/*
- * $Id: uams_gss.c,v 1.9 2009-10-15 14:54:43 franklahm Exp $
- *
* Copyright (c) 1990,1993 Regents of The University of Michigan.
* Copyright (c) 1999 Adrian Sun (asun@u.washington.edu)
* Copyright (c) 2003 The Reed Institute
#include "config.h"
#endif /* HAVE_CONFIG_H */
-#include <stdio.h>
#include <stdlib.h>
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif /* HAVE_UNISTD_H */
-
-/* STDC check */
-#if STDC_HEADERS
#include <string.h>
-#else /* STDC_HEADERS */
-#ifndef HAVE_STRCHR
-#define strchr index
-#define strrchr index
-#endif /* HAVE_STRCHR */
-char *strchr (), *strrchr ();
-#ifndef HAVE_MEMCPY
-#define memcpy(d,s,n) bcopy ((s), (d), (n))
-#define memmove(d,s,n) bcopy ((s), (d), (n))
-#endif /* ! HAVE_MEMCPY */
-#endif /* STDC_HEADERS */
-
-#include <errno.h>
+#include <arpa/inet.h>
+
#include <atalk/logger.h>
#include <atalk/afp.h>
#include <atalk/uam.h>
#include <atalk/util.h>
+#include <atalk/compat.h>
/* Kerberos includes */
-
-#if HAVE_GSSAPI_H
-#include <gssapi.h>
-#endif
-
-#if HAVE_GSSAPI_GSSAPI_H
+#ifdef HAVE_GSSAPI_GSSAPI_H
#include <gssapi/gssapi.h>
-#endif
-
-#if HAVE_GSSAPI_GSSAPI_GENERIC_H
-#include <gssapi/gssapi_generic.h>
-#endif
-
-#if HAVE_GSSAPI_GSSAPI_KRB5_H
-#include <gssapi/gssapi_krb5.h>
-#endif
-
-#if HAVE_COM_ERR_H
-#include <com_err.h>
-#endif
-
-/* We work around something I don't entirely understand... */
-/* BF: This is a Heimdal/MIT compatibility fix */
-#ifndef HAVE_GSS_C_NT_HOSTBASED_SERVICE
-#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
-#endif
-
-#ifdef MIN
-#undef MIN
-#endif
-
-#define MIN(a, b) ((a > b) ? b : a)
+#else
+#include <gssapi.h>
+#endif // HAVE_GSSAPI_GSSAPI_H
static void log_status( char *s, OM_uint32 major_status,
OM_uint32 minor_status )
static void log_ctx_flags( OM_uint32 flags )
{
-#ifdef DEBUG1
+#ifdef DEBUG
if (flags & GSS_C_DELEG_FLAG)
LOG(log_debug, logtype_uams, "uams_gss.c :context flag: GSS_C_DELEG_FLAG" );
if (flags & GSS_C_MUTUAL_FLAG)
#endif
}
-static void log_principal(gss_name_t server_name)
-{
-#ifdef DEBUG1
- OM_uint32 major_status = 0, minor_status = 0;
- gss_buffer_desc exported_name;
-
- /* Only for debugging purposes, check the gssapi internal representation */
- major_status = gss_export_name(&minor_status, server_name, &exported_name);
- LOG(log_debug, logtype_uams, "log_principal: exported server name is %s", (char*) exported_name.value);
- gss_release_buffer( &minor_status, &exported_name );
-#endif
-}
-
-/* get the principal from afpd and import it into server_name */
-static int get_afpd_principal(void *obj, gss_name_t *server_name)
-{
- OM_uint32 major_status = 0, minor_status = 0;
- char *realm, *fqdn, *service, *principal, *p;
- size_t realmlen=0, fqdnlen=0, servicelen=0;
- size_t principal_length;
- gss_buffer_desc s_princ_buffer;
-
- /* get all the required information from afpd */
- if (uam_afpserver_option(obj, UAM_OPTION_KRB5REALM, (void*) &realm, &realmlen) < 0)
- return 1;
- LOG(log_debug, logtype_uams, "get_afpd_principal: REALM: %s", realm);
-
- if (uam_afpserver_option(obj, UAM_OPTION_FQDN, (void*) &fqdn, &fqdnlen) < 0)
- return 1;
- LOG(log_debug, logtype_uams, "get_afpd_principal: fqdn: %s", fqdn);
-
- if (uam_afpserver_option(obj, UAM_OPTION_KRB5SERVICE, (void *)&service, &servicelen) < 0)
- return 1;
- LOG(log_debug, logtype_uams, "get_afpd_principal: service: %s", service);
-
- /* we need all the info, log error and return if one's missing */
- if (!service || !servicelen || !fqdn || !fqdnlen || !realm || !realmlen) {
- LOG(log_error, logtype_uams,
- "get_afpd_principal: could not retrieve required information from afpd.");
- return 1;
- }
-
- /* allocate memory to hold the temporary principal string */
- principal_length = servicelen + 1 + fqdnlen + 1 + realmlen + 1;
- if ( NULL == (principal = (char*) malloc( principal_length)) ) {
- LOG(log_error, logtype_uams,
- "get_afpd_principal: out of memory allocating %u bytes",
- principal_length);
- return 1;
- }
-
- /*
- * Build the principal string.
- * Format: 'service/fqdn@realm'
- */
- strlcpy( principal, service, principal_length);
- strlcat( principal, "/", principal_length);
-
- /*
- * The fqdn we get from afpd may contain a port.
- * We need to strip the port from fqdn for principal.
- */
- p = strchr(fqdn, ':');
- if (p)
- *p = '\0';
- strlcat( principal, fqdn, principal_length);
- if (p)
- *p = ':';
- strlcat( principal, "@", principal_length);
- strlcat( principal, realm, principal_length);
-
- /*
- * Import our principal into the gssapi internal representation
- * stored in server_name.
- */
- s_princ_buffer.value = principal;
- s_princ_buffer.length = strlen( principal ) + 1;
-
- LOG(log_debug, logtype_uams, "get_afpd_principal: importing principal `%s'", principal);
- major_status = gss_import_name( &minor_status,
- &s_princ_buffer,
- GSS_C_NO_OID,
- server_name );
-
- /*
- * Get rid of malloc'ed memmory.
- * Don't release the s_princ_buffer, we free principal instead.
- */
- free(principal);
-
- if (major_status != GSS_S_COMPLETE) {
- /* Importing our service principal failed, bail out. */
- log_status( "import_principal", major_status, minor_status );
- return 1;
- }
- return 0;
-}
-
/* get the username */
static int get_client_username(char *username, int ulen, gss_name_t *client_name)
sesskey_buff.value = sinfo->sessionkey;
sesskey_buff.length = sinfo->sessionkey_len;
- /* gss_wrap the session key with the default machanism.
+ /* gss_wrap the session key with the default mechanism.
Require both confidentiality and integrity services */
gss_wrap (&status, context, 1, GSS_C_QOP_DEFAULT, &sesskey_buff, NULL, &wrap_buff);
}
/*-------------*/
-static int acquire_credentials (gss_name_t *server_name, gss_cred_id_t *server_creds)
-{
- OM_uint32 major_status = 0, minor_status = 0;
- char *envp;
-
- if (envp = getenv("KRB5_KTNAME"))
- LOG(log_debug, logtype_uams,
- "acquire credentials: acquiring credentials (uid = %d, keytab = %s)",
- (int)geteuid(), envp);
- else
- LOG(log_debug, logtype_uams,
- "acquire credentials: acquiring credentials (uid = %d) - $KRB5_KTNAME not found in env",
- (int)geteuid());
-
- /*
- * Acquire credentials usable for accepting context negotiations.
- * Credentials are for server_name, have an indefinite lifetime,
- * have no specific mechanisms, are to be used for accepting context
- * negotiations and are to be placed in server_creds.
- * We don't care about the mechanisms or about the time for which they are valid.
- */
- major_status = gss_acquire_cred( &minor_status, *server_name,
- GSS_C_INDEFINITE, GSS_C_NO_OID_SET, GSS_C_ACCEPT,
- server_creds, NULL, NULL );
-
- if (major_status != GSS_S_COMPLETE) {
- log_status( "acquire_cred", major_status, minor_status );
- return 1;
- }
-
- return 0;
-}
-
-/*-------------*/
-static int accept_sec_context (gss_ctx_id_t *context, gss_cred_id_t server_creds,
+static int accept_sec_context (gss_ctx_id_t *context,
gss_buffer_desc *ticket_buffer, gss_name_t *client_name,
gss_buffer_desc *authenticator_buff)
{
ticket_buffer->length);
/*
- * Try to accept the secondary context using the tocken in ticket_buffer.
- * We don't care about the mechanisms used, nor for the time.
+ * Try to accept the secondary context using the token in ticket_buffer.
+ * We don't care about the principals or mechanisms used, nor for the time.
* We don't act as a proxy either.
*/
major_status = gss_accept_sec_context( &minor_status, context,
- server_creds, ticket_buffer, GSS_C_NO_CHANNEL_BINDINGS,
+ GSS_C_NO_CREDENTIAL, ticket_buffer, GSS_C_NO_CHANNEL_BINDINGS,
client_name, NULL, authenticator_buff,
&ret_flags, NULL, NULL );
struct session_info *sinfo )
{
OM_uint32 status = 0;
- gss_name_t server_name, client_name;
- gss_cred_id_t server_creds;
+ gss_name_t client_name;
gss_ctx_id_t context_handle = GSS_C_NO_CONTEXT;
gss_buffer_desc ticket_buffer, authenticator_buff;
int ret = 0;
- /* import our principal name from afpd */
- if (get_afpd_principal(obj, &server_name) != 0) {
- return 1;
- }
- log_principal(server_name);
-
- /* Now we have to acquire our credentials */
- if ((ret = acquire_credentials (&server_name, &server_creds)))
- goto cleanup_vars;
-
/*
* Try to accept the secondary context, using the ticket/token the
* client sent us. Ticket is stored at current ibuf position.
ticket_buffer.length = ticket_len;
ticket_buffer.value = ibuf;
- ret = accept_sec_context (&context_handle, server_creds, &ticket_buffer,
- &client_name, &authenticator_buff);
-
- if (!ret) {
- /* We succesfully acquired the secondary context, now get the
- username for afpd and gss_wrap the sessionkey */
- if ( 0 == (ret = get_client_username(username, ulen, &client_name)) ) {
- ret = wrap_sessionkey(context_handle, sinfo);
- }
-
- if (!ret) {
- /* FIXME: Is copying the authenticator really necessary?
- Where is this documented? */
- u_int16_t auth_len = htons( authenticator_buff.length );
-
- /* copy the authenticator length into the reply buffer */
- memcpy( rbuf, &auth_len, sizeof(auth_len) );
- *rbuflen += sizeof(auth_len);
- rbuf += sizeof(auth_len);
-
- /* copy the authenticator value into the reply buffer */
- memcpy( rbuf, authenticator_buff.value, authenticator_buff.length );
- *rbuflen += authenticator_buff.length;
- }
-
- /* Clean up after ourselves */
- gss_release_name( &status, &client_name );
- if ( authenticator_buff.value)
- gss_release_buffer( &status, &authenticator_buff );
-
- gss_delete_sec_context( &status, &context_handle, NULL );
- }
- gss_release_cred( &status, &server_creds );
+ if ((ret = accept_sec_context(&context_handle, &ticket_buffer,
+ &client_name, &authenticator_buff)))
+ return ret;
-cleanup_vars:
- gss_release_name( &status, &server_name );
+ /* We succesfully acquired the secondary context, now get the
+ username for afpd and gss_wrap the sessionkey */
+ if ((ret = get_client_username(username, ulen, &client_name)))
+ goto cleanup_client_name;
+
+ if ((ret = wrap_sessionkey(context_handle, sinfo)))
+ goto cleanup_client_name;
+
+ /* Authenticated, construct the reply using:
+ * authenticator length (u_int16_t)
+ * authenticator
+ */
+ /* copy the authenticator length into the reply buffer */
+ u_int16_t auth_len = htons( authenticator_buff.length );
+ memcpy( rbuf, &auth_len, sizeof(auth_len) );
+ *rbuflen += sizeof(auth_len);
+ rbuf += sizeof(auth_len);
+
+ /* copy the authenticator value into the reply buffer */
+ memcpy( rbuf, authenticator_buff.value, authenticator_buff.length );
+ *rbuflen += authenticator_buff.length;
+
+cleanup_client_name:
+ gss_release_name( &status, &client_name );
+
+cleanup_context:
+ gss_release_buffer( &status, &authenticator_buff );
+ gss_delete_sec_context( &status, &context_handle, NULL );
return ret;
}
/* -------------------------- */
+
+/*
+ * For the gss uam, this function only needs to return a two-byte
+ * login-session id. None of the data provided by the client up to this
+ * point is trustworthy as we'll have a signed ticket to parse in logincont.
+ */
static int gss_login(void *obj, struct passwd **uam_pwd,
char *ibuf, size_t ibuflen,
char *rbuf, size_t *rbuflen)
{
- u_int16_t temp16;
+ uint16_t temp16;
*rbuflen = 0;
char *rbuf, size_t *rbuflen)
{
struct passwd *pwd = NULL;
- u_int16_t login_id;
+ uint16_t login_id;
char *username;
- u_int16_t ticket_len;
+ uint16_t ticket_len;
char *p;
int rblen;
size_t userlen;
/* Apple's AFP 3.1 documentation specifies that this command
* takes the following format:
* pad (byte)
- * id returned in LoginExt response (u_int16_t)
+ * id returned in LoginExt response (uint16_t)
* username (format unspecified) padded, when necessary, to end on an even boundary
- * ticket length (u_int16_t)
+ * ticket length (uint16_t)
* ticket
*/
* format of this request is as follows:
* pad (byte) [consumed before login_ext is called]
* ?? (byte) - always observed to be 0
- * id returned in LoginExt response (u_int16_t)
+ * id returned in LoginExt response (uint16_t)
* username, encoding unspecified, null terminated C string,
* padded when the terminating null is an even numbered byte.
* The packet is formated such that the username begins on an
* odd numbered byte. Eg if the username is 3 characters and the
* terminating null makes 4, expect to pad the the result.
* The encoding of this string is unknown.
- * ticket length (u_int16_t)
+ * ticket length (uint16_t)
* ticket
*/
/* We skip past the 'username' parameter because all that matters is the ticket */
p = ibuf;
- while( *ibuf && ibuflen ) { ibuf++, ibuflen--; }
+ while ( *ibuf && ibuflen ) { ibuf++, ibuflen--; }
if (ibuflen < 4) {
LOG(log_info, logtype_uams, "uams_gss.c :LoginCont: user is %s, no ticket", p);
return AFPERR_PARAM;
if ((ibuf - p + 1) % 2) ibuf++, ibuflen--; /* deal with potential padding */
- LOG(log_info, logtype_uams, "uams_gss.c :LoginCont: client thinks user is %s", p);
+ LOG(log_debug, logtype_uams, "uams_gss.c :LoginCont: client thinks user is %s", p);
/* get the length of the ticket the client sends us */
memcpy(&ticket_len, ibuf, sizeof(ticket_len));
}
/* now try to authenticate */
- if (!do_gss_auth(obj, ibuf, ticket_len, rbuf, &rblen, username, userlen, sinfo)) {
- /* We use the username we got back from the gssapi client_name.
- Should we compare this to the username the client sent in the clear?
- We know the character encoding of the cleartext username (UTF8), what
- encoding is the gssapi name in? */
- if((pwd = uam_getname( obj, username, userlen )) == NULL) {
- LOG(log_info, logtype_uams, "uam_getname() failed for %s", username);
- return AFPERR_PARAM;
- }
- if (uam_checkuser(pwd) < 0) {
- LOG(log_info, logtype_uams, "%s not a valid user", username);
- return AFPERR_NOTAUTH;
- }
- *rbuflen = rblen;
- *uam_pwd = pwd;
- return AFP_OK;
- } else {
+ if (do_gss_auth(obj, ibuf, ticket_len, rbuf, &rblen, username, userlen, sinfo)) {
LOG(log_info, logtype_uams, "do_gss_auth failed" );
*rbuflen = 0;
return AFPERR_MISC;
}
-}
-
-/*
- * For the krb5 uam, this function only needs to return a two-byte
- * login-session id. None of the data provided by the client up to this
- * point is trustworthy as we'll have a signed ticket to parse in logincont.
- */
-static int gss_login_ext(void *obj, char *uname, struct passwd **uam_pwd,
- char *ibuf, size_t ibuflen,
- char *rbuf, size_t *rbuflen)
-{
- u_int16_t temp16;
-
- *rbuflen = 0;
- /* The reply contains a two-byte ID value - note
- * that Apple's implementation seems to always return 1 as well
- */
- temp16 = htons( 1 );
- memcpy(rbuf, &temp16, sizeof(temp16));
- *rbuflen += sizeof(temp16);
- return AFPERR_AUTHCONT;
+ /* We use the username we got back from the gssapi client_name.
+ Should we compare this to the username the client sent in the clear?
+ We know the character encoding of the cleartext username (UTF8), what
+ encoding is the gssapi name in? */
+ if ((pwd = uam_getname( obj, username, userlen )) == NULL) {
+ LOG(log_info, logtype_uams, "uam_getname() failed for %s", username);
+ return AFPERR_NOTAUTH;
+ }
+ if (uam_checkuser(pwd) < 0) {
+ LOG(log_info, logtype_uams, "%s not a valid user", username);
+ return AFPERR_NOTAUTH;
+ }
+ *rbuflen = rblen;
+ *uam_pwd = pwd;
+ return AFP_OK;
}
/* logout */
static void gss_logout() {
}
-int uam_setup(const char *path)
+static int gss_login_ext(void *obj, char *uname, struct passwd **uam_pwd,
+ char *ibuf, size_t ibuflen,
+ char *rbuf, size_t *rbuflen)
{
- if (uam_register(UAM_SERVER_LOGIN_EXT, path, "Client Krb v2",
- gss_login, gss_logincont, gss_logout, gss_login_ext) < 0)
- if (uam_register(UAM_SERVER_LOGIN, path, "Client Krb v2",
- gss_login, gss_logincont, gss_logout) < 0)
- return -1;
+ return gss_login(obj, uam_pwd, ibuf, ibuflen, rbuf, rbuflen);
+}
- return 0;
+static int uam_setup(const char *path)
+{
+ return uam_register(UAM_SERVER_LOGIN_EXT, path, "Client Krb v2",
+ gss_login, gss_logincont, gss_logout, gss_login_ext);
}
static void uam_cleanup(void)
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