Mercurial > hg > nginx-quic
annotate src/event/quic/ngx_event_quic_tokens.c @ 8415:b4e6b7049984 quic
QUIC: normalize header inclusion.
Stop including QUIC headers with no user-serviceable parts inside.
This allows to provide a much cleaner QUIC interface. To cope with that,
ngx_quic_derive_key() is now explicitly exported for v3 and quic modules.
Additionally, this completely hides the ngx_quic_keys_t internal type.
author | Sergey Kandaurov <pluknet@nginx.com> |
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date | Tue, 13 Apr 2021 12:38:34 +0300 |
parents | e19723c40d28 |
children | 4117aa7fa38e |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Nginx, Inc. |
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4 */ |
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5 |
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6 |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 #include <ngx_event.h> |
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10 #include <ngx_sha1.h> |
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11 #include <ngx_event_quic_connection.h> |
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12 |
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13 |
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14 #define NGX_QUIC_MAX_TOKEN_SIZE 64 |
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15 /* SHA-1(addr)=20 + sizeof(time_t) + retry(1) + odcid.len(1) + odcid */ |
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16 |
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17 |
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18 static void ngx_quic_address_hash(ngx_connection_t *c, ngx_uint_t no_port, |
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19 u_char buf[20]); |
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20 |
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21 |
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22 ngx_int_t |
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23 ngx_quic_new_sr_token(ngx_connection_t *c, ngx_str_t *cid, u_char *secret, |
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24 u_char *token) |
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25 { |
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26 ngx_str_t tmp; |
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27 |
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28 tmp.data = secret; |
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29 tmp.len = NGX_QUIC_SR_KEY_LEN; |
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30 |
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31 if (ngx_quic_derive_key(c->log, "sr_token_key", &tmp, cid, token, |
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32 NGX_QUIC_SR_TOKEN_LEN) |
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33 != NGX_OK) |
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34 { |
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35 return NGX_ERROR; |
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36 } |
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37 |
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38 #if (NGX_DEBUG) |
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39 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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40 "quic stateless reset token %*xs", |
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41 (size_t) NGX_QUIC_SR_TOKEN_LEN, token); |
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42 #endif |
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43 |
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44 return NGX_OK; |
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45 } |
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46 |
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47 |
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48 ngx_int_t |
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49 ngx_quic_new_token(ngx_connection_t *c, u_char *key, ngx_str_t *token, |
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50 ngx_str_t *odcid, time_t exp, ngx_uint_t is_retry) |
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51 { |
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52 int len, iv_len; |
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53 u_char *p, *iv; |
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54 EVP_CIPHER_CTX *ctx; |
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55 const EVP_CIPHER *cipher; |
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56 |
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57 u_char in[NGX_QUIC_MAX_TOKEN_SIZE]; |
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58 |
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59 ngx_quic_address_hash(c, !is_retry, in); |
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60 |
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61 p = in + 20; |
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62 |
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63 p = ngx_cpymem(p, &exp, sizeof(time_t)); |
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64 |
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65 *p++ = is_retry ? 1 : 0; |
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66 |
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67 if (odcid) { |
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68 *p++ = odcid->len; |
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69 p = ngx_cpymem(p, odcid->data, odcid->len); |
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70 |
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71 } else { |
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72 *p++ = 0; |
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73 } |
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74 |
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75 len = p - in; |
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76 |
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77 cipher = EVP_aes_256_cbc(); |
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78 iv_len = EVP_CIPHER_iv_length(cipher); |
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79 |
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80 token->len = iv_len + len + EVP_CIPHER_block_size(cipher); |
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81 token->data = ngx_pnalloc(c->pool, token->len); |
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82 if (token->data == NULL) { |
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83 return NGX_ERROR; |
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84 } |
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85 |
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86 ctx = EVP_CIPHER_CTX_new(); |
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87 if (ctx == NULL) { |
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88 return NGX_ERROR; |
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89 } |
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90 |
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91 iv = token->data; |
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92 |
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93 if (RAND_bytes(iv, iv_len) <= 0 |
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94 || !EVP_EncryptInit_ex(ctx, cipher, NULL, key, iv)) |
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95 { |
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96 EVP_CIPHER_CTX_free(ctx); |
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97 return NGX_ERROR; |
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98 } |
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99 |
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100 token->len = iv_len; |
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101 |
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102 if (EVP_EncryptUpdate(ctx, token->data + token->len, &len, in, len) != 1) { |
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103 EVP_CIPHER_CTX_free(ctx); |
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104 return NGX_ERROR; |
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105 } |
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106 |
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107 token->len += len; |
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108 |
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109 if (EVP_EncryptFinal_ex(ctx, token->data + token->len, &len) <= 0) { |
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110 EVP_CIPHER_CTX_free(ctx); |
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111 return NGX_ERROR; |
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112 } |
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113 |
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114 token->len += len; |
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115 |
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116 EVP_CIPHER_CTX_free(ctx); |
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117 |
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118 #ifdef NGX_QUIC_DEBUG_PACKETS |
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119 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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120 "quic new token len:%uz %xV", token->len, token); |
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121 #endif |
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122 |
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123 return NGX_OK; |
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124 } |
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125 |
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126 |
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127 static void |
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|
128 ngx_quic_address_hash(ngx_connection_t *c, ngx_uint_t no_port, u_char buf[20]) |
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|
129 { |
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|
130 size_t len; |
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|
131 u_char *data; |
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|
132 ngx_sha1_t sha1; |
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|
133 struct sockaddr_in *sin; |
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|
134 #if (NGX_HAVE_INET6) |
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|
135 struct sockaddr_in6 *sin6; |
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|
136 #endif |
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|
137 |
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|
138 len = (size_t) c->socklen; |
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|
139 data = (u_char *) c->sockaddr; |
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|
140 |
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parents:
diff
changeset
|
141 if (no_port) { |
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parents:
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changeset
|
142 switch (c->sockaddr->sa_family) { |
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|
143 |
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|
144 #if (NGX_HAVE_INET6) |
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|
145 case AF_INET6: |
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parents:
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|
146 sin6 = (struct sockaddr_in6 *) c->sockaddr; |
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|
147 |
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|
148 len = sizeof(struct in6_addr); |
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|
149 data = sin6->sin6_addr.s6_addr; |
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|
150 |
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|
151 break; |
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|
152 #endif |
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|
153 |
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|
154 case AF_INET: |
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|
155 sin = (struct sockaddr_in *) c->sockaddr; |
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changeset
|
156 |
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changeset
|
157 len = sizeof(in_addr_t); |
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|
158 data = (u_char *) &sin->sin_addr; |
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changeset
|
159 |
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parents:
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changeset
|
160 break; |
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parents:
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changeset
|
161 } |
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Vladimir Homutov <vl@nginx.com>
parents:
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changeset
|
162 } |
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Vladimir Homutov <vl@nginx.com>
parents:
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changeset
|
163 |
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Vladimir Homutov <vl@nginx.com>
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diff
changeset
|
164 ngx_sha1_init(&sha1); |
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changeset
|
165 ngx_sha1_update(&sha1, data, len); |
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changeset
|
166 ngx_sha1_final(buf, &sha1); |
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parents:
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changeset
|
167 } |
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parents:
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changeset
|
168 |
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parents:
diff
changeset
|
169 |
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
170 ngx_int_t |
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changeset
|
171 ngx_quic_validate_token(ngx_connection_t *c, u_char *key, |
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changeset
|
172 ngx_quic_header_t *pkt) |
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diff
changeset
|
173 { |
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changeset
|
174 int len, tlen, iv_len; |
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|
175 u_char *iv, *p; |
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changeset
|
176 time_t now, exp; |
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diff
changeset
|
177 size_t total; |
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parents:
diff
changeset
|
178 ngx_str_t odcid; |
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changeset
|
179 EVP_CIPHER_CTX *ctx; |
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changeset
|
180 const EVP_CIPHER *cipher; |
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changeset
|
181 |
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
182 u_char addr_hash[20]; |
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parents:
diff
changeset
|
183 u_char tdec[NGX_QUIC_MAX_TOKEN_SIZE]; |
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parents:
diff
changeset
|
184 |
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diff
changeset
|
185 /* Retry token or NEW_TOKEN in a previous connection */ |
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parents:
diff
changeset
|
186 |
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
187 cipher = EVP_aes_256_cbc(); |
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
188 iv = pkt->token.data; |
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
189 iv_len = EVP_CIPHER_iv_length(cipher); |
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parents:
diff
changeset
|
190 |
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
191 /* sanity checks */ |
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
192 |
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
193 if (pkt->token.len < (size_t) iv_len + EVP_CIPHER_block_size(cipher)) { |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
194 goto garbage; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
195 } |
e19723c40d28
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
196 |
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
197 if (pkt->token.len > (size_t) iv_len + NGX_QUIC_MAX_TOKEN_SIZE) { |
e19723c40d28
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
198 goto garbage; |
e19723c40d28
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
199 } |
e19723c40d28
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
200 |
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
201 ctx = EVP_CIPHER_CTX_new(); |
e19723c40d28
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
202 if (ctx == NULL) { |
e19723c40d28
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
203 return NGX_ERROR; |
e19723c40d28
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
204 } |
e19723c40d28
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
205 |
e19723c40d28
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Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
206 if (!EVP_DecryptInit_ex(ctx, cipher, NULL, key, iv)) { |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
207 EVP_CIPHER_CTX_free(ctx); |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
208 return NGX_ERROR; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
209 } |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
210 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
211 p = pkt->token.data + iv_len; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
212 len = pkt->token.len - iv_len; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
213 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
214 if (EVP_DecryptUpdate(ctx, tdec, &len, p, len) != 1) { |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
215 EVP_CIPHER_CTX_free(ctx); |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
216 goto garbage; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
217 } |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
218 total = len; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
219 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
220 if (EVP_DecryptFinal_ex(ctx, tdec + len, &tlen) <= 0) { |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
221 EVP_CIPHER_CTX_free(ctx); |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
222 goto garbage; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
223 } |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
224 total += tlen; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
225 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
226 EVP_CIPHER_CTX_free(ctx); |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
227 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
228 if (total < (20 + sizeof(time_t) + 2)) { |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
229 goto garbage; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
230 } |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
231 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
232 p = tdec + 20; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
233 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
234 ngx_memcpy(&exp, p, sizeof(time_t)); |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
235 p += sizeof(time_t); |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
236 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
237 pkt->retried = (*p++ == 1); |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
238 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
239 ngx_quic_address_hash(c, !pkt->retried, addr_hash); |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
240 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
241 if (ngx_memcmp(tdec, addr_hash, 20) != 0) { |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
242 goto bad_token; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
243 } |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
244 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
245 odcid.len = *p++; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
246 if (odcid.len) { |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
247 if (odcid.len > NGX_QUIC_MAX_CID_LEN) { |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
248 goto bad_token; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
249 } |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
250 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
251 if ((size_t)(tdec + total - p) < odcid.len) { |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
252 goto bad_token; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
253 } |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
254 |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
255 odcid.data = p; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
256 p += odcid.len; |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
257 } |
e19723c40d28
QUIC: separate files for tokens related processing.
Vladimir Homutov <vl@nginx.com>
parents:
diff
changeset
|
258 |
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259 now = ngx_time(); |
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260 |
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261 if (now > exp) { |
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262 ngx_log_error(NGX_LOG_INFO, c->log, 0, "quic expired token"); |
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263 return NGX_DECLINED; |
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264 } |
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265 |
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266 if (odcid.len) { |
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267 pkt->odcid.len = odcid.len; |
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268 pkt->odcid.data = ngx_pstrdup(c->pool, &odcid); |
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269 if (pkt->odcid.data == NULL) { |
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270 return NGX_ERROR; |
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271 } |
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272 |
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273 } else { |
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274 pkt->odcid = pkt->dcid; |
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275 } |
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276 |
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277 pkt->validated = 1; |
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278 |
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279 return NGX_OK; |
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280 |
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281 garbage: |
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282 |
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283 ngx_log_error(NGX_LOG_INFO, c->log, 0, "quic garbage token"); |
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284 |
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285 return NGX_ABORT; |
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286 |
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287 bad_token: |
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288 |
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289 ngx_log_error(NGX_LOG_INFO, c->log, 0, "quic invalid token"); |
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290 |
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291 return NGX_DECLINED; |
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292 } |