else if (read_wait[i].revents & (POLLIN|POLLHUP))
+ conread(i);
+ }
+
+ c = TAILQ_FIRST(&tq);
+ while (c && timespeccmp(&c->c_ts, &now, <)) {
+ int s = c->c_fd;
+
+ c = TAILQ_NEXT(c, c_link);
+ conrecycle(s);
+ }
+}
+
+static void
+do_one_host(char *host)
+{
+ char *name = strnnsep(&host, " \t\n");
+ int j;
+
+ if (name == NULL)
+ return;
+ for (j = KT_MIN; j <= KT_MAX; j *= 2) {
+ if (get_keytypes & j) {
+ while (ncon >= MAXCON)
+ conloop();
+ conalloc(name, *host ? host : name, j);
+ }
+ }
+}
+
+static void
+do_host(char *host)
+{
+ char daddr[128];
+ struct xaddr addr, end_addr;
+ u_int masklen;
+
+ if (host == NULL)
+ return;
+ if (addr_pton_cidr(host, &addr, &masklen) != 0) {
+ /* Assume argument is a hostname */
+ do_one_host(host);
+ } else {
+ /* Argument is a CIDR range */
+ debug("CIDR range %s", host);
+ end_addr = addr;
+ if (addr_host_to_all1s(&end_addr, masklen) != 0)
+ goto badaddr;
+ /*
+ * Note: we deliberately include the all-zero/ones addresses.
+ */
+ for (;;) {
+ if (addr_ntop(&addr, daddr, sizeof(daddr)) != 0) {
+ badaddr:
+ error("Invalid address %s", host);
+ return;
+ }
+ debug("CIDR expand: address %s", daddr);
+ do_one_host(daddr);
+ if (addr_cmp(&addr, &end_addr) == 0)
+ break;
+ addr_increment(&addr);
+ };
+ }
+}
+
+void
+sshfatal(const char *file, const char *func, int line, int showfunc,
+ LogLevel level, const char *suffix, const char *fmt, ...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ sshlogv(file, func, line, showfunc, level, suffix, fmt, args);
+ va_end(args);
+ cleanup_exit(255);
+}
+
+static void
+usage(void)
+{
+ fprintf(stderr,
+ "usage: ssh-keyscan [-46cDHv] [-f file] [-O option] [-p port] [-T timeout]\n"
+ " [-t type] [host | addrlist namelist]\n");
+ exit(1);
+}
+
+int
+main(int argc, char **argv)
+{
+ int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
+ int opt, fopt_count = 0, j;
+ char *tname, *cp, *line = NULL;
+ size_t linesize = 0;
+ FILE *fp;
+
+ extern int optind;
+ extern char *optarg;
+
+ __progname = ssh_get_progname(argv[0]);
+ seed_rng();
+ TAILQ_INIT(&tq);
+
+ /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
+ sanitise_stdfd();
+
+ if (argc <= 1)
+ usage();
+
+ while ((opt = getopt(argc, argv, "cDHv46O:p:T:t:f:")) != -1) {
+ switch (opt) {
+ case 'H':
+ hash_hosts = 1;
+ break;
+ case 'c':
+ get_cert = 1;
+ break;
+ case 'D':
+ print_sshfp = 1;
+ break;
+ case 'p':
+ ssh_port = a2port(optarg);
+ if (ssh_port <= 0) {
+ fprintf(stderr, "Bad port '%s'\n", optarg);
+ exit(1);
+ }
+ break;
+ case 'T':
+ timeout = convtime(optarg);
+ if (timeout == -1 || timeout == 0) {
+ fprintf(stderr, "Bad timeout '%s'\n", optarg);
+ usage();
+ }
+ break;
+ case 'v':
+ if (!debug_flag) {
+ debug_flag = 1;
+ log_level = SYSLOG_LEVEL_DEBUG1;
+ }
+ else if (log_level < SYSLOG_LEVEL_DEBUG3)
+ log_level++;
+ else
+ fatal("Too high debugging level.");
+ break;
+ case 'f':
+ if (strcmp(optarg, "-") == 0)
+ optarg = NULL;
+ argv[fopt_count++] = optarg;
+ break;
+ case 'O':
+ /* Maybe other misc options in the future too */
+ if (strncmp(optarg, "hashalg=", 8) != 0)
+ fatal("Unsupported -O option");
+ if ((hashalg = ssh_digest_alg_by_name(
+ optarg + 8)) == -1)
+ fatal("Unsupported hash algorithm");
+ break;
+ case 't':
+ get_keytypes = 0;
+ tname = strtok(optarg, ",");
+ while (tname) {
+ int type = sshkey_type_from_name(tname);
+
+ switch (type) {
+ case KEY_DSA:
+ get_keytypes |= KT_DSA;
+ break;
+ case KEY_ECDSA:
+ get_keytypes |= KT_ECDSA;
+ break;
+ case KEY_RSA:
+ get_keytypes |= KT_RSA;
+ break;
+ case KEY_ED25519:
+ get_keytypes |= KT_ED25519;
+ break;
+ case KEY_XMSS:
+ get_keytypes |= KT_XMSS;
+ break;
+ case KEY_ED25519_SK:
+ get_keytypes |= KT_ED25519_SK;
+ break;
+ case KEY_ECDSA_SK:
+ get_keytypes |= KT_ECDSA_SK;
+ break;
+ case KEY_UNSPEC:
+ default:
+ fatal("Unknown key type \"%s\"", tname);
+ }
+ tname = strtok(NULL, ",");
+ }
+ break;
+ case '4':
+ IPv4or6 = AF_INET;
+ break;
+ case '6':
+ IPv4or6 = AF_INET6;
+ break;
+ default:
+ usage();
+ }
+ }
+ if (optind == argc && !fopt_count)
+ usage();
+
+ log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
+
+ maxfd = fdlim_get(1);
+ if (maxfd < 0)
+ fatal("%s: fdlim_get: bad value", __progname);
+ if (maxfd > MAXMAXFD)
+ maxfd = MAXMAXFD;
+ if (MAXCON <= 0)
+ fatal("%s: not enough file descriptors", __progname);
+ if (maxfd > fdlim_get(0))
+ fdlim_set(maxfd);
+ fdcon = xcalloc(maxfd, sizeof(con));
+ read_wait = xcalloc(maxfd, sizeof(struct pollfd));
+ for (j = 0; j < maxfd; j++)
+ read_wait[j].fd = -1;
+
+ for (j = 0; j < fopt_count; j++) {
+ if (argv[j] == NULL)
+ fp = stdin;
+ else if ((fp = fopen(argv[j], "r")) == NULL)
+ fatal("%s: %s: %s", __progname, argv[j], strerror(errno));
+
+ while (getline(&line, &linesize, fp) != -1) {
+ /* Chomp off trailing whitespace and comments */
+ if ((cp = strchr(line, '#')) == NULL)
+ cp = line + strlen(line) - 1;
+ while (cp >= line) {
+ if (*cp == ' ' || *cp == '\t' ||
+ *cp == '\n' || *cp == '#')
+ *cp-- = '\0';
+ else
+ break;
+ }
+
+ /* Skip empty lines */
+ if (*line == '\0')
+ continue;
+
+ do_host(line);
+ }
+
+ if (ferror(fp))
+ fatal("%s: %s: %s", __progname, argv[j], strerror(errno));
+
+ fclose(fp);
+ }
+ free(line);
+
+ while (optind < argc)
+ do_host(argv[optind++]);
+
+ while (ncon > 0)
+ conloop();
+
+ return found_one ? 0 : 1;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 21:42:06 +0000