context.h 3.1 KB

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  1. /*
  2. * A security context is a set of security attributes
  3. * associated with each subject and object controlled
  4. * by the security policy. Security contexts are
  5. * externally represented as variable-length strings
  6. * that can be interpreted by a user or application
  7. * with an understanding of the security policy.
  8. * Internally, the security server uses a simple
  9. * structure. This structure is private to the
  10. * security server and can be changed without affecting
  11. * clients of the security server.
  12. *
  13. * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
  14. */
  15. #ifndef _SS_CONTEXT_H_
  16. #define _SS_CONTEXT_H_
  17. #include "ebitmap.h"
  18. #include "mls_types.h"
  19. #include "security.h"
  20. /*
  21. * A security context consists of an authenticated user
  22. * identity, a role, a type and a MLS range.
  23. */
  24. struct context {
  25. u32 user;
  26. u32 role;
  27. u32 type;
  28. struct mls_range range;
  29. };
  30. static inline void mls_context_init(struct context *c)
  31. {
  32. memset(&c->range, 0, sizeof(c->range));
  33. }
  34. static inline int mls_context_cpy(struct context *dst, struct context *src)
  35. {
  36. int rc;
  37. if (!selinux_mls_enabled)
  38. return 0;
  39. dst->range.level[0].sens = src->range.level[0].sens;
  40. rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[0].cat);
  41. if (rc)
  42. goto out;
  43. dst->range.level[1].sens = src->range.level[1].sens;
  44. rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[1].cat);
  45. if (rc)
  46. ebitmap_destroy(&dst->range.level[0].cat);
  47. out:
  48. return rc;
  49. }
  50. /*
  51. * Sets both levels in the MLS range of 'dst' to the low level of 'src'.
  52. */
  53. static inline int mls_context_cpy_low(struct context *dst, struct context *src)
  54. {
  55. int rc;
  56. if (!selinux_mls_enabled)
  57. return 0;
  58. dst->range.level[0].sens = src->range.level[0].sens;
  59. rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[0].cat);
  60. if (rc)
  61. goto out;
  62. dst->range.level[1].sens = src->range.level[0].sens;
  63. rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[0].cat);
  64. if (rc)
  65. ebitmap_destroy(&dst->range.level[0].cat);
  66. out:
  67. return rc;
  68. }
  69. static inline int mls_context_cmp(struct context *c1, struct context *c2)
  70. {
  71. if (!selinux_mls_enabled)
  72. return 1;
  73. return ((c1->range.level[0].sens == c2->range.level[0].sens) &&
  74. ebitmap_cmp(&c1->range.level[0].cat,&c2->range.level[0].cat) &&
  75. (c1->range.level[1].sens == c2->range.level[1].sens) &&
  76. ebitmap_cmp(&c1->range.level[1].cat,&c2->range.level[1].cat));
  77. }
  78. static inline void mls_context_destroy(struct context *c)
  79. {
  80. if (!selinux_mls_enabled)
  81. return;
  82. ebitmap_destroy(&c->range.level[0].cat);
  83. ebitmap_destroy(&c->range.level[1].cat);
  84. mls_context_init(c);
  85. }
  86. static inline void context_init(struct context *c)
  87. {
  88. memset(c, 0, sizeof(*c));
  89. }
  90. static inline int context_cpy(struct context *dst, struct context *src)
  91. {
  92. dst->user = src->user;
  93. dst->role = src->role;
  94. dst->type = src->type;
  95. return mls_context_cpy(dst, src);
  96. }
  97. static inline void context_destroy(struct context *c)
  98. {
  99. c->user = c->role = c->type = 0;
  100. mls_context_destroy(c);
  101. }
  102. static inline int context_cmp(struct context *c1, struct context *c2)
  103. {
  104. return ((c1->user == c2->user) &&
  105. (c1->role == c2->role) &&
  106. (c1->type == c2->type) &&
  107. mls_context_cmp(c1, c2));
  108. }
  109. #endif /* _SS_CONTEXT_H_ */