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path: root/source3/libads/krb5_setpw.c
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Diffstat (limited to 'source3/libads/krb5_setpw.c')
-rw-r--r--source3/libads/krb5_setpw.c428
1 files changed, 305 insertions, 123 deletions
diff --git a/source3/libads/krb5_setpw.c b/source3/libads/krb5_setpw.c
index 087b0e9a71..c3ec754e39 100644
--- a/source3/libads/krb5_setpw.c
+++ b/source3/libads/krb5_setpw.c
@@ -24,13 +24,23 @@
#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)
{
@@ -101,7 +111,8 @@ 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,
@@ -123,7 +134,14 @@ static krb5_error_code build_setpw_request(krb5_context context,
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.length = setpw.length;
@@ -144,7 +162,7 @@ static krb5_error_code build_setpw_request(krb5_context context,
/* see the RFC for details */
p = ((char *)packet->data) + 2;
- RSSVAL(p, 0, 0xff80);
+ RSSVAL(p, 0, pversion);
p += 2;
RSSVAL(p, 0, ap_req->length);
p += 2;
@@ -160,6 +178,49 @@ static krb5_error_code build_setpw_request(krb5_context context,
return 0;
}
+static krb5_error_code krb5_setpw_result_code_string(krb5_context context,
+ int result_code,
+ char **code_string)
+{
+ switch (result_code) {
+ case KRB5_KPASSWD_MALFORMED:
+ *code_string = "Malformed request error";
+ break;
+ case KRB5_KPASSWD_HARDERROR:
+ *code_string = "Server error";
+ break;
+ case KRB5_KPASSWD_AUTHERROR:
+ *code_string = "Authentication error";
+ break;
+ case KRB5_KPASSWD_SOFTERROR:
+ *code_string = "Password change rejected";
+ break;
+ case KRB5_KPASSWD_ACCESSDENIED:
+ *code_string = "Client does not have proper authorization";
+ break;
+ case KRB5_KPASSWD_BAD_VERSION:
+ *code_string = "Protocol version not supported";
+ break;
+ case KRB5_KPASSWD_INITIAL_FLAG_NEEDED:
+ *code_string = "Authorization ticket must have initial flag set";
+ break;
+ case KRB5_KPASSWD_POLICY_REJECT:
+ *code_string = "Password rejected due to policy requirements";
+ break;
+ case KRB5_KPASSWD_BAD_PRINCIPAL:
+ *code_string = "Target principal does not exist";
+ break;
+ case KRB5_KPASSWD_ETYPE_NOSUPP:
+ *code_string = "Unsupported encryption type";
+ break;
+ default:
+ *code_string = "Password change failed";
+ break;
+ }
+
+ return(0);
+}
+
static krb5_error_code parse_setpw_reply(krb5_context context,
krb5_auth_context auth_context,
krb5_data *packet)
@@ -194,8 +255,11 @@ static krb5_error_code parse_setpw_reply(krb5_context context,
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;
}
@@ -247,96 +311,56 @@ static krb5_error_code parse_setpw_reply(krb5_context context,
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 {
+ char *errstr;
+ krb5_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 KV5M_ALT_METHOD;
+ 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,
- int time_offset)
+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);
- }
-
- 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 ... */
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);
}
@@ -345,10 +369,7 @@ ADS_STATUS krb5_set_password(const char *kdc_host, const char *princ, const char
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);
@@ -366,23 +387,17 @@ ADS_STATUS krb5_set_password(const char *kdc_host, const char *princ, const char
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);
}
@@ -391,10 +406,7 @@ ADS_STATUS krb5_set_password(const char *kdc_host, const char *princ, const char
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);
}
@@ -406,10 +418,7 @@ ADS_STATUS krb5_set_password(const char *kdc_host, const char *princ, const char
if (!chpw_rep.data) {
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,("send of chpw failed (%s)\n", strerror(errno)));
errno = ENOMEM;
return ADS_ERROR_SYSTEM(errno);
@@ -420,10 +429,7 @@ ADS_STATUS krb5_set_password(const char *kdc_host, const char *princ, const char
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);
}
@@ -435,10 +441,7 @@ ADS_STATUS krb5_set_password(const char *kdc_host, const char *princ, const char
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);
@@ -449,22 +452,194 @@ ADS_STATUS krb5_set_password(const char *kdc_host, const char *princ, const char
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 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, creds.server);
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;
+}
+
+ADS_STATUS 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;
}
@@ -480,7 +655,12 @@ ADS_STATUS kerberos_set_password(const char *kpasswd_server,
return ADS_ERROR_KRB5(ret);
}
- return krb5_set_password(kpasswd_server, target_principal, new_password, time_offset);
+ if (!strcmp(auth_principal, target_principal))
+ return krb5_chg_password(kpasswd_server, target_principal,
+ auth_password, new_password, time_offset);
+ else
+ return krb5_set_password(kpasswd_server, target_principal,
+ new_password, time_offset);
}
@@ -515,4 +695,6 @@ ADS_STATUS ads_set_machine_password(ADS_STRUCT *ads,
return status;
}
+
+
#endif