400 lines
17 KiB
Plaintext
400 lines
17 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "X509_ATTRIBUTE 3ossl"
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.TH X509_ATTRIBUTE 3ossl "2024-01-30" "3.2.1" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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X509_ATTRIBUTE, X509at_get_attr,
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X509at_get_attr_count, X509at_get_attr_by_NID, X509at_get_attr_by_OBJ,
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X509at_delete_attr,
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X509at_add1_attr,
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X509at_add1_attr_by_OBJ, X509at_add1_attr_by_NID, X509at_add1_attr_by_txt,
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X509at_get0_data_by_OBJ,
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X509_ATTRIBUTE_create, X509_ATTRIBUTE_create_by_NID,
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X509_ATTRIBUTE_create_by_OBJ, X509_ATTRIBUTE_create_by_txt,
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X509_ATTRIBUTE_set1_object, X509_ATTRIBUTE_set1_data,
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X509_ATTRIBUTE_count,
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X509_ATTRIBUTE_get0_data, X509_ATTRIBUTE_get0_object, X509_ATTRIBUTE_get0_type
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\&\- X509 attribute functions
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/x509.h>
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\&
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\& typedef struct x509_attributes_st X509_ATTRIBUTE;
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\&
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\& int X509at_get_attr_count(const STACK_OF(X509_ATTRIBUTE) *x);
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\& int X509at_get_attr_by_NID(const STACK_OF(X509_ATTRIBUTE) *x, int nid,
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\& int lastpos);
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\& int X509at_get_attr_by_OBJ(const STACK_OF(X509_ATTRIBUTE) *sk,
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\& const ASN1_OBJECT *obj, int lastpos);
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\& X509_ATTRIBUTE *X509at_get_attr(const STACK_OF(X509_ATTRIBUTE) *x, int loc);
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\& X509_ATTRIBUTE *X509at_delete_attr(STACK_OF(X509_ATTRIBUTE) *x, int loc);
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\& STACK_OF(X509_ATTRIBUTE) *X509at_add1_attr(STACK_OF(X509_ATTRIBUTE) **x,
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\& X509_ATTRIBUTE *attr);
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\& STACK_OF(X509_ATTRIBUTE) *X509at_add1_attr_by_OBJ(STACK_OF(X509_ATTRIBUTE)
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\& **x, const ASN1_OBJECT *obj,
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\& int type,
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\& const unsigned char *bytes,
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\& int len);
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\& STACK_OF(X509_ATTRIBUTE) *X509at_add1_attr_by_NID(STACK_OF(X509_ATTRIBUTE)
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\& **x, int nid, int type,
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\& const unsigned char *bytes,
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\& int len);
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\& STACK_OF(X509_ATTRIBUTE) *X509at_add1_attr_by_txt(STACK_OF(X509_ATTRIBUTE)
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\& **x, const char *attrname,
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\& int type,
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\& const unsigned char *bytes,
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\& int len);
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\& void *X509at_get0_data_by_OBJ(const STACK_OF(X509_ATTRIBUTE) *x,
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\& const ASN1_OBJECT *obj, int lastpos, int type);
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\& X509_ATTRIBUTE *X509_ATTRIBUTE_create(int nid, int atrtype, void *value);
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\& X509_ATTRIBUTE *X509_ATTRIBUTE_create_by_NID(X509_ATTRIBUTE **attr, int nid,
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\& int atrtype, const void *data,
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\& int len);
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\& X509_ATTRIBUTE *X509_ATTRIBUTE_create_by_OBJ(X509_ATTRIBUTE **attr,
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\& const ASN1_OBJECT *obj,
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\& int atrtype, const void *data,
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\& int len);
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\& X509_ATTRIBUTE *X509_ATTRIBUTE_create_by_txt(X509_ATTRIBUTE **attr,
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\& const char *atrname, int type,
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\& const unsigned char *bytes,
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\& int len);
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\& int X509_ATTRIBUTE_set1_object(X509_ATTRIBUTE *attr, const ASN1_OBJECT *obj);
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\& int X509_ATTRIBUTE_set1_data(X509_ATTRIBUTE *attr, int attrtype,
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\& const void *data, int len);
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\& void *X509_ATTRIBUTE_get0_data(X509_ATTRIBUTE *attr, int idx, int atrtype,
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\& void *data);
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\& int X509_ATTRIBUTE_count(const X509_ATTRIBUTE *attr);
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\& ASN1_OBJECT *X509_ATTRIBUTE_get0_object(X509_ATTRIBUTE *attr);
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\& ASN1_TYPE *X509_ATTRIBUTE_get0_type(X509_ATTRIBUTE *attr, int idx);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fBX509_ATTRIBUTE\fR objects are used by many standards including X509, X509_REQ,
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\&\s-1PKCS12, PKCS8, PKCS7\s0 and \s-1CMS.\s0
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.PP
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The \fBX509_ATTRIBUTE\fR object is used to represent the \s-1ASN.1\s0 Attribute as defined
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in \s-1RFC 5280,\s0 i.e.
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.PP
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.Vb 3
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\& Attribute ::= SEQUENCE {
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\& type AttributeType,
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\& values SET OF AttributeValue }
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\&
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\& AttributeType ::= OBJECT IDENTIFIER
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\& AttributeValue ::= ANY \-\- DEFINED BY AttributeType
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.Ve
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.PP
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For example \s-1CMS\s0 defines the signing-time attribute as:
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.PP
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.Vb 2
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\& id\-signingTime OBJECT IDENTIFIER ::= { iso(1) member\-body(2)
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\& us(840) rsadsi(113549) pkcs(1) pkcs9(9) 5 }
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\&
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\& SigningTime ::= Time
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\&
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\& Time ::= CHOICE {
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\& utcTime UTCTime,
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\& generalizedTime GeneralizedTime }
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.Ve
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.PP
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In OpenSSL \fBAttributeType\fR maps to an \fB\s-1ASN1_OBJECT\s0\fR object
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and \fBAttributeValue\fR maps to a list of \fB\s-1ASN1_TYPE\s0\fR objects.
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.PP
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The following functions are used for \fBX509_ATTRIBUTE\fR objects.
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.PP
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\&\fIX509at_get_attr_by_OBJ()\fR finds the location of the first matching object \fIobj\fR
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in a list of attributes \fIsk\fR. The search starts at the position after \fIlastpos\fR.
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If the returned value is positive then it can be used on the next call to
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\&\fIX509at_get_attr_by_OBJ()\fR as the value of \fIlastpos\fR in order to iterate through
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the remaining attributes. \fIlastpos\fR can be set to any negative value on the
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first call, in order to start searching from the start of the list.
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.PP
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\&\fIX509at_get_attr_by_NID()\fR is similar to \fIX509at_get_attr_by_OBJ()\fR except that it
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passes the numerical identifier (\s-1NID\s0) \fInid\fR associated with the object.
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See <openssl/obj_mac.h> for a list of NID_*.
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.PP
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\&\fIX509at_get_attr()\fR returns the \fBX509_ATTRIBUTE\fR object at index \fIloc\fR in the
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list of attributes \fIx\fR. \fIloc\fR should be in the range from 0 to
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\&\fIX509at_get_attr_count()\fR \- 1.
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.PP
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\&\fIX509at_delete_attr()\fR removes the \fBX509_ATTRIBUTE\fR object at index \fIloc\fR in
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the list of attributes \fIx\fR.
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.PP
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\&\fIX509at_add1_attr()\fR pushes a copy of the passed in \fBX509_ATTRIBUTE\fR object
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to the list \fIx\fR.
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Both \fIx\fR and \fIattr\fR must be non \s-1NULL\s0 or an error will occur.
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If \fI*x\fR is \s-1NULL\s0 then a new list is created, otherwise it uses the
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passed in list. An error will occur if an existing attribute (with the same
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attribute type) already exists in the attribute list.
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.PP
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\&\fIX509at_add1_attr_by_OBJ()\fR creates a new \fBX509_ATTRIBUTE\fR using
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\&\fIX509_ATTRIBUTE_set1_object()\fR and \fIX509_ATTRIBUTE_set1_data()\fR to assign a new
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\&\fIobj\fR with type \fItype\fR and data \fIbytes\fR of length \fIlen\fR and then pushes it
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to the attribute list \fIx\fR. Both \fIx\fR and \fIattr\fR must be non \s-1NULL\s0 or an error
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will occur. If \fI*x\fR is \s-1NULL\s0 then a new attribute list is created. If \fIobj\fR
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already exists in the attribute list then an error occurs.
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.PP
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\&\fIX509at_add1_attr_by_NID()\fR is similar to \fIX509at_add1_attr_by_OBJ()\fR except that it
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passes the numerical identifier (\s-1NID\s0) \fInid\fR associated with the object.
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See <openssl/obj_mac.h> for a list of NID_*.
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.PP
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\&\fIX509at_add1_attr_by_txt()\fR is similar to \fIX509at_add1_attr_by_OBJ()\fR except that it
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passes a name \fIattrname\fR associated with the object.
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See <openssl/obj_mac.h> for a list of SN_* names.
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.PP
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\&\fIX509_ATTRIBUTE_set1_object()\fR assigns a \fB\s-1ASN1_OBJECT\s0\fR \fIobj\fR
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to the attribute \fIattr\fR. If \fIattr\fR contained an existing \fB\s-1ASN1_OBJECT\s0\fR then
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it is freed. An error occurs if either \fIattr\fR or \fIobj\fR are \s-1NULL,\s0 or if
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the passed in \fIobj\fR cannot be duplicated.
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.PP
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\&\fIX509_ATTRIBUTE_set1_data()\fR pushes a new \fB\s-1ASN1_TYPE\s0\fR object onto the \fIattr\fR
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attributes list. The new object is assigned a copy of the data in \fIdata\fR of
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size \fIlen\fR.
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If \fIattrtype\fR has flag \fI\s-1MBSTRING_FLAG\s0\fR set then a table lookup using the
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\&\fIattr\fR attributes \s-1NID\s0 is used to set an \fB\s-1ASN1_STRING\s0\fR using
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\&\fIASN1_STRING_set_by_NID()\fR, and the passed in \fIdata\fR must be in the format
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required for that object type or an error will occur.
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If \fIlen\fR is not \-1 then internally \fIASN1_STRING_type_new()\fR is
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used with the passed in \fIattrtype\fR.
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If \fIattrtype\fR is 0 the call does nothing except return 1.
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.PP
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\&\fIX509_ATTRIBUTE_create()\fR creates a new \fBX509_ATTRIBUTE\fR using the \fInid\fR
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to set the \fB\s-1ASN1_OBJECT\s0\fR \s-1OID\s0 and the \fIatrtype\fR and \fIvalue\fR to set the
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\&\fB\s-1ASN1_TYPE\s0\fR.
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.PP
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\&\fIX509_ATTRIBUTE_create_by_OBJ()\fR uses \fIX509_ATTRIBUTE_set1_object()\fR and
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\&\fIX509_ATTRIBUTE_set1_data()\fR to assign a new \fIobj\fR with type \fIatrtype\fR and
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data \fIdata\fR of length \fIlen\fR. If the passed in attribute \fIattr\fR \s-1OR \s0\fI*attr\fR is
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\&\s-1NULL\s0 then a new \fBX509_ATTRIBUTE\fR will be returned, otherwise the passed in
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\&\fBX509_ATTRIBUTE\fR is used. Note that the \s-1ASN1_OBJECT \s0\fIobj\fR is pushed onto the
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attributes existing list of objects, which could be an issue if the attributes
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<\s-1ASN1_OBJECT\s0> was different.
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.PP
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\&\fIX509_ATTRIBUTE_create_by_NID()\fR is similar to \fIX509_ATTRIBUTE_create_by_OBJ()\fR
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except that it passes the numerical identifier (\s-1NID\s0) \fInid\fR associated with the
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object. See <openssl/obj_mac.h> for a list of NID_*.
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.PP
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\&\fIX509_ATTRIBUTE_create_by_txt()\fR is similar to \fIX509_ATTRIBUTE_create_by_OBJ()\fR
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except that it passes a name \fIatrname\fR associated with the
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object. See <openssl/obj_mac.h> for a list of SN_* names.
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.PP
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\&\fIX509_ATTRIBUTE_count()\fR returns the number of \fB\s-1ASN1_TYPE\s0\fR objects in an
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attribute \fIattr\fR.
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.PP
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\&\fIX509_ATTRIBUTE_get0_type()\fR returns the \fB\s-1ASN1_TYPE\s0\fR object at index \fIidx\fR in
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the attribute list \fIattr\fR. \fIidx\fR should be in the
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range of 0 to \fIX509_ATTRIBUTE_count()\fR \- 1 or an error will occur.
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.PP
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\&\fIX509_ATTRIBUTE_get0_data()\fR returns the data of an \fB\s-1ASN1_TYPE\s0\fR object at
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index \fIidx\fR in the attribute \fIattr\fR. \fIdata\fR is unused and can be set to \s-1NULL.\s0
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An error will occur if the attribute type \fIatrtype\fR does not match the type of
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the \fB\s-1ASN1_TYPE\s0\fR object at index \fIidx\fR \s-1OR\s0 if \fIatrtype\fR is either
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\&\fBV_ASN1_BOOLEAN\fR or \fBV_ASN1_NULL\fR \s-1OR\s0 if the \fIidx\fR is not in the
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range 0 to \fIX509_ATTRIBUTE_count()\fR \- 1.
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.PP
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\&\fIX509at_get0_data_by_OBJ()\fR finds the first attribute in an attribute list \fIx\fR
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that matches the \fIobj\fR starting at index \fIlastpos\fR and returns the data
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retrieved from the found attributes first \fB\s-1ASN1_TYPE\s0\fR object. An error will
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occur if the attribute type \fItype\fR does not match the type of the \fB\s-1ASN1_TYPE\s0\fR
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object \s-1OR\s0 if \fItype\fR is either \fBV_ASN1_BOOLEAN\fR or \fBV_ASN1_NULL\fR \s-1OR\s0 the
|
|
attribute is not found.
|
|
If \fIlastpos\fR is less than \-1 then an error will occur if there are multiple
|
|
objects in the list \fIx\fR that match \fIobj\fR.
|
|
If \fIlastpos\fR is less than \-2 then an error will occur if there is more than
|
|
one \fB\s-1ASN1_TYPE\s0\fR object in the found attribute.
|
|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
\&\fIX509at_get_attr_count()\fR returns the number of attributes in the list \fIx\fR or \-1
|
|
if \fIx\fR is \s-1NULL.\s0
|
|
.PP
|
|
\&\fIX509at_get_attr_by_OBJ()\fR returns \-1 if either the list is empty \s-1OR\s0 the object
|
|
is not found, otherwise it returns the location of the object in the list.
|
|
.PP
|
|
\&\fIX509at_get_attr_by_NID()\fR is similar to \fIX509at_get_attr_by_OBJ()\fR, except that
|
|
it returns \-2 if the \fInid\fR is not known by OpenSSL.
|
|
.PP
|
|
\&\fIX509at_get_attr()\fR returns either an \fBX509_ATTRIBUTE\fR or \s-1NULL\s0 if there is a error.
|
|
.PP
|
|
\&\fIX509at_delete_attr()\fR returns either the removed \fBX509_ATTRIBUTE\fR or \s-1NULL\s0 if
|
|
there is a error.
|
|
.PP
|
|
\&\fIX509_ATTRIBUTE_count()\fR returns \-1 on error, otherwise it returns the number
|
|
of \fB\s-1ASN1_TYPE\s0\fR elements.
|
|
.PP
|
|
\&\fIX509_ATTRIBUTE_get0_type()\fR returns \s-1NULL\s0 on error, otherwise it returns a
|
|
\&\fB\s-1ASN1_TYPE\s0\fR object.
|
|
.PP
|
|
\&\fIX509_ATTRIBUTE_get0_data()\fR returns \s-1NULL\s0 if an error occurs,
|
|
otherwise it returns the data associated with an \fB\s-1ASN1_TYPE\s0\fR object.
|
|
.PP
|
|
\&\fIX509_ATTRIBUTE_set1_object()\fR and \fIX509_ATTRIBUTE_set1_data()\fR returns 1 on
|
|
success, or 0 otherwise.
|
|
.PP
|
|
\&\fIX509_ATTRIBUTE_create()\fR, \fIX509_ATTRIBUTE_create_by_OBJ()\fR,
|
|
\&\fIX509_ATTRIBUTE_create_by_NID()\fR and \fIX509_ATTRIBUTE_create_by_txt()\fR return either
|
|
a \fBX509_ATTRIBUTE\fR on success, or \s-1NULL\s0 if there is a error.
|
|
.PP
|
|
\&\fIX509at_add1_attr()\fR, \fIX509at_add1_attr_by_OBJ()\fR, \fIX509at_add1_attr_by_NID()\fR and
|
|
\&\fIX509at_add1_attr_by_txt()\fR return \s-1NULL\s0 on error, otherwise they return a list
|
|
of \fBX509_ATTRIBUTE\fR.
|
|
.PP
|
|
\&\fIX509at_get0_data_by_OBJ()\fR returns the data retrieved from the found attributes
|
|
first \fB\s-1ASN1_TYPE\s0\fR object, or \s-1NULL\s0 if an error occurs.
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fIASN1_TYPE_get\fR\|(3),
|
|
\&\fIASN1_INTEGER_get\fR\|(3),
|
|
\&\fIASN1_ENUMERATED_get\fR\|(3),
|
|
\&\fIASN1_STRING_get0_data\fR\|(3),
|
|
\&\fIASN1_STRING_length\fR\|(3),
|
|
\&\fIASN1_STRING_type\fR\|(3),
|
|
\&\fIX509_REQ_get_attr\fR\|(3),
|
|
\&\fIEVP_PKEY_get_attr\fR\|(3),
|
|
\&\fICMS_signed_get_attr\fR\|(3),
|
|
\&\fIPKCS8_pkey_get0_attrs\fR\|(3),
|
|
.SH "COPYRIGHT"
|
|
.IX Header "COPYRIGHT"
|
|
Copyright 2023\-2024 The OpenSSL Project Authors. All Rights Reserved.
|
|
.PP
|
|
Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file \s-1LICENSE\s0 in the source distribution or at
|
|
<https://www.openssl.org/source/license.html>.
|