diff options
Diffstat (limited to 'source3/libads/krb5_setpw.c')
| -rw-r--r-- | source3/libads/krb5_setpw.c | 428 |
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 |