int
mm_answer_gss_accept_ctx(int sock, struct sshbuf *m)
{
gss_buffer_desc in;
gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
OM_uint32 major, minor;
OM_uint32 flags = 0; /* GSI needs this */
size_t len;
u_char *p;
int r;
if ((r = sshbuf_get_string(m, &p, &len)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
in.value = p;
in.length = len;
major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
free(in.value);
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, major)) != 0 ||
(r = sshbuf_put_string(m, out.value, out.length)) != 0 ||
(r = sshbuf_put_u32(m, flags)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
gss_release_buffer(&minor, &out);
if (major == GSS_S_COMPLETE) {
monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
}
return 0;
}
static void
send_status(u_int32_t id, u_int32_t status)
{
struct sshbuf *msg;
int r;
debug3("request %u: sent status %u", id, status);
if (log_level > SYSLOG_LEVEL_VERBOSE ||
(status != SSH2_FX_OK && status != SSH2_FX_EOF))
logit("sent status %s", status_to_message(status));
if ((msg = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
if ((r = sshbuf_put_u8(msg, SSH2_FXP_STATUS)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = sshbuf_put_u32(msg, status)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
if (version >= 3) {
if ((r = sshbuf_put_cstring(msg,
status_to_message(status))) != 0 ||
(r = sshbuf_put_cstring(msg, "")) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
}
send_msg(msg);
sshbuf_free(msg);
}
int
kexgex_hash(
int hash_alg,
const char *client_version_string,
const char *server_version_string,
const u_char *ckexinit, size_t ckexinitlen,
const u_char *skexinit, size_t skexinitlen,
const u_char *serverhostkeyblob, size_t sbloblen,
int min, int wantbits, int max,
const BIGNUM *prime,
const BIGNUM *gen,
const BIGNUM *client_dh_pub,
const BIGNUM *server_dh_pub,
const BIGNUM *shared_secret,
u_char **hash, size_t *hashlen)
{
struct sshbuf *b;
static u_char digest[SSH_DIGEST_MAX_LENGTH];
int r;
if ((b = sshbuf_new()) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
(r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
(r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
(r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
(r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
(min != -1 && (r = sshbuf_put_u32(b, min)) != 0) ||
(r = sshbuf_put_u32(b, wantbits)) != 0 ||
(max != -1 && (r = sshbuf_put_u32(b, max)) != 0) ||
(r = sshbuf_put_bignum2(b, prime)) != 0 ||
(r = sshbuf_put_bignum2(b, gen)) != 0 ||
(r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 ||
(r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 ||
(r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
sshbuf_free(b);
return r;
}
#ifdef DEBUG_KEXDH
sshbuf_dump(b, stderr);
#endif
if (ssh_digest_buffer(hash_alg, b, digest, sizeof(digest)) != 0) {
sshbuf_free(b);
return SSH_ERR_LIBCRYPTO_ERROR;
}
sshbuf_free(b);
*hash = digest;
*hashlen = ssh_digest_bytes(hash_alg);
#ifdef DEBUG_KEXDH
dump_digest("hash", digest, *hashlen);
#endif
return 0;
}
/*
* Encodes terminal modes for the terminal referenced by fd
* or tiop in a portable manner, and appends the modes to a packet
* being constructed.
*/
void
ssh_tty_make_modes(struct ssh *ssh, int fd, struct termios *tiop)
{
struct termios tio;
struct sshbuf *buf;
int r, ibaud, obaud;
if ((buf = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
if (tiop == NULL) {
if (fd == -1) {
debug("%s: no fd or tio", __func__);
goto end;
}
if (tcgetattr(fd, &tio) == -1) {
logit("tcgetattr: %.100s", strerror(errno));
goto end;
}
} else
tio = *tiop;
/* Store input and output baud rates. */
obaud = speed_to_baud(cfgetospeed(&tio));
ibaud = speed_to_baud(cfgetispeed(&tio));
if ((r = sshbuf_put_u8(buf, TTY_OP_OSPEED)) != 0 ||
(r = sshbuf_put_u32(buf, obaud)) != 0 ||
(r = sshbuf_put_u8(buf, TTY_OP_ISPEED)) != 0 ||
(r = sshbuf_put_u32(buf, ibaud)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
/* Store values of mode flags. */
#define TTYCHAR(NAME, OP) \
if ((r = sshbuf_put_u8(buf, OP)) != 0 || \
(r = sshbuf_put_u32(buf, tio.c_cc[NAME])) != 0) \
fatal("%s: buffer error: %s", __func__, ssh_err(r)); \
#define SSH_TTYMODE_IUTF8 42 /* for SSH_BUG_UTF8TTYMODE */
#define TTYMODE(NAME, FIELD, OP) \
if (OP == SSH_TTYMODE_IUTF8 && (datafellows & SSH_BUG_UTF8TTYMODE)) { \
debug3("%s: SSH_BUG_UTF8TTYMODE", __func__); \
} else if ((r = sshbuf_put_u8(buf, OP)) != 0 || \
(r = sshbuf_put_u32(buf, ((tio.FIELD & NAME) != 0))) != 0) \
fatal("%s: buffer error: %s", __func__, ssh_err(r)); \
#include "ttymodes.h"
#undef TTYCHAR
#undef TTYMODE
end:
/* Mark end of mode data. */
if ((r = sshbuf_put_u8(buf, TTY_OP_END)) != 0 ||
(r = sshpkt_put_stringb(ssh, buf)) != 0)
fatal("%s: packet error: %s", __func__, ssh_err(r));
sshbuf_free(buf);
}
int
kex_ecdh_hash(
const EVP_MD *evp_md,
const EC_GROUP *ec_group,
const char *client_version_string,
const char *server_version_string,
const u_char *ckexinit, size_t ckexinitlen,
const u_char *skexinit, size_t skexinitlen,
const u_char *serverhostkeyblob, size_t sbloblen,
const EC_POINT *client_dh_pub,
const EC_POINT *server_dh_pub,
const BIGNUM *shared_secret,
u_char **hash, size_t *hashlen)
{
struct sshbuf *b;
EVP_MD_CTX md;
static u_char digest[EVP_MAX_MD_SIZE];
int r;
if ((b = sshbuf_new()) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
(r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
(r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
(r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
(r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
(r = sshbuf_put_ec(b, client_dh_pub, ec_group)) != 0 ||
(r = sshbuf_put_ec(b, server_dh_pub, ec_group)) != 0 ||
(r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
sshbuf_free(b);
return r;
}
#ifdef DEBUG_KEX
sshbuf_dump(b, stderr);
#endif
if (EVP_DigestInit(&md, evp_md) != 1 ||
EVP_DigestUpdate(&md, sshbuf_ptr(b), sshbuf_len(b)) != 1 ||
EVP_DigestFinal(&md, digest, NULL) != 1) {
sshbuf_free(b);
return SSH_ERR_LIBCRYPTO_ERROR;
}
sshbuf_free(b);
#ifdef DEBUG_KEX
dump_digest("hash", digest, EVP_MD_size(evp_md));
#endif
*hash = digest;
*hashlen = EVP_MD_size(evp_md);
return 0;
}
int
kex_ecdh_hash(
int hash_alg,
const EC_GROUP *ec_group,
const char *client_version_string,
const char *server_version_string,
const u_char *ckexinit, size_t ckexinitlen,
const u_char *skexinit, size_t skexinitlen,
const u_char *serverhostkeyblob, size_t sbloblen,
const EC_POINT *client_dh_pub,
const EC_POINT *server_dh_pub,
const BIGNUM *shared_secret,
u_char *hash, size_t *hashlen)
{
struct sshbuf *b;
int r;
if (*hashlen < ssh_digest_bytes(hash_alg))
return SSH_ERR_INVALID_ARGUMENT;
if ((b = sshbuf_new()) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
(r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
(r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
(r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
(r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
(r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
(r = sshbuf_put_ec(b, client_dh_pub, ec_group)) != 0 ||
(r = sshbuf_put_ec(b, server_dh_pub, ec_group)) != 0 ||
(r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
sshbuf_free(b);
return r;
}
#ifdef DEBUG_KEX
sshbuf_dump(b, stderr);
#endif
if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) {
sshbuf_free(b);
return SSH_ERR_LIBCRYPTO_ERROR;
}
sshbuf_free(b);
*hashlen = ssh_digest_bytes(hash_alg);
#ifdef DEBUG_KEX
dump_digest("hash", hash, *hashlen);
#endif
return 0;
}
int
mm_answer_rsa_keyallowed(int sock, struct sshbuf *m)
{
BIGNUM *client_n;
struct sshkey *key = NULL;
u_char *blob = NULL;
size_t blen = 0;
int r, allowed = 0;
debug3("%s entering", __func__);
auth_method = "rsa";
if (options.rsa_authentication && authctxt->valid) {
if ((client_n = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
if ((r = sshbuf_get_bignum2(m, client_n)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
BN_clear_free(client_n);
}
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, allowed)) != 0 ||
(r = sshbuf_put_u32(m, forced_command != NULL)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
/* clear temporarily storage (used by generate challenge) */
monitor_reset_key_state();
if (allowed && key != NULL) {
key->type = KEY_RSA; /* cheat for key_to_blob */
if ((r = sshkey_to_blob(key, &blob, &blen)) != 0)
fatal("%s: key_to_blob failed: %s",
__func__, ssh_err(r));
if ((r = sshbuf_put_string(m, blob, blen)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
/* Save temporarily for comparison in verify */
key_blob = blob;
key_bloblen = blen;
key_blobtype = MM_RSAUSERKEY;
}
if (key != NULL)
sshkey_free(key);
mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
return (0);
}
static void
build_cert(struct sshbuf *b, const struct sshkey *k, const char *type,
const struct sshkey *sign_key, const struct sshkey *ca_key,
const char *sig_alg)
{
struct sshbuf *ca_buf, *pk, *principals, *critopts, *exts;
u_char *sigblob;
size_t siglen;
ca_buf = sshbuf_new();
ASSERT_PTR_NE(ca_buf, NULL);
ASSERT_INT_EQ(sshkey_putb(ca_key, ca_buf), 0);
/*
* Get the public key serialisation by rendering the key and skipping
* the type string. This is a bit of a hack :/
*/
pk = sshbuf_new();
ASSERT_PTR_NE(pk, NULL);
ASSERT_INT_EQ(sshkey_putb_plain(k, pk), 0);
ASSERT_INT_EQ(sshbuf_skip_string(pk), 0);
principals = sshbuf_new();
ASSERT_PTR_NE(principals, NULL);
ASSERT_INT_EQ(sshbuf_put_cstring(principals, "gsamsa"), 0);
ASSERT_INT_EQ(sshbuf_put_cstring(principals, "gregor"), 0);
critopts = sshbuf_new();
ASSERT_PTR_NE(critopts, NULL);
put_opt(critopts, "force-command", "/usr/local/bin/nethack");
put_opt(critopts, "source-address", "192.168.0.0/24,127.0.0.1,::1");
exts = sshbuf_new();
ASSERT_PTR_NE(exts, NULL);
put_opt(critopts, "permit-X11-forwarding", NULL);
ASSERT_INT_EQ(sshbuf_put_cstring(b, type), 0);
ASSERT_INT_EQ(sshbuf_put_cstring(b, "noncenoncenonce!"), 0); /* nonce */
ASSERT_INT_EQ(sshbuf_putb(b, pk), 0); /* public key serialisation */
ASSERT_INT_EQ(sshbuf_put_u64(b, 1234), 0); /* serial */
ASSERT_INT_EQ(sshbuf_put_u32(b, SSH2_CERT_TYPE_USER), 0); /* type */
ASSERT_INT_EQ(sshbuf_put_cstring(b, "gregor"), 0); /* key ID */
ASSERT_INT_EQ(sshbuf_put_stringb(b, principals), 0); /* principals */
ASSERT_INT_EQ(sshbuf_put_u64(b, 0), 0); /* start */
ASSERT_INT_EQ(sshbuf_put_u64(b, 0xffffffffffffffffULL), 0); /* end */
ASSERT_INT_EQ(sshbuf_put_stringb(b, critopts), 0); /* options */
ASSERT_INT_EQ(sshbuf_put_stringb(b, exts), 0); /* extensions */
ASSERT_INT_EQ(sshbuf_put_string(b, NULL, 0), 0); /* reserved */
ASSERT_INT_EQ(sshbuf_put_stringb(b, ca_buf), 0); /* signature key */
ASSERT_INT_EQ(sshkey_sign(sign_key, &sigblob, &siglen,
sshbuf_ptr(b), sshbuf_len(b), sig_alg, 0), 0);
ASSERT_INT_EQ(sshbuf_put_string(b, sigblob, siglen), 0); /* signature */
free(sigblob);
sshbuf_free(ca_buf);
sshbuf_free(exts);
sshbuf_free(critopts);
sshbuf_free(principals);
sshbuf_free(pk);
}
int
mm_answer_gss_checkmic(int sock, struct sshbuf *m)
{
gss_buffer_desc gssbuf, mic;
OM_uint32 ret;
size_t len;
int r;
u_char *p;
if ((r = sshbuf_get_string(m, &p, &len)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
gssbuf.value = p;
gssbuf.length = len;
if ((r = sshbuf_get_string(m, &p, &len)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mic.value = p;
mic.length = len;
ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
free(gssbuf.value);
free(mic.value);
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, ret)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
if (!GSS_ERROR(ret))
monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
return 0;
}
int
mm_answer_bsdauthrespond(int sock, struct sshbuf *m)
{
char *response;
int r, authok;
if (authctxt->as == 0)
fatal("%s: no bsd auth session", __func__);
if ((r = sshbuf_get_cstring(m, &response, NULL)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
authok = options.challenge_response_authentication &&
auth_userresponse(authctxt->as, response, 0);
authctxt->as = NULL;
debug3("%s: <%s> = <%d>", __func__, response, authok);
free(response);
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, authok)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
debug3("%s: sending authenticated: %d", __func__, authok);
mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
if (compat20) {
auth_method = "keyboard-interactive";
auth_submethod = "bsdauth";
} else
auth_method = "bsdauth";
return (authok != 0);
}
int
mm_answer_sesskey(int sock, struct sshbuf *m)
{
BIGNUM *p;
int r, rsafail;
/* Turn off permissions */
monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
if ((p = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
if ((r = sshbuf_get_bignum2(m, p)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
rsafail = ssh1_session_key(p);
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, rsafail)) != 0 ||
(r = sshbuf_put_bignum2(m, p)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
BN_clear_free(p);
mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
/* Turn on permissions for sessid passing */
monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
return (0);
}
int
mm_answer_authpassword(int sock, struct sshbuf *m)
{
static int call_count;
char *passwd;
int r, authenticated;
size_t plen;
if ((r = sshbuf_get_cstring(m, &passwd, &plen)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
/* Only authenticate if the context is valid */
authenticated = options.password_authentication &&
auth_password(authctxt, passwd);
explicit_bzero(passwd, strlen(passwd));
free(passwd);
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, authenticated)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
debug3("%s: sending result %d", __func__, authenticated);
mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
call_count++;
if (plen == 0 && call_count == 1)
auth_method = "none";
else
auth_method = "password";
/* Causes monitor loop to terminate if authenticated */
return (authenticated);
}
static void
send_statvfs(u_int32_t id, struct statvfs *st)
{
struct sshbuf *msg;
u_int64_t flag;
int r;
flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
if ((msg = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = sshbuf_put_u64(msg, st->f_bsize)) != 0 ||
(r = sshbuf_put_u64(msg, st->f_frsize)) != 0 ||
(r = sshbuf_put_u64(msg, st->f_blocks)) != 0 ||
(r = sshbuf_put_u64(msg, st->f_bfree)) != 0 ||
(r = sshbuf_put_u64(msg, st->f_bavail)) != 0 ||
(r = sshbuf_put_u64(msg, st->f_files)) != 0 ||
(r = sshbuf_put_u64(msg, st->f_ffree)) != 0 ||
(r = sshbuf_put_u64(msg, st->f_favail)) != 0 ||
(r = sshbuf_put_u64(msg, FSID_TO_ULONG(st->f_fsid))) != 0 ||
(r = sshbuf_put_u64(msg, flag)) != 0 ||
(r = sshbuf_put_u64(msg, st->f_namemax)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
send_msg(msg);
sshbuf_free(msg);
}
/* put algorithm proposal into buffer */
int
kex_prop2buf(struct sshbuf *b, char *proposal[PROPOSAL_MAX])
{
u_int i;
int r;
sshbuf_reset(b);
/*
* add a dummy cookie, the cookie will be overwritten by
* kex_send_kexinit(), each time a kexinit is set
*/
for (i = 0; i < KEX_COOKIE_LEN; i++) {
if ((r = sshbuf_put_u8(b, 0)) != 0)
return r;
}
for (i = 0; i < PROPOSAL_MAX; i++) {
if ((r = sshbuf_put_cstring(b, proposal[i])) != 0)
return r;
}
if ((r = sshbuf_put_u8(b, 0)) != 0 || /* first_kex_packet_follows */
(r = sshbuf_put_u32(b, 0)) != 0) /* uint32 reserved */
return r;
return 0;
}
int
mm_answer_bsdauthquery(int sock, struct sshbuf *m)
{
char *name, *infotxt, **prompts;
u_int numprompts, *echo_on, success;
int r;
success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
&prompts, &echo_on) < 0 ? 0 : 1;
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, success)) != 0 ||
(success && (r = sshbuf_put_cstring(m, prompts[0])) != 0))
fatal("%s: buffer error: %s", __func__, ssh_err(r));
debug3("%s: sending challenge success: %u", __func__, success);
mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
if (success) {
free(name);
free(infotxt);
free(prompts);
free(echo_on);
}
return (0);
}
static void
process_init(void)
{
struct sshbuf *msg;
int r;
if ((r = sshbuf_get_u32(iqueue, &version)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
verbose("received client version %u", version);
if ((msg = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
if ((r = sshbuf_put_u8(msg, SSH2_FXP_VERSION)) != 0 ||
(r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0 ||
/* POSIX rename extension */
(r = sshbuf_put_cstring(msg, "*****@*****.**")) != 0 ||
(r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
/* statvfs extension */
(r = sshbuf_put_cstring(msg, "*****@*****.**")) != 0 ||
(r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
/* fstatvfs extension */
(r = sshbuf_put_cstring(msg, "*****@*****.**")) != 0 ||
(r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
/* hardlink extension */
(r = sshbuf_put_cstring(msg, "*****@*****.**")) != 0 ||
(r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
/* fsync extension */
(r = sshbuf_put_cstring(msg, "*****@*****.**")) != 0 ||
(r = sshbuf_put_cstring(msg, "1")) != 0) /* version */
fatal("%s: buffer error: %s", __func__, ssh_err(r));
send_msg(msg);
sshbuf_free(msg);
}
int
mm_answer_gss_setup_ctx(int sock, struct sshbuf *m)
{
gss_OID_desc goid;
OM_uint32 major;
size_t len;
u_char *p;
int r;
if ((r = sshbuf_get_string(m, &p, &len)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
goid.elements = p;
goid.length = len;
major = ssh_gssapi_server_ctx(&gsscontext, &goid);
free(goid.elements);
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, major)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
/* Now we have a context, enable the step */
monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
return (0);
}
static int
serialise_array(struct sshbuf *m, char **a, size_t n)
{
struct sshbuf *b;
size_t i;
int r;
if (n > INT_MAX)
return SSH_ERR_INTERNAL_ERROR;
if ((b = sshbuf_new()) == NULL) {
return SSH_ERR_ALLOC_FAIL;
}
for (i = 0; i < n; i++) {
if ((r = sshbuf_put_cstring(b, a[i])) != 0) {
sshbuf_free(b);
return r;
}
}
if ((r = sshbuf_put_u32(m, n)) != 0 ||
(r = sshbuf_put_stringb(m, b)) != 0) {
sshbuf_free(b);
return r;
}
/* success */
return 0;
}
void
buffer_put_int(Buffer *buffer, u_int value)
{
int ret;
if ((ret = sshbuf_put_u32(buffer, value)) != 0)
fatal("%s: %s", __func__, ssh_err(ret));
}
int
sshkey_xmss_serialize_pk_info(const struct sshkey *k, struct sshbuf *b,
enum sshkey_serialize_rep opts)
{
struct ssh_xmss_state *state = k->xmss_state;
u_char have_info = 1;
u_int32_t idx;
int r;
if (state == NULL)
return SSH_ERR_INVALID_ARGUMENT;
if (opts != SSHKEY_SERIALIZE_INFO)
return 0;
idx = k->xmss_sk ? PEEK_U32(k->xmss_sk) : state->idx;
if ((r = sshbuf_put_u8(b, have_info)) != 0 ||
(r = sshbuf_put_u32(b, idx)) != 0 ||
(r = sshbuf_put_u32(b, state->maxidx)) != 0)
return r;
return 0;
}
static void
build_cert(struct sshbuf *b, const struct sshkey *k, const char *type,
const struct sshkey *sign_key, const struct sshkey *ca_key)
{
struct sshbuf *ca_buf, *pk, *principals, *critopts, *exts;
u_char *sigblob;
size_t siglen;
ca_buf = sshbuf_new();
ASSERT_INT_EQ(sshkey_to_blob_buf(ca_key, ca_buf), 0);
/*
* Get the public key serialisation by rendering the key and skipping
* the type string. This is a bit of a hack :/
*/
pk = sshbuf_new();
ASSERT_INT_EQ(sshkey_plain_to_blob_buf(k, pk), 0);
ASSERT_INT_EQ(sshbuf_skip_string(pk), 0);
principals = sshbuf_new();
ASSERT_INT_EQ(sshbuf_put_cstring(principals, "gsamsa"), 0);
ASSERT_INT_EQ(sshbuf_put_cstring(principals, "gregor"), 0);
critopts = sshbuf_new();
/* XXX fill this in */
exts = sshbuf_new();
/* XXX fill this in */
ASSERT_INT_EQ(sshbuf_put_cstring(b, type), 0);
ASSERT_INT_EQ(sshbuf_put_cstring(b, "noncenoncenonce!"), 0); /* nonce */
ASSERT_INT_EQ(sshbuf_putb(b, pk), 0); /* public key serialisation */
ASSERT_INT_EQ(sshbuf_put_u64(b, 1234), 0); /* serial */
ASSERT_INT_EQ(sshbuf_put_u32(b, SSH2_CERT_TYPE_USER), 0); /* type */
ASSERT_INT_EQ(sshbuf_put_cstring(b, "gregor"), 0); /* key ID */
ASSERT_INT_EQ(sshbuf_put_stringb(b, principals), 0); /* principals */
ASSERT_INT_EQ(sshbuf_put_u64(b, 0), 0); /* start */
ASSERT_INT_EQ(sshbuf_put_u64(b, 0xffffffffffffffffULL), 0); /* end */
ASSERT_INT_EQ(sshbuf_put_stringb(b, critopts), 0); /* options */
ASSERT_INT_EQ(sshbuf_put_stringb(b, exts), 0); /* extensions */
ASSERT_INT_EQ(sshbuf_put_string(b, NULL, 0), 0); /* reserved */
ASSERT_INT_EQ(sshbuf_put_stringb(b, ca_buf), 0); /* signature key */
ASSERT_INT_EQ(sshkey_sign(sign_key, &sigblob, &siglen,
sshbuf_ptr(b), sshbuf_len(b), 0), 0);
ASSERT_INT_EQ(sshbuf_put_string(b, sigblob, siglen), 0); /* signature */
free(sigblob);
sshbuf_free(ca_buf);
sshbuf_free(exts);
sshbuf_free(critopts);
sshbuf_free(principals);
sshbuf_free(pk);
}
/* Encode attributes to buffer */
int
encode_attrib(struct sshbuf *b, const Attrib *a)
{
int r;
if ((r = sshbuf_put_u32(b, a->flags)) != 0)
return r;
if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
if ((r = sshbuf_put_u64(b, a->size)) != 0)
return r;
}
if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
if ((r = sshbuf_put_u32(b, a->uid)) != 0 ||
(r = sshbuf_put_u32(b, a->gid)) != 0)
return r;
}
if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
if ((r = sshbuf_put_u32(b, a->perm)) != 0)
return r;
}
if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
if ((r = sshbuf_put_u32(b, a->atime)) != 0 ||
(r = sshbuf_put_u32(b, a->mtime)) != 0)
return r;
}
return 0;
}
/* ask agent to sign data, returns err.h code on error, 0 on success */
int
ssh_agent_sign(int sock, struct sshkey *key,
u_char **sigp, size_t *lenp,
const u_char *data, size_t datalen, u_int compat)
{
struct sshbuf *msg;
u_char *blob = NULL, type;
size_t blen = 0, len = 0;
u_int flags = 0;
int r = SSH_ERR_INTERNAL_ERROR;
if (sigp != NULL)
*sigp = NULL;
if (lenp != NULL)
*lenp = 0;
if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE)
return SSH_ERR_INVALID_ARGUMENT;
if (compat & SSH_BUG_SIGBLOB)
flags |= SSH_AGENT_OLD_SIGNATURE;
if ((msg = sshbuf_new()) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((r = sshkey_to_blob(key, &blob, &blen)) != 0)
goto out;
if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 ||
(r = sshbuf_put_string(msg, blob, blen)) != 0 ||
(r = sshbuf_put_string(msg, data, datalen)) != 0 ||
(r = sshbuf_put_u32(msg, flags)) != 0)
goto out;
if ((r = ssh_request_reply(sock, msg, msg) != 0))
goto out;
if ((r = sshbuf_get_u8(msg, &type)) != 0)
goto out;
if (agent_failed(type)) {
r = SSH_ERR_AGENT_FAILURE;
goto out;
} else if (type != SSH2_AGENT_SIGN_RESPONSE) {
r = SSH_ERR_INVALID_FORMAT;
goto out;
}
if ((r = sshbuf_get_string(msg, sigp, &len)) != 0)
goto out;
*lenp = len;
r = 0;
out:
if (blob != NULL) {
explicit_bzero(blob, blen);
free(blob);
}
sshbuf_free(msg);
return r;
}
static void
send_names(u_int32_t id, int count, const Stat *stats)
{
struct sshbuf *msg;
int i, r;
if ((msg = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
if ((r = sshbuf_put_u8(msg, SSH2_FXP_NAME)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = sshbuf_put_u32(msg, count)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
debug("request %u: sent names count %d", id, count);
for (i = 0; i < count; i++) {
if ((r = sshbuf_put_cstring(msg, stats[i].name)) != 0 ||
(r = sshbuf_put_cstring(msg, stats[i].long_name)) != 0 ||
(r = encode_attrib(msg, &stats[i].attrib)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
}
send_msg(msg);
sshbuf_free(msg);
}
int
ssh_decrypt_challenge(int sock, struct sshkey* key, BIGNUM *challenge,
u_char session_id[16], u_char response[16])
{
struct sshbuf *msg;
int r;
u_char type;
if (key->type != KEY_RSA1)
return SSH_ERR_INVALID_ARGUMENT;
if ((msg = sshbuf_new()) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((r = sshbuf_put_u8(msg, SSH_AGENTC_RSA_CHALLENGE)) != 0 ||
(r = sshbuf_put_u32(msg, BN_num_bits(key->rsa->n))) != 0 ||
(r = sshbuf_put_bignum1(msg, key->rsa->e)) != 0 ||
(r = sshbuf_put_bignum1(msg, key->rsa->n)) != 0 ||
(r = sshbuf_put_bignum1(msg, challenge)) != 0 ||
(r = sshbuf_put(msg, session_id, 16)) != 0 ||
(r = sshbuf_put_u32(msg, 1)) != 0) /* Response type for proto 1.1 */
goto out;
if ((r = ssh_request_reply(sock, msg, msg)) != 0)
goto out;
if ((r = sshbuf_get_u8(msg, &type)) != 0)
goto out;
if (agent_failed(type)) {
r = SSH_ERR_AGENT_FAILURE;
goto out;
} else if (type != SSH_AGENT_RSA_RESPONSE) {
r = SSH_ERR_INVALID_FORMAT;
goto out;
}
if ((r = sshbuf_get(msg, response, 16)) != 0)
goto out;
r = 0;
out:
sshbuf_free(msg);
return r;
}
static void
send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen)
{
struct sshbuf *msg;
int r;
if ((msg = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
if ((r = sshbuf_put_u8(msg, type)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = sshbuf_put_string(msg, data, dlen)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
send_msg(msg);
sshbuf_free(msg);
}
static void
send_attrib(u_int32_t id, const Attrib *a)
{
struct sshbuf *msg;
int r;
debug("request %u: sent attrib have 0x%x", id, a->flags);
if ((msg = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
if ((r = sshbuf_put_u8(msg, SSH2_FXP_ATTRS)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = encode_attrib(msg, a)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
send_msg(msg);
sshbuf_free(msg);
}
int
mm_answer_rsa_response(int sock, struct sshbuf *m)
{
struct sshkey *key = NULL;
u_char *blob, *response;
size_t blen, len;
int r, success;
debug3("%s entering", __func__);
if (!authctxt->valid)
fatal("%s: authctxt not valid", __func__);
if (ssh1_challenge == NULL)
fatal("%s: no ssh1_challenge", __func__);
if ((r = sshbuf_get_string(m, &blob, &blen)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
if (!monitor_allowed_key(blob, blen))
fatal("%s: bad key, not previously allowed", __func__);
if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
fatal("%s: key type mismatch: %d", __func__, key_blobtype);
if ((r = sshkey_from_blob(blob, blen, &key)) != 0)
fatal("%s: received bad key: %s", __func__, ssh_err(r));
if ((r = sshbuf_get_string(m, &response, &len)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
if (len != 16)
fatal("%s: received bad response to challenge", __func__);
success = auth_rsa_verify_response(key, ssh1_challenge, response);
free(blob);
sshkey_free(key);
free(response);
auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
/* reset state */
BN_clear_free(ssh1_challenge);
ssh1_challenge = NULL;
monitor_reset_key_state();
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, success)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
return (success);
}
static int
ssh_encode_identity_rsa1(struct sshbuf *b, RSA *key, const char *comment)
{
int r;
/* To keep within the protocol: p < q for ssh. in SSL p > q */
if ((r = sshbuf_put_u32(b, BN_num_bits(key->n))) != 0 ||
(r = sshbuf_put_bignum1(b, key->n)) != 0 ||
(r = sshbuf_put_bignum1(b, key->e)) != 0 ||
(r = sshbuf_put_bignum1(b, key->d)) != 0 ||
(r = sshbuf_put_bignum1(b, key->iqmp)) != 0 ||
(r = sshbuf_put_bignum1(b, key->q)) != 0 ||
(r = sshbuf_put_bignum1(b, key->p)) != 0 ||
(r = sshbuf_put_cstring(b, comment)) != 0)
return r;
return 0;
}
/*
* Removes an identity from the authentication server.
* This call is intended only for use by ssh-add(1) and like applications.
*/
int
ssh_remove_identity(int sock, struct sshkey *key)
{
struct sshbuf *msg;
int r;
u_char type, *blob = NULL;
size_t blen;
if ((msg = sshbuf_new()) == NULL)
return SSH_ERR_ALLOC_FAIL;
#ifdef WITH_SSH1
if (key->type == KEY_RSA1) {
if ((r = sshbuf_put_u8(msg,
SSH_AGENTC_REMOVE_RSA_IDENTITY)) != 0 ||
(r = sshbuf_put_u32(msg, BN_num_bits(key->rsa->n))) != 0 ||
(r = sshbuf_put_bignum1(msg, key->rsa->e)) != 0 ||
(r = sshbuf_put_bignum1(msg, key->rsa->n)) != 0)
goto out;
} else
#endif
if (key->type != KEY_UNSPEC) {
if ((r = sshkey_to_blob(key, &blob, &blen)) != 0)
goto out;
if ((r = sshbuf_put_u8(msg,
SSH2_AGENTC_REMOVE_IDENTITY)) != 0 ||
(r = sshbuf_put_string(msg, blob, blen)) != 0)
goto out;
} else {
r = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
if ((r = ssh_request_reply(sock, msg, msg)) != 0)
goto out;
if ((r = sshbuf_get_u8(msg, &type)) != 0)
goto out;
r = decode_reply(type);
out:
if (blob != NULL) {
explicit_bzero(blob, blen);
free(blob);
}
sshbuf_free(msg);
return r;
}