Don Newton | 379ae25 | 2019-04-01 12:17:06 -0400 | [diff] [blame^] | 1 | //+build gssapi |
| 2 | //+build linux darwin |
| 3 | |
| 4 | #include <string.h> |
| 5 | #include <stdio.h> |
| 6 | #include "gss_wrapper.h" |
| 7 | |
| 8 | OM_uint32 gssapi_canonicalize_name( |
| 9 | OM_uint32* minor_status, |
| 10 | char *input_name, |
| 11 | gss_OID input_name_type, |
| 12 | gss_name_t *output_name |
| 13 | ) |
| 14 | { |
| 15 | OM_uint32 major_status; |
| 16 | gss_name_t imported_name = GSS_C_NO_NAME; |
| 17 | gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER; |
| 18 | |
| 19 | buffer.value = input_name; |
| 20 | buffer.length = strlen(input_name); |
| 21 | major_status = gss_import_name(minor_status, &buffer, input_name_type, &imported_name); |
| 22 | if (GSS_ERROR(major_status)) { |
| 23 | return major_status; |
| 24 | } |
| 25 | |
| 26 | major_status = gss_canonicalize_name(minor_status, imported_name, (gss_OID)gss_mech_krb5, output_name); |
| 27 | if (imported_name != GSS_C_NO_NAME) { |
| 28 | OM_uint32 ignored; |
| 29 | gss_release_name(&ignored, &imported_name); |
| 30 | } |
| 31 | |
| 32 | return major_status; |
| 33 | } |
| 34 | |
| 35 | int gssapi_error_desc( |
| 36 | OM_uint32 maj_stat, |
| 37 | OM_uint32 min_stat, |
| 38 | char **desc |
| 39 | ) |
| 40 | { |
| 41 | OM_uint32 stat = maj_stat; |
| 42 | int stat_type = GSS_C_GSS_CODE; |
| 43 | if (min_stat != 0) { |
| 44 | stat = min_stat; |
| 45 | stat_type = GSS_C_MECH_CODE; |
| 46 | } |
| 47 | |
| 48 | OM_uint32 local_maj_stat, local_min_stat; |
| 49 | OM_uint32 msg_ctx = 0; |
| 50 | gss_buffer_desc desc_buffer; |
| 51 | do |
| 52 | { |
| 53 | local_maj_stat = gss_display_status( |
| 54 | &local_min_stat, |
| 55 | stat, |
| 56 | stat_type, |
| 57 | GSS_C_NO_OID, |
| 58 | &msg_ctx, |
| 59 | &desc_buffer |
| 60 | ); |
| 61 | if (GSS_ERROR(local_maj_stat)) { |
| 62 | return GSSAPI_ERROR; |
| 63 | } |
| 64 | |
| 65 | if (*desc) { |
| 66 | free(*desc); |
| 67 | } |
| 68 | |
| 69 | *desc = malloc(desc_buffer.length+1); |
| 70 | memcpy(*desc, desc_buffer.value, desc_buffer.length+1); |
| 71 | |
| 72 | gss_release_buffer(&local_min_stat, &desc_buffer); |
| 73 | } |
| 74 | while(msg_ctx != 0); |
| 75 | |
| 76 | return GSSAPI_OK; |
| 77 | } |
| 78 | |
| 79 | int gssapi_client_init( |
| 80 | gssapi_client_state *client, |
| 81 | char* spn, |
| 82 | char* username, |
| 83 | char* password |
| 84 | ) |
| 85 | { |
| 86 | client->cred = GSS_C_NO_CREDENTIAL; |
| 87 | client->ctx = GSS_C_NO_CONTEXT; |
| 88 | |
| 89 | client->maj_stat = gssapi_canonicalize_name(&client->min_stat, spn, GSS_C_NT_HOSTBASED_SERVICE, &client->spn); |
| 90 | if (GSS_ERROR(client->maj_stat)) { |
| 91 | return GSSAPI_ERROR; |
| 92 | } |
| 93 | |
| 94 | if (username) { |
| 95 | gss_name_t name; |
| 96 | client->maj_stat = gssapi_canonicalize_name(&client->min_stat, username, GSS_C_NT_USER_NAME, &name); |
| 97 | if (GSS_ERROR(client->maj_stat)) { |
| 98 | return GSSAPI_ERROR; |
| 99 | } |
| 100 | |
| 101 | if (password) { |
| 102 | gss_buffer_desc password_buffer; |
| 103 | password_buffer.value = password; |
| 104 | password_buffer.length = strlen(password); |
| 105 | client->maj_stat = gss_acquire_cred_with_password(&client->min_stat, name, &password_buffer, GSS_C_INDEFINITE, GSS_C_NO_OID_SET, GSS_C_INITIATE, &client->cred, NULL, NULL); |
| 106 | } else { |
| 107 | client->maj_stat = gss_acquire_cred(&client->min_stat, name, GSS_C_INDEFINITE, GSS_C_NO_OID_SET, GSS_C_INITIATE, &client->cred, NULL, NULL); |
| 108 | } |
| 109 | |
| 110 | if (GSS_ERROR(client->maj_stat)) { |
| 111 | return GSSAPI_ERROR; |
| 112 | } |
| 113 | |
| 114 | OM_uint32 ignored; |
| 115 | gss_release_name(&ignored, &name); |
| 116 | } |
| 117 | |
| 118 | return GSSAPI_OK; |
| 119 | } |
| 120 | |
| 121 | int gssapi_client_username( |
| 122 | gssapi_client_state *client, |
| 123 | char** username |
| 124 | ) |
| 125 | { |
| 126 | OM_uint32 ignored; |
| 127 | gss_name_t name = GSS_C_NO_NAME; |
| 128 | |
| 129 | client->maj_stat = gss_inquire_context(&client->min_stat, client->ctx, &name, NULL, NULL, NULL, NULL, NULL, NULL); |
| 130 | if (GSS_ERROR(client->maj_stat)) { |
| 131 | return GSSAPI_ERROR; |
| 132 | } |
| 133 | |
| 134 | gss_buffer_desc name_buffer; |
| 135 | client->maj_stat = gss_display_name(&client->min_stat, name, &name_buffer, NULL); |
| 136 | if (GSS_ERROR(client->maj_stat)) { |
| 137 | gss_release_name(&ignored, &name); |
| 138 | return GSSAPI_ERROR; |
| 139 | } |
| 140 | |
| 141 | *username = malloc(name_buffer.length+1); |
| 142 | memcpy(*username, name_buffer.value, name_buffer.length+1); |
| 143 | |
| 144 | gss_release_buffer(&ignored, &name_buffer); |
| 145 | gss_release_name(&ignored, &name); |
| 146 | return GSSAPI_OK; |
| 147 | } |
| 148 | |
| 149 | int gssapi_client_negotiate( |
| 150 | gssapi_client_state *client, |
| 151 | void* input, |
| 152 | size_t input_length, |
| 153 | void** output, |
| 154 | size_t* output_length |
| 155 | ) |
| 156 | { |
| 157 | gss_buffer_desc input_buffer = GSS_C_EMPTY_BUFFER; |
| 158 | gss_buffer_desc output_buffer = GSS_C_EMPTY_BUFFER; |
| 159 | |
| 160 | if (input) { |
| 161 | input_buffer.value = input; |
| 162 | input_buffer.length = input_length; |
| 163 | } |
| 164 | |
| 165 | client->maj_stat = gss_init_sec_context( |
| 166 | &client->min_stat, |
| 167 | client->cred, |
| 168 | &client->ctx, |
| 169 | client->spn, |
| 170 | GSS_C_NO_OID, |
| 171 | GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG, |
| 172 | 0, |
| 173 | GSS_C_NO_CHANNEL_BINDINGS, |
| 174 | &input_buffer, |
| 175 | NULL, |
| 176 | &output_buffer, |
| 177 | NULL, |
| 178 | NULL |
| 179 | ); |
| 180 | |
| 181 | if (output_buffer.length) { |
| 182 | *output = malloc(output_buffer.length); |
| 183 | *output_length = output_buffer.length; |
| 184 | memcpy(*output, output_buffer.value, output_buffer.length); |
| 185 | |
| 186 | OM_uint32 ignored; |
| 187 | gss_release_buffer(&ignored, &output_buffer); |
| 188 | } |
| 189 | |
| 190 | if (GSS_ERROR(client->maj_stat)) { |
| 191 | return GSSAPI_ERROR; |
| 192 | } else if (client->maj_stat == GSS_S_CONTINUE_NEEDED) { |
| 193 | return GSSAPI_CONTINUE; |
| 194 | } |
| 195 | |
| 196 | return GSSAPI_OK; |
| 197 | } |
| 198 | |
| 199 | int gssapi_client_wrap_msg( |
| 200 | gssapi_client_state *client, |
| 201 | void* input, |
| 202 | size_t input_length, |
| 203 | void** output, |
| 204 | size_t* output_length |
| 205 | ) |
| 206 | { |
| 207 | gss_buffer_desc input_buffer = GSS_C_EMPTY_BUFFER; |
| 208 | gss_buffer_desc output_buffer = GSS_C_EMPTY_BUFFER; |
| 209 | |
| 210 | input_buffer.value = input; |
| 211 | input_buffer.length = input_length; |
| 212 | |
| 213 | client->maj_stat = gss_wrap(&client->min_stat, client->ctx, 0, GSS_C_QOP_DEFAULT, &input_buffer, NULL, &output_buffer); |
| 214 | |
| 215 | if (output_buffer.length) { |
| 216 | *output = malloc(output_buffer.length); |
| 217 | *output_length = output_buffer.length; |
| 218 | memcpy(*output, output_buffer.value, output_buffer.length); |
| 219 | |
| 220 | gss_release_buffer(&client->min_stat, &output_buffer); |
| 221 | } |
| 222 | |
| 223 | if (GSS_ERROR(client->maj_stat)) { |
| 224 | return GSSAPI_ERROR; |
| 225 | } |
| 226 | |
| 227 | return GSSAPI_OK; |
| 228 | } |
| 229 | |
| 230 | int gssapi_client_destroy( |
| 231 | gssapi_client_state *client |
| 232 | ) |
| 233 | { |
| 234 | OM_uint32 ignored; |
| 235 | if (client->ctx != GSS_C_NO_CONTEXT) { |
| 236 | gss_delete_sec_context(&ignored, &client->ctx, GSS_C_NO_BUFFER); |
| 237 | } |
| 238 | |
| 239 | if (client->spn != GSS_C_NO_NAME) { |
| 240 | gss_release_name(&ignored, &client->spn); |
| 241 | } |
| 242 | |
| 243 | if (client->cred != GSS_C_NO_CREDENTIAL) { |
| 244 | gss_release_cred(&ignored, &client->cred); |
| 245 | } |
| 246 | |
| 247 | return GSSAPI_OK; |
| 248 | } |