Excerpts from the release notes: * ssh-agent(1): PKCS#11 modules must now be specified by their full paths. Previously dlopen(3) could search for them in system library directories. * ssh(1): allow forwarding Unix Domain sockets via ssh -W. * ssh(1): add support for configuration tags to ssh(1). This adds a ssh_config(5) "Tag" directive and corresponding "Match tag" predicate that may be used to select blocks of configuration similar to the pf.conf(5) keywords of the same name. * ssh(1): add a "match localnetwork" predicate. This allows matching on the addresses of available network interfaces and may be used to vary the effective client configuration based on network location. * ssh-agent(1): improve isolation between loaded PKCS#11 modules by running separate ssh-pkcs11-helpers for each loaded provider. * ssh-agent(1), ssh(1): improve defences against invalid PKCS#11 modules being loaded by checking that the requested module contains the required symbol before loading it. * ssh(1): don't incorrectly disable hostname canonicalization when CanonicalizeHostname=yes and ProxyJump was expicitly set to "none". bz3567 Full release notes at https://www.openssh.com/txt/release-9.4 Relnotes: Yes Sponsored by: The FreeBSD Foundation
891 lines
20 KiB
C
891 lines
20 KiB
C
/* $OpenBSD: ssh-keyscan.c,v 1.153 2023/06/21 05:06:04 djm Exp $ */
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/*
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* Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
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*
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* Modification and redistribution in source and binary forms is
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* permitted provided that due credit is given to the author and the
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* OpenBSD project by leaving this copyright notice intact.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include "openbsd-compat/sys-queue.h"
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#include <sys/resource.h>
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#ifdef WITH_OPENSSL
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#include <openssl/bn.h>
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#endif
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#include <limits.h>
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#include <netdb.h>
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#include <errno.h>
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#ifdef HAVE_POLL_H
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#include <poll.h>
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#endif
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <string.h>
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#include <unistd.h>
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#include "xmalloc.h"
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#include "ssh.h"
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#include "sshbuf.h"
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#include "sshkey.h"
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#include "cipher.h"
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#include "digest.h"
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#include "kex.h"
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#include "compat.h"
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#include "myproposal.h"
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#include "packet.h"
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#include "dispatch.h"
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#include "log.h"
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#include "atomicio.h"
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#include "misc.h"
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#include "hostfile.h"
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#include "ssherr.h"
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#include "ssh_api.h"
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#include "dns.h"
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#include "addr.h"
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/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
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Default value is AF_UNSPEC means both IPv4 and IPv6. */
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int IPv4or6 = AF_UNSPEC;
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int ssh_port = SSH_DEFAULT_PORT;
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#define KT_DSA (1)
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#define KT_RSA (1<<1)
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#define KT_ECDSA (1<<2)
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#define KT_ED25519 (1<<3)
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#define KT_XMSS (1<<4)
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#define KT_ECDSA_SK (1<<5)
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#define KT_ED25519_SK (1<<6)
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#define KT_MIN KT_DSA
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#define KT_MAX KT_ED25519_SK
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int get_cert = 0;
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int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK;
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int hash_hosts = 0; /* Hash hostname on output */
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int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */
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int found_one = 0; /* Successfully found a key */
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int hashalg = -1; /* Hash for SSHFP records or -1 for all */
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#define MAXMAXFD 256
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/* The number of seconds after which to give up on a TCP connection */
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int timeout = 5;
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int maxfd;
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#define MAXCON (maxfd - 10)
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extern char *__progname;
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struct pollfd *read_wait;
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int ncon;
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/*
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* Keep a connection structure for each file descriptor. The state
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* associated with file descriptor n is held in fdcon[n].
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*/
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typedef struct Connection {
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u_char c_status; /* State of connection on this file desc. */
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#define CS_UNUSED 0 /* File descriptor unused */
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#define CS_CON 1 /* Waiting to connect/read greeting */
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#define CS_SIZE 2 /* Waiting to read initial packet size */
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#define CS_KEYS 3 /* Waiting to read public key packet */
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int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
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int c_plen; /* Packet length field for ssh packet */
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int c_len; /* Total bytes which must be read. */
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int c_off; /* Length of data read so far. */
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int c_keytype; /* Only one of KT_* */
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sig_atomic_t c_done; /* SSH2 done */
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char *c_namebase; /* Address to free for c_name and c_namelist */
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char *c_name; /* Hostname of connection for errors */
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char *c_namelist; /* Pointer to other possible addresses */
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char *c_output_name; /* Hostname of connection for output */
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char *c_data; /* Data read from this fd */
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struct ssh *c_ssh; /* SSH-connection */
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struct timespec c_ts; /* Time at which connection gets aborted */
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TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
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} con;
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TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
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con *fdcon;
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static void keyprint(con *c, struct sshkey *key);
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static int
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fdlim_get(int hard)
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{
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#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
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struct rlimit rlfd;
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rlim_t lim;
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if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
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return -1;
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lim = hard ? rlfd.rlim_max : rlfd.rlim_cur;
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if (lim <= 0)
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return -1;
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if (lim == RLIM_INFINITY)
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lim = SSH_SYSFDMAX;
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if (lim >= INT_MAX)
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lim = INT_MAX;
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return lim;
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#else
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return (SSH_SYSFDMAX <= 0) ? -1 :
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((SSH_SYSFDMAX >= INT_MAX) ? INT_MAX : SSH_SYSFDMAX);
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#endif
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}
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static int
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fdlim_set(int lim)
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{
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#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
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struct rlimit rlfd;
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#endif
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if (lim <= 0)
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return (-1);
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#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
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if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1)
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return (-1);
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rlfd.rlim_cur = lim;
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if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1)
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return (-1);
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#elif defined (HAVE_SETDTABLESIZE)
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setdtablesize(lim);
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#endif
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return (0);
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}
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/*
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* This is an strsep function that returns a null field for adjacent
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* separators. This is the same as the 4.4BSD strsep, but different from the
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* one in the GNU libc.
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*/
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static char *
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xstrsep(char **str, const char *delim)
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{
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char *s, *e;
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if (!**str)
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return (NULL);
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s = *str;
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e = s + strcspn(s, delim);
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if (*e != '\0')
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*e++ = '\0';
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*str = e;
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return (s);
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}
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/*
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* Get the next non-null token (like GNU strsep). Strsep() will return a
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* null token for two adjacent separators, so we may have to loop.
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*/
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static char *
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strnnsep(char **stringp, char *delim)
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{
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char *tok;
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do {
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tok = xstrsep(stringp, delim);
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} while (tok && *tok == '\0');
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return (tok);
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}
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static int
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key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
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{
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con *c;
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if ((c = ssh_get_app_data(ssh)) != NULL)
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keyprint(c, hostkey);
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/* always abort key exchange */
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return -1;
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}
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static int
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ssh2_capable(int remote_major, int remote_minor)
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{
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switch (remote_major) {
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case 1:
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if (remote_minor == 99)
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return 1;
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break;
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case 2:
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return 1;
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default:
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break;
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}
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return 0;
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}
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static void
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keygrab_ssh2(con *c)
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{
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char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
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int r;
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switch (c->c_keytype) {
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case KT_DSA:
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myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
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"ssh-dss-cert-v01@openssh.com" : "ssh-dss";
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break;
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case KT_RSA:
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myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
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"rsa-sha2-512-cert-v01@openssh.com,"
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"rsa-sha2-256-cert-v01@openssh.com,"
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"ssh-rsa-cert-v01@openssh.com" :
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"rsa-sha2-512,"
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"rsa-sha2-256,"
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"ssh-rsa";
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break;
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case KT_ED25519:
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myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
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"ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
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break;
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case KT_XMSS:
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myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
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"ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com";
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break;
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case KT_ECDSA:
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myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
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"ecdsa-sha2-nistp256-cert-v01@openssh.com,"
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"ecdsa-sha2-nistp384-cert-v01@openssh.com,"
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"ecdsa-sha2-nistp521-cert-v01@openssh.com" :
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"ecdsa-sha2-nistp256,"
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"ecdsa-sha2-nistp384,"
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"ecdsa-sha2-nistp521";
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break;
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case KT_ECDSA_SK:
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myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
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"sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" :
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"sk-ecdsa-sha2-nistp256@openssh.com";
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break;
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case KT_ED25519_SK:
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myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
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"sk-ssh-ed25519-cert-v01@openssh.com" :
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"sk-ssh-ed25519@openssh.com";
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break;
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default:
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fatal("unknown key type %d", c->c_keytype);
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break;
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}
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if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
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free(c->c_ssh);
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fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
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exit(1);
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}
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#ifdef WITH_OPENSSL
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c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
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c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
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c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
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c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
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c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
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c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
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c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
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# ifdef OPENSSL_HAS_ECC
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c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
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# endif
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#endif
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c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
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c->c_ssh->kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_client;
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ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
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/*
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* do the key-exchange until an error occurs or until
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* the key_print_wrapper() callback sets c_done.
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*/
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ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
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}
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static void
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keyprint_one(const char *host, struct sshkey *key)
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{
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char *hostport = NULL, *hashed = NULL;
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const char *known_host;
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int r = 0;
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found_one = 1;
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if (print_sshfp) {
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export_dns_rr(host, key, stdout, 0, hashalg);
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return;
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}
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hostport = put_host_port(host, ssh_port);
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lowercase(hostport);
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if (hash_hosts && (hashed = host_hash(hostport, NULL, 0)) == NULL)
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fatal("host_hash failed");
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known_host = hash_hosts ? hashed : hostport;
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if (!get_cert)
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r = fprintf(stdout, "%s ", known_host);
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if (r >= 0 && sshkey_write(key, stdout) == 0)
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(void)fputs("\n", stdout);
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free(hashed);
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free(hostport);
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}
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static void
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keyprint(con *c, struct sshkey *key)
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{
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char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
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char *host, *ohosts;
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if (key == NULL)
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return;
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if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
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keyprint_one(hosts, key);
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return;
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}
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ohosts = hosts = xstrdup(hosts);
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while ((host = strsep(&hosts, ",")) != NULL)
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keyprint_one(host, key);
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free(ohosts);
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}
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static int
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tcpconnect(char *host)
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{
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struct addrinfo hints, *ai, *aitop;
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char strport[NI_MAXSERV];
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int gaierr, s = -1;
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snprintf(strport, sizeof strport, "%d", ssh_port);
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = IPv4or6;
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hints.ai_socktype = SOCK_STREAM;
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if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
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error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
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return -1;
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}
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for (ai = aitop; ai; ai = ai->ai_next) {
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s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
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if (s == -1) {
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error("socket: %s", strerror(errno));
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continue;
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}
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if (set_nonblock(s) == -1)
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fatal_f("set_nonblock(%d)", s);
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if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 &&
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errno != EINPROGRESS)
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error("connect (`%s'): %s", host, strerror(errno));
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else
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break;
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close(s);
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s = -1;
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}
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freeaddrinfo(aitop);
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return s;
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}
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static int
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conalloc(const char *iname, const char *oname, int keytype)
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{
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char *namebase, *name, *namelist;
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int s;
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namebase = namelist = xstrdup(iname);
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do {
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name = xstrsep(&namelist, ",");
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if (!name) {
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free(namebase);
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return (-1);
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}
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} while ((s = tcpconnect(name)) < 0);
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if (s >= maxfd)
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fatal("conalloc: fdno %d too high", s);
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if (fdcon[s].c_status)
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fatal("conalloc: attempt to reuse fdno %d", s);
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debug3_f("oname %s kt %d", oname, keytype);
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fdcon[s].c_fd = s;
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fdcon[s].c_status = CS_CON;
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fdcon[s].c_namebase = namebase;
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fdcon[s].c_name = name;
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fdcon[s].c_namelist = namelist;
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fdcon[s].c_output_name = xstrdup(oname);
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fdcon[s].c_data = (char *) &fdcon[s].c_plen;
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fdcon[s].c_len = 4;
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fdcon[s].c_off = 0;
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fdcon[s].c_keytype = keytype;
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monotime_ts(&fdcon[s].c_ts);
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fdcon[s].c_ts.tv_sec += timeout;
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TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
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read_wait[s].fd = s;
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read_wait[s].events = POLLIN;
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ncon++;
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return (s);
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}
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static void
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confree(int s)
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{
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if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
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fatal("confree: attempt to free bad fdno %d", s);
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free(fdcon[s].c_namebase);
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free(fdcon[s].c_output_name);
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if (fdcon[s].c_status == CS_KEYS)
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free(fdcon[s].c_data);
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fdcon[s].c_status = CS_UNUSED;
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fdcon[s].c_keytype = 0;
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if (fdcon[s].c_ssh) {
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ssh_packet_close(fdcon[s].c_ssh);
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free(fdcon[s].c_ssh);
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fdcon[s].c_ssh = NULL;
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} else
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close(s);
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TAILQ_REMOVE(&tq, &fdcon[s], c_link);
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read_wait[s].fd = -1;
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read_wait[s].events = 0;
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ncon--;
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}
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static void
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contouch(int s)
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{
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TAILQ_REMOVE(&tq, &fdcon[s], c_link);
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monotime_ts(&fdcon[s].c_ts);
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fdcon[s].c_ts.tv_sec += timeout;
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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;
|
|
}
|