#ifdef HAVE_KRB5
#define DEFAULT_KPASSWD_PORT 464
-#define KRB5_KPASSWD_VERS_CHANGEPW 1
-#define KRB5_KPASSWD_VERS_SETPW 0xff80
-#define KRB5_KPASSWD_ACCESSDENIED 5
-#define KRB5_KPASSWD_BAD_VERSION 6
-
-/* This implements the Kerb password change protocol as specifed in
- * kerb-chg-password-02.txt
+#define KRB5_KPASSWD_VERS_CHANGEPW 1
+#define KRB5_KPASSWD_VERS_SETPW 2
+#define KRB5_KPASSWD_VERS_SETPW_MS 0xff80
+#define KRB5_KPASSWD_ACCESSDENIED 5
+#define KRB5_KPASSWD_BAD_VERSION 6
+#define KRB5_KPASSWD_INITIAL_FLAG_NEEDED 7
+
+/* Those are defined by kerberos-set-passwd-02.txt and are probably
+ * not supported by M$ implementation */
+#define KRB5_KPASSWD_POLICY_REJECT 8
+#define KRB5_KPASSWD_BAD_PRINCIPAL 9
+#define KRB5_KPASSWD_ETYPE_NOSUPP 10
+
+/* This implements kerberos password change protocol as specified in
+ * kerb-chg-password-02.txt and kerberos-set-passwd-02.txt
+ * as well as microsoft version of the protocol
+ * as specified in kerberos-set-passwd-00.txt
*/
static DATA_BLOB encode_krb5_setpw(const char *principal, const char *password)
{
return ret;
}
-static krb5_error_code build_setpw_request(krb5_context context,
+static krb5_error_code build_kpasswd_request(uint16 pversion,
+ krb5_context context,
krb5_auth_context auth_context,
krb5_data *ap_req,
const char *princ,
return ret;
}
- setpw = encode_krb5_setpw(princ, passwd);
+ /* handle protocol differences in chpw and setpw */
+ if (pversion == KRB5_KPASSWD_VERS_CHANGEPW)
+ setpw = data_blob(passwd, strlen(passwd));
+ else if (pversion == KRB5_KPASSWD_VERS_SETPW ||
+ pversion == KRB5_KPASSWD_VERS_SETPW_MS)
+ setpw = encode_krb5_setpw(princ, passwd);
+ else
+ return EINVAL;
- encoded_setpw.data = setpw.data;
+ encoded_setpw.data = (char *)setpw.data;
encoded_setpw.length = setpw.length;
ret = krb5_mk_priv(context, auth_context,
}
packet->data = (char *)malloc(ap_req->length + cipherpw.length + 6);
+ if (!packet->data)
+ return -1;
/* see the RFC for details */
- p = packet->data + 2;
- RSSVAL(p, 0, 0xff80); p += 2;
- RSSVAL(p, 0, ap_req->length); p += 2;
- memcpy(p, ap_req->data, ap_req->length); p += ap_req->length;
- memcpy(p, cipherpw.data, cipherpw.length); p += cipherpw.length;
+ p = ((char *)packet->data) + 2;
+ RSSVAL(p, 0, pversion);
+ p += 2;
+ RSSVAL(p, 0, ap_req->length);
+ p += 2;
+ memcpy(p, ap_req->data, ap_req->length);
+ p += ap_req->length;
+ memcpy(p, cipherpw.data, cipherpw.length);
+ p += cipherpw.length;
packet->length = PTR_DIFF(p,packet->data);
RSSVAL(packet->data, 0, packet->length);
return 0;
}
+static const struct kpasswd_errors {
+ int result_code;
+ const char *error_string;
+} kpasswd_errors[] = {
+ {KRB5_KPASSWD_MALFORMED, "Malformed request error"},
+ {KRB5_KPASSWD_HARDERROR, "Server error"},
+ {KRB5_KPASSWD_AUTHERROR, "Authentication error"},
+ {KRB5_KPASSWD_SOFTERROR, "Password change rejected"},
+ {KRB5_KPASSWD_ACCESSDENIED, "Client does not have proper authorization"},
+ {KRB5_KPASSWD_BAD_VERSION, "Protocol version not supported"},
+ {KRB5_KPASSWD_INITIAL_FLAG_NEEDED, "Authorization ticket must have initial flag set"},
+ {KRB5_KPASSWD_POLICY_REJECT, "Password rejected due to policy requirements"},
+ {KRB5_KPASSWD_BAD_PRINCIPAL, "Target principal does not exist"},
+ {KRB5_KPASSWD_ETYPE_NOSUPP, "Unsupported encryption type"},
+ {0, NULL}
+};
+
+static krb5_error_code setpw_result_code_string(krb5_context context,
+ int result_code,
+ const char **code_string)
+{
+ unsigned int idx = 0;
+
+ while (kpasswd_errors[idx].error_string != NULL) {
+ if (kpasswd_errors[idx].result_code ==
+ result_code) {
+ *code_string = kpasswd_errors[idx].error_string;
+ return 0;
+ }
+ idx++;
+ }
+ *code_string = "Password change failed";
+ return (0);
+}
+
static krb5_error_code parse_setpw_reply(krb5_context context,
krb5_auth_context auth_context,
krb5_data *packet)
p = packet->data;
- if (packet->data[0] == 0x7e || packet->data[0] == 0x5e) {
+ if (((char *)packet->data)[0] == 0x7e || ((char *)packet->data)[0] == 0x5e) {
/* it's an error packet. We should parse it ... */
DEBUG(1,("Got error packet 0x%x from kpasswd server\n",
- packet->data[0]));
+ ((char *)packet->data)[0]));
return KRB5KRB_AP_ERR_MODIFIED;
}
p += 2;
vnum = RSVAL(p, 0); p += 2;
-
- if (vnum != KRB5_KPASSWD_VERS_SETPW && vnum != KRB5_KPASSWD_VERS_CHANGEPW) {
+
+ /* FIXME: According to standard there is only one type of reply */
+ if (vnum != KRB5_KPASSWD_VERS_SETPW &&
+ vnum != KRB5_KPASSWD_VERS_SETPW_MS &&
+ vnum != KRB5_KPASSWD_VERS_CHANGEPW) {
DEBUG(1,("Bad vnum (%d) from kpasswd server\n", vnum));
return KRB5KDC_ERR_BAD_PVNO;
}
ap_rep.length = RSVAL(p, 0); p += 2;
- if (p + ap_rep.length >= packet->data + packet->length) {
+ if (p + ap_rep.length >= (char *)packet->data + packet->length) {
DEBUG(1,("ptr beyond end of packet from kpasswd server\n"));
return KRB5KRB_AP_ERR_MODIFIED;
}
krb5_free_ap_rep_enc_part(context, ap_rep_enc);
cipherresult.data = p;
- cipherresult.length = (packet->data + packet->length) - p;
+ cipherresult.length = ((char *)packet->data + packet->length) - p;
ret = krb5_rd_priv(context, auth_context, &cipherresult, &clearresult,
&replay);
free(clearresult.data);
if ((res_code < KRB5_KPASSWD_SUCCESS) ||
- (res_code >= KRB5_KPASSWD_ACCESSDENIED)) {
+ (res_code > KRB5_KPASSWD_ETYPE_NOSUPP)) {
return KRB5KRB_AP_ERR_MODIFIED;
}
-
- return 0;
+
+ if(res_code == KRB5_KPASSWD_SUCCESS)
+ return 0;
+ else {
+ const char *errstr;
+ setpw_result_code_string(context, res_code, &errstr);
+ DEBUG(1, ("Error changing password: %s\n", errstr));
+
+ switch(res_code) {
+ case KRB5_KPASSWD_ACCESSDENIED:
+ return KRB5KDC_ERR_BADOPTION;
+ break;
+ case KRB5_KPASSWD_INITIAL_FLAG_NEEDED:
+ return KRB5KDC_ERR_BADOPTION;
+ /* return KV5M_ALT_METHOD; MIT-only define */
+ break;
+ case KRB5_KPASSWD_ETYPE_NOSUPP:
+ return KRB5KDC_ERR_ETYPE_NOSUPP;
+ break;
+ case KRB5_KPASSWD_BAD_PRINCIPAL:
+ return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
+ break;
+ case KRB5_KPASSWD_POLICY_REJECT:
+ return KRB5KDC_ERR_POLICY;
+ break;
+ default:
+ return KRB5KRB_ERR_GENERIC;
+ break;
+ }
+ }
}
-ADS_STATUS krb5_set_password(const char *kdc_host, const char *princ, const char *newpw)
+static ADS_STATUS do_krb5_kpasswd_request(krb5_context context,
+ const char *kdc_host,
+ uint16 pversion,
+ krb5_creds *credsp,
+ const char *princ,
+ const char *newpw)
{
- krb5_context context;
krb5_auth_context auth_context = NULL;
- krb5_principal principal;
- char *princ_name;
- char *realm;
- krb5_creds creds, *credsp;
- krb5_ccache ccache;
krb5_data ap_req, chpw_req, chpw_rep;
int ret, sock, addr_len;
struct sockaddr remote_addr, local_addr;
krb5_address local_kaddr, remote_kaddr;
- ret = krb5_init_context(&context);
- if (ret) {
- DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
- return ADS_ERROR_KRB5(ret);
- }
-
- ret = krb5_cc_default(context, &ccache);
- if (ret) {
- krb5_free_context(context);
- DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
- return ADS_ERROR_KRB5(ret);
- }
-
- ZERO_STRUCT(creds);
-
- realm = strchr(princ, '@');
- realm++;
-
- asprintf(&princ_name, "kadmin/changepw@%s", realm);
- ret = krb5_parse_name(context, princ_name, &creds.server);
- if (ret) {
- krb5_free_context(context);
- DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret)));
- return ADS_ERROR_KRB5(ret);
- }
- free(princ_name);
-
- /* parse the principal we got as a function argument */
- ret = krb5_parse_name(context, princ, &principal);
- if (ret) {
- krb5_free_context(context);
- DEBUG(1,("Failed to parse %s (%s)\n", princ_name, error_message(ret)));
- return ADS_ERROR_KRB5(ret);
- }
-
- krb5_princ_set_realm(context, creds.server,
- krb5_princ_realm(context, principal));
-
- ret = krb5_cc_get_principal(context, ccache, &creds.client);
- if (ret) {
- krb5_free_principal(context, principal);
- krb5_free_context(context);
- DEBUG(1,("Failed to get principal from ccache (%s)\n",
- error_message(ret)));
- return ADS_ERROR_KRB5(ret);
- }
-
- ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
- if (ret) {
- krb5_free_principal(context, creds.client);
- krb5_free_principal(context, principal);
- krb5_free_context(context);
- DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret)));
- return ADS_ERROR_KRB5(ret);
- }
-
- /* we might have to call krb5_free_creds(...) from now on ... */
ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY,
NULL, credsp, &ap_req);
if (ret) {
- krb5_free_creds(context, credsp);
- krb5_free_principal(context, creds.client);
- krb5_free_principal(context, principal);
- krb5_free_context(context);
DEBUG(1,("krb5_mk_req_extended failed (%s)\n", error_message(ret)));
return ADS_ERROR_KRB5(ret);
}
if (sock == -1) {
int rc = errno;
free(ap_req.data);
- krb5_free_creds(context, credsp);
- krb5_free_principal(context, creds.client);
- krb5_free_principal(context, principal);
- krb5_free_context(context);
+ krb5_auth_con_free(context, auth_context);
DEBUG(1,("failed to open kpasswd socket to %s (%s)\n",
kdc_host, strerror(errno)));
return ADS_ERROR_SYSTEM(rc);
addr_len = sizeof(local_addr);
getsockname(sock, &local_addr, &addr_len);
- remote_kaddr.addrtype = ADDRTYPE_INET;
- remote_kaddr.length = sizeof(((struct sockaddr_in *)&remote_addr)->sin_addr);
- remote_kaddr.contents = (char *)&(((struct sockaddr_in *)&remote_addr)->sin_addr);
- local_kaddr.addrtype = ADDRTYPE_INET;
- local_kaddr.length = sizeof(((struct sockaddr_in *)&local_addr)->sin_addr);
- local_kaddr.contents = (char *)&(((struct sockaddr_in *)&local_addr)->sin_addr);
+ setup_kaddr(&remote_kaddr, &remote_addr);
+ setup_kaddr(&local_kaddr, &local_addr);
ret = krb5_auth_con_setaddrs(context, auth_context, &local_kaddr, NULL);
if (ret) {
close(sock);
free(ap_req.data);
- krb5_free_creds(context, credsp);
- krb5_free_principal(context, creds.client);
- krb5_free_principal(context, principal);
- krb5_free_context(context);
+ krb5_auth_con_free(context, auth_context);
DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(ret)));
return ADS_ERROR_KRB5(ret);
}
- ret = build_setpw_request(context, auth_context, &ap_req,
+ ret = build_kpasswd_request(pversion, context, auth_context, &ap_req,
princ, newpw, &chpw_req);
if (ret) {
close(sock);
free(ap_req.data);
- krb5_free_creds(context, credsp);
- krb5_free_principal(context, creds.client);
- krb5_free_principal(context, principal);
- krb5_free_context(context);
+ krb5_auth_con_free(context, auth_context);
DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret)));
return ADS_ERROR_KRB5(ret);
}
close(sock);
free(chpw_req.data);
free(ap_req.data);
- krb5_free_creds(context, credsp);
- krb5_free_principal(context, creds.client);
- krb5_free_principal(context, principal);
- krb5_free_context(context);
+ krb5_auth_con_free(context, auth_context);
DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
return ADS_ERROR_SYSTEM(errno);
}
chpw_rep.length = 1500;
chpw_rep.data = (char *) malloc(chpw_rep.length);
+ if (!chpw_rep.data) {
+ close(sock);
+ free(ap_req.data);
+ krb5_auth_con_free(context, auth_context);
+ DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
+ errno = ENOMEM;
+ return ADS_ERROR_SYSTEM(errno);
+ }
ret = read(sock, chpw_rep.data, chpw_rep.length);
if (ret < 0) {
close(sock);
free(chpw_rep.data);
free(ap_req.data);
- krb5_free_creds(context, credsp);
- krb5_free_principal(context, creds.client);
- krb5_free_principal(context, principal);
- krb5_free_context(context);
+ krb5_auth_con_free(context, auth_context);
DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno)));
return ADS_ERROR_SYSTEM(errno);
}
if (ret) {
free(chpw_rep.data);
free(ap_req.data);
- krb5_free_creds(context, credsp);
- krb5_free_principal(context, creds.client);
- krb5_free_principal(context, principal);
- krb5_free_context(context);
+ krb5_auth_con_free(context, auth_context);
DEBUG(1,("krb5_auth_con_setaddrs on reply failed (%s)\n",
error_message(ret)));
return ADS_ERROR_KRB5(ret);
if (ret) {
free(ap_req.data);
- krb5_free_creds(context, credsp);
- krb5_free_principal(context, creds.client);
- krb5_free_principal(context, principal);
- krb5_free_context(context);
+ krb5_auth_con_free(context, auth_context);
DEBUG(1,("parse_setpw_reply failed (%s)\n",
error_message(ret)));
return ADS_ERROR_KRB5(ret);
}
free(ap_req.data);
+ krb5_auth_con_free(context, auth_context);
+
+ return ADS_SUCCESS;
+}
+
+ADS_STATUS ads_krb5_set_password(const char *kdc_host, const char *princ,
+ const char *newpw, int time_offset)
+{
+
+ ADS_STATUS aret;
+ krb5_error_code ret;
+ krb5_context context;
+ krb5_principal principal;
+ char *princ_name;
+ char *realm;
+ krb5_creds creds, *credsp;
+ krb5_ccache ccache;
+
+ ret = krb5_init_context(&context);
+ if (ret) {
+ DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
+ return ADS_ERROR_KRB5(ret);
+ }
+
+ if (time_offset != 0) {
+ krb5_set_real_time(context, time(NULL) + time_offset, 0);
+ }
+
+ ret = krb5_cc_default(context, &ccache);
+ if (ret) {
+ krb5_free_context(context);
+ DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
+ return ADS_ERROR_KRB5(ret);
+ }
+
+ ZERO_STRUCT(creds);
+
+ realm = strchr(princ, '@');
+ realm++;
+
+ asprintf(&princ_name, "kadmin/changepw@%s", realm);
+ ret = krb5_parse_name(context, princ_name, &creds.server);
+ if (ret) {
+ krb5_free_context(context);
+ DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret)));
+ return ADS_ERROR_KRB5(ret);
+ }
+ free(princ_name);
+
+ /* parse the principal we got as a function argument */
+ ret = krb5_parse_name(context, princ, &principal);
+ if (ret) {
+ krb5_free_context(context);
+ DEBUG(1,("Failed to parse %s (%s)\n", princ_name, error_message(ret)));
+ return ADS_ERROR_KRB5(ret);
+ }
+
+ krb5_princ_set_realm(context, creds.server,
+ krb5_princ_realm(context, principal));
+
+ ret = krb5_cc_get_principal(context, ccache, &creds.client);
+ if (ret) {
+ krb5_free_principal(context, principal);
+ krb5_free_context(context);
+ DEBUG(1,("Failed to get principal from ccache (%s)\n",
+ error_message(ret)));
+ return ADS_ERROR_KRB5(ret);
+ }
+
+ ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
+ if (ret) {
+ krb5_free_principal(context, creds.client);
+ krb5_free_principal(context, principal);
+ krb5_free_context(context);
+ DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret)));
+ return ADS_ERROR_KRB5(ret);
+ }
+
+ /* we might have to call krb5_free_creds(...) from now on ... */
+
+ aret = do_krb5_kpasswd_request(context, kdc_host,
+ KRB5_KPASSWD_VERS_SETPW_MS,
+ credsp, princ, newpw);
+
krb5_free_creds(context, credsp);
krb5_free_principal(context, creds.client);
krb5_free_principal(context, principal);
krb5_free_context(context);
- return ADS_SUCCESS;
+ return aret;
+}
+
+/*
+ we use a prompter to avoid a crash bug in the kerberos libs when
+ dealing with empty passwords
+ this prompter is just a string copy ...
+*/
+static krb5_error_code
+kerb_prompter(krb5_context ctx, void *data,
+ const char *name,
+ const char *banner,
+ int num_prompts,
+ krb5_prompt prompts[])
+{
+ if (num_prompts == 0) return 0;
+
+ memset(prompts[0].reply->data, 0, prompts[0].reply->length);
+ if (prompts[0].reply->length > 0) {
+ if (data) {
+ strncpy(prompts[0].reply->data, data, prompts[0].reply->length-1);
+ prompts[0].reply->length = strlen(prompts[0].reply->data);
+ } else {
+ prompts[0].reply->length = 0;
+ }
+ }
+ return 0;
+}
+
+static ADS_STATUS ads_krb5_chg_password(const char *kdc_host,
+ const char *principal,
+ const char *oldpw,
+ const char *newpw,
+ int time_offset)
+{
+ ADS_STATUS aret;
+ krb5_error_code ret;
+ krb5_context context;
+ krb5_principal princ;
+ krb5_get_init_creds_opt opts;
+ krb5_creds creds;
+ char *chpw_princ = NULL, *password;
+
+ ret = krb5_init_context(&context);
+ if (ret) {
+ DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
+ return ADS_ERROR_KRB5(ret);
+ }
+
+ if ((ret = krb5_parse_name(context, principal,
+ &princ))) {
+ krb5_free_context(context);
+ DEBUG(1,("Failed to parse %s (%s)\n", principal, error_message(ret)));
+ return ADS_ERROR_KRB5(ret);
+ }
+
+ krb5_get_init_creds_opt_init(&opts);
+ krb5_get_init_creds_opt_set_tkt_life(&opts, 5*60);
+ krb5_get_init_creds_opt_set_renew_life(&opts, 0);
+ krb5_get_init_creds_opt_set_forwardable(&opts, 0);
+ krb5_get_init_creds_opt_set_proxiable(&opts, 0);
+
+ /* We have to obtain an INITIAL changepw ticket for changing password */
+ asprintf(&chpw_princ, "kadmin/changepw@%s",
+ (char *) krb5_princ_realm(context, princ));
+ password = strdup(oldpw);
+ ret = krb5_get_init_creds_password(context, &creds, princ, password,
+ kerb_prompter, NULL,
+ 0, chpw_princ, &opts);
+ SAFE_FREE(chpw_princ);
+ SAFE_FREE(password);
+
+ if (ret) {
+ if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
+ DEBUG(1,("Password incorrect while getting initial ticket"));
+ else
+ DEBUG(1,("krb5_get_init_creds_password failed (%s)\n", error_message(ret)));
+
+ krb5_free_principal(context, princ);
+ krb5_free_context(context);
+ return ADS_ERROR_KRB5(ret);
+ }
+
+ aret = do_krb5_kpasswd_request(context, kdc_host,
+ KRB5_KPASSWD_VERS_CHANGEPW,
+ &creds, principal, newpw);
+
+ krb5_free_principal(context, princ);
+ krb5_free_context(context);
+
+ return aret;
}
ADS_STATUS kerberos_set_password(const char *kpasswd_server,
const char *auth_principal, const char *auth_password,
- const char *target_principal, const char *new_password)
+ const char *target_principal, const char *new_password,
+ int time_offset)
{
int ret;
- if ((ret = kerberos_kinit_password(auth_principal, auth_password))) {
+ if ((ret = kerberos_kinit_password(auth_principal, auth_password, time_offset))) {
DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal, error_message(ret)));
return ADS_ERROR_KRB5(ret);
}
- return krb5_set_password(kpasswd_server, target_principal, new_password);
+ if (!strcmp(auth_principal, target_principal))
+ return ads_krb5_chg_password(kpasswd_server, target_principal,
+ auth_password, new_password, time_offset);
+ else
+ return ads_krb5_set_password(kpasswd_server, target_principal,
+ new_password, time_offset);
+}
+
+
+/**
+ * Set the machine account password
+ * @param ads connection to ads server
+ * @param hostname machine whose password is being set
+ * @param password new password
+ * @return status of password change
+ **/
+ADS_STATUS ads_set_machine_password(ADS_STRUCT *ads,
+ const char *machine_account,
+ const char *password)
+{
+ ADS_STATUS status;
+ char *principal = NULL;
+
+ /*
+ we need to use the '$' form of the name here (the machine account name),
+ as otherwise the server might end up setting the password for a user
+ instead
+ */
+ asprintf(&principal, "%s@%s", machine_account, ads->config.realm);
+
+ status = ads_krb5_set_password(ads->auth.kdc_server, principal,
+ password, ads->auth.time_offset);
+
+ free(principal);
+
+ return status;
}
+
#endif
git.samba.org / tprouty / samba.git / blobdiff