[31b67d5] | 1 | package net.deterlab.abac; |
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| 2 | |
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[de63a31] | 3 | import java.util.*; |
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| 4 | |
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[281158a] | 5 | import org.bouncycastle.asn1.*; |
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| 6 | |
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[31b67d5] | 7 | /** |
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| 8 | * Represents a role, which is a vertex in a Credential graph. |
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| 9 | */ |
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[88e139a] | 10 | public class Role implements Comparable { |
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[d69593c] | 11 | protected String m_string; |
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| 12 | protected String[] m_parts; |
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| 13 | protected String m_A_r1; |
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| 14 | protected String m_r2; |
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| 15 | protected String m_prefix; |
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| 16 | protected Role[] m_prereqs; |
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[31b67d5] | 17 | |
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| 18 | /** |
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[cac4c76] | 19 | * Create a role from a string. A single role must be of the format "A", |
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[31b67d5] | 20 | * "A.r1", or "A.r1.r2", where A is a principal and r1 and r2 are role |
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[cac4c76] | 21 | * names. This constructor also supports intersection roles: a sequence of |
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[bcf7370] | 22 | * two or more roles separated by "&". The whitespace surrounding & |
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| 23 | * is arbitrary. |
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[cac4c76] | 24 | * |
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| 25 | * If the string does not have this format, the constructor throws a |
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| 26 | * RuntimeException. |
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[31b67d5] | 27 | */ |
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| 28 | public Role(String s) throws RuntimeException { |
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| 29 | m_string = s; |
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| 30 | |
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[bcf7370] | 31 | // intersection roles have at least two roles separated by "&" |
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| 32 | String[] isect_roles = s.split("&"); |
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[cac4c76] | 33 | |
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| 34 | // ordinary role |
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| 35 | if (isect_roles.length == 1) |
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| 36 | single_role(); |
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| 37 | |
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| 38 | // intersection role: make a list of prereqs |
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| 39 | else { |
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| 40 | m_prereqs = new Role[isect_roles.length]; |
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[53f5c27] | 41 | |
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| 42 | // trim() handles arbitrary whitespace |
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[cac4c76] | 43 | for (int i = 0; i < isect_roles.length; ++i) |
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[53f5c27] | 44 | m_prereqs[i] = new Role(isect_roles[i].trim()); |
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[cac4c76] | 45 | |
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| 46 | // this make is_principal etc. work properly |
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| 47 | m_parts = new String[0]; |
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| 48 | } |
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| 49 | } |
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| 50 | |
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[84f0e7a] | 51 | public Role(String s, Context c) { |
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| 52 | this(c.expandKeyID(s)); |
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[de63a31] | 53 | } |
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| 54 | |
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[d69593c] | 55 | public Role(Role r) { |
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| 56 | m_string = r.m_string; |
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| 57 | m_A_r1 = r.m_A_r1; |
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| 58 | m_r2 = r.m_r2; |
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| 59 | m_prefix = r.m_prefix; |
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| 60 | m_parts = new String[r.m_parts.length]; |
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| 61 | for (int i = 0; i < r.m_parts.length; i++) |
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| 62 | m_parts[i] = r.m_parts[i]; |
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| 63 | m_prereqs = new Role[m_prereqs.length]; |
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| 64 | for (int i = 0; i < r.m_prereqs.length; i++) |
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| 65 | m_prereqs[i] = new Role(r.m_prereqs[i]); |
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| 66 | } |
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| 67 | |
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[cac4c76] | 68 | /** |
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| 69 | * Initialize a single non-intersection role. See constructor for details of |
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| 70 | * role format. Will throw RuntimeException if the role is invalid. |
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| 71 | */ |
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| 72 | private void single_role() throws RuntimeException { |
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| 73 | m_parts = m_string.split("\\."); |
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[31b67d5] | 74 | if (m_parts.length > 3) |
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| 75 | throw new RuntimeException("Not a valid role: " + m_string); |
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| 76 | |
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| 77 | // linking role: prefix is A.r1 from A.r1.r2 |
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| 78 | if (is_linking()) { |
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| 79 | m_A_r1 = m_parts[0] + "." + m_parts[1]; |
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| 80 | m_r2 = m_parts[2]; |
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| 81 | m_prefix = m_A_r1; |
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| 82 | } |
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| 83 | |
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| 84 | // role: prefix is A from A.r1 |
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| 85 | else if (is_role()) |
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| 86 | m_prefix = m_parts[0]; |
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| 87 | |
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| 88 | // principal: prefix is the whole thing |
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| 89 | else |
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| 90 | m_prefix = m_string; |
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| 91 | } |
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| 92 | |
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| 93 | /** |
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| 94 | * Returns true iff the role is a principal. |
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| 95 | */ |
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| 96 | public boolean is_principal() { return m_parts.length == 1; } |
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| 97 | |
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| 98 | /** |
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| 99 | * Returns true iff the role is a role (i.e., A.r1). |
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| 100 | */ |
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| 101 | public boolean is_role() { return m_parts.length == 2; } |
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| 102 | |
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| 103 | /** |
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| 104 | * Returns true iff the role is a linking role (i.e., A.r1.r2). |
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| 105 | */ |
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| 106 | public boolean is_linking() { return m_parts.length == 3; } |
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| 107 | |
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[cac4c76] | 108 | /** |
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| 109 | * Returns true iff the role represents an intersection role. |
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| 110 | */ |
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| 111 | public boolean is_intersection() { return m_prereqs != null; } |
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| 112 | |
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[31b67d5] | 113 | /** |
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| 114 | * Returns the first two elements of a linking role's name. This typically |
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| 115 | * refers to another role in the graph. This will throw a runtime |
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| 116 | * exception if the node is not a linking role. |
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| 117 | */ |
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[5129e3e] | 118 | String A_r1() throws RuntimeException { |
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[31b67d5] | 119 | if (!is_linking()) |
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| 120 | throw new RuntimeException("Not a linking role"); |
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| 121 | return m_A_r1; |
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| 122 | } |
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| 123 | |
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| 124 | /** |
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| 125 | * Return the last element of a linking role's name. This will throw a |
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| 126 | * runtime exception if the node is not a linking role. |
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| 127 | */ |
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[5129e3e] | 128 | String r2() throws RuntimeException { |
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[31b67d5] | 129 | if (!is_linking()) |
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| 130 | throw new RuntimeException("Not a linking role"); |
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| 131 | return m_r2; |
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| 132 | } |
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| 133 | |
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| 134 | /** |
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| 135 | * Returns the principal part of a role or principal. This is everything |
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| 136 | * except the last element of the name. |
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| 137 | */ |
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| 138 | public String principal_part() { |
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| 139 | return m_prefix; |
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| 140 | } |
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| 141 | |
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[d69593c] | 142 | public String principal() { return m_parts.length > 0 ? m_parts[0] : null; } |
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| 143 | public String role_name() { return m_parts.length > 1 ? m_parts[1] : null; } |
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| 144 | public String linked_role() { return A_r1(); } |
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[281158a] | 145 | |
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[cac4c76] | 146 | /** |
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| 147 | * Get the roles that form the prerequisites to this intersection. Throws |
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| 148 | * a runtime exception if this is not an intersection role. |
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| 149 | */ |
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[5129e3e] | 150 | Role[] prereqs() throws RuntimeException { |
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[cac4c76] | 151 | if (!is_intersection()) |
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| 152 | throw new RuntimeException("Not an intersection role."); |
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| 153 | |
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| 154 | return m_prereqs; |
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| 155 | } |
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| 156 | |
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[31b67d5] | 157 | public String toString() { |
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| 158 | return m_string; |
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| 159 | } |
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| 160 | |
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[84f0e7a] | 161 | public String simpleString(Context c) { |
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| 162 | return c.expandNickname(m_string); |
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[de63a31] | 163 | } |
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| 164 | |
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[31b67d5] | 165 | public boolean equals(Object v2) { |
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| 166 | if (v2 instanceof Role) |
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| 167 | return m_string.equals(((Role)v2).m_string); |
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| 168 | return false; |
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| 169 | } |
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| 170 | |
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[88e139a] | 171 | public int compareTo(Object o) { |
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| 172 | if (o instanceof Role) |
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| 173 | return m_string.compareTo(((Role)o).m_string); |
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| 174 | else return 1; |
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| 175 | } |
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| 176 | |
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[31b67d5] | 177 | public int hashCode() { |
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| 178 | return m_string.hashCode(); |
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| 179 | } |
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[de63a31] | 180 | |
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[31b67d5] | 181 | } |
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