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[[!toc levels=3]]
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[[_TOC_]]
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# Big picture
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# Big picture
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This is about [[!tails_ticket 5462]].
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This is about tails/tails#5462.
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There are a few good reasons for making Tor's data directory
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There are a few good reasons for making Tor's data directory
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persistent:
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persistent:
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... | @@ -29,8 +31,8 @@ a persistence preset for it. |
... | @@ -29,8 +31,8 @@ a persistence preset for it. |
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* Using persistent Entry Guard(s) [is a problem for mobile
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* Using persistent Entry Guard(s) [is a problem for mobile
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users](https://lists.torproject.org/pipermail/tor-talk/2012-October/025975.html),
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users](https://lists.torproject.org/pipermail/tor-talk/2012-October/025975.html),
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as it gives attackers some bits for AdvGoalTracking (see [[the MAC
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as it gives attackers some bits for AdvGoalTracking (see [the MAC
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address spoofing design documentation|contribute/design/MAC_address]]),
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address spoofing design documentation](https://tails.boum.org/contribute/design/MAC_address)),
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even if this is less severe than it used to be, thanks
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even if this is less severe than it used to be, thanks
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to the move to a single Entry Guard. We want to protect users
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to the move to a single Entry Guard. We want to protect users
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against AdvGoalTracking, including versions thereof where the
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against AdvGoalTracking, including versions thereof where the
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... | @@ -372,7 +374,7 @@ Prerequisites: this can happen only once we don't rely anymore on the |
... | @@ -372,7 +374,7 @@ Prerequisites: this can happen only once we don't rely anymore on the |
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fact that certain files in `/var/lib/tor` are not persistent.
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fact that certain files in `/var/lib/tor` are not persistent.
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More specifically:
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More specifically:
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* [[!tails_ticket 5774]] needs to be resolved (our time syncing script
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* tails/tails#5774 needs to be resolved (our time syncing script
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uses the existence of `cached-descriptors` as a test for whether Tor
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uses the existence of `cached-descriptors` as a test for whether Tor
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is working, and a similar assumption is made for the
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is working, and a similar assumption is made for the
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`*-consensus` files;
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`*-consensus` files;
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... | @@ -439,7 +441,7 @@ Finally, we seed the Tor PRNG with: |
... | @@ -439,7 +441,7 @@ Finally, we seed the Tor PRNG with: |
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Note that Entry Guard(s) selection depends on the current state of the
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Note that Entry Guard(s) selection depends on the current state of the
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Tor network, and not only on how the Tor PRNG has been seeded.
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Tor network, and not only on how the Tor PRNG has been seeded.
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See [[!tor_bug 2653]] for further ideas on this topic.
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See [bug #2653 on Tor Project's Trac](https://bugs.torproject.org/2653) for further ideas on this topic.
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<a id="drawbacks"></a>
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<a id="drawbacks"></a>
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... | @@ -527,8 +529,7 @@ feature, hence: |
... | @@ -527,8 +529,7 @@ feature, hence: |
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habits now.
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habits now.
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* We have considered requesting user input _once_, both to
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* We have considered requesting user input _once_, both to
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parameterize Entry Guard selection, and for [[!tails_ticket
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parameterize Entry Guard selection, and for seeding the entropy pool (tails/tails#7675). This was discarded since the
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desc="seeding the entropy pool" 7675]]. This was discarded since the
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entropy pool seed should ideally contain, well, quite some entropy,
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entropy pool seed should ideally contain, well, quite some entropy,
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while the requested user input for Entry Guard selection should be
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while the requested user input for Entry Guard selection should be
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short, easy to type and to remember.
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short, easy to type and to remember.
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... | @@ -559,4 +560,5 @@ feature, hence: |
... | @@ -559,4 +560,5 @@ feature, hence: |
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randomly." (source: *Why MAC Address Randomization is not Enough:
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randomly." (source: *Why MAC Address Randomization is not Enough:
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An Analysis of Wi-Fi Network Discovery Mechanisms*)
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An Analysis of Wi-Fi Network Discovery Mechanisms*)
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* How is this impacted by the changes brought by [[!tor_bug 12600]]? |
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* How is this impacted by the changes brought by [bug #12600 on Tor Project's Trac](https://bugs.torproject.org/12600)?
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