Needed to change Firebase Fingerprint

[ChrisAlphabet]

Hi all,

I had to change the Firebase Fingerprint in FirebaseHttpClient.h

Any idea why the fingerprint would have changed overnight?

Cheers

[tomeryehu]

to what you change it ? I have the same problem too

[ChrisAlphabet]

See if you can get the fingerprint from firebase.com. Will check the real value you need when I get home in about 45min

[ChrisAlphabet]

In the file FirebaseHttpClient.h, change

static const char kFirebaseFingerprint[] = "7A 54 06 9B DC 7A 25 B3 86 8D 66 53 48 2C 0B 96 42 C7 B3 0A";

to

static const char kFirebaseFingerprint[] = "9A E1 A3 B7 88 E0 C9 A3 3F 13 72 4E B5 CB C7 27 41 B2 0F 6A";

[tomeryehu]

how did you know where to find the new fingerprint? why it's change? thank you בתאריך 14 בדצמ׳ 2016 12:54,‏ "Chris Kolodziej" <notifications@github.com> כתב:

…

In the file FirebaseHttpClient.h, change static const char kFirebaseFingerprint[] = "7A 54 06 9B DC 7A 25 B3 86 8D 66 53 48 2C 0B 96 42 C7 B3 0A"; to static const char kFirebaseFingerprint[] = "9A E1 A3 B7 88 E0 C9 A3 3F 13 72 4E B5 CB C7 27 41 B2 0F 6A"; — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#236 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AP7yGx6PM7K4HnRUqwOl5SNeAf5dNCOZks5rH8rsgaJpZM4LMe2q> .

[ChrisAlphabet]

No idea why it changed. Firebase updated their SDK, maybe that changed something? Maybe one of the devs know more?

I found the new fingerprint by accident, to be honest. I was on the hunt for a memory leak that is occurring when Firebase pushes fail (story for another thread, probably post in the next few days) and had alot of debug information being dumped to Serial. You can enable this in Arduino IDE using this or in PlatformIO (big fan) by adding some build flags.

I think I used

build_flags = -DDEBUG_ESP_SSL -DDEBUG_ESP_CORE -DDEBUG_TLS_MEM -DDEBUG_LOG_LEVEL=6 

but could have included any of

-DDEBUG_ESP_CORE -DDEBUG_ESP_SSL -DDEBUG_ESP_WIFI -DDEBUG_ESP_HTTP_CLIENT -DDEBUG_ESP_HTTP_UPDATE -DDEBUG_ESP_HTTP_SERVER -DDEBUG_ESP_UPDATER -DDEBUG_ESP_OTA -DDEBUG_TLS_MEM

With those defined I saw a print of the test fingerprint and the real fingerprint which didn't match, seen in the debug snippet below.

cert FP: 9A E1 A3 B7 88 E0 C9 A3 3F 13 72 4E B5 CB C7 27 41 B2 0F 6A 
test FP: 7A 54 06 9B DC 7A 25 B3 86 8D 66 53 48 2C 0B 96 42 C7 B3 0A 
fingerprint doesn't match

Did changing the fingerprint work for you?

[tomeryehu]

In the serial its throw Exception (29):
epc1=0x4000e1b2 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000004 depc=0x00000000

After i change to the new fingerprint its work !!!!!!!!!!!

Thank You !

[Jozarco]

Also work for me. Thanks

[jtwalters]

This probably means their SSL certificate was updated. Seems a bit odd to me that fingerprints are stored in code. I've seen it in other arduino code examples.

[ed7coyne]

It was the only thing the ESP8266 https library supported when this was written. Looks like that was fixed back in august though (esp8266/Arduino@b412660) so if I am understanding it correctly we could (and should) update to be more resilient using a CA root cert.

[lenguyenvu007]

Last night Firebase Fingerprint was changed again, crazy !
from old: "9A E1 A3 B7 88 E0 C9 A3 3F 13 72 4E B5 CB C7 27 41 B2 0F 6A"
to new: "B8 4F 40 70 0C 63 90 E0 07 E8 7D BD B4 11 D0 4A EA 9C 90 F6"

@proppy Can we change the lib FirebaseHttpClient can detect the Firebase Fingerprint automatically?

[willkazan]

Same issue. Last night my ESP8266 stopped to update on Firebase.
@lenguyenvu007 thanks for the new Fingerprint. Its working again.