#include "config.h"
#endif /* HAVE_CONFIG_H */
+#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <arpa/inet.h>
+#ifdef HAVE_KERBEROS
+#ifdef HAVE_KRB5_KRB5_H
+#include <krb5/krb5.h>
+#else
+#include <krb5.h>
+#endif /* HAVE_KRB5_KRB5_H */
+#endif /* HAVE_KERBEROS */
+
#include <atalk/dsi.h>
#include <atalk/unicode.h>
#include <atalk/util.h>
#include "status.h"
#include "afp_config.h"
#include "icon.h"
+#include "uam_auth.h"
static size_t maxstatuslen = 0;
-static void status_flags(char *data, const int notif, const int ipok,
- const unsigned char passwdbits, const int dirsrvcs _U_, int flags)
+static int uam_gss_enabled()
+{
+ /* XXX: must be a better way to find out if uam_gss is active */
+ return auth_uamfind(UAM_SERVER_LOGIN_EXT,
+ "Client Krb v2",
+ sizeof("Client Krb v2")) != NULL;
+}
+
+static void status_flags(char *data,
+ const int notif,
+ const int ipok,
+ const unsigned char passwdbits,
+ const int dirsrvcs,
+ int flags)
{
uint16_t status;
| AFPSRVRINFO_SRVSIGNATURE
| AFPSRVRINFO_SRVMSGS
| AFPSRVRINFO_FASTBOZO
- | AFPSRVRINFO_SRVRDIR
| AFPSRVRINFO_SRVUTF8
| AFPSRVRINFO_EXTSLEEP;
status |= AFPSRVRINFO_PASSWD;
if (passwdbits & PASSWD_NOSAVE)
status |= AFPSRVRINFO_NOSAVEPASSWD;
- if (ipok) /* only advertise tcp/ip if we have a valid address */
+ if (ipok) /* only advertise tcp/ip if we have a valid address */
status |= AFPSRVRINFO_TCPIP;
- if (notif) /* Default is yes */
+ if (notif) /* Default is yes */
status |= AFPSRVRINFO_SRVNOTIFY;
+ if (dirsrvcs)
+ status |= AFPSRVRINFO_SRVRDIR;
if (flags & OPTION_UUID)
status |= AFPSRVRINFO_UUID;
return (data - begin);
}
-static size_t status_directorynames(char *data, int *diroffset,
- const DSI *dsi _U_,
- const struct afp_options *options)
+static bool append_directoryname(char **pdata,
+ size_t offset,
+ size_t *size,
+ char* DirectoryNamesCount,
+ size_t len,
+ char *principal)
+{
+ if (sizeof(uint8_t) + len > maxstatuslen - offset - *size) {
+ LOG(log_error, logtype_afpd,
+ "status:DirectoryNames: out of space for principal '%s' (len=%d)",
+ principal, len);
+ return false;
+ } else if (len > 255) {
+ LOG(log_error, logtype_afpd,
+ "status:DirectoryNames: principal '%s' (len=%d) too long (max=255)",
+ principal, len);
+ return false;
+ }
+
+ LOG(log_info, logtype_afpd,
+ "DirectoryNames[%d]=%s",
+ *DirectoryNamesCount, principal);
+
+ *DirectoryNamesCount += 1;
+ char *data = *pdata;
+ *data++ = len;
+ strncpy(data, principal, len);
+
+ *pdata += len;
+ *size += sizeof(uint8_t) + len;
+
+ return true;
+}
+
+/**
+ * DirectoryNamesCount offset: uint16_t
+ * ...
+ * DirectoryNamesCount: uint8_t
+ * DirectoryNames: list of UTF-8 Pascal strings (uint8_t + char[1,255])
+ */
+static size_t status_directorynames(char *data,
+ int *diroffset,
+ const DSI *dsi _U_,
+ const struct afp_options *options _U_)
{
char *begin = data;
uint16_t offset;
- memcpy(&offset, data + *diroffset, sizeof(offset));
+
+ memcpy(&offset, begin + *diroffset, sizeof(offset));
offset = ntohs(offset);
data += offset;
- /* I can not find documentation of any other purpose for the
- * DirectoryNames field.
- */
- /*
- * Try to synthesize a principal:
- * service '/' fqdn '@' realm
- */
- if (options->k5service && options->k5realm && options->fqdn) {
- /* should k5princ be utf8 encoded? */
- size_t len;
- char *p = strchr( options->fqdn, ':' );
- if (p)
- *p = '\0';
- len = strlen( options->k5service )
- + strlen( options->fqdn )
- + strlen( options->k5realm );
- len+=2; /* '/' and '@' */
- if ( len > 255 || len+2 > maxstatuslen - offset) {
- *data++ = 0;
- LOG ( log_error, logtype_afpd, "status: could not set directory service list, no more room");
- }
- else {
- *data++ = 1; /* DirectoryNamesCount */
- *data++ = len;
- snprintf( data, len + 1, "%s/%s@%s", options->k5service,
- options->fqdn, options->k5realm );
- data += len;
- if (p)
- *p = ':';
- }
+ char *DirectoryNamesCount = data++, *DirectoryNames = data;
+ *DirectoryNamesCount = 0;
+ size_t size = sizeof(uint8_t);
+
+ if (!uam_gss_enabled())
+ goto offset_calc;
+
+#ifdef HAVE_KERBEROS
+ krb5_context context;
+ krb5_error_code ret;
+ const char *error_msg;
+
+ if (krb5_init_context(&context)) {
+ LOG(log_error, logtype_afpd,
+ "status:DirectoryNames failed to intialize a krb5_context");
+ goto offset_calc;
+ }
+
+ krb5_keytab keytab;
+ if ((ret = krb5_kt_default(context, &keytab)))
+ goto krb5_error;
+
+ // figure out which service principal to use
+ krb5_keytab_entry entry;
+ char *principal;
+ if (options->k5service && options->fqdn && options->k5realm) {
+ LOG(log_debug, logtype_afpd,
+ "status:DirectoryNames: using service principal specified in options");
+
+ krb5_principal service_principal;
+ if ((ret = krb5_build_principal(context,
+ &service_principal,
+ strlen(options->k5realm),
+ options->k5realm,
+ options->k5service,
+ options->fqdn,
+ NULL)))
+ goto krb5_error;
+
+ // try to get the given service principal from keytab
+ ret = krb5_kt_get_entry(context,
+ keytab,
+ service_principal,
+ 0, // kvno - wildcard
+ 0, // enctype - wildcard
+ &entry);
+ if (ret == KRB5_KT_NOTFOUND) {
+ krb5_unparse_name(context, service_principal, &principal);
+ LOG(log_error, logtype_afpd,
+ "status:DirectoryNames: specified service principal '%s' not found in keytab",
+ principal);
+ // XXX: should this be krb5_xfree?
+ krb5_free_unparsed_name(context, principal);
+ goto krb5_cleanup;
+ }
+ krb5_free_principal(context, service_principal);
+ if (ret)
+ goto krb5_error;
} else {
- *data++ = 0;
+ LOG(log_debug, logtype_afpd,
+ "status:DirectoryNames: using first entry from keytab as service principal");
+
+ krb5_kt_cursor cursor;
+ if ((ret = krb5_kt_start_seq_get(context, keytab, &cursor)))
+ goto krb5_error;
+
+ ret = krb5_kt_next_entry(context, keytab, &entry, &cursor);
+ krb5_kt_end_seq_get(context, keytab, &cursor);
+ if (ret)
+ goto krb5_error;
+ }
+
+ krb5_unparse_name(context, entry.principal, &principal);
+ krb5_kt_free_entry(context, &entry);
+
+ append_directoryname(&data,
+ offset,
+ &size,
+ DirectoryNamesCount,
+ strlen(principal),
+ principal);
+
+ // XXX: should this be krb5_xfree?
+ krb5_free_unparsed_name(context, principal);
+ goto krb5_cleanup;
+
+krb5_error:
+ if (ret) {
+ error_msg = krb5_get_error_message(context, ret);
+ LOG(log_error, logtype_afpd,
+ "status:DirectoryNames: Kerberos error: %s",
+ (char *) error_msg);
+ krb5_free_error_message(context, error_msg);
}
+krb5_cleanup:
+ krb5_kt_close(context, keytab);
+ krb5_free_context(context);
+#else
+ if (!options->k5service || !options->fqdn || !options->k5realm)
+ goto offset_calc;
+
+ char principal[255];
+ size_t len = snprintf(principal, sizeof(principal), "%s/%s@%s",
+ options->k5service, options->fqdn, options->k5realm);
+
+ append_directoryname(&data,
+ offset,
+ &size,
+ DirectoryNamesCount,
+ strlen(principal),
+ principal);
+#endif // HAVE_KERBEROS
+
+offset_calc:
/* Calculate and store offset for UTF8ServerName */
*diroffset += sizeof(uint16_t);
offset = htons(data - begin);
options->flags & OPTION_SERVERNOTIF,
(options->fqdn || ipok),
options->passwdbits,
- (options->k5service && options->k5realm && options->fqdn),
+ uam_gss_enabled(),
options->flags);
/* returns offset to signature offset */
c = status_server(status, options->hostname, options);
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