#include "socket.h"
#include "i18n.h"
-#include "md5.h"
+#include "fm_md5.h"
+
+#include <sys/types.h>
+#include <netinet/in.h> /* for htonl/ntohl */
#ifdef GSSAPI
-# ifdef HAVE_GSSAPI_H
+# ifdef HAVE_GSS_H
+# include <gss.h>
+# else
+# if defined(HAVE_GSSAPI_H) && !defined(HAVE_GSSAPI_GSSAPI_H)
# include <gssapi.h>
# endif
# ifdef HAVE_GSSAPI_GSSAPI_H
# ifdef HAVE_GSSAPI_GSSAPI_GENERIC_H
# include <gssapi/gssapi_generic.h>
# endif
-# ifndef HAVE_GSS_C_NT_HOSTBASED_SERVICE
+# if HAVE_DECL_GSS_C_NT_HOSTBASED_SERVICE + 0 == 0
# define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
# endif
+# endif
+
+static void decode_subr(const char *m, uint32_t code, int type, FILE *ostrm)
+{
+ uint32_t maj, min, context;
+ gss_buffer_desc msg = GSS_C_EMPTY_BUFFER;
+
+ context = 0;
+ do {
+ maj = gss_display_status(&min, code, type, GSS_C_NO_OID,
+ &context, &msg);
+
+ if (maj != GSS_S_COMPLETE) {
+ report(stderr, GT_("GSSAPI error in gss_display_status called from <%s>\n"), m);
+ break;
+ }
+ report(ostrm, GT_("GSSAPI error %s: %.*s\n"), m,
+ (int)msg.length, (char *)msg.value);
+ (void)gss_release_buffer(&min, &msg);
+ } while(context);
+}
+
+static void decode_status(const char *m, uint32_t major, uint32_t minor,
+ FILE *ostrm)
+{
+ decode_subr(m, major, GSS_C_GSS_CODE, ostrm);
+ decode_subr(m, minor, GSS_C_MECH_CODE, ostrm);
+}
#define GSSAUTH_P_NONE 1
#define GSSAUTH_P_INTEGRITY 2
#define GSSAUTH_P_PRIVACY 4
-int do_gssauth(int sock, char *command, char *hostname, char *username)
+static int import_name(const char *service, const char *hostname,
+ gss_name_t *target_name, flag verbose)
+{
+ char *buf1;
+ size_t buf1siz;
+ OM_uint32 maj_stat, min_stat;
+ gss_buffer_desc request_buf;
+
+ /* first things first: get an imap ticket for host */
+ buf1siz = strlen(service) + 1 + strlen(hostname) + 1;
+ buf1 = (char *)xmalloc(buf1siz);
+ snprintf(buf1, buf1siz, "%s@%s", service, hostname);
+ request_buf.value = buf1;
+ request_buf.length = strlen(buf1) + 1;
+ maj_stat = gss_import_name(&min_stat, &request_buf,
+ GSS_C_NT_HOSTBASED_SERVICE, target_name);
+ if (maj_stat != GSS_S_COMPLETE) {
+ decode_status("gss_import_name", maj_stat, min_stat, stderr);
+ report(stderr, GT_("Couldn't get service name for [%s]\n"), buf1);
+ return PS_AUTHFAIL;
+ }
+ else if (outlevel >= O_DEBUG && verbose) {
+ (void)gss_display_name(&min_stat, *target_name, &request_buf, NULL);
+ report(stderr, GT_("Using service name [%s]\n"),
+ (char *)request_buf.value);
+ }
+ (void)gss_release_buffer(&min_stat, &request_buf);
+
+ return PS_SUCCESS;
+}
+
+/* If we don't have suitable credentials, don't bother trying GSSAPI, but
+ * fail right away. This is to avoid that a server - such as Microsoft
+ * Exchange 2007 - gets wedged and refuses different authentication
+ * mechanisms afterwards. */
+int check_gss_creds(const char *service, const char *hostname)
+{
+ OM_uint32 maj_stat, min_stat;
+ gss_cred_usage_t cu;
+ gss_name_t target_name;
+
+ (void)import_name(service, hostname, &target_name, FALSE);
+ (void)gss_release_name(&min_stat, &target_name);
+
+ maj_stat = gss_inquire_cred(&min_stat, GSS_C_NO_CREDENTIAL,
+ NULL, NULL, &cu, NULL);
+ if (maj_stat != GSS_S_COMPLETE
+ || (cu != GSS_C_INITIATE && cu != GSS_C_BOTH)) {
+ if (outlevel >= O_DEBUG) {
+ decode_status("gss_inquire_cred", maj_stat, min_stat, stdout);
+ report(stdout, GT_("No suitable GSSAPI credentials found. Skipping GSSAPI authentication.\n"));
+ report(stdout, GT_("If you want to use GSSAPI, you need credentials first, possibly from kinit.\n"));
+ }
+ return PS_AUTHFAIL;
+ }
+
+ return PS_SUCCESS;
+}
+
+int do_gssauth(int sock, const char *command, const char *service,
+ const char *hostname, const char *username)
{
gss_buffer_desc request_buf, send_token;
gss_buffer_t sec_token;
gss_name_t target_name;
gss_ctx_id_t context;
- gss_OID mech_name;
gss_qop_t quality;
int cflags;
OM_uint32 maj_stat, min_stat;
unsigned long buf_size;
int result;
- /* first things first: get an imap ticket for host */
- sprintf(buf1, "imap@%s", hostname);
- request_buf.value = buf1;
- request_buf.length = strlen(buf1) + 1;
- maj_stat = gss_import_name(&min_stat, &request_buf, GSS_C_NT_HOSTBASED_SERVICE,
- &target_name);
- if (maj_stat != GSS_S_COMPLETE) {
- report(stderr, _("Couldn't get service name for [%s]\n"), buf1);
- return PS_AUTHFAIL;
- }
- else if (outlevel >= O_DEBUG) {
- maj_stat = gss_display_name(&min_stat, target_name, &request_buf,
- &mech_name);
- report(stderr, _("Using service name [%s]\n"),request_buf.value);
- maj_stat = gss_release_buffer(&min_stat, &request_buf);
- }
+ result = import_name(service, hostname, &target_name, TRUE);
+ if (result)
+ return result;
gen_send(sock, "%s GSSAPI", command);
/* upon receipt of the GSSAPI authentication request, server returns
- * null data ready response. */
- if (result = gen_recv(sock, buf1, sizeof buf1)) {
- return result;
+ * a null data ready challenge to us. */
+ result = gen_recv(sock, buf1, sizeof buf1);
+ if (result)
+ return result;
+
+ if (buf1[0] != '+' || strspn(buf1 + 1, " \t") < strlen(buf1 + 1)) {
+ if (outlevel >= O_VERBOSE) {
+ report(stdout, GT_("Received malformed challenge to \"%s GSSAPI\"!\n"), command);
+ }
+ goto cancelfail;
}
+
/* now start the security context initialisation loop... */
sec_token = GSS_C_NO_BUFFER;
context = GSS_C_NO_CONTEXT;
if (outlevel >= O_VERBOSE)
- report(stdout, _("Sending credentials\n"));
+ report(stdout, GT_("Sending credentials\n"));
do {
- send_token.length = 0;
+ send_token.length = 0;
send_token.value = NULL;
- maj_stat = gss_init_sec_context(&min_stat,
- GSS_C_NO_CREDENTIAL,
- &context,
- target_name,
- GSS_C_NO_OID,
- GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG,
- 0,
- GSS_C_NO_CHANNEL_BINDINGS,
- sec_token,
- NULL,
- &send_token,
- NULL,
+ maj_stat = gss_init_sec_context(&min_stat,
+ GSS_C_NO_CREDENTIAL,
+ &context,
+ target_name,
+ GSS_C_NO_OID,
+ GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG,
+ 0,
+ GSS_C_NO_CHANNEL_BINDINGS,
+ sec_token,
+ NULL,
+ &send_token,
+ NULL,
NULL);
- if (maj_stat!=GSS_S_COMPLETE && maj_stat!=GSS_S_CONTINUE_NEEDED) {
- report(stderr, _("Error exchanging credentials\n"));
- gss_release_name(&min_stat, &target_name);
- /* wake up server and await NO response */
- SockWrite(sock, "\r\n", 2);
- if (result = gen_recv(sock, buf1, sizeof buf1))
- return result;
- return PS_AUTHFAIL;
- }
- to64frombits(buf1, send_token.value, send_token.length);
- gss_release_buffer(&min_stat, &send_token);
+
+ if (maj_stat!=GSS_S_COMPLETE && maj_stat!=GSS_S_CONTINUE_NEEDED) {
+ if (outlevel >= O_VERBOSE)
+ decode_status("gss_init_sec_context", maj_stat, min_stat, stdout);
+ (void)gss_release_name(&min_stat, &target_name);
+
+cancelfail:
+ /* wake up server and cancel authentication */
+ suppress_tags = TRUE;
+ gen_send(sock, "*");
+ suppress_tags = FALSE;
+
+ result = gen_recv(sock, buf1, sizeof buf1);
+ if (outlevel >= O_VERBOSE)
+ report(stderr, GT_("Error exchanging credentials\n"));
+ if (result)
+ return result;
+ return PS_AUTHFAIL;
+ }
+ to64frombits(buf1, send_token.value, send_token.length);
+ gss_release_buffer(&min_stat, &send_token);
suppress_tags = TRUE;
- gen_send(sock, buf1, strlen(buf1));
+ gen_send(sock, "%s", buf1);
suppress_tags = FALSE;
if (maj_stat == GSS_S_CONTINUE_NEEDED) {
- if (result = gen_recv(sock, buf1, sizeof buf1)) {
+ result = gen_recv(sock, buf1, sizeof buf1);
+ if (result) {
gss_release_name(&min_stat, &target_name);
return result;
}
- request_buf.length = from64tobits(buf2, buf1 + 2);
+ request_buf.length = from64tobits(buf2, buf1 + 2, sizeof(buf2));
+ if ((int)request_buf.length == -1) /* in case of bad data */
+ request_buf.length = 0;
request_buf.value = buf2;
sec_token = &request_buf;
}
gss_release_name(&min_stat, &target_name);
/* get security flags and buffer size */
- if (result = gen_recv(sock, buf1, sizeof buf1))
+ result = gen_recv(sock, buf1, sizeof buf1);
+ if (result)
return result;
- request_buf.length = from64tobits(buf2, buf1 + 2);
+ request_buf.length = from64tobits(buf2, buf1 + 2, sizeof(buf2));
+ if ((int)request_buf.length == -1) /* in case of bad data */
+ request_buf.length = 0;
request_buf.value = buf2;
- maj_stat = gss_unwrap(&min_stat, context,
+ maj_stat = gss_unwrap(&min_stat, context,
&request_buf, &send_token, &cflags, &quality);
if (maj_stat != GSS_S_COMPLETE) {
- report(stderr, _("Couldn't unwrap security level data\n"));
+ decode_status("gss_unwrap", maj_stat, min_stat, stderr);
+ report(stderr, GT_("Couldn't unwrap security level data\n"));
gss_release_buffer(&min_stat, &send_token);
return PS_AUTHFAIL;
}
if (outlevel >= O_DEBUG)
- report(stdout, _("Credential exchange complete\n"));
+ report(stdout, GT_("Credential exchange complete\n"));
/* first octet is security levels supported. We want none, for now */
server_conf_flags = ((char *)send_token.value)[0];
if ( !(((char *)send_token.value)[0] & GSSAUTH_P_NONE) ) {
- report(stderr, _("Server requires integrity and/or privacy\n"));
+ report(stderr, GT_("Server requires integrity and/or privacy\n"));
gss_release_buffer(&min_stat, &send_token);
return PS_AUTHFAIL;
}
/* we don't care about buffer size if we don't wrap data */
gss_release_buffer(&min_stat, &send_token);
if (outlevel >= O_DEBUG) {
- report(stdout, _("Unwrapped security level flags: %s%s%s\n"),
+ report(stdout, GT_("Unwrapped security level flags: %s%s%s\n"),
server_conf_flags & GSSAUTH_P_NONE ? "N" : "-",
server_conf_flags & GSSAUTH_P_INTEGRITY ? "I" : "-",
server_conf_flags & GSSAUTH_P_PRIVACY ? "C" : "-");
- report(stdout, _("Maximum GSS token size is %ld\n"),buf_size);
+ report(stdout, GT_("Maximum GSS token size is %ld\n"),buf_size);
}
/* now respond in kind (hack!!!) */
buf_size = htonl(buf_size); /* do as they do... only matters if we do enc */
memcpy(buf1, &buf_size, 4);
buf1[0] = GSSAUTH_P_NONE;
- strcpy(buf1+4, username); /* server decides if princ is user */
+ strlcpy(buf1+4, username, sizeof(buf1) - 4); /* server decides if princ is user */
request_buf.length = 4 + strlen(username) + 1;
request_buf.value = buf1;
maj_stat = gss_wrap(&min_stat, context, 0, GSS_C_QOP_DEFAULT, &request_buf,
&cflags, &send_token);
if (maj_stat != GSS_S_COMPLETE) {
- report(stderr, _("Error creating security level request\n"));
+ report(stderr, GT_("Error creating security level request\n"));
return PS_AUTHFAIL;
}
to64frombits(buf1, send_token.value, send_token.length);
suppress_tags = TRUE;
- result = gen_transact(sock, buf1, strlen(buf));
+ result = gen_transact(sock, "%s", buf1);
suppress_tags = FALSE;
/* flush security context */
if (outlevel >= O_DEBUG)
- report(stdout, _("Releasing GSS credentials\n"));
+ report(stdout, GT_("Releasing GSS credentials\n"));
maj_stat = gss_delete_sec_context(&min_stat, &context, &send_token);
if (maj_stat != GSS_S_COMPLETE) {
- report(stderr, _("Error releasing credentials\n"));
+ decode_status("gss_delete_sec_context", maj_stat, min_stat, stderr);
+ report(stderr, GT_("Error releasing credentials\n"));
return PS_AUTHFAIL;
}
/* send_token may contain a notification to the server to flush
projects / ~andy / fetchmail / blobdiff