Annotation of embedaddon/strongswan/src/libcharon/plugins/xauth_pam/xauth_pam.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2012 Martin Willi
! 3: * Copyright (C) 2012 revosec AG
! 4: *
! 5: * This program is free software; you can redistribute it and/or modify it
! 6: * under the terms of the GNU General Public License as published by the
! 7: * Free Software Foundation; either version 2 of the License, or (at your
! 8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
! 9: *
! 10: * This program is distributed in the hope that it will be useful, but
! 11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
! 13: * for more details.
! 14: */
! 15:
! 16: #include "xauth_pam.h"
! 17:
! 18: #include <daemon.h>
! 19: #include <library.h>
! 20:
! 21: #include <security/pam_appl.h>
! 22:
! 23: typedef struct private_xauth_pam_t private_xauth_pam_t;
! 24:
! 25: /**
! 26: * Private data of an xauth_pam_t object.
! 27: */
! 28: struct private_xauth_pam_t {
! 29:
! 30: /**
! 31: * Public interface.
! 32: */
! 33: xauth_pam_t public;
! 34:
! 35: /**
! 36: * ID of the peer
! 37: */
! 38: identification_t *peer;
! 39: };
! 40:
! 41: METHOD(xauth_method_t, initiate, status_t,
! 42: private_xauth_pam_t *this, cp_payload_t **out)
! 43: {
! 44: cp_payload_t *cp;
! 45:
! 46: cp = cp_payload_create_type(PLV1_CONFIGURATION, CFG_REQUEST);
! 47: cp->add_attribute(cp, configuration_attribute_create_chunk(
! 48: PLV1_CONFIGURATION_ATTRIBUTE, XAUTH_USER_NAME, chunk_empty));
! 49: cp->add_attribute(cp, configuration_attribute_create_chunk(
! 50: PLV1_CONFIGURATION_ATTRIBUTE, XAUTH_USER_PASSWORD, chunk_empty));
! 51: *out = cp;
! 52: return NEED_MORE;
! 53: }
! 54:
! 55: /**
! 56: * PAM conv callback function
! 57: */
! 58: static int auth_conv(int num_msg, const struct pam_message **msg,
! 59: struct pam_response **resp, char *password)
! 60: {
! 61: struct pam_response *response;
! 62:
! 63: if (num_msg != 1)
! 64: {
! 65: return PAM_CONV_ERR;
! 66: }
! 67: response = malloc(sizeof(struct pam_response));
! 68: response->resp = strdup(password);
! 69: response->resp_retcode = 0;
! 70: *resp = response;
! 71: return PAM_SUCCESS;
! 72: }
! 73:
! 74: /**
! 75: * Authenticate a username/password using PAM
! 76: */
! 77: static bool authenticate(char *service, char *user, char *password)
! 78: {
! 79: pam_handle_t *pamh = NULL;
! 80: static struct pam_conv conv;
! 81: int ret;
! 82:
! 83: conv.conv = (void*)auth_conv;
! 84: conv.appdata_ptr = password;
! 85:
! 86: ret = pam_start(service, user, &conv, &pamh);
! 87: if (ret != PAM_SUCCESS)
! 88: {
! 89: DBG1(DBG_IKE, "XAuth pam_start for '%s' failed: %s",
! 90: user, pam_strerror(pamh, ret));
! 91: return FALSE;
! 92: }
! 93: ret = pam_authenticate(pamh, 0);
! 94: if (ret == PAM_SUCCESS)
! 95: {
! 96: ret = pam_acct_mgmt(pamh, 0);
! 97: if (ret != PAM_SUCCESS)
! 98: {
! 99: DBG1(DBG_IKE, "XAuth pam_acct_mgmt for '%s' failed: %s",
! 100: user, pam_strerror(pamh, ret));
! 101: }
! 102: }
! 103: else
! 104: {
! 105: DBG1(DBG_IKE, "XAuth pam_authenticate for '%s' failed: %s",
! 106: user, pam_strerror(pamh, ret));
! 107: }
! 108: pam_end(pamh, ret);
! 109: return ret == PAM_SUCCESS;
! 110: }
! 111:
! 112: /**
! 113: * Convert configuration attribute content to a null-terminated string
! 114: */
! 115: static void attr2string(char *buf, size_t len, chunk_t chunk)
! 116: {
! 117: if (chunk.len && chunk.len < len)
! 118: {
! 119: chunk_t sane;
! 120:
! 121: chunk_printable(chunk, &sane, '?');
! 122: snprintf(buf, len, "%.*s", (int)sane.len, sane.ptr);
! 123: chunk_clear(&sane);
! 124: }
! 125: }
! 126:
! 127: METHOD(xauth_method_t, process, status_t,
! 128: private_xauth_pam_t *this, cp_payload_t *in, cp_payload_t **out)
! 129: {
! 130: char *service, user[128] = "", pass[128] = "", *pos;
! 131: configuration_attribute_t *attr;
! 132: enumerator_t *enumerator;
! 133: chunk_t chunk;
! 134:
! 135: enumerator = in->create_attribute_enumerator(in);
! 136: while (enumerator->enumerate(enumerator, &attr))
! 137: {
! 138: switch (attr->get_type(attr))
! 139: {
! 140: case XAUTH_USER_NAME:
! 141: chunk = attr->get_chunk(attr);
! 142: /* trim to username part if email address given */
! 143: if (lib->settings->get_bool(lib->settings,
! 144: "%s.plugins.xauth-pam.trim_email",
! 145: TRUE, lib->ns))
! 146: {
! 147: pos = memchr(chunk.ptr, '@', chunk.len);
! 148: if (pos)
! 149: {
! 150: chunk.len = (u_char*)pos - chunk.ptr;
! 151: }
! 152: }
! 153: attr2string(user, sizeof(user), chunk);
! 154: break;
! 155: case XAUTH_USER_PASSWORD:
! 156: chunk = attr->get_chunk(attr);
! 157: if (chunk.len && chunk.ptr[chunk.len - 1] == 0)
! 158: { /* fix null-terminated passwords (Android etc.) */
! 159: chunk.len -= 1;
! 160: }
! 161: attr2string(pass, sizeof(pass), chunk);
! 162: break;
! 163: default:
! 164: break;
! 165: }
! 166: }
! 167: enumerator->destroy(enumerator);
! 168:
! 169: if (!user[0] || !pass[0])
! 170: {
! 171: DBG1(DBG_IKE, "peer did not respond to our XAuth request");
! 172: return FAILED;
! 173: }
! 174:
! 175: this->peer->destroy(this->peer);
! 176: this->peer = identification_create_from_string(user);
! 177:
! 178: /* Look for PAM service, with a legacy fallback for the eap-gtc plugin.
! 179: * Default to "login". */
! 180: service = lib->settings->get_str(lib->settings,
! 181: "%s.plugins.xauth-pam.pam_service",
! 182: lib->settings->get_str(lib->settings,
! 183: "%s.plugins.eap-gtc.pam_service", "login", lib->ns),
! 184: lib->ns);
! 185:
! 186: if (authenticate(service, user, pass))
! 187: {
! 188: DBG1(DBG_IKE, "PAM authentication of '%s' successful", user);
! 189: return SUCCESS;
! 190: }
! 191: return FAILED;
! 192: }
! 193:
! 194: METHOD(xauth_method_t, get_identity, identification_t*,
! 195: private_xauth_pam_t *this)
! 196: {
! 197: return this->peer;
! 198: }
! 199:
! 200: METHOD(xauth_method_t, destroy, void,
! 201: private_xauth_pam_t *this)
! 202: {
! 203: this->peer->destroy(this->peer);
! 204: free(this);
! 205: }
! 206:
! 207: /*
! 208: * Described in header.
! 209: */
! 210: xauth_pam_t *xauth_pam_create_server(identification_t *server,
! 211: identification_t *peer, char *profile)
! 212: {
! 213: private_xauth_pam_t *this;
! 214:
! 215: INIT(this,
! 216: .public = {
! 217: .xauth_method = {
! 218: .initiate = _initiate,
! 219: .process = _process,
! 220: .get_identity = _get_identity,
! 221: .destroy = _destroy,
! 222: },
! 223: },
! 224: .peer = peer->clone(peer),
! 225: );
! 226:
! 227: return &this->public;
! 228: }
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