diff options
Diffstat (limited to 'gssapi.c')
| -rw-r--r-- | gssapi.c | 83 |
1 files changed, 64 insertions, 19 deletions
@@ -69,38 +69,83 @@ static void decode_status(const char *m, uint32_t major, uint32_t minor) #define GSSAUTH_P_INTEGRITY 2 #define GSSAUTH_P_PRIVACY 4 -int do_gssauth(int sock, const char *command, const char *service, - const char *hostname, const char *username) +static int import_name(const char *service, const char *hostname, + gss_name_t *target_name, flag verbose) { - 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; + char *buf1; + size_t buf1siz; OM_uint32 maj_stat, min_stat; - char buf1[8192], buf2[8192], server_conf_flags; - unsigned long buf_size; - int result; + gss_buffer_desc request_buf; /* first things first: get an imap ticket for host */ - snprintf(buf1, sizeof(buf1), "%s@%s", service, hostname); + 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); + 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); report(stderr, GT_("Couldn't get service name for [%s]\n"), buf1); return PS_AUTHFAIL; } - else if (outlevel >= O_DEBUG) { - gss_display_name(&min_stat, target_name, &request_buf, &mech_name); + 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); - gss_release_buffer(&min_stat, &request_buf); } + (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; + int result; + + result = 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); + report(stderr, GT_("No suitable GSSAPI credentials found. Skipping GSSAPI authentication.\n")); + report(stderr, 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_qop_t quality; + int cflags; + OM_uint32 maj_stat, min_stat; + char buf1[8192], buf2[8192], server_conf_flags; + unsigned long buf_size; + int result; + + result = import_name(service, hostname, &target_name, TRUE); + if (result) + return result; gen_send(sock, "%s GSSAPI", command); @@ -133,7 +178,7 @@ int do_gssauth(int sock, const char *command, const char *service, NULL); if (maj_stat!=GSS_S_COMPLETE && maj_stat!=GSS_S_CONTINUE_NEEDED) { decode_status("gss_init_sec_context", maj_stat, min_stat); - gss_release_name(&min_stat, &target_name); + (void)gss_release_name(&min_stat, &target_name); report(stderr, GT_("Error exchanging credentials\n")); /* wake up server and await NO response */ |