version 1.119.2.1, 2002/06/26 15:30:39 |
version 1.119.2.2, 2002/10/11 14:51:53 |
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extern char *__progname; |
extern char *__progname; |
extern uid_t original_real_uid; |
extern uid_t original_real_uid; |
extern uid_t original_effective_uid; |
extern uid_t original_effective_uid; |
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extern pid_t proxy_command_pid; |
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static const char * |
static int show_other_keys(const char *, Key *); |
sockaddr_ntop(struct sockaddr *sa, socklen_t salen) |
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{ |
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static char addrbuf[NI_MAXHOST]; |
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if (getnameinfo(sa, salen, addrbuf, sizeof(addrbuf), NULL, 0, |
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NI_NUMERICHOST) != 0) |
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fatal("sockaddr_ntop: getnameinfo NI_NUMERICHOST failed"); |
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return addrbuf; |
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} |
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/* |
/* |
* Connect to the given ssh server using a proxy command. |
* Connect to the given ssh server using a proxy command. |
*/ |
*/ |
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/* Convert the port number into a string. */ |
/* Convert the port number into a string. */ |
snprintf(strport, sizeof strport, "%hu", port); |
snprintf(strport, sizeof strport, "%hu", port); |
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/* Build the final command string in the buffer by making the |
/* |
appropriate substitutions to the given proxy command. */ |
* Build the final command string in the buffer by making the |
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* appropriate substitutions to the given proxy command. |
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* |
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* Use "exec" to avoid "sh -c" processes on some platforms |
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* (e.g. Solaris) |
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*/ |
buffer_init(&command); |
buffer_init(&command); |
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buffer_append(&command, "exec ", 5); |
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for (cp = proxy_command; *cp; cp++) { |
for (cp = proxy_command; *cp; cp++) { |
if (cp[0] == '%' && cp[1] == '%') { |
if (cp[0] == '%' && cp[1] == '%') { |
buffer_append(&command, "%", 1); |
buffer_append(&command, "%", 1); |
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/* Parent. */ |
/* Parent. */ |
if (pid < 0) |
if (pid < 0) |
fatal("fork failed: %.100s", strerror(errno)); |
fatal("fork failed: %.100s", strerror(errno)); |
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else |
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proxy_command_pid = pid; /* save pid to clean up later */ |
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/* Close child side of the descriptors. */ |
/* Close child side of the descriptors. */ |
close(pin[0]); |
close(pin[0]); |
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int sock = -1, attempt; |
int sock = -1, attempt; |
char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
struct addrinfo hints, *ai, *aitop; |
struct addrinfo hints, *ai, *aitop; |
struct linger linger; |
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struct servent *sp; |
struct servent *sp; |
/* |
/* |
* Did we get only other errors than "Connection refused" (which |
* Did we get only other errors than "Connection refused" (which |
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} else { |
} else { |
if (errno == ECONNREFUSED) |
if (errno == ECONNREFUSED) |
full_failure = 0; |
full_failure = 0; |
log("ssh: connect to address %s port %s: %s", |
debug("connect to address %s port %s: %s", |
sockaddr_ntop(ai->ai_addr, ai->ai_addrlen), |
ntop, strport, strerror(errno)); |
strport, strerror(errno)); |
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/* |
/* |
* Close the failed socket; there appear to |
* Close the failed socket; there appear to |
* be some problems when reusing a socket for |
* be some problems when reusing a socket for |
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freeaddrinfo(aitop); |
freeaddrinfo(aitop); |
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/* Return failure if we didn't get a successful connection. */ |
/* Return failure if we didn't get a successful connection. */ |
if (attempt >= connection_attempts) |
if (attempt >= connection_attempts) { |
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log("ssh: connect to host %s port %s: %s", |
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host, strport, strerror(errno)); |
return full_failure ? ECONNABORTED : ECONNREFUSED; |
return full_failure ? ECONNABORTED : ECONNREFUSED; |
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} |
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debug("Connection established."); |
debug("Connection established."); |
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/* |
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* Set socket options. We would like the socket to disappear as soon |
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* as it has been closed for whatever reason. |
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*/ |
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/* setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); */ |
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linger.l_onoff = 1; |
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linger.l_linger = 5; |
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setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger)); |
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/* Set keepalives if requested. */ |
/* Set keepalives if requested. */ |
if (options.keepalives && |
if (options.keepalives && |
setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, |
setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, |
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(p[0] == '\0') || (p[0] == '\n') || |
(p[0] == '\0') || (p[0] == '\n') || |
strncasecmp(p, "no", 2) == 0) |
strncasecmp(p, "no", 2) == 0) |
ret = 0; |
ret = 0; |
if (strncasecmp(p, "yes", 3) == 0) |
if (p && strncasecmp(p, "yes", 3) == 0) |
ret = 1; |
ret = 1; |
if (p) |
if (p) |
xfree(p); |
xfree(p); |
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int local = 0, host_ip_differ = 0; |
int local = 0, host_ip_differ = 0; |
char ntop[NI_MAXHOST]; |
char ntop[NI_MAXHOST]; |
char msg[1024]; |
char msg[1024]; |
int len, host_line, ip_line; |
int len, host_line, ip_line, has_keys; |
const char *host_file = NULL, *ip_file = NULL; |
const char *host_file = NULL, *ip_file = NULL; |
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/* |
/* |
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"have requested strict checking.", type, host); |
"have requested strict checking.", type, host); |
goto fail; |
goto fail; |
} else if (options.strict_host_key_checking == 2) { |
} else if (options.strict_host_key_checking == 2) { |
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has_keys = show_other_keys(host, host_key); |
/* The default */ |
/* The default */ |
fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); |
fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); |
snprintf(msg, sizeof(msg), |
snprintf(msg, sizeof(msg), |
"The authenticity of host '%.200s (%s)' can't be " |
"The authenticity of host '%.200s (%s)' can't be " |
"established.\n" |
"established%s\n" |
"%s key fingerprint is %s.\n" |
"%s key fingerprint is %s.\n" |
"Are you sure you want to continue connecting " |
"Are you sure you want to continue connecting " |
"(yes/no)? ", host, ip, type, fp); |
"(yes/no)? ", |
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host, ip, |
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has_keys ? ",\nbut keys of different type are already " |
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"known for this host." : ".", |
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type, fp); |
xfree(fp); |
xfree(fp); |
if (!confirm(msg)) |
if (!confirm(msg)) |
goto fail; |
goto fail; |
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* accept the authentication. |
* accept the authentication. |
*/ |
*/ |
break; |
break; |
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case HOST_FOUND: |
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fatal("internal error"); |
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break; |
} |
} |
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if (options.check_host_ip && host_status != HOST_CHANGED && |
if (options.check_host_ip && host_status != HOST_CHANGED && |
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packet_put_string(padded, size); |
packet_put_string(padded, size); |
memset(padded, 0, size); |
memset(padded, 0, size); |
xfree(padded); |
xfree(padded); |
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} |
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static int |
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show_key_from_file(const char *file, const char *host, int keytype) |
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{ |
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Key *found; |
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char *fp; |
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int line, ret; |
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found = key_new(keytype); |
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if ((ret = lookup_key_in_hostfile_by_type(file, host, |
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keytype, found, &line))) { |
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fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX); |
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log("WARNING: %s key found for host %s\n" |
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"in %s:%d\n" |
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"%s key fingerprint %s.", |
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key_type(found), host, file, line, |
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key_type(found), fp); |
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xfree(fp); |
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} |
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key_free(found); |
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return (ret); |
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} |
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/* print all known host keys for a given host, but skip keys of given type */ |
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static int |
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show_other_keys(const char *host, Key *key) |
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{ |
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int type[] = { KEY_RSA1, KEY_RSA, KEY_DSA, -1}; |
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int i, found = 0; |
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for (i = 0; type[i] != -1; i++) { |
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if (type[i] == key->type) |
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continue; |
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if (type[i] != KEY_RSA1 && |
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show_key_from_file(options.user_hostfile2, host, type[i])) { |
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found = 1; |
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continue; |
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} |
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if (type[i] != KEY_RSA1 && |
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show_key_from_file(options.system_hostfile2, host, type[i])) { |
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found = 1; |
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continue; |
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} |
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if (show_key_from_file(options.user_hostfile, host, type[i])) { |
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found = 1; |
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continue; |
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} |
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if (show_key_from_file(options.system_hostfile, host, type[i])) { |
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found = 1; |
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continue; |
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} |
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debug2("no key of type %d for host %s", type[i], host); |
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} |
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return (found); |
} |
} |