| 1 | /* |
| 2 | * uhttpd - Tiny single-threaded httpd - TLS helper |
| 3 | * |
| 4 | * Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org> |
| 5 | * |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | */ |
| 18 | |
| 19 | #include "uhttpd.h" |
| 20 | #include "uhttpd-tls.h" |
| 21 | #include "uhttpd-utils.h" |
| 22 | |
| 23 | #include <syslog.h> |
| 24 | #define dbg(...) syslog(LOG_INFO, __VA_ARGS__) |
| 25 | |
| 26 | SSL_CTX * uh_tls_ctx_init(void) |
| 27 | { |
| 28 | SSL_CTX *c; |
| 29 | |
| 30 | SSL_load_error_strings(); |
| 31 | SSL_library_init(); |
| 32 | |
| 33 | #if TLS_IS_OPENSSL |
| 34 | if ((c = SSL_CTX_new(SSLv23_server_method())) != NULL) |
| 35 | #else |
| 36 | if ((c = SSL_CTX_new(TLSv1_server_method())) != NULL) |
| 37 | #endif |
| 38 | SSL_CTX_set_verify(c, SSL_VERIFY_NONE, NULL); |
| 39 | |
| 40 | return c; |
| 41 | } |
| 42 | |
| 43 | int uh_tls_ctx_cert(SSL_CTX *c, const char *file) |
| 44 | { |
| 45 | int rv; |
| 46 | |
| 47 | if( (rv = SSL_CTX_use_certificate_file(c, file, SSL_FILETYPE_PEM)) < 1 ) |
| 48 | rv = SSL_CTX_use_certificate_file(c, file, SSL_FILETYPE_ASN1); |
| 49 | |
| 50 | return rv; |
| 51 | } |
| 52 | |
| 53 | int uh_tls_ctx_key(SSL_CTX *c, const char *file) |
| 54 | { |
| 55 | int rv; |
| 56 | |
| 57 | if( (rv = SSL_CTX_use_PrivateKey_file(c, file, SSL_FILETYPE_PEM)) < 1 ) |
| 58 | rv = SSL_CTX_use_PrivateKey_file(c, file, SSL_FILETYPE_ASN1); |
| 59 | |
| 60 | return rv; |
| 61 | } |
| 62 | |
| 63 | void uh_tls_ctx_free(struct listener *l) |
| 64 | { |
| 65 | SSL_CTX_free(l->tls); |
| 66 | } |
| 67 | |
| 68 | |
| 69 | int uh_tls_client_accept(struct client *c) |
| 70 | { |
| 71 | int rv, err; |
| 72 | int fd = c->fd.fd; |
| 73 | |
| 74 | if (!c->server || !c->server->tls) |
| 75 | { |
| 76 | c->tls = NULL; |
| 77 | return 1; |
| 78 | } |
| 79 | |
| 80 | if ((c->tls = SSL_new(c->server->tls))) |
| 81 | { |
| 82 | if ((rv = SSL_set_fd(c->tls, fd)) < 1) |
| 83 | { |
| 84 | SSL_free(c->tls); |
| 85 | c->tls = NULL; |
| 86 | } |
| 87 | else |
| 88 | { |
| 89 | while (true) |
| 90 | { |
| 91 | rv = SSL_accept(c->tls); |
| 92 | err = SSL_get_error(c->tls, rv); |
| 93 | |
| 94 | if ((rv != 1) && |
| 95 | (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE)) |
| 96 | { |
| 97 | if (uh_socket_wait(fd, c->server->conf->network_timeout, |
| 98 | (err == SSL_ERROR_WANT_WRITE))) |
| 99 | { |
| 100 | D("TLS: accept(%d) = retry\n", fd); |
| 101 | continue; |
| 102 | } |
| 103 | |
| 104 | D("TLS: accept(%d) = timeout\n", fd); |
| 105 | } |
| 106 | else if (rv == 1) |
| 107 | { |
| 108 | D("TLS: accept(%d) = %p\n", fd, c->tls); |
| 109 | return 1; |
| 110 | } |
| 111 | |
| 112 | #ifdef TLS_IS_OPENSSL |
| 113 | D("TLS: accept(%d) = failed: %s\n", |
| 114 | fd, ERR_error_string(ERR_get_error(), NULL)); |
| 115 | #endif |
| 116 | |
| 117 | SSL_free(c->tls); |
| 118 | c->tls = NULL; |
| 119 | break; |
| 120 | } |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | int uh_tls_client_recv(struct client *c, char *buf, int len) |
| 128 | { |
| 129 | int rv = SSL_read(c->tls, buf, len); |
| 130 | int err = SSL_get_error(c->tls, 0); |
| 131 | |
| 132 | if ((rv == -1) && (err == SSL_ERROR_WANT_READ)) |
| 133 | { |
| 134 | D("TLS: recv(%d, %d) = retry\n", c->fd.fd, len); |
| 135 | errno = EAGAIN; |
| 136 | return -1; |
| 137 | } |
| 138 | |
| 139 | D("TLS: recv(%d, %d) = %d\n", c->fd.fd, len, rv); |
| 140 | return rv; |
| 141 | } |
| 142 | |
| 143 | int uh_tls_client_send(struct client *c, const char *buf, int len) |
| 144 | { |
| 145 | int rv = SSL_write(c->tls, buf, len); |
| 146 | int err = SSL_get_error(c->tls, 0); |
| 147 | |
| 148 | if ((rv == -1) && (err == SSL_ERROR_WANT_WRITE)) |
| 149 | { |
| 150 | D("TLS: send(%d, %d) = retry\n", c->fd.fd, len); |
| 151 | errno = EAGAIN; |
| 152 | return -1; |
| 153 | } |
| 154 | |
| 155 | D("TLS: send(%d, %d) = %d\n", c->fd.fd, len, rv); |
| 156 | return rv; |
| 157 | } |
| 158 | |
| 159 | void uh_tls_client_close(struct client *c) |
| 160 | { |
| 161 | if (c->tls) |
| 162 | { |
| 163 | D("TLS: close(%d)\n", c->fd.fd); |
| 164 | |
| 165 | SSL_shutdown(c->tls); |
| 166 | SSL_free(c->tls); |
| 167 | |
| 168 | c->tls = NULL; |
| 169 | } |
| 170 | } |
| 171 | |
