1 | // Copyright (c) Microsoft. All rights reserved.
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2 | // Licensed under the MIT license. See LICENSE file in the project root for full license information.
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3 |
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4 | #include <stdlib.h>
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5 | #include "umock_c/umock_c_prod.h"
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6 | #include "azure_c_shared_utility/gballoc.h"
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7 | #include "azure_c_shared_utility/sastoken.h"
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8 | #include "azure_c_shared_utility/azure_base64.h"
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9 | #include "azure_c_shared_utility/sha.h"
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10 | #include "azure_c_shared_utility/urlencode.h"
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11 | #include "azure_c_shared_utility/strings.h"
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12 | #include "azure_c_shared_utility/xlogging.h"
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13 | #include "azure_c_shared_utility/crt_abstractions.h"
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14 | #include "azure_c_shared_utility/hmacsha256.h"
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15 |
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16 | #include "azure_prov_client/internal/iothub_auth_client.h"
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17 | #include "azure_prov_client/iothub_security_factory.h"
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18 | #include "hsm_client_data.h"
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19 |
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20 | typedef struct IOTHUB_SECURITY_INFO_TAG
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21 | {
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22 | DEVICE_AUTH_TYPE cred_type;
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23 |
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24 | HSM_CLIENT_HANDLE hsm_client_handle;
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25 |
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26 | HSM_CLIENT_CREATE hsm_client_create;
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27 | HSM_CLIENT_DESTROY hsm_client_destroy;
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28 |
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29 | HSM_CLIENT_SIGN_WITH_IDENTITY hsm_client_sign_data;
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30 |
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31 | HSM_CLIENT_GET_CERTIFICATE hsm_client_get_cert;
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32 | HSM_CLIENT_GET_ALIAS_KEY hsm_client_get_alias_key;
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33 |
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34 | HSM_CLIENT_GET_TRUST_BUNDLE hsm_client_get_trust_bundle;
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35 | HSM_CLIENT_GET_SYMMETRICAL_KEY hsm_client_get_symm_key;
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36 | HSM_CLIENT_SET_SYMMETRICAL_KEY_INFO hsm_client_set_symm_key_info;
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37 |
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38 | char* sas_token;
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39 | char* x509_certificate;
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40 | char* x509_alias_key;
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41 | bool base64_encode_signature;
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42 | bool urlencode_token_scope;
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43 | } IOTHUB_SECURITY_INFO;
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44 |
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45 | #define HMAC_LENGTH 32
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46 | static const char* const SAS_TOKEN_FORMAT = "SharedAccessSignature sr=%s&sig=%s&se=%s%s%s";
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47 | static const char* const SKN_SECTION_FORMAT = "&skn=";
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48 |
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49 | static int sign_sas_data(IOTHUB_SECURITY_INFO* security_info, const char* payload, unsigned char** output, size_t* len)
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50 | {
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51 | int result;
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52 | size_t payload_len = strlen(payload);
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53 | if (security_info->cred_type == AUTH_TYPE_SAS)
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54 | {
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55 | if (security_info->hsm_client_sign_data(security_info->hsm_client_handle, (const unsigned char*)payload, strlen(payload), output, len) != 0)
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56 | {
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57 | LogError("Failed signing data");
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58 | result = MU_FAILURE;
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59 | }
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60 | else
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61 | {
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62 | result = 0;
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63 | }
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64 | }
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65 | else
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66 | {
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67 | char* symmetrical_key = security_info->hsm_client_get_symm_key(security_info->hsm_client_handle);
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68 | if (symmetrical_key == NULL)
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69 | {
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70 | LogError("Failed getting asymmetrical key");
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71 | result = MU_FAILURE;
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72 | }
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73 | else
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74 | {
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75 | BUFFER_HANDLE decoded_key;
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76 | BUFFER_HANDLE output_hash;
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77 |
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78 | if ((decoded_key = Azure_Base64_Decode(symmetrical_key)) == NULL)
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79 | {
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80 | LogError("Failed decoding symmetrical key");
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81 | result = MU_FAILURE;
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82 | }
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83 | else if ((output_hash = BUFFER_new()) == NULL)
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84 | {
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85 | LogError("Failed allocating output hash buffer");
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86 | BUFFER_delete(decoded_key);
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87 | result = MU_FAILURE;
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88 | }
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89 | else
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90 | {
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91 | if (HMACSHA256_ComputeHash(BUFFER_u_char(decoded_key), BUFFER_length(decoded_key), (const unsigned char*)payload, payload_len, output_hash) != HMACSHA256_OK)
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92 | {
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93 | LogError("Failed computing HMAC Hash");
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94 | result = MU_FAILURE;
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95 | }
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96 | else
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97 | {
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98 | *len = BUFFER_length(output_hash);
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99 | if ((*output = malloc(*len)) == NULL)
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100 | {
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101 | LogError("Failed allocating output buffer");
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102 | result = MU_FAILURE;
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103 | }
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104 | else
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105 | {
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106 | const unsigned char* output_data = BUFFER_u_char(output_hash);
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107 | memcpy(*output, output_data, *len);
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108 | result = 0;
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109 | }
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110 | }
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111 | BUFFER_delete(decoded_key);
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112 | BUFFER_delete(output_hash);
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113 | }
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114 | free(symmetrical_key);
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115 | }
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116 | }
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117 | return result;
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118 | }
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119 |
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120 | IOTHUB_SECURITY_HANDLE iothub_device_auth_create()
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121 | {
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122 | IOTHUB_SECURITY_INFO* result;
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123 |
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124 | IOTHUB_SECURITY_TYPE iothub_security_t = iothub_security_type();
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125 |
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126 | if ((result = (IOTHUB_SECURITY_INFO*)malloc(sizeof(IOTHUB_SECURITY_INFO))) == NULL)
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127 | {
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128 | /* Codes_IOTHUB_DEV_AUTH_07_001: [ if any failure is encountered iothub_device_auth_create shall return NULL. ] */
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129 | LogError("Failed allocating IOTHUB_SECURITY_INFO.");
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130 | }
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131 | else
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132 | {
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133 | memset(result, 0, sizeof(IOTHUB_SECURITY_INFO) );
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134 | #if defined(HSM_TYPE_SAS_TOKEN) || defined(HSM_AUTH_TYPE_CUSTOM)
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135 | if (iothub_security_t == IOTHUB_SECURITY_TYPE_SAS)
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136 | {
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137 | result->cred_type = AUTH_TYPE_SAS;
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138 | result->base64_encode_signature = true;
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139 | result->urlencode_token_scope = false;
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140 | const HSM_CLIENT_TPM_INTERFACE* tpm_interface = hsm_client_tpm_interface();
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141 | if ((tpm_interface == NULL) ||
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142 | ((result->hsm_client_create = tpm_interface->hsm_client_tpm_create) == NULL) ||
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143 | ((result->hsm_client_destroy = tpm_interface->hsm_client_tpm_destroy) == NULL) ||
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144 | ((result->hsm_client_sign_data = tpm_interface->hsm_client_sign_with_identity) == NULL)
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145 | )
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146 | {
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147 | /* Codes_IOTHUB_DEV_AUTH_07_034: [ if any of the iothub_security_interface function are NULL iothub_device_auth_create shall return NULL. ] */
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148 | LogError("Invalid secure device interface");
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149 | free(result);
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150 | result = NULL;
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151 | }
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152 | }
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153 | #endif
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154 | #if defined(HSM_TYPE_X509) || defined(HSM_AUTH_TYPE_CUSTOM)
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155 | if (result != NULL && iothub_security_t == IOTHUB_SECURITY_TYPE_X509)
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156 | {
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157 | result->cred_type = AUTH_TYPE_X509;
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158 | result->base64_encode_signature = true;
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159 | result->urlencode_token_scope = false;
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160 | const HSM_CLIENT_X509_INTERFACE* x509_interface = hsm_client_x509_interface();
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161 | if ((x509_interface == NULL) ||
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162 | ((result->hsm_client_create = x509_interface->hsm_client_x509_create) == NULL) ||
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163 | ((result->hsm_client_destroy = x509_interface->hsm_client_x509_destroy) == NULL) ||
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164 | ((result->hsm_client_get_cert = x509_interface->hsm_client_get_cert) == NULL) ||
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165 | ((result->hsm_client_get_alias_key = x509_interface->hsm_client_get_key) == NULL)
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166 | )
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167 | {
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168 | /* Codes_IOTHUB_DEV_AUTH_07_034: [ if any of the iothub_security_interface function are NULL iothub_device_auth_create shall return NULL. ] */
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169 | LogError("Invalid handle parameter: DEVICE_AUTH_CREATION_INFO is NULL");
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170 | free(result);
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171 | result = NULL;
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172 | }
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173 | }
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174 | #endif
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175 | #if defined(HSM_TYPE_SYMM_KEY) || defined(HSM_AUTH_TYPE_CUSTOM)
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176 | if (result != NULL && iothub_security_t == IOTHUB_SECURITY_TYPE_SYMMETRIC_KEY)
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177 | {
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178 | result->cred_type = AUTH_TYPE_SYMM_KEY;
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179 | result->base64_encode_signature = true;
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180 | result->urlencode_token_scope = false;
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181 | const HSM_CLIENT_KEY_INTERFACE* key_interface = hsm_client_key_interface();
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182 | if ((key_interface == NULL) ||
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183 | ((result->hsm_client_create = key_interface->hsm_client_key_create) == NULL) ||
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184 | ((result->hsm_client_destroy = key_interface->hsm_client_key_destroy) == NULL) ||
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185 | ((result->hsm_client_get_symm_key = key_interface->hsm_client_get_symm_key) == NULL) ||
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186 | ((result->hsm_client_set_symm_key_info = key_interface->hsm_client_set_symm_key_info) == NULL)
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187 | )
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188 | {
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189 | LogError("Invalid x509 secure device interface was specified");
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190 | free(result);
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191 | result = NULL;
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192 | }
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193 | }
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194 | #endif
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195 | #ifdef HSM_TYPE_HTTP_EDGE
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196 | if (result != NULL && iothub_security_t == IOTHUB_SECURITY_TYPE_HTTP_EDGE)
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197 | {
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198 | result->cred_type = AUTH_TYPE_SAS;
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199 | // Because HTTP_edge operates over HTTP, the server has already base64 encoded signature its returning to us.
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200 | result->base64_encode_signature = false;
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201 | result->urlencode_token_scope = true;
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202 | const HSM_CLIENT_HTTP_EDGE_INTERFACE* http_edge_interface = hsm_client_http_edge_interface();
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203 | if ((http_edge_interface == NULL) ||
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204 | ((result->hsm_client_create = http_edge_interface->hsm_client_http_edge_create) == NULL) ||
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205 | ((result->hsm_client_destroy = http_edge_interface->hsm_client_http_edge_destroy) == NULL) ||
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206 | ((result->hsm_client_sign_data = http_edge_interface->hsm_client_sign_with_identity) == NULL) ||
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207 | ((result->hsm_client_get_trust_bundle = http_edge_interface->hsm_client_get_trust_bundle) == NULL))
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208 | {
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209 | LogError("Invalid secure device interface");
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210 | free(result);
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211 | result = NULL;
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212 | }
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213 | }
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214 | #endif
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215 | if (result == NULL)
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216 | {
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217 | LogError("Error allocating result or else unsupported security type %d", iothub_security_t);
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218 | }
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219 | else if (result->hsm_client_create == NULL)
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220 | {
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221 | LogError("hsm_client_create is not a valid address");
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222 | free(result);
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223 | result = NULL;
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224 | }
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225 | else
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226 | {
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227 | /* Codes_IOTHUB_DEV_AUTH_07_025: [ iothub_device_auth_create shall call the concrete_iothub_device_auth_create function associated with the interface_desc. ] */
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228 | /* Codes_IOTHUB_DEV_AUTH_07_026: [ if concrete_iothub_device_auth_create fails iothub_device_auth_create shall return NULL. ] */
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229 | if ((result->hsm_client_handle = result->hsm_client_create()) == NULL)
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230 | {
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231 | /* Codes_IOTHUB_DEV_AUTH_07_002: [ iothub_device_auth_create shall allocate the IOTHUB_SECURITY_INFO and shall fail if the allocation fails. ]*/
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232 | LogError("failed create device auth module.");
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233 | free(result);
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234 | result = NULL;
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235 | }
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236 | else if (result->cred_type == AUTH_TYPE_SYMM_KEY && result->hsm_client_set_symm_key_info(result->hsm_client_handle, iothub_security_get_symm_registration_name(), iothub_security_get_symmetric_key()) != 0)
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237 | {
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238 | LogError("Invalid x509 secure device interface was specified");
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239 | result->hsm_client_destroy(result->hsm_client_handle);
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240 | free(result);
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241 | result = NULL;
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242 | }
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243 | }
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244 | }
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245 | /* Codes_IOTHUB_DEV_AUTH_07_003: [ If the function succeeds iothub_device_auth_create shall return a IOTHUB_SECURITY_HANDLE. ] */
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246 | return result;
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247 | }
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248 |
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249 | void iothub_device_auth_destroy(IOTHUB_SECURITY_HANDLE handle)
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250 | {
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251 | /* Codes_IOTHUB_DEV_AUTH_07_006: [ If the argument handle is NULL, iothub_device_auth_destroy shall do nothing ] */
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252 | if (handle != NULL)
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253 | {
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254 | /* Codes_IOTHUB_DEV_AUTH_07_005: [ iothub_device_auth_destroy shall call the concrete_iothub_device_auth_destroy function associated with the XDA_INTERFACE_DESCRIPTION. ] */
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255 | free(handle->x509_certificate);
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256 | free(handle->x509_alias_key);
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257 | free(handle->sas_token);
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258 | handle->hsm_client_destroy(handle->hsm_client_handle);
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259 | /* Codes_IOTHUB_DEV_AUTH_07_004: [ iothub_device_auth_destroy shall free all resources associated with the IOTHUB_SECURITY_HANDLE handle ] */
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260 | free(handle);
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261 | }
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262 | }
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263 |
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264 | DEVICE_AUTH_TYPE iothub_device_auth_get_type(IOTHUB_SECURITY_HANDLE handle)
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265 | {
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266 | DEVICE_AUTH_TYPE result;
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267 | /* Codes_IOTHUB_DEV_AUTH_07_007: [ If the argument handle is NULL, iothub_device_auth_get_auth_type shall return AUTH_TYPE_UNKNOWN. ] */
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268 | if (handle == NULL)
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269 | {
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270 | LogError("Invalid handle specified");
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271 | result = AUTH_TYPE_UNKNOWN;
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272 | }
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273 | else
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274 | {
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275 | /* Codes_IOTHUB_DEV_AUTH_07_008: [ iothub_device_auth_get_auth_type shall call concrete_iothub_device_auth_type function associated with the XDA_INTERFACE_DESCRIPTION. ] */
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276 | /* Codes_IOTHUB_DEV_AUTH_07_009: [ iothub_device_auth_get_auth_type shall return the DEVICE_AUTH_TYPE returned by the concrete_iothub_device_auth_type function. ] */
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277 | result = handle->cred_type;
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278 | }
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279 | return result;
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280 | }
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281 |
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282 | CREDENTIAL_RESULT* iothub_device_auth_generate_credentials(IOTHUB_SECURITY_HANDLE handle, const DEVICE_AUTH_CREDENTIAL_INFO* dev_auth_cred)
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283 | {
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284 | CREDENTIAL_RESULT* result;
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285 | /* Codes_IOTHUB_DEV_AUTH_07_010: [ If the argument handle or dev_auth_cred is NULL, iothub_device_auth_generate_credentials shall return a NULL value. ] */
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286 | if (handle == NULL)
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287 | {
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288 | LogError("Invalid handle parameter: handle");
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289 | result = NULL;
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290 | }
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291 | else
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292 | {
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293 | if (handle->cred_type == AUTH_TYPE_SAS || handle->cred_type == AUTH_TYPE_SYMM_KEY)
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294 | {
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295 | char expire_token[64] = { 0 };
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296 | if (handle->sas_token != NULL)
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297 | {
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298 | free(handle->sas_token);
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299 | handle->sas_token = NULL;
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300 | }
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301 | if (dev_auth_cred == NULL || dev_auth_cred->sas_info.token_scope == NULL)
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302 | {
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303 | LogError("Invalid handle parameter: dev_auth_cred");
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304 | result = NULL;
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305 | }
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306 | else if (dev_auth_cred->dev_auth_type != AUTH_TYPE_SAS && dev_auth_cred->dev_auth_type != AUTH_TYPE_SYMM_KEY)
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307 | {
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308 | LogError("Invalid handle parameter: dev_auth_cred.dev_auth_type");
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309 | result = NULL;
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310 | }
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311 | else if (size_tToString(expire_token, sizeof(expire_token), (size_t)dev_auth_cred->sas_info.expiry_seconds) != 0)
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312 | {
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313 | result = NULL;
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314 | LogError("Failure creating expire token");
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315 | }
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316 | else
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317 | {
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318 | size_t len = strlen(dev_auth_cred->sas_info.token_scope)+strlen(expire_token)+3;
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319 | char* payload = malloc(len+1);
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320 | if (payload == NULL)
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321 | {
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322 | result = NULL;
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323 | LogError("Failure allocating payload.");
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324 | }
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325 | else
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326 | {
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327 | unsigned char* data_value;
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328 | size_t data_len;
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329 |
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330 | size_t total_len = sprintf(payload, "%s\n%s", dev_auth_cred->sas_info.token_scope, expire_token);
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331 | if (total_len <= 0)
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332 | {
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333 | result = NULL;
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334 | LogError("Failure constructing hash payload.");
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335 | }
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336 | /* Codes_IOTHUB_DEV_AUTH_07_035: [ For tpm type iothub_device_auth_generate_credentials shall call the concrete_dev_auth_sign_data function to hash the data. ] */
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337 | else if (sign_sas_data(handle, payload, &data_value, &data_len) == 0)
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338 | {
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339 | STRING_HANDLE urlEncodedSignature = NULL;
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340 | STRING_HANDLE signature = NULL;
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341 | if (handle->base64_encode_signature == true)
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342 | {
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343 | signature = Azure_Base64_Encode_Bytes(data_value, data_len);
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344 | }
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345 | else
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346 | {
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347 | signature = STRING_construct((const char*)data_value);
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348 | }
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349 |
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350 | if (signature == NULL)
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351 | {
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352 | result = NULL;
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353 | LogError("Failure constructing encoding.");
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354 | }
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355 | else if ((urlEncodedSignature = URL_Encode(signature)) == NULL)
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356 | {
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357 | result = NULL;
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358 | LogError("Failure constructing url Signature.");
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359 | STRING_delete(signature);
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360 | }
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361 | else
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362 | {
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363 | const char* skn_key = "";
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364 | const char* skn_value = "";
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365 |
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366 | if ((dev_auth_cred->sas_info.key_name != NULL) && (strlen(dev_auth_cred->sas_info.key_name) > 0))
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367 | {
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368 | // If the key name is valid then add to the sas token
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369 | skn_key = SKN_SECTION_FORMAT;
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370 | skn_value = dev_auth_cred->sas_info.key_name;
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371 | }
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372 |
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373 | STRING_HANDLE sas_token_handle = NULL;
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374 |
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375 | if (handle->urlencode_token_scope == true)
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376 | {
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377 | STRING_HANDLE url_encoded = URL_EncodeString(dev_auth_cred->sas_info.token_scope);
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378 | if (url_encoded == NULL)
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379 | {
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380 | LogError("failed to url string %s", dev_auth_cred->sas_info.token_scope);
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381 | }
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382 | else
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383 | {
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384 | sas_token_handle = STRING_construct_sprintf(SAS_TOKEN_FORMAT, STRING_c_str(url_encoded), STRING_c_str(urlEncodedSignature), expire_token, skn_key, skn_value);
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385 | }
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386 |
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387 | STRING_delete(url_encoded);
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388 | }
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389 | else
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390 | {
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391 | sas_token_handle = STRING_construct_sprintf(SAS_TOKEN_FORMAT, dev_auth_cred->sas_info.token_scope, STRING_c_str(urlEncodedSignature), expire_token, skn_key, skn_value);
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392 | }
|
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393 |
|
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394 | if (sas_token_handle == NULL)
|
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395 | {
|
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396 | result = NULL;
|
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397 | LogError("Failure constructing url Signature.");
|
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398 | }
|
---|
399 | else if ((result = malloc(sizeof(CREDENTIAL_RESULT))) == NULL)
|
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400 | {
|
---|
401 | STRING_delete(sas_token_handle);
|
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402 | LogError("Failure allocating credential result.");
|
---|
403 | }
|
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404 | else
|
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405 | {
|
---|
406 | const char* temp_sas_token = STRING_c_str(sas_token_handle);
|
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407 | if (mallocAndStrcpy_s(&handle->sas_token, temp_sas_token) != 0)
|
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408 | {
|
---|
409 | free(result);
|
---|
410 | result = NULL;
|
---|
411 | LogError("Failure allocating and copying string.");
|
---|
412 | }
|
---|
413 | else
|
---|
414 | {
|
---|
415 | result->auth_cred_result.sas_result.sas_token = handle->sas_token;
|
---|
416 | }
|
---|
417 | STRING_delete(sas_token_handle);
|
---|
418 | }
|
---|
419 | STRING_delete(signature);
|
---|
420 | STRING_delete(urlEncodedSignature);
|
---|
421 | }
|
---|
422 | free(data_value);
|
---|
423 | }
|
---|
424 | else
|
---|
425 | {
|
---|
426 | result = NULL;
|
---|
427 | LogError("Failure generate hash from tpm.");
|
---|
428 | }
|
---|
429 | free(payload);
|
---|
430 | }
|
---|
431 | }
|
---|
432 | }
|
---|
433 | else
|
---|
434 | {
|
---|
435 | if (handle->x509_certificate != NULL)
|
---|
436 | {
|
---|
437 | free(handle->x509_certificate);
|
---|
438 | handle->x509_certificate = NULL;
|
---|
439 | }
|
---|
440 | if (handle->x509_alias_key != NULL)
|
---|
441 | {
|
---|
442 | free(handle->x509_alias_key);
|
---|
443 | handle->x509_alias_key = NULL;
|
---|
444 | }
|
---|
445 |
|
---|
446 | if ((result = malloc(sizeof(CREDENTIAL_RESULT))) == NULL)
|
---|
447 | {
|
---|
448 | LogError("Failure allocating credential result.");
|
---|
449 | }
|
---|
450 | else if ((handle->x509_certificate = handle->hsm_client_get_cert(handle->hsm_client_handle)) == NULL)
|
---|
451 | {
|
---|
452 | LogError("Failure allocating device credential result.");
|
---|
453 | free(result);
|
---|
454 | result = NULL;
|
---|
455 | }
|
---|
456 | else if ((handle->x509_alias_key = handle->hsm_client_get_alias_key(handle->hsm_client_handle)) == NULL)
|
---|
457 | {
|
---|
458 | LogError("Failure allocating device credential result.");
|
---|
459 | free(handle->x509_certificate);
|
---|
460 | handle->x509_certificate = NULL;
|
---|
461 | free(result);
|
---|
462 | result = NULL;
|
---|
463 | }
|
---|
464 | else
|
---|
465 | {
|
---|
466 | result->auth_cred_result.x509_result.x509_cert = handle->x509_certificate;
|
---|
467 | result->auth_cred_result.x509_result.x509_alias_key = handle->x509_alias_key;
|
---|
468 | }
|
---|
469 | }
|
---|
470 | }
|
---|
471 | return result;
|
---|
472 | }
|
---|
473 |
|
---|
474 | #ifdef USE_EDGE_MODULES
|
---|
475 | char* iothub_device_auth_get_trust_bundle(IOTHUB_SECURITY_HANDLE handle)
|
---|
476 | {
|
---|
477 | if (handle->hsm_client_get_trust_bundle == NULL)
|
---|
478 | {
|
---|
479 | LogError("This authentication type does not support getting trusted certificates");
|
---|
480 | return NULL;
|
---|
481 | }
|
---|
482 | return handle->hsm_client_get_trust_bundle(handle->hsm_client_handle);
|
---|
483 | }
|
---|
484 | #endif
|
---|