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1.\" $OpenBSD: PKCS7_add_attribute.3,v 1.3 2020/06/10 11:39:12 schwarze Exp $
2.\"
3.\" Copyright (c) 2020 Ingo Schwarze <schwarze@openbsd.org>
4.\"
5.\" Permission to use, copy, modify, and distribute this software for any
6.\" purpose with or without fee is hereby granted, provided that the above
7.\" copyright notice and this permission notice appear in all copies.
8.\"
9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16.\"
17.Dd $Mdocdate: June 10 2020 $
18.Dt PKCS7_ADD_ATTRIBUTE 3
19.Os
20.Sh NAME
21.Nm PKCS7_add_attribute ,
22.Nm PKCS7_set_attributes ,
23.Nm PKCS7_get_attribute ,
24.Nm PKCS7_add_signed_attribute ,
25.Nm PKCS7_set_signed_attributes ,
26.Nm PKCS7_get_signed_attribute ,
27.Nm PKCS7_add_attrib_content_type ,
28.Nm PKCS7_add1_attrib_digest ,
29.Nm PKCS7_add0_attrib_signing_time ,
30.Nm PKCS7_add_attrib_smimecap
31.Nd attributes of SignerInfo objects
32.Sh SYNOPSIS
33.In openssl/pkcs7.h
34.Ft int
35.Fo PKCS7_add_attribute
36.Fa "PKCS7_SIGNER_INFO *si"
37.Fa "int nid"
38.Fa "int attrtype"
39.Fa "void *value"
40.Fc
41.Ft int
42.Fo PKCS7_set_attributes
43.Fa "PKCS7_SIGNER_INFO *si"
44.Fa "STACK_OF(X509_ATTRIBUTE) *sk"
45.Fc
46.Ft ASN1_TYPE *
47.Fo PKCS7_get_attribute
48.Fa "PKCS7_SIGNER_INFO *si"
49.Fa "int nid"
50.Fc
51.Ft int
52.Fo PKCS7_add_signed_attribute
53.Fa "PKCS7_SIGNER_INFO *si"
54.Fa "int nid"
55.Fa "int attrtype"
56.Fa "void *value"
57.Fc
58.Ft int
59.Fo PKCS7_set_signed_attributes
60.Fa "PKCS7_SIGNER_INFO *si"
61.Fa "STACK_OF(X509_ATTRIBUTE) *sk"
62.Fc
63.Ft ASN1_TYPE *
64.Fo PKCS7_get_signed_attribute
65.Fa "PKCS7_SIGNER_INFO *si"
66.Fa "int nid"
67.Fc
68.Ft int
69.Fo PKCS7_add_attrib_content_type
70.Fa "PKCS7_SIGNER_INFO *si"
71.Fa "ASN1_OBJECT *coid"
72.Fc
73.Ft int
74.Fo PKCS7_add1_attrib_digest
75.Fa "PKCS7_SIGNER_INFO *si"
76.Fa "const unsigned char *md"
77.Fa "int mdlen"
78.Fc
79.Ft int
80.Fo PKCS7_add0_attrib_signing_time
81.Fa "PKCS7_SIGNER_INFO *si"
82.Fa "ASN1_TIME *t"
83.Fc
84.Ft int
85.Fo PKCS7_add_attrib_smimecap
86.Fa "PKCS7_SIGNER_INFO *si"
87.Fa "STACK_OF(X509_ALGOR) *cap"
88.Fc
89.Sh DESCRIPTION
90.Fn PKCS7_add_attribute
91appends a new attribute of type
92.Fa nid
93to the
94.Fa unauthenticatedAttributes
95list of
96.Fa si ,
97and it adds a new ASN.1 ANY object of type
98.Fa attrtype
99with the given
100.Fa value
101to the new attribute.
102Ownership of the
103.Fa value
104is transferred into the new attribute object, so the calling code
105must not
106.Xr free 3
107the
108.Fa value .
109If the list already contains an unauthenticated attribute of type
110.Fa nid
111before the call, the new attribute replaces the old one
112instead of being appended to the end of the list.
113.Pp
114.Fn PKCS7_set_attributes
115frees the
116.Fa unauthenticatedAttributes
117list of
118.Fa si
119and all the attributes contained in it and replaces it with a deep copy of
120.Fa sk .
121.Pp
122.Fn PKCS7_get_attribute
123retrieves the first ASN.1 ANY member of the attribute of type
124.Fa nid
125from the
126.Fa unauthenticatedAttributes
127list of
128.Fa si .
129.Pp
130The behaviour of
131.Fn PKCS7_add_signed_attribute ,
132.Fn PKCS7_set_signed_attributes ,
133and
134.Fn PKCS7_get_signed_attribute
135is identical except that they operate on the list of
136.Fa authenticatedAttributes .
137.Pp
138The normal way to use
139.Fn PKCS7_add_signed_attribute
140is to first create a
141.Vt SignedInfo
142object with
143.Xr PKCS7_sign 3
144using the
145.Dv PKCS7_PARTIAL
146or
147.Dv PKCS7_STREAM
148flag, retrieve the
149.Vt PKCS7_SIGNER_INFO
150object with
151.Xr PKCS7_get_signer_info 3
152or add an additional one with
153.Xr PKCS7_sign_add_signer 3 ,
154call
155.Fn PKCS7_add_signed_attribute
156for each desired additional attribute, then do the signing with
157.Xr PKCS7_final 3
158or with another finalizing function.
159.Pp
160The four remaining functions are wrappers around
161.Fn PKCS7_add_signed_attribute .
162.Pp
163.Fn PKCS7_add_attrib_content_type
164sets the
165.Dv NID_pkcs9_contentType
166attribute to
167.Fa coid ,
168which specifies the content type of the
169.Vt ContentInfo
170value to be signed.
171This attribute is mandatory and automatically added by
172.Xr PKCS7_sign 3
173and
174.Xr PKCS7_sign_add_signer 3
175unless the
176.Dv PKCS7_NOATTR
177flag is present.
178Objects suitable as
179.Fa coid
180arguments can for example be obtained with
181.Xr OBJ_nid2obj 3 .
182If
183.Fa coid
184is
185.Dv NULL ,
186the content type defaults to
187.Dv NID_pkcs7_data .
188.Pp
189.Fn PKCS7_add1_attrib_digest
190sets or replaces the
191.Dv NID_pkcs9_messageDigest
192attribute, which is the message digest of the contents octets
193of the DER-encoding of the content field of the
194.Vt ContentInfo
195value being signed, to a copy of
196.Fa md ,
197which is assumed to be
198.Fa mdlen
199bytes long.
200If
201.Fa mdlen
202is -1, then
203.Fn strlen md
204is used instead of
205.Fa mdlen .
206This attribute is mandatory and automatically added by
207.Xr PKCS7_dataFinal 3
208and
209.Xr PKCS7_final 3 .
210.Pp
211.Fn PKCS7_add0_attrib_signing_time
212sets or replaces the optional
213.Dv NID_pkcs9_signingTime
214attribute to
215.Fa t ,
216specifying the time at which the signer performed the signing process.
217Ownership of
218.Fa t
219is transferred into the new attribute object, so the calling code
220must not
221.Xr free 3
222.Fa t .
223If
224.Fa t
225is
226.Dv NULL ,
227a new
228.Vt ASN1_TIME
229structure is allocated.
230This attribute is automatically added by
231.Xr PKCS7_dataFinal 3
232and
233.Xr PKCS7_final 3 .
234.Pp
235.Fn PKCS7_add_attrib_smimecap
236sets or replaces the optional
237.Dv NID_SMIMECapabilities
238attribute, indicating algorithms the sender is prepared to handle.
239The
240.Fa cap
241pointer is not stored in the new attribute object and can be passed to
242.Fn sk_X509_ALGOR_pop_free
243after the call.
244This attribute is automatically added by
245.Xr PKCS7_sign 3
246and
247.Xr PKCS7_sign_add_signer 3
248unless the
249.Dv PKCS7_NOATTR
250or
251.Dv PKCS7_NOSMIMECAP
252flag is present.
253.Sh RETURN VALUES
254.Fn PKCS7_add_attribute ,
255.Fn PKCS7_set_attributes ,
256.Fn PKCS7_add_signed_attribute ,
257.Fn PKCS7_set_signed_attributes ,
258.Fn PKCS7_add_attrib_content_type ,
259.Fn PKCS7_add1_attrib_digest ,
260.Fn PKCS7_add0_attrib_signing_time ,
261and
262.Fn PKCS7_add_attrib_smimecap
263return 1 on success or 0 on failure.
264The most common reason for failure is lack of memory.
265.Fn PKCS7_add_attribute
266and
267.Fn PKCS7_add_signed_attribute
268also fail if
269.Fa nid
270is invalid, and
271.Fn PKCS7_add_attrib_content_type
272if
273.Fa si
274already contains an authenticated attribute of type
275.Dv NID_pkcs9_contentType .
276.Pp
277.Fn PKCS7_get_attribute
278and
279.Fn PKCS7_get_signed_attribute
280return an internal pointer to an ASN.1 ANY object or
281.Dv NULL
282on failure.
283They fail if
284.Fa nid
285is invalid, if the respective list in
286.Fa si
287contains no attribute of the requested type, or if an invalid element
288is found in the list before finding the attribute of the requested type.
289.Sh SEE ALSO
290.Xr ASN1_TIME_new 3 ,
291.Xr ASN1_TYPE_new 3 ,
292.Xr OBJ_nid2obj 3 ,
293.Xr PKCS7_final 3 ,
294.Xr PKCS7_get_signer_info 3 ,
295.Xr PKCS7_new 3 ,
296.Xr PKCS7_sign 3 ,
297.Xr PKCS7_sign_add_signer 3 ,
298.Xr STACK_OF 3 ,
299.Xr X509_ALGOR_new 3 ,
300.Xr X509_ATTRIBUTE_new 3
301.Sh STANDARDS
302RFC 2315: PKCS #7: Cryptographic Message Syntax Version 1.5,
303section 9.2: SignerInfo type
304.Pp
305RFC 2985: PKCS #9: Selected Object Classes and Attribute Types Version 2.0,
306section 5.3: Attribute types for use in PKCS #7 data
307and section 5.6: Attributes defined in S/MIME
308.Pp
309RFC 8551: Secure/Multipurpose Internet Mail Extensions (S/MIME)
310Version 4.0 Message Specification,
311section 2.5.2: SMIMECapabilities Attribute
312.Sh HISTORY
313.Fn PKCS7_add_attribute ,
314.Fn PKCS7_set_attributes ,
315.Fn PKCS7_get_attribute ,
316.Fn PKCS7_add_signed_attribute ,
317.Fn PKCS7_set_signed_attributes ,
318and
319.Fn PKCS7_get_signed_attribute
320first appeared in OpenSSL 0.9.1 and have been available since
321.Ox 2.6 .
322.Pp
323.Fn PKCS7_add_attrib_smimecap
324first appeared in OpenSSL 0.9.5 and has been available since
325.Ox 2.7 .
326.Pp
327.Fn PKCS7_add_attrib_content_type ,
328.Fn PKCS7_add1_attrib_digest ,
329and
330.Fn PKCS7_add0_attrib_signing_time
331first appeared in OpenSSL 1.0.0 and have been available since
332.Ox 4.9 .
333.Sh CAVEATS
334.Fn PKCS7_set_signed_attributes
335does not validate that
336.Fa sk
337contains the PKCS #9 content type and message digest attributes
338required by RFC 2315.
339It succeeds even when
340.Fa sk
341is empty, leaving
342.Fa si
343in a state that violates the standard.
344.Pp
345.Fn PKCS7_add0_attrib_signing_time
346does not validate
347.Fa t
348in any way.
349In particular, it may set the signing time to the future
350or to the remote past.
351.Sh BUGS
352A function to remove individual attributes from these lists
353does not appear to exist.
354A program desiring to do that might have to manually iterate the fields
355.Fa auth_attr
356and
357.Fa unauth_attr
358of
359.Fa si ,
360which are both of type
361.Vt STACK_OF(X509_ATTRIBUTE) ,
362using the facilities described in
363.Xr STACK_OF 3
364and
365.Xr OPENSSL_sk_new 3 .
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-23 16:48:56 +0000