source: libabac/abac.hh @ 5110d42

#ifndef __ABAC_HH__
#define __ABAC_HH__

#include <string>
#include <vector>

namespace ABAC {
    extern "C" {
        #include "abac.h"
    }

    static int debug=0;

    class Role;
    class Oset;

    class Constraint {
        public:
            Constraint() : m_constraint(NULL) { } // do not use: here for swig
            Constraint(abac_condition_t *constraint): 
              m_constraint(abac_condition_dup(constraint))
              { }
            Constraint(const Constraint &constraint) { 
                m_constraint =abac_condition_dup(constraint.m_constraint);
              }
            ~Constraint() { 
                if(m_constraint) abac_condition_free(m_constraint);
              }

            /* range constraint */
            Constraint(char *vartype) { m_constraint=abac_condition_create(vartype); }

            /* [integer:?I[10 .. 20] */
            /* [float:?F[0.5 .. 2.5] */
            void add_constraint_integer_max(int val) {
                abac_condition_add_range_integer_item(m_constraint,abac_max_item_type(),val);
            }
            void add_constraint_integer_min(int val) {
                abac_condition_add_range_integer_item(m_constraint,abac_min_item_type(),val);
            }
            void add_constraint_integer_target(int val) {
                abac_condition_add_range_integer_item(m_constraint,abac_target_item_type(),val);
            }
            void add_constraint_float_max(float val) {
                abac_condition_add_range_float_item(m_constraint,abac_max_item_type(),val);
            }
            void add_constraint_float_min(float val) {
                abac_condition_add_range_float_item(m_constraint,abac_min_item_type(),val);
            }
            void add_constraint_float_target(float val) {
                abac_condition_add_range_float_item(m_constraint,abac_target_item_type(),val);
            }
            /* quoted string values */
            /* [time:?T["20201101T182930"] */
            void add_constraint_time_max(char* val) {
                abac_condition_add_range_time_item(m_constraint,abac_max_item_type(),val);
            }
            void add_constraint_time_min(char* val) {
                abac_condition_add_range_time_item(m_constraint,abac_min_item_type(),val);
            }
            void add_constraint_time_target(char* val) {
                abac_condition_add_range_time_item(m_constraint,abac_target_item_type(),val);
            }
            /* [urn:?U["fileA","http://fileB"] -only listed range */
            void add_constraint_urn_target(char* val) {
                abac_condition_add_range_urn_item(m_constraint,val);
            }
            /* [string:?S["abc",'efg',"hij"] -only listed range */
            void add_constraint_string_target(char* val) {
                abac_condition_add_range_string_item(m_constraint,val);
            }
            /*[boolean:?B['true']] */
            void add_constraint_boolean_target(char* val) {
                abac_condition_add_range_boolean_item(m_constraint,val);
            }
            
            
            /* [oset:?O[{oset-constraint}] */
            /* [role:?R[{role-constraint}] */
            /* [urn:?F[keyid:$alpha_keyid].oset:documents([string:?P])] */
            /* role constraint */
            Constraint(Role *role);
            /* oset constraint */
            Constraint(Oset *oset);
            char *string() const { 
                return abac_condition_string(m_constraint);
              }
            char *typed_string() const { 
                return abac_condition_typed_string(m_constraint);
              }
            abac_condition_t *constraint()
              { return m_constraint; }
        private:
            abac_condition_t *m_constraint;
    };

    /* XXX need to track the principal [keyid:alice] so can generate
       the id_type_clause within attribute clause */
    class DataTerm {
        public:
            DataTerm() : m_term(NULL) { } // do not use: here for swig
            DataTerm(abac_term_t *term) { 
                m_term=abac_term_dup(term);
                abac_condition_t *constraint=abac_term_constraint(m_term);
                if(constraint) m_cond=new Constraint(constraint);
                  else m_cond=NULL;
              }
            DataTerm(const DataTerm &term) { 
                m_term =abac_term_dup(term.m_term);
                abac_condition_t *constraint=abac_term_constraint(m_term);
                if(constraint) m_cond=new Constraint(constraint);
                  else m_cond=NULL;
              }
            ~DataTerm() { 
                if(m_term) abac_term_free(m_term);
                if(m_cond) free(m_cond);
              }
            /* this is for named principal data term */
            DataTerm(char *sha) {
                if(debug) printf("adding a Dataterm named principal(%s)\n",sha);
                int isnamed=1;
                int type=e_TERM_PRINCIPAL;
                m_term=abac_term_named_create(type,sha);
            }
            /* can be an a variable data term or a specific value */
            DataTerm(char* typenm, char *name, Constraint *cond=NULL) {
                int type=abac_verify_term_type(typenm);
                if(debug) printf("adding a Dataterm (%s)\n",name);
                if(type==ABAC_TERM_FAIL)
                  abac_errx(1, "DataTerm, fail to create the term");
                if(cond) {
                  m_cond=cond;
                  m_term=abac_term_create(type,name,cond->constraint());
                  } else {
                      m_cond=NULL;
                      m_term=abac_term_create(type,name,NULL);
                }
              }
            char *string() const { 
                return abac_term_string(m_term);
              }
            char *typed_string() const { 
                return abac_term_typed_string(m_term);
              }
            bool is_time() const {
                return abac_term_is_time_type(m_term);
              }
            bool is_string() const {
                return abac_term_is_string_type(m_term);
              }
            bool is_urn() const {
                return abac_term_is_urn_type(m_term);
              }
            bool is_integer() const {
                return abac_term_is_integer_type(m_term);
              }
/* Add a constraint to this term. */
            int add_constraint(Constraint& cond) {
                m_cond=new Constraint(cond);
                abac_term_add_constraint(m_term, m_cond->constraint());
              }
            int type() {
                abac_term_type(m_term);
              }
            char *name() {
                return abac_term_name(m_term);
              }
            char *value() {
/* ??? value XXX */
              }
            Constraint *constraint() {
                return m_cond;
              }
            abac_term_t *term() {
                return m_term;
              }

        private:
            abac_term_t *m_term;
            Constraint *m_cond;
    };


    class Role {
        public:
            Role() : m_role(NULL) { } // do not use: here for swig
            Role(abac_aspect_t *role): m_role(abac_aspect_dup(role))
              { }
            Role(char *principal_name) : 
               m_role(abac_aspect_role_principal_create(principal_name)) 
              { }
            Role(char *principal_name, char *role_name) : 
               m_role(abac_aspect_role_create(principal_name, role_name)) 
              { }
            Role(const Role &role) { 
                m_role = abac_aspect_dup(role.m_role);
              }
            ~Role() { 
                if (m_role) abac_aspect_free(m_role);
              }
            bool is_principal() const { 
                return abac_aspect_is_principal(m_role); 
              }
            bool is_linking() const { 
                return abac_aspect_is_linking(m_role); 
              }
            char *string() const { 
                return abac_aspect_string(m_role);
              }
            char *typed_string() {
                char* string=abac_aspect_typed_string(m_role);
                return string;
              }
            char *linked_role() const { 
                return abac_aspect_linked_role_name(m_role);
              }
            char *role_name() const { 
                return abac_aspect_aspect_name(m_role);
              }
            char *principal() const { 
                return abac_aspect_principal_name(m_role);
              }
/* Add a data term to this name. */
            int add_data_term(DataTerm& d) {
                abac_aspect_add_param(m_role, d.term());
                return 1;
              }
/* Return the DataTerms bound to this name.  If the name is returned
   in a proof, these will all have values. */
            std::vector<DataTerm> get_data_terms(bool &success) {
                abac_term_t **terms, **end;
                int i;
                terms = abac_param_list_vectorize(abac_aspect_aspect_params(m_role));
                for (i = 0; terms[i] != NULL; ++i)
                    ;
                end = &terms[i];
                std::vector<DataTerm> dataterms = std::vector<DataTerm>(terms, end);
                abac_terms_free(terms);
                success=1;
                return dataterms;
              }
            int add_linking_data_term(DataTerm& d) {
                abac_aspect_add_linked_param(m_role, d.term());
                return 1;
              }
            std::vector<DataTerm> get_linked_data_terms(bool &success) {
                abac_term_t **terms, **end;
                int i;
                terms = abac_param_list_vectorize(abac_aspect_linked_role_params(m_role));
                for (i = 0; terms[i] != NULL; ++i)
                    ;
                end = &terms[i];
                std::vector<DataTerm> dataterms = std::vector<DataTerm>(terms, end);
                abac_terms_free(terms);
                success=1;
                return dataterms;
              }
            abac_aspect_t *role() {return m_role;}
        private:
            abac_aspect_t *m_role;
    };

    class Oset {
        public:
            Oset() : m_oset(NULL) { } // do not use: here for swig
            Oset(abac_aspect_t *oset): m_oset(abac_aspect_dup(oset)) 
              { }
            Oset(char *oset_name) : m_oset(abac_aspect_oset_principal_create(oset_name)) 
              { }
            Oset(char *principal_name, char *oset_name) : 
               m_oset(abac_aspect_oset_create(principal_name, oset_name)) 
              { }
            Oset(DataTerm& d) :
               m_oset(abac_aspect_oset_object_create(d.term())) 
              { }
            Oset(const Oset &oset) { 
                m_oset =abac_aspect_dup(oset.m_oset);
              }
            ~Oset() { 
                if(m_oset) abac_aspect_free(m_oset);
              }
            bool is_object() const { 
                return abac_aspect_is_object(m_oset); 
              }
            bool is_principal() const { 
                return abac_aspect_is_principal(m_oset); 
              }
            bool is_linking() const { 
                return abac_aspect_is_linking(m_oset); 
              }
            char *string() const { 
                return abac_aspect_string(m_oset);
              }
            char *typed_string() {
                char* string=abac_aspect_typed_string(m_oset);
                return string;
              }
            char *linked_role() const { 
                return abac_aspect_linked_role_name(m_oset);
              }
            char *oset_name() const { 
                return abac_aspect_aspect_name(m_oset);
              }
            char *principal() const { 
                return abac_aspect_principal_name(m_oset);
              }
            char *object() const { 
                return abac_aspect_object_name(m_oset);
              }
/* Add a data term to this name. */
            int add_data_term(DataTerm& d) {
                abac_aspect_add_param(m_oset, d.term()); 
                return 1;
              }
/* Return the DataTerms bound to this name.  If the name is returned
   in a proof, these will all have values. */
            std::vector<DataTerm> get_data_terms(bool &success) {
                abac_term_t **terms, **end;
                int i;
                terms = abac_param_list_vectorize(abac_aspect_aspect_params(m_oset));
                for (i = 0; terms[i] != NULL; ++i)
                    ;
                end = &terms[i];
                std::vector<DataTerm> dataterms = std::vector<DataTerm>(terms, end);
                abac_terms_free(terms);
                success=1;
                return dataterms;
              }
            int add_linking_data_term(DataTerm& d) {
                abac_aspect_add_linked_param(m_oset, d.term());
                return 1;
              }
            std::vector<DataTerm> get_linked_data_terms(bool &success) {
                abac_term_t **terms, **end;
                int i;
                terms = abac_param_list_vectorize(abac_aspect_linked_role_params(m_oset));
                for (i = 0; terms[i] != NULL; ++i)
                    ;
                end = &terms[i];
                std::vector<DataTerm> dataterms = std::vector<DataTerm>(terms, end);
                abac_terms_free(terms);
                success=1;
                return dataterms;
              }
            abac_aspect_t *oset() {return m_oset;}
        private:
            abac_aspect_t *m_oset;
    };


    class ID {
        public:
            ID() : m_id(NULL) { } // do not use: here for swig
            ID(abac_id_t *id): m_id(abac_id_dup(id)) 
              { }
            ID(abac_id_credential_t *idcred) {
                if(idcred)
                  m_id=abac_id_dup(abac_id_credential_id(idcred));
                else m_id=NULL;
              }
            ID(const ID &id) { m_id =abac_id_dup(id.m_id); }
            ~ID() { if(m_id) abac_id_free(m_id); }

/* load an ID cert from a file
Will throw an exception if the cert cannot be loaded */
            ID(char *filename) {
                m_id=abac_id_from_file(filename); 
                if(m_id==NULL)
                  abac_errx(1, "Id creation from filename failed");
              }
/* generates a new ID with the supplied CN and validity period
   - CN must be alphanumeric and begin with a letter
   - validity must be at least one second
   Will throw an exception if either of the above is violated */
            ID(char *cn, int validity) {
                int rt=abac_id_generate(&m_id, cn, validity);
                if(rt != ABAC_ID_SUCCESS)  
                  abac_errx(1, "Id creation failed");
              }
/* loads the private key associated with the cert
   will throw an exception if the key cannot be loaded */
            void load_privkey(char *filename) {
                int rt=abac_id_load_privkey_file(m_id, filename);
                if(rt != 1) 
                  abac_errx(1, "Failed to load private key");
              }
            abac_id_t *id() { return m_id; }

/* returns the SHA1 keyid of the cert */
            char *keyid() { return abac_id_keyid(m_id); }
/* returns the CN */
            char *name() { return abac_id_cn(m_id); }
/* returns true if the ID has an associated private key */
            bool has_privkey() {
                return abac_id_has_privkey(m_id);
              }
/* writes a PEM-encoded cert to the file handle */
            void write_cert(FILE *out) {
                abac_id_write_cert(m_id, out); 
              }
/* writes a PEM-encoded cert to a file named out */
            void write_cert(char *filename) {
                FILE *out = fopen(filename, "a");
                write_cert(out);
                fclose(out);
              }
/* writes a PEM-encoded private key to the file handle
   throws an exception if no private key is loaded */
            void write_privkey(FILE *out) {
                if(!has_privkey())
                    abac_errx(1, "No privkey to write");
                abac_id_write_privkey(m_id, out);
              }
/* writes a PEM-encoded private key a file named out
   throws an exception if no private key is loaded */
            void write_privkey(char *filename) {
                FILE *out = fopen(filename, "a");
                write_privkey(out);
                fclose(out);
              }
/* returns a DER-encoded binary representation of the X.509 ID cert
   associated with this ID.
   can be passed to libabac's Context::load_id_chunk() */
            abac_chunk_t cert_chunk() {
                return abac_id_cert_chunk(m_id);
              }
            char *string() {
                char *tmp=NULL;
                if(has_privkey())
                  asprintf(&tmp,"(%s,%s,y)",abac_id_name(m_id),abac_id_idtype_string(m_id));
                  else asprintf(&tmp,"(%s,%s,n)",abac_id_name(m_id),abac_id_idtype_string(m_id));
                return tmp;
              }
        public:
            abac_id_t *m_id;
    };


/* N.B., The way you use this class is by instantiating the object, adding
   subjects to it, and then baking it. Only once it's baked can you access the
   X.509 cert. Once it's been baked you can no longer add subjects to it. */
    class Attribute {
        public:
            Attribute() : m_attr(NULL) { } // do not use: here for swig
            Attribute(abac_attribute_t *attr): m_attr(abac_attribute_dup(attr)) 
              { }
            Attribute(abac_credential_t *cred) {
                m_attr=abac_attribute_dup(abac_credential_attribute(cred));
              }
            Attribute(const Attribute &id) { 
                m_attr =abac_attribute_dup(id.m_attr);
              }
            ~Attribute() { 
                if(m_attr) abac_attribute_free(m_attr);
              }
/* Create an object to be signed by the given issuer with the given role
   and validity period
   An exception will be thrown if:
     - the issuer has no private key
     - the Head is invalid
     - the validity period is invalid (must be >= 1 second) */
            Attribute(Role& head, int validity) {
                int rt=abac_attribute_create(&m_attr, head.role(), NULL, validity);
                if(rt!=ABAC_ATTRIBUTE_SUCCESS)
                    abac_errx(1, "attribute(role), unable to make an attribute");
              }
            Attribute(Oset& head, int validity) {
                int rt=abac_attribute_create(&m_attr, head.oset(), NULL, validity);
                if(rt!=ABAC_ATTRIBUTE_SUCCESS)
                    abac_errx(1, "attribute(oset), unable to make an attribute");
              }
            bool add_tail(Role& tail) {
                if(abac_attribute_add_tail(m_attr, tail.role()))
                    return 1;
                    else return 0;
              }
            bool add_tail(Oset& tail) {
                if(abac_attribute_add_tail(m_attr, tail.oset()))
                    return 1;
                    else return 0;
              }
            char *head_string() {
                abac_aspect_t *head=abac_attribute_head(m_attr);
                char *string=abac_aspect_string(head);
                return string;
              }
            char *tail_string() {
                abac_aspect_t *tail=abac_attribute_tail(m_attr);
                char *string=abac_aspect_string(tail);
                return string;
              }
            char *head_typed_string() {
                abac_aspect_t *head=abac_attribute_head(m_attr);
                char *string=abac_aspect_typed_string(head);
                return string;
              }
            char *tail_typed_string() {
                abac_aspect_t *tail=abac_attribute_tail(m_attr);
                char *string=abac_aspect_typed_string(tail);
                return string;
              }
            char *string() {
                char *head=head_string();
                char *tail=tail_string();
                if(head==NULL || tail==NULL)
                    abac_errx(1, "attribute string, head and tail can not be NULL");
                char *tmp=NULL;
                asprintf(&tmp,"%s<-%s",head,tail);
                return tmp;
              }
            char *typed_string() {
                char *head=head_typed_string();
                char *tail=tail_typed_string();
                if(head==NULL || tail==NULL)
                    abac_errx(1, "attribute string, head and tail can not be NULL");
                char *tmp=NULL;
                asprintf(&tmp,"%s<-%s",head,tail);
                return tmp;
              }
            const Role &role_head() {
                abac_aspect_t *head=abac_attribute_head(m_attr);
                static Role role=Role(head);
                return role;
              }
            const Oset &oset_head() {
                abac_aspect_t *head=abac_attribute_tail(m_attr);
                static Oset oset=Oset(head);
                return oset;
              }
            std::vector<Role> role_tails(bool &success) {
                abac_aspect_t **tails, **end;
                int i;
                tails = abac_attribute_tail_vectorized(m_attr);
                for (i = 0; tails[i] != NULL; ++i)
                    ;
                end = &tails[i];
                std::vector<Role> roles = std::vector<Role>(tails, end);
                abac_aspects_free(tails);
                success=1;
                return roles;
              }
            std::vector<Oset> oset_tails(bool &success) {
                abac_aspect_t **tails, **end;
                int i;
                tails = abac_attribute_tail_vectorized(m_attr);
                for (i = 0; tails[i] != NULL; ++i)
                    ;
                end = &tails[i];
                std::vector<Oset> osets = std::vector<Oset>(tails, end);
                success=1;
                abac_aspects_free(tails);
                return osets;
              }
            abac_attribute_t *attribute() { return m_attr; }

/* Generate the cert. Call this after you've added subjects to your cert.
   This returns false if there are no subjects
   This will throw an exception if the cert's already been baked. */
            bool bake() {
                /* can not bake in ABAC_CN mode */
                if(USE("ABAC_CN"))
                    abac_errx(1, "bake, can not bake the cert with env(ABAC_CN) set");
                int rt=abac_attribute_bake(m_attr);
                if(rt!=1)
                    abac_errx(1, "bake, can not bake the cert");
              }
/* Returns true iff the cert has been baked. */
            bool baked() {
                return abac_attribute_baked(m_attr);
              }
/* Write the DER-encoded X.509 attribute cert to the open file handle
   Throws an exception if the cert isn't baked */
            void write_cert(FILE *out) {
                int rt= abac_attribute_write(m_attr,out);
                if(!rt)
                    abac_errx(1, "write, cert is not baked");
              }
/* Write the DER-encoded X.509 attribute cert to a file named out
   Throws an exception if the cert isn't baked */
            void write_cert(char *filename) {
                FILE *out = fopen(filename, "w");
                printf("writing to %s\n", filename);
                write_cert(out);
                printf("done writing to %s\n", filename);
                fclose(out);
              }
/* returns a DER-encoded binary representation of the X.509 attribute
   cert associated with this cert
   Throws an exception if the cert isn't baked
   the chunk can be passed to libabac's Context::load_attribute_chunk() */
            abac_chunk_t cert_chunk() {
                return abac_attribute_cert_chunk(m_attr);
              }
/* generate yap clauses and injected into db */
            int consume() {
              /* attribute needs to be baked */  
                if(!baked()) {
                    return ABAC_ATTRIBUTE_FAIL;
                }
              }
      private:
            abac_attribute_t *m_attr;
     };


    class Context {
        public:
            Context() { m_ctx = abac_context_new(); m_abac_version=strdup("1.0"); }
            Context(const Context &context) { 
                m_ctx = abac_context_dup(context.m_ctx);
                m_abac_version=strdup(context.m_abac_version);
              }
            ~Context() { 
                abac_context_free(m_ctx);
                if(m_abac_version) free(m_abac_version);
              }

/* load an identity certificate, returns:
      ABAC_CERT_SUCCESS   successfully loaded
      ABAC_CERT_INVALID   invalid certificate (or file not found)
      ABAC_CERT_BAD_SIG   invalid signature */
            void dump_yap() {
                show_yap_db("dump_yap");
              }
            int load_id(ABAC::ID& id) {
                return abac_context_load_id_id(m_ctx, id.id());
              }
            int load_id_file(char *filename) {
                return abac_context_load_id_idkey_file(m_ctx, filename);
              }
            int load_id_file(char *filename, char *keyfilename) {
                return abac_context_load_id_id_file_key_file(m_ctx, filename, keyfilename);
              }
            int load_id_chunk(abac_chunk_t cert) { 
                return abac_context_load_id_chunk(m_ctx, cert);
              }
/* load an attribute certificate, returns the same values as above
   * additionally can return ABAC_CERT_MISSING_ISSUER if the issuer
   certificate has not been loaded */
            int load_attribute(ABAC::Attribute& a) {
                return abac_context_load_attribute_attribute(m_ctx, a.attribute());
              }
            int load_attribute_file(char *filename) { 
                return abac_context_load_attribute_file(m_ctx, filename);
              }
            int load_attribute_chunk(abac_chunk_t cert) {
                return abac_context_load_attribute_chunk(m_ctx, cert);
              }
/* load a directory full of certificates:
   first: ${path}/*_ID.{der,pem} as identity certificates
   then: ${path}/*_attr.der as attribute certificates */
            void load_directory(char *path) {
                abac_context_load_directory(m_ctx, path);
              }
/* run the query:
       role <-?- principal
   returns true/false in success
   returns a proof upon success, partial proof on failure */
/* the string version is for query that is composed by hand with SHA or
   in non ABAC_CN mode  */
            std::vector<Attribute> query(char *role, char *principal, bool &success) {
                 abac_credential_t **creds, **end;
                 int i, success_int;

                 creds = abac_context_query(m_ctx, role, principal, &success_int);
                 success = success_int;

                 for (i = 0; creds[i] != NULL; ++i)
                    ;

                 end = &creds[i];
                 std::vector<Attribute> attributes = std::vector<Attribute>(creds, end);
                 if(debug) printf("query, got rules(%d)\n", i);

                 abac_context_credentials_free(creds);

                 return attributes;
              }

/* another way */
            std::vector<Attribute> query(Role &role, Role &p_role, bool &success) {
                 abac_credential_t **creds, **end;
                 int i, success_int;

                 /* make sure retrieving SHA not CN embedded string */
                 ABAC_IN_QUERY=1;
                 char *role_str=role.typed_string();
                 char *p_role_str=p_role.typed_string();
                 ABAC_IN_QUERY=0;
                 if(debug) { 
                     printf("query with %s\n",role_str);
                     printf("    and %s\n",p_role_str);
                 }
                 creds = abac_context_query(m_ctx, role_str, p_role_str, &success_int);
                 success = success_int;

                 for (i = 0; creds[i] != NULL; ++i)
                    ;

                 end = &creds[i];
                 std::vector<Attribute> attributes = std::vector<Attribute>(creds, end);

                 abac_context_credentials_free(creds);
                 free(role_str);
                 free(p_role_str);

                 return attributes;
              }

            std::vector<Attribute> query(Oset &oset, Oset &p_oset, bool &success) {
                 abac_credential_t **creds, **end;
                 int i, success_int;
                 /* make sure retrieving SHA not CN embedded string */
              
                 ABAC_IN_QUERY++;
                 char *oset_str=oset.typed_string();
                 char *p_oset_str=p_oset.typed_string();
                 ABAC_IN_QUERY--;

                 creds = abac_context_query(m_ctx, oset_str, p_oset_str, &success_int);
                 success = success_int;

                 for (i = 0; creds[i] != NULL; ++i)
                    ;

                 end = &creds[i];
                 std::vector<Attribute> attributes = std::vector<Attribute>(creds, end);
                 if(debug) printf("query, returning rules(%d)\n", i);

                 abac_context_credentials_free(creds);
                 free(oset_str);
                 free(p_oset_str);

                 return attributes;
              }

/* returns a vector of all the credentials loaded in the context */
            std::vector<Attribute> context_credentials(bool &success) {
                abac_credential_t **creds, **end;
                int i;
                success = 1;

                creds = abac_context_credentials(m_ctx);
                for (i = 0; creds[i] != NULL; ++i)
                    ;

                end = &creds[i];
                std::vector<Attribute> attributes = std::vector<Attribute>(creds, end);
                if(debug) printf("credentials, got (%d)\n", i);

                abac_context_credentials_free(creds);
                if(debug) show_yap_db("calling from context_credentials");
                return attributes;
              }

/* returns a vector of all the principals loaded in the context */
            std::vector<ID> context_principals(bool &success) {
                abac_id_credential_t **ids, **end;
                int i;
                success = 1;

                ids = abac_context_principals(m_ctx);
                for (i = 0; ids[i] != NULL; ++i)
                    ;

                end = &ids[i];
                std::vector<ID> principals = std::vector<ID>(ids, end);
                if(debug) printf("principals, got (%d)\n", i);

                abac_context_principals_free(ids);
                return principals;
              }
            
            char *version() const { return m_abac_version; }

        private:
            abac_context_t *m_ctx;
            char *m_abac_version;
    };

    Constraint::Constraint(Role *role)
    { m_constraint=abac_condition_create_from_aspect(role->role()); }
    Constraint::Constraint(Oset *oset)
    { m_constraint=abac_condition_create_from_aspect(oset->oset()); }
}

#endif /* __ABAC_HH__ */