1 /**
2 * XML Security Library example: Signing a file with a dynamicaly created template.
3 *
4 * Signs a file using a dynamicaly created template and key from PEM file.
5 * The signature has one reference with one enveloped transform to sign
6 * the whole document except the <dsig:Signature/> node itself.
7 *
8 * Usage:
9 * sign2 <xml-doc> <pem-key>
10 *
11 * Example:
12 * ./sign2 sign2-doc.xml rsakey.pem > sign2-res.xml
13 *
14 * The result signature could be validated using verify1 example:
15 * ./verify1 sign2-res.xml rsapub.pem
16 *
17 * This is free software; see Copyright file in the source
18 * distribution for preciese wording.
19 *
20 * Copyright (C) 2002-2016 Aleksey Sanin <aleksey@aleksey.com>. All Rights Reserved.
21 */
22 #include <stdlib.h>
23 #include <string.h>
24 #include <assert.h>
25
26 #include <libxml/tree.h>
27 #include <libxml/xmlmemory.h>
28 #include <libxml/parser.h>
29
30 #ifndef XMLSEC_NO_XSLT
31 #include <libxslt/xslt.h>
32 #include <libxslt/security.h>
33 #endif /* XMLSEC_NO_XSLT */
34
35 #include <xmlsec/xmlsec.h>
36 #include <xmlsec/xmltree.h>
37 #include <xmlsec/xmldsig.h>
38 #include <xmlsec/templates.h>
39 #include <xmlsec/crypto.h>
40
41 int sign_file(const char* xml_file, const char* key_file);
42
43 int
main(int argc,char ** argv)44 main(int argc, char **argv) {
45 #ifndef XMLSEC_NO_XSLT
46 xsltSecurityPrefsPtr xsltSecPrefs = NULL;
47 #endif /* XMLSEC_NO_XSLT */
48
49 assert(argv);
50
51 if(argc != 3) {
52 fprintf(stderr, "Error: wrong number of arguments.\n");
53 fprintf(stderr, "Usage: %s <xml-file> <key-file>\n", argv[0]);
54 return(1);
55 }
56
57 /* Init libxml and libxslt libraries */
58 xmlInitParser();
59 LIBXML_TEST_VERSION
60 xmlLoadExtDtdDefaultValue = XML_DETECT_IDS | XML_COMPLETE_ATTRS;
61 xmlSubstituteEntitiesDefault(1);
62 #ifndef XMLSEC_NO_XSLT
63 xmlIndentTreeOutput = 1;
64 #endif /* XMLSEC_NO_XSLT */
65
66 /* Init libxslt */
67 #ifndef XMLSEC_NO_XSLT
68 /* disable everything */
69 xsltSecPrefs = xsltNewSecurityPrefs();
70 xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_READ_FILE, xsltSecurityForbid);
71 xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_WRITE_FILE, xsltSecurityForbid);
72 xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_CREATE_DIRECTORY, xsltSecurityForbid);
73 xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_READ_NETWORK, xsltSecurityForbid);
74 xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_WRITE_NETWORK, xsltSecurityForbid);
75 xsltSetDefaultSecurityPrefs(xsltSecPrefs);
76 #endif /* XMLSEC_NO_XSLT */
77
78 /* Init xmlsec library */
79 if(xmlSecInit() < 0) {
80 fprintf(stderr, "Error: xmlsec initialization failed.\n");
81 return(-1);
82 }
83
84 /* Check loaded library version */
85 if(xmlSecCheckVersion() != 1) {
86 fprintf(stderr, "Error: loaded xmlsec library version is not compatible.\n");
87 return(-1);
88 }
89
90 /* Load default crypto engine if we are supporting dynamic
91 * loading for xmlsec-crypto libraries. Use the crypto library
92 * name ("openssl", "nss", etc.) to load corresponding
93 * xmlsec-crypto library.
94 */
95 #ifdef XMLSEC_CRYPTO_DYNAMIC_LOADING
96 if(xmlSecCryptoDLLoadLibrary(NULL) < 0) {
97 fprintf(stderr, "Error: unable to load default xmlsec-crypto library. Make sure\n"
98 "that you have it installed and check shared libraries path\n"
99 "(LD_LIBRARY_PATH and/or LTDL_LIBRARY_PATH) environment variables.\n");
100 return(-1);
101 }
102 #endif /* XMLSEC_CRYPTO_DYNAMIC_LOADING */
103
104 /* Init crypto library */
105 if(xmlSecCryptoAppInit(NULL) < 0) {
106 fprintf(stderr, "Error: crypto initialization failed.\n");
107 return(-1);
108 }
109
110 /* Init xmlsec-crypto library */
111 if(xmlSecCryptoInit() < 0) {
112 fprintf(stderr, "Error: xmlsec-crypto initialization failed.\n");
113 return(-1);
114 }
115
116 if(sign_file(argv[1], argv[2]) < 0) {
117 return(-1);
118 }
119
120 /* Shutdown xmlsec-crypto library */
121 xmlSecCryptoShutdown();
122
123 /* Shutdown crypto library */
124 xmlSecCryptoAppShutdown();
125
126 /* Shutdown xmlsec library */
127 xmlSecShutdown();
128
129 /* Shutdown libxslt/libxml */
130 #ifndef XMLSEC_NO_XSLT
131 xsltFreeSecurityPrefs(xsltSecPrefs);
132 xsltCleanupGlobals();
133 #endif /* XMLSEC_NO_XSLT */
134 xmlCleanupParser();
135
136 return(0);
137 }
138
139 /**
140 * sign_file:
141 * @xml_file: the XML file name.
142 * @key_file: the PEM private key file name.
143 *
144 * Signs the #xml_file using private key from #key_file and dynamicaly
145 * created enveloped signature template.
146 *
147 * Returns 0 on success or a negative value if an error occurs.
148 */
149 int
sign_file(const char * xml_file,const char * key_file)150 sign_file(const char* xml_file, const char* key_file) {
151 xmlDocPtr doc = NULL;
152 xmlNodePtr signNode = NULL;
153 xmlNodePtr refNode = NULL;
154 xmlNodePtr keyInfoNode = NULL;
155 xmlSecDSigCtxPtr dsigCtx = NULL;
156 int res = -1;
157
158 assert(xml_file);
159 assert(key_file);
160
161 /* load doc file */
162 doc = xmlParseFile(xml_file);
163 if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
164 fprintf(stderr, "Error: unable to parse file \"%s\"\n", xml_file);
165 goto done;
166 }
167
168 /* create signature template for RSA-SHA1 enveloped signature */
169 signNode = xmlSecTmplSignatureCreate(doc, xmlSecTransformExclC14NId,
170 xmlSecTransformRsaSha1Id, NULL);
171 if(signNode == NULL) {
172 fprintf(stderr, "Error: failed to create signature template\n");
173 goto done;
174 }
175
176 /* add <dsig:Signature/> node to the doc */
177 xmlAddChild(xmlDocGetRootElement(doc), signNode);
178
179 /* add reference */
180 refNode = xmlSecTmplSignatureAddReference(signNode, xmlSecTransformSha1Id,
181 NULL, NULL, NULL);
182 if(refNode == NULL) {
183 fprintf(stderr, "Error: failed to add reference to signature template\n");
184 goto done;
185 }
186
187 /* add enveloped transform */
188 if(xmlSecTmplReferenceAddTransform(refNode, xmlSecTransformEnvelopedId) == NULL) {
189 fprintf(stderr, "Error: failed to add enveloped transform to reference\n");
190 goto done;
191 }
192
193 /* add <dsig:KeyInfo/> and <dsig:KeyName/> nodes to put key name in the signed document */
194 keyInfoNode = xmlSecTmplSignatureEnsureKeyInfo(signNode, NULL);
195 if(keyInfoNode == NULL) {
196 fprintf(stderr, "Error: failed to add key info\n");
197 goto done;
198 }
199
200 if(xmlSecTmplKeyInfoAddKeyName(keyInfoNode, NULL) == NULL) {
201 fprintf(stderr, "Error: failed to add key name\n");
202 goto done;
203 }
204
205 /* create signature context, we don't need keys manager in this example */
206 dsigCtx = xmlSecDSigCtxCreate(NULL);
207 if(dsigCtx == NULL) {
208 fprintf(stderr,"Error: failed to create signature context\n");
209 goto done;
210 }
211
212 /* load private key, assuming that there is not password */
213 dsigCtx->signKey = xmlSecCryptoAppKeyLoad(key_file, xmlSecKeyDataFormatPem, NULL, NULL, NULL);
214 if(dsigCtx->signKey == NULL) {
215 fprintf(stderr,"Error: failed to load private pem key from \"%s\"\n", key_file);
216 goto done;
217 }
218
219 /* set key name to the file name, this is just an example! */
220 if(xmlSecKeySetName(dsigCtx->signKey, key_file) < 0) {
221 fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", key_file);
222 goto done;
223 }
224
225 /* sign the template */
226 if(xmlSecDSigCtxSign(dsigCtx, signNode) < 0) {
227 fprintf(stderr,"Error: signature failed\n");
228 goto done;
229 }
230
231 /* print signed document to stdout */
232 xmlDocDump(stdout, doc);
233
234 /* success */
235 res = 0;
236
237 done:
238 /* cleanup */
239 if(dsigCtx != NULL) {
240 xmlSecDSigCtxDestroy(dsigCtx);
241 }
242
243 if(doc != NULL) {
244 xmlFreeDoc(doc);
245 }
246 return(res);
247 }
248
249