version 1.19.2.4, 2001/05/07 21:09:25 |
version 1.19.2.5, 2001/09/27 00:15:41 |
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#include "xmalloc.h" |
#include "xmalloc.h" |
#include "log.h" |
#include "log.h" |
#include "servconf.h" |
#include "servconf.h" |
|
#include "uidswap.h" |
#include "auth.h" |
#include "auth.h" |
|
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#ifdef AFS |
#ifdef AFS |
|
|
#endif |
#endif |
|
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#ifdef KRB4 |
#ifdef KRB4 |
char *ticket = NULL; |
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|
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extern ServerOptions options; |
extern ServerOptions options; |
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|
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static int |
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krb4_init(void *context) |
|
{ |
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static int cleanup_registered = 0; |
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Authctxt *authctxt = (Authctxt *)context; |
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const char *tkt_root = TKT_ROOT; |
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struct stat st; |
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int fd; |
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|
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if (!authctxt->krb4_ticket_file) { |
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/* Set unique ticket string manually since we're still root. */ |
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authctxt->krb4_ticket_file = xmalloc(MAXPATHLEN); |
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#ifdef AFS |
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if (lstat("/ticket", &st) != -1) |
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tkt_root = "/ticket/"; |
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#endif /* AFS */ |
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snprintf(authctxt->krb4_ticket_file, MAXPATHLEN, "%s%u_%d", |
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tkt_root, authctxt->pw->pw_uid, getpid()); |
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krb_set_tkt_string(authctxt->krb4_ticket_file); |
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} |
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/* Register ticket cleanup in case of fatal error. */ |
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if (!cleanup_registered) { |
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fatal_add_cleanup(krb4_cleanup_proc, authctxt); |
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cleanup_registered = 1; |
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} |
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/* Try to create our ticket file. */ |
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if ((fd = mkstemp(authctxt->krb4_ticket_file)) != -1) { |
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close(fd); |
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return (1); |
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} |
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/* Ticket file exists - make sure user owns it (just passed ticket). */ |
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if (lstat(authctxt->krb4_ticket_file, &st) != -1) { |
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if (st.st_mode == (S_IFREG | S_IRUSR | S_IWUSR) && |
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st.st_uid == authctxt->pw->pw_uid) |
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return (1); |
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} |
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/* Failure - cancel cleanup function, leaving ticket for inspection. */ |
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log("WARNING: bad ticket file %s", authctxt->krb4_ticket_file); |
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|
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fatal_remove_cleanup(krb4_cleanup_proc, authctxt); |
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cleanup_registered = 0; |
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|
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xfree(authctxt->krb4_ticket_file); |
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authctxt->krb4_ticket_file = NULL; |
|
|
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return (0); |
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} |
|
|
/* |
/* |
* try krb4 authentication, |
* try krb4 authentication, |
* return 1 on success, 0 on failure, -1 if krb4 is not available |
* return 1 on success, 0 on failure, -1 if krb4 is not available |
*/ |
*/ |
|
|
int |
int |
auth_krb4_password(struct passwd * pw, const char *password) |
auth_krb4_password(Authctxt *authctxt, const char *password) |
{ |
{ |
AUTH_DAT adata; |
AUTH_DAT adata; |
KTEXT_ST tkt; |
KTEXT_ST tkt; |
struct hostent *hp; |
struct hostent *hp; |
u_long faddr; |
struct passwd *pw; |
char localhost[MAXHOSTNAMELEN]; |
char localhost[MAXHOSTNAMELEN], phost[INST_SZ], realm[REALM_SZ]; |
char phost[INST_SZ]; |
u_int32_t faddr; |
char realm[REALM_SZ]; |
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int r; |
int r; |
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|
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if ((pw = authctxt->pw) == NULL) |
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return (0); |
|
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/* |
/* |
* Try Kerberos password authentication only for non-root |
* Try Kerberos password authentication only for non-root |
* users and only if Kerberos is installed. |
* users and only if Kerberos is installed. |
*/ |
*/ |
if (pw->pw_uid != 0 && krb_get_lrealm(realm, 1) == KSUCCESS) { |
if (pw->pw_uid != 0 && krb_get_lrealm(realm, 1) == KSUCCESS) { |
|
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/* Set up our ticket file. */ |
/* Set up our ticket file. */ |
if (!krb4_init(pw->pw_uid)) { |
if (!krb4_init(authctxt)) { |
log("Couldn't initialize Kerberos ticket file for %s!", |
log("Couldn't initialize Kerberos ticket file for %s!", |
pw->pw_name); |
pw->pw_name); |
goto kerberos_auth_failure; |
goto failure; |
} |
} |
/* Try to get TGT using our password. */ |
/* Try to get TGT using our password. */ |
r = krb_get_pw_in_tkt((char *) pw->pw_name, "", |
r = krb_get_pw_in_tkt((char *) pw->pw_name, "", realm, |
realm, "krbtgt", realm, |
"krbtgt", realm, DEFAULT_TKT_LIFE, (char *)password); |
DEFAULT_TKT_LIFE, (char *) password); |
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if (r != INTK_OK) { |
if (r != INTK_OK) { |
packet_send_debug("Kerberos V4 password " |
debug("Kerberos v4 password authentication for %s " |
"authentication for %s failed: %s", |
"failed: %s", pw->pw_name, krb_err_txt[r]); |
pw->pw_name, krb_err_txt[r]); |
goto failure; |
goto kerberos_auth_failure; |
|
} |
} |
/* Successful authentication. */ |
/* Successful authentication. */ |
chown(tkt_string(), pw->pw_uid, pw->pw_gid); |
chown(tkt_string(), pw->pw_uid, pw->pw_gid); |
|
|
/* |
/* |
* Now that we have a TGT, try to get a local |
* Now that we have a TGT, try to get a local |
* "rcmd" ticket to ensure that we are not talking |
* "rcmd" ticket to ensure that we are not talking |
* to a bogus Kerberos server. |
* to a bogus Kerberos server. |
*/ |
*/ |
(void) gethostname(localhost, sizeof(localhost)); |
gethostname(localhost, sizeof(localhost)); |
(void) strlcpy(phost, (char *) krb_get_phost(localhost), |
strlcpy(phost, (char *)krb_get_phost(localhost), |
INST_SZ); |
sizeof(phost)); |
r = krb_mk_req(&tkt, KRB4_SERVICE_NAME, phost, realm, 33); |
r = krb_mk_req(&tkt, KRB4_SERVICE_NAME, phost, realm, 33); |
|
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if (r == KSUCCESS) { |
if (r == KSUCCESS) { |
if (!(hp = gethostbyname(localhost))) { |
if ((hp = gethostbyname(localhost)) == NULL) { |
log("Couldn't get local host address!"); |
log("Couldn't get local host address!"); |
goto kerberos_auth_failure; |
goto failure; |
} |
} |
memmove((void *) &faddr, (void *) hp->h_addr, |
memmove((void *)&faddr, (void *)hp->h_addr, |
sizeof(faddr)); |
sizeof(faddr)); |
|
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/* Verify our "rcmd" ticket. */ |
/* Verify our "rcmd" ticket. */ |
r = krb_rd_req(&tkt, KRB4_SERVICE_NAME, phost, |
r = krb_rd_req(&tkt, KRB4_SERVICE_NAME, phost, |
faddr, &adata, ""); |
faddr, &adata, ""); |
|
|
* Probably didn't have a srvtab on |
* Probably didn't have a srvtab on |
* localhost. Disallow login. |
* localhost. Disallow login. |
*/ |
*/ |
log("Kerberos V4 TGT for %s unverifiable, " |
log("Kerberos v4 TGT for %s unverifiable, " |
"no srvtab installed? krb_rd_req: %s", |
"no srvtab installed? krb_rd_req: %s", |
pw->pw_name, krb_err_txt[r]); |
pw->pw_name, krb_err_txt[r]); |
goto kerberos_auth_failure; |
goto failure; |
} else if (r != KSUCCESS) { |
} else if (r != KSUCCESS) { |
log("Kerberos V4 %s ticket unverifiable: %s", |
log("Kerberos v4 %s ticket unverifiable: %s", |
KRB4_SERVICE_NAME, krb_err_txt[r]); |
KRB4_SERVICE_NAME, krb_err_txt[r]); |
goto kerberos_auth_failure; |
goto failure; |
} |
} |
} else if (r == KDC_PR_UNKNOWN) { |
} else if (r == KDC_PR_UNKNOWN) { |
/* |
/* |
* Disallow login if no rcmd service exists, and |
* Disallow login if no rcmd service exists, and |
* log the error. |
* log the error. |
*/ |
*/ |
log("Kerberos V4 TGT for %s unverifiable: %s; %s.%s " |
log("Kerberos v4 TGT for %s unverifiable: %s; %s.%s " |
"not registered, or srvtab is wrong?", pw->pw_name, |
"not registered, or srvtab is wrong?", pw->pw_name, |
krb_err_txt[r], KRB4_SERVICE_NAME, phost); |
krb_err_txt[r], KRB4_SERVICE_NAME, phost); |
goto kerberos_auth_failure; |
goto failure; |
} else { |
} else { |
/* |
/* |
* TGT is bad, forget it. Possibly spoofed! |
* TGT is bad, forget it. Possibly spoofed! |
*/ |
*/ |
packet_send_debug("WARNING: Kerberos V4 TGT " |
debug("WARNING: Kerberos v4 TGT possibly spoofed " |
"possibly spoofed for %s: %s", |
"for %s: %s", pw->pw_name, krb_err_txt[r]); |
pw->pw_name, krb_err_txt[r]); |
goto failure; |
goto kerberos_auth_failure; |
|
} |
} |
|
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/* Authentication succeeded. */ |
/* Authentication succeeded. */ |
return 1; |
return (1); |
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} else |
kerberos_auth_failure: |
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krb4_cleanup_proc(NULL); |
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|
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if (!options.kerberos_or_local_passwd) |
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return 0; |
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} else { |
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/* Logging in as root or no local Kerberos realm. */ |
/* Logging in as root or no local Kerberos realm. */ |
packet_send_debug("Unable to authenticate to Kerberos."); |
debug("Unable to authenticate to Kerberos."); |
} |
|
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failure: |
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krb4_cleanup_proc(authctxt); |
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|
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if (!options.kerberos_or_local_passwd) |
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return (0); |
|
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/* Fall back to ordinary passwd authentication. */ |
/* Fall back to ordinary passwd authentication. */ |
return -1; |
return (-1); |
} |
} |
|
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void |
void |
krb4_cleanup_proc(void *ignore) |
krb4_cleanup_proc(void *context) |
{ |
{ |
|
Authctxt *authctxt = (Authctxt *)context; |
debug("krb4_cleanup_proc called"); |
debug("krb4_cleanup_proc called"); |
if (ticket) { |
if (authctxt->krb4_ticket_file) { |
(void) dest_tkt(); |
(void) dest_tkt(); |
xfree(ticket); |
xfree(authctxt->krb4_ticket_file); |
ticket = NULL; |
authctxt->krb4_ticket_file = NULL; |
} |
} |
} |
} |
|
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int |
int |
krb4_init(uid_t uid) |
auth_krb4(Authctxt *authctxt, KTEXT auth, char **client) |
{ |
{ |
static int cleanup_registered = 0; |
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const char *tkt_root = TKT_ROOT; |
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struct stat st; |
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int fd; |
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|
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if (!ticket) { |
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/* Set unique ticket string manually since we're still root. */ |
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ticket = xmalloc(MAXPATHLEN); |
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#ifdef AFS |
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if (lstat("/ticket", &st) != -1) |
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tkt_root = "/ticket/"; |
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#endif /* AFS */ |
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snprintf(ticket, MAXPATHLEN, "%s%u_%d", tkt_root, uid, getpid()); |
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(void) krb_set_tkt_string(ticket); |
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} |
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/* Register ticket cleanup in case of fatal error. */ |
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if (!cleanup_registered) { |
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fatal_add_cleanup(krb4_cleanup_proc, NULL); |
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cleanup_registered = 1; |
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} |
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/* Try to create our ticket file. */ |
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if ((fd = mkstemp(ticket)) != -1) { |
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close(fd); |
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return 1; |
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} |
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/* Ticket file exists - make sure user owns it (just passed ticket). */ |
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if (lstat(ticket, &st) != -1) { |
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if (st.st_mode == (S_IFREG | S_IRUSR | S_IWUSR) && |
|
st.st_uid == uid) |
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return 1; |
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} |
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/* Failure - cancel cleanup function, leaving bad ticket for inspection. */ |
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log("WARNING: bad ticket file %s", ticket); |
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fatal_remove_cleanup(krb4_cleanup_proc, NULL); |
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cleanup_registered = 0; |
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xfree(ticket); |
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ticket = NULL; |
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|
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return 0; |
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} |
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|
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int |
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auth_krb4(const char *server_user, KTEXT auth, char **client) |
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{ |
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AUTH_DAT adat = {0}; |
AUTH_DAT adat = {0}; |
KTEXT_ST reply; |
KTEXT_ST reply; |
|
Key_schedule schedule; |
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struct sockaddr_in local, foreign; |
char instance[INST_SZ]; |
char instance[INST_SZ]; |
int r, s; |
|
socklen_t slen; |
socklen_t slen; |
u_int cksum; |
u_int cksum; |
Key_schedule schedule; |
int r, s; |
struct sockaddr_in local, foreign; |
|
|
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s = packet_get_connection_in(); |
s = packet_get_connection_in(); |
|
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slen = sizeof(local); |
slen = sizeof(local); |
memset(&local, 0, sizeof(local)); |
memset(&local, 0, sizeof(local)); |
if (getsockname(s, (struct sockaddr *) & local, &slen) < 0) |
if (getsockname(s, (struct sockaddr *) & local, &slen) < 0) |
|
|
} |
} |
instance[0] = '*'; |
instance[0] = '*'; |
instance[1] = 0; |
instance[1] = 0; |
|
|
/* Get the encrypted request, challenge, and session key. */ |
/* Get the encrypted request, challenge, and session key. */ |
if ((r = krb_rd_req(auth, KRB4_SERVICE_NAME, instance, 0, &adat, ""))) { |
if ((r = krb_rd_req(auth, KRB4_SERVICE_NAME, instance, |
packet_send_debug("Kerberos V4 krb_rd_req: %.100s", krb_err_txt[r]); |
0, &adat, ""))) { |
return 0; |
debug("Kerberos v4 krb_rd_req: %.100s", krb_err_txt[r]); |
|
return (0); |
} |
} |
des_key_sched((des_cblock *) adat.session, schedule); |
des_key_sched((des_cblock *) adat.session, schedule); |
|
|
*client = xmalloc(MAX_K_NAME_SZ); |
*client = xmalloc(MAX_K_NAME_SZ); |
(void) snprintf(*client, MAX_K_NAME_SZ, "%s%s%s@%s", adat.pname, |
(void) snprintf(*client, MAX_K_NAME_SZ, "%s%s%s@%s", adat.pname, |
*adat.pinst ? "." : "", adat.pinst, adat.prealm); |
*adat.pinst ? "." : "", adat.pinst, adat.prealm); |
|
|
/* Check ~/.klogin authorization now. */ |
/* Check ~/.klogin authorization now. */ |
if (kuserok(&adat, (char *) server_user) != KSUCCESS) { |
if (kuserok(&adat, authctxt->user) != KSUCCESS) { |
packet_send_debug("Kerberos V4 .klogin authorization failed!"); |
log("Kerberos v4 .klogin authorization failed for %s to " |
log("Kerberos V4 .klogin authorization failed for %s to account %s", |
"account %s", *client, authctxt->user); |
*client, server_user); |
|
xfree(*client); |
xfree(*client); |
return 0; |
return (0); |
} |
} |
/* Increment the checksum, and return it encrypted with the |
/* Increment the checksum, and return it encrypted with the |
session key. */ |
session key. */ |
cksum = adat.checksum + 1; |
cksum = adat.checksum + 1; |
cksum = htonl(cksum); |
cksum = htonl(cksum); |
|
|
/* If we can't successfully encrypt the checksum, we send back an |
/* If we can't successfully encrypt the checksum, we send back an |
empty message, admitting our failure. */ |
empty message, admitting our failure. */ |
if ((r = krb_mk_priv((u_char *) & cksum, reply.dat, sizeof(cksum) + 1, |
if ((r = krb_mk_priv((u_char *) & cksum, reply.dat, sizeof(cksum) + 1, |
schedule, &adat.session, &local, &foreign)) < 0) { |
schedule, &adat.session, &local, &foreign)) < 0) { |
packet_send_debug("Kerberos V4 mk_priv: (%d) %s", r, krb_err_txt[r]); |
debug("Kerberos v4 mk_priv: (%d) %s", r, krb_err_txt[r]); |
reply.dat[0] = 0; |
reply.dat[0] = 0; |
reply.length = 0; |
reply.length = 0; |
} else |
} else |
reply.length = r; |
reply.length = r; |
|
|
/* Clear session key. */ |
/* Clear session key. */ |
memset(&adat.session, 0, sizeof(&adat.session)); |
memset(&adat.session, 0, sizeof(&adat.session)); |
|
|
packet_start(SSH_SMSG_AUTH_KERBEROS_RESPONSE); |
packet_start(SSH_SMSG_AUTH_KERBEROS_RESPONSE); |
packet_put_string((char *) reply.dat, reply.length); |
packet_put_string((char *) reply.dat, reply.length); |
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
return 1; |
return (1); |
} |
} |
#endif /* KRB4 */ |
#endif /* KRB4 */ |
|
|
#ifdef AFS |
#ifdef AFS |
int |
int |
auth_kerberos_tgt(struct passwd *pw, const char *string) |
auth_krb4_tgt(Authctxt *authctxt, const char *string) |
{ |
{ |
CREDENTIALS creds; |
CREDENTIALS creds; |
|
struct passwd *pw; |
if (pw == NULL) |
|
goto auth_kerberos_tgt_failure; |
if ((pw = authctxt->pw) == NULL) |
|
goto failure; |
|
|
|
temporarily_use_uid(pw); |
|
|
if (!radix_to_creds(string, &creds)) { |
if (!radix_to_creds(string, &creds)) { |
log("Protocol error decoding Kerberos V4 tgt"); |
log("Protocol error decoding Kerberos v4 TGT"); |
packet_send_debug("Protocol error decoding Kerberos V4 tgt"); |
goto failure; |
goto auth_kerberos_tgt_failure; |
|
} |
} |
if (strncmp(creds.service, "", 1) == 0) /* backward compatibility */ |
if (strncmp(creds.service, "", 1) == 0) /* backward compatibility */ |
strlcpy(creds.service, "krbtgt", sizeof creds.service); |
strlcpy(creds.service, "krbtgt", sizeof creds.service); |
|
|
if (strcmp(creds.service, "krbtgt")) { |
if (strcmp(creds.service, "krbtgt")) { |
log("Kerberos V4 tgt (%s%s%s@%s) rejected for %s", creds.pname, |
log("Kerberos v4 TGT (%s%s%s@%s) rejected for %s", |
creds.pinst[0] ? "." : "", creds.pinst, creds.realm, |
|
pw->pw_name); |
|
packet_send_debug("Kerberos V4 tgt (%s%s%s@%s) rejected for %s", |
|
creds.pname, creds.pinst[0] ? "." : "", creds.pinst, |
creds.pname, creds.pinst[0] ? "." : "", creds.pinst, |
creds.realm, pw->pw_name); |
creds.realm, pw->pw_name); |
goto auth_kerberos_tgt_failure; |
goto failure; |
} |
} |
if (!krb4_init(pw->pw_uid)) |
if (!krb4_init(authctxt)) |
goto auth_kerberos_tgt_failure; |
goto failure; |
|
|
if (in_tkt(creds.pname, creds.pinst) != KSUCCESS) |
if (in_tkt(creds.pname, creds.pinst) != KSUCCESS) |
goto auth_kerberos_tgt_failure; |
goto failure; |
|
|
if (save_credentials(creds.service, creds.instance, creds.realm, |
if (save_credentials(creds.service, creds.instance, creds.realm, |
creds.session, creds.lifetime, creds.kvno, |
creds.session, creds.lifetime, creds.kvno, &creds.ticket_st, |
&creds.ticket_st, creds.issue_date) != KSUCCESS) { |
creds.issue_date) != KSUCCESS) { |
packet_send_debug("Kerberos V4 tgt refused: couldn't save credentials"); |
debug("Kerberos v4 TGT refused: couldn't save credentials"); |
goto auth_kerberos_tgt_failure; |
goto failure; |
} |
} |
/* Successful authentication, passed all checks. */ |
/* Successful authentication, passed all checks. */ |
chown(tkt_string(), pw->pw_uid, pw->pw_gid); |
chown(tkt_string(), pw->pw_uid, pw->pw_gid); |
|
|
packet_send_debug("Kerberos V4 tgt accepted (%s.%s@%s, %s%s%s@%s)", |
debug("Kerberos v4 TGT accepted (%s%s%s@%s)", |
creds.service, creds.instance, creds.realm, creds.pname, |
creds.pname, creds.pinst[0] ? "." : "", creds.pinst, creds.realm); |
creds.pinst[0] ? "." : "", creds.pinst, creds.realm); |
|
memset(&creds, 0, sizeof(creds)); |
memset(&creds, 0, sizeof(creds)); |
packet_start(SSH_SMSG_SUCCESS); |
|
packet_send(); |
restore_uid(); |
packet_write_wait(); |
|
return 1; |
return (1); |
|
|
auth_kerberos_tgt_failure: |
failure: |
krb4_cleanup_proc(NULL); |
krb4_cleanup_proc(authctxt); |
memset(&creds, 0, sizeof(creds)); |
memset(&creds, 0, sizeof(creds)); |
packet_start(SSH_SMSG_FAILURE); |
restore_uid(); |
packet_send(); |
|
packet_write_wait(); |
return (0); |
return 0; |
|
} |
} |
|
|
int |
int |
auth_afs_token(struct passwd *pw, const char *token_string) |
auth_afs_token(Authctxt *authctxt, const char *token_string) |
{ |
{ |
CREDENTIALS creds; |
CREDENTIALS creds; |
|
struct passwd *pw; |
uid_t uid; |
uid_t uid; |
|
|
if (pw == NULL) { |
if ((pw = authctxt->pw) == NULL) |
/* XXX fake protocol error */ |
return (0); |
packet_send_debug("Protocol error decoding AFS token"); |
|
packet_start(SSH_SMSG_FAILURE); |
|
packet_send(); |
|
packet_write_wait(); |
|
return 0; |
|
} |
|
if (!radix_to_creds(token_string, &creds)) { |
if (!radix_to_creds(token_string, &creds)) { |
log("Protocol error decoding AFS token"); |
log("Protocol error decoding AFS token"); |
packet_send_debug("Protocol error decoding AFS token"); |
return (0); |
packet_start(SSH_SMSG_FAILURE); |
|
packet_send(); |
|
packet_write_wait(); |
|
return 0; |
|
} |
} |
if (strncmp(creds.service, "", 1) == 0) /* backward compatibility */ |
if (strncmp(creds.service, "", 1) == 0) /* backward compatibility */ |
strlcpy(creds.service, "afs", sizeof creds.service); |
strlcpy(creds.service, "afs", sizeof creds.service); |
|
|
if (strncmp(creds.pname, "AFS ID ", 7) == 0) |
if (strncmp(creds.pname, "AFS ID ", 7) == 0) |
uid = atoi(creds.pname + 7); |
uid = atoi(creds.pname + 7); |
else |
else |
uid = pw->pw_uid; |
uid = pw->pw_uid; |
|
|
if (kafs_settoken(creds.realm, uid, &creds)) { |
if (kafs_settoken(creds.realm, uid, &creds)) { |
log("AFS token (%s@%s) rejected for %s", creds.pname, creds.realm, |
log("AFS token (%s@%s) rejected for %s", |
pw->pw_name); |
creds.pname, creds.realm, pw->pw_name); |
packet_send_debug("AFS token (%s@%s) rejected for %s", creds.pname, |
|
creds.realm, pw->pw_name); |
|
memset(&creds, 0, sizeof(creds)); |
memset(&creds, 0, sizeof(creds)); |
packet_start(SSH_SMSG_FAILURE); |
return (0); |
packet_send(); |
|
packet_write_wait(); |
|
return 0; |
|
} |
} |
packet_send_debug("AFS token accepted (%s@%s, %s@%s)", creds.service, |
debug("AFS token accepted (%s@%s)", creds.pname, creds.realm); |
creds.realm, creds.pname, creds.realm); |
|
memset(&creds, 0, sizeof(creds)); |
memset(&creds, 0, sizeof(creds)); |
packet_start(SSH_SMSG_SUCCESS); |
|
packet_send(); |
return (1); |
packet_write_wait(); |
|
return 1; |
|
} |
} |
#endif /* AFS */ |
#endif /* AFS */ |